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1 /*! Javascript plotting library for jQuery, v. 0.7.
2 *
3 * Released under the MIT license by IOLA, December 2007.
4 *
5 */
7 // first an inline dependency, jquery.colorhelpers.js, we inline it here
8 // for convenience
10 /* Plugin for jQuery for working with colors.
11 *
12 * Version 1.1.
13 *
14 * Inspiration from jQuery color animation plugin by John Resig.
15 *
16 * Released under the MIT license by Ole Laursen, October 2009.
17 *
18 * Examples:
19 *
20 * $.color.parse("#fff").scale('rgb', 0.25).add('a', -0.5).toString()
21 * var c = $.color.extract($("#mydiv"), 'background-color');
22 * console.log(c.r, c.g, c.b, c.a);
23 * $.color.make(100, 50, 25, 0.4).toString() // returns "rgba(100,50,25,0.4)"
24 *
25 * Note that .scale() and .add() return the same modified object
26 * instead of making a new one.
27 *
28 * V. 1.1: Fix error handling so e.g. parsing an empty string does
29 * produce a color rather than just crashing.
30 */
31 (function(B){B.color={};B.color.make=function(F,E,C,D){var G={};G.r=F||0;G.g=E||0;G.b=C||0;G.a=D!=null?D:1;G.add=function(J,I){for(var H=0;H<J.length;++H){G[J.charAt(H)]+=I}return G.normalize()};G.scale=function(J,I){for(var H=0;H<J.length;++H){G[J.charAt(H)]*=I}return G.normalize()};G.toString=function(){if(G.a>=1){return"rgb("+[G.r,G.g,G.b].join(",")+")"}else{return"rgba("+[G.r,G.g,G.b,G.a].join(",")+")"}};G.normalize=function(){function H(J,K,I){return K<J?J:(K>I?I:K)}G.r=H(0,parseInt(G.r),255);G.g=H(0,parseInt(G.g),255);G.b=H(0,parseInt(G.b),255);G.a=H(0,G.a,1);return G};G.clone=function(){return B.color.make(G.r,G.b,G.g,G.a)};return G.normalize()};B.color.extract=function(D,C){var E;do{E=D.css(C).toLowerCase();if(E!=""&&E!="transparent"){break}D=D.parent()}while(!B.nodeName(D.get(0),"body"));if(E=="rgba(0, 0, 0, 0)"){E="transparent"}return B.color.parse(E)};B.color.parse=function(F){var E,C=B.color.make;if(E=/rgb\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*\)/.exec(F)){return C(parseInt(E[1],10),parseInt(E[2],10),parseInt(E[3],10))}if(E=/rgba\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]+(?:\.[0-9]+)?)\s*\)/.exec(F)){return C(parseInt(E[1],10),parseInt(E[2],10),parseInt(E[3],10),parseFloat(E[4]))}if(E=/rgb\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*\)/.exec(F)){return C(parseFloat(E[1])*2.55,parseFloat(E[2])*2.55,parseFloat(E[3])*2.55)}if(E=/rgba\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\s*\)/.exec(F)){return C(parseFloat(E[1])*2.55,parseFloat(E[2])*2.55,parseFloat(E[3])*2.55,parseFloat(E[4]))}if(E=/#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})/.exec(F)){return C(parseInt(E[1],16),parseInt(E[2],16),parseInt(E[3],16))}if(E=/#([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])/.exec(F)){return C(parseInt(E[1]+E[1],16),parseInt(E[2]+E[2],16),parseInt(E[3]+E[3],16))}var D=B.trim(F).toLowerCase();if(D=="transparent"){return C(255,255,255,0)}else{E=A[D]||[0,0,0];return C(E[0],E[1],E[2])}};var A={aqua:[0,255,255],azure:[240,255,255],beige:[245,245,220],black:[0,0,0],blue:[0,0,255],brown:[165,42,42],cyan:[0,255,255],darkblue:[0,0,139],darkcyan:[0,139,139],darkgrey:[169,169,169],darkgreen:[0,100,0],darkkhaki:[189,183,107],darkmagenta:[139,0,139],darkolivegreen:[85,107,47],darkorange:[255,140,0],darkorchid:[153,50,204],darkred:[139,0,0],darksalmon:[233,150,122],darkviolet:[148,0,211],fuchsia:[255,0,255],gold:[255,215,0],green:[0,128,0],indigo:[75,0,130],khaki:[240,230,140],lightblue:[173,216,230],lightcyan:[224,255,255],lightgreen:[144,238,144],lightgrey:[211,211,211],lightpink:[255,182,193],lightyellow:[255,255,224],lime:[0,255,0],magenta:[255,0,255],maroon:[128,0,0],navy:[0,0,128],olive:[128,128,0],orange:[255,165,0],pink:[255,192,203],purple:[128,0,128],violet:[128,0,128],red:[255,0,0],silver:[192,192,192],white:[255,255,255],yellow:[255,255,0]}})(jQuery);
33 // the actual Flot code
34 (function($) {
35 function Plot(placeholder, data_, options_, plugins) {
36 // data is on the form:
37 // [ series1, series2 ... ]
38 // where series is either just the data as [ [x1, y1], [x2, y2], ... ]
39 // or { data: [ [x1, y1], [x2, y2], ... ], label: "some label", ... }
41 var series = [],
42 options = {
43 // the color theme used for graphs
44 colors: ["#edc240", "#afd8f8", "#cb4b4b", "#4da74d", "#9440ed"],
45 legend: {
46 show: true,
47 noColumns: 1, // number of colums in legend table
48 labelFormatter: null, // fn: string -> string
49 labelBoxBorderColor: "#ccc", // border color for the little label boxes
50 container: null, // container (as jQuery object) to put legend in, null means default on top of graph
51 position: "ne", // position of default legend container within plot
52 margin: 5, // distance from grid edge to default legend container within plot
53 backgroundColor: null, // null means auto-detect
54 backgroundOpacity: 0.85 // set to 0 to avoid background
55 },
56 xaxis: {
57 show: null, // null = auto-detect, true = always, false = never
58 position: "bottom", // or "top"
59 mode: null, // null or "time"
60 color: null, // base color, labels, ticks
61 tickColor: null, // possibly different color of ticks, e.g. "rgba(0,0,0,0.15)"
62 transform: null, // null or f: number -> number to transform axis
63 inverseTransform: null, // if transform is set, this should be the inverse function
64 min: null, // min. value to show, null means set automatically
65 max: null, // max. value to show, null means set automatically
66 autoscaleMargin: null, // margin in % to add if auto-setting min/max
67 ticks: null, // either [1, 3] or [[1, "a"], 3] or (fn: axis info -> ticks) or app. number of ticks for auto-ticks
68 tickFormatter: null, // fn: number -> string
69 labelWidth: null, // size of tick labels in pixels
70 labelHeight: null,
71 reserveSpace: null, // whether to reserve space even if axis isn't shown
72 tickLength: null, // size in pixels of ticks, or "full" for whole line
73 alignTicksWithAxis: null, // axis number or null for no sync
75 // mode specific options
76 tickDecimals: null, // no. of decimals, null means auto
77 tickSize: null, // number or [number, "unit"]
78 minTickSize: null, // number or [number, "unit"]
79 monthNames: null, // list of names of months
80 timeformat: null, // format string to use
81 twelveHourClock: false // 12 or 24 time in time mode
82 },
83 yaxis: {
84 autoscaleMargin: 0.02,
85 position: "left" // or "right"
86 },
87 xaxes: [],
88 yaxes: [],
89 series: {
90 points: {
91 show: false,
92 radius: 3,
93 lineWidth: 2, // in pixels
94 fill: true,
95 fillColor: "#ffffff",
96 symbol: "circle" // or callback
97 },
98 lines: {
99 // we don't put in show: false so we can see
100 // whether lines were actively disabled
101 lineWidth: 2, // in pixels
102 fill: false,
103 fillColor: null,
104 steps: false
105 },
106 bars: {
107 show: false,
108 lineWidth: 2, // in pixels
109 barWidth: 1, // in units of the x axis
110 fill: true,
111 fillColor: null,
112 align: "left", // or "center"
113 horizontal: false
114 },
115 shadowSize: 3
116 },
117 grid: {
118 show: true,
119 aboveData: false,
120 color: "#545454", // primary color used for outline and labels
121 backgroundColor: null, // null for transparent, else color
122 borderColor: null, // set if different from the grid color
123 tickColor: null, // color for the ticks, e.g. "rgba(0,0,0,0.15)"
124 labelMargin: 5, // in pixels
125 axisMargin: 8, // in pixels
126 borderWidth: 2, // in pixels
127 minBorderMargin: null, // in pixels, null means taken from points radius
128 markings: null, // array of ranges or fn: axes -> array of ranges
129 markingsColor: "#f4f4f4",
130 markingsLineWidth: 2,
131 // interactive stuff
132 clickable: false,
133 hoverable: false,
134 autoHighlight: true, // highlight in case mouse is near
135 mouseActiveRadius: 10 // how far the mouse can be away to activate an item
136 },
137 hooks: {}
138 },
139 canvas = null, // the canvas for the plot itself
140 overlay = null, // canvas for interactive stuff on top of plot
141 eventHolder = null, // jQuery object that events should be bound to
142 ctx = null, octx = null,
143 xaxes = [], yaxes = [],
144 plotOffset = { left: 0, right: 0, top: 0, bottom: 0},
145 canvasWidth = 0, canvasHeight = 0,
146 plotWidth = 0, plotHeight = 0,
147 hooks = {
148 processOptions: [],
149 processRawData: [],
150 processDatapoints: [],
151 drawSeries: [],
152 draw: [],
153 bindEvents: [],
154 drawOverlay: [],
155 shutdown: []
156 },
157 plot = this;
159 // public functions
160 plot.setData = setData;
161 plot.setupGrid = setupGrid;
162 plot.draw = draw;
163 plot.getPlaceholder = function() { return placeholder; };
164 plot.getCanvas = function() { return canvas; };
165 plot.getPlotOffset = function() { return plotOffset; };
166 plot.width = function () { return plotWidth; };
167 plot.height = function () { return plotHeight; };
168 plot.offset = function () {
169 var o = eventHolder.offset();
170 o.left += plotOffset.left;
171 o.top += plotOffset.top;
172 return o;
173 };
174 plot.getData = function () { return series; };
175 plot.getAxes = function () {
176 var res = {}, i;
177 $.each(xaxes.concat(yaxes), function (_, axis) {
178 if (axis)
179 res[axis.direction + (axis.n != 1 ? axis.n : "") + "axis"] = axis;
180 });
181 return res;
182 };
183 plot.getXAxes = function () { return xaxes; };
184 plot.getYAxes = function () { return yaxes; };
185 plot.c2p = canvasToAxisCoords;
186 plot.p2c = axisToCanvasCoords;
187 plot.getOptions = function () { return options; };
188 plot.highlight = highlight;
189 plot.unhighlight = unhighlight;
190 plot.triggerRedrawOverlay = triggerRedrawOverlay;
191 plot.pointOffset = function(point) {
192 return {
193 left: parseInt(xaxes[axisNumber(point, "x") - 1].p2c(+point.x) + plotOffset.left),
194 top: parseInt(yaxes[axisNumber(point, "y") - 1].p2c(+point.y) + plotOffset.top)
195 };
196 };
197 plot.shutdown = shutdown;
198 plot.resize = function () {
199 getCanvasDimensions();
200 resizeCanvas(canvas);
201 resizeCanvas(overlay);
202 };
204 // public attributes
205 plot.hooks = hooks;
207 // initialize
208 initPlugins(plot);
209 parseOptions(options_);
210 setupCanvases();
211 setData(data_);
212 setupGrid();
213 draw();
214 bindEvents();
217 function executeHooks(hook, args) {
218 args = [plot].concat(args);
219 for (var i = 0; i < hook.length; ++i)
220 hook[i].apply(this, args);
221 }
223 function initPlugins() {
224 for (var i = 0; i < plugins.length; ++i) {
225 var p = plugins[i];
226 p.init(plot);
227 if (p.options)
228 $.extend(true, options, p.options);
229 }
230 }
232 function parseOptions(opts) {
233 var i;
235 $.extend(true, options, opts);
237 if (options.xaxis.color == null)
238 options.xaxis.color = options.grid.color;
239 if (options.yaxis.color == null)
240 options.yaxis.color = options.grid.color;
242 if (options.xaxis.tickColor == null) // backwards-compatibility
243 options.xaxis.tickColor = options.grid.tickColor;
244 if (options.yaxis.tickColor == null) // backwards-compatibility
245 options.yaxis.tickColor = options.grid.tickColor;
247 if (options.grid.borderColor == null)
248 options.grid.borderColor = options.grid.color;
249 if (options.grid.tickColor == null)
250 options.grid.tickColor = $.color.parse(options.grid.color).scale('a', 0.22).toString();
252 // fill in defaults in axes, copy at least always the
253 // first as the rest of the code assumes it'll be there
254 for (i = 0; i < Math.max(1, options.xaxes.length); ++i)
255 options.xaxes[i] = $.extend(true, {}, options.xaxis, options.xaxes[i]);
256 for (i = 0; i < Math.max(1, options.yaxes.length); ++i)
257 options.yaxes[i] = $.extend(true, {}, options.yaxis, options.yaxes[i]);
259 // backwards compatibility, to be removed in future
260 if (options.xaxis.noTicks && options.xaxis.ticks == null)
261 options.xaxis.ticks = options.xaxis.noTicks;
262 if (options.yaxis.noTicks && options.yaxis.ticks == null)
263 options.yaxis.ticks = options.yaxis.noTicks;
264 if (options.x2axis) {
265 options.xaxes[1] = $.extend(true, {}, options.xaxis, options.x2axis);
266 options.xaxes[1].position = "top";
267 }
268 if (options.y2axis) {
269 options.yaxes[1] = $.extend(true, {}, options.yaxis, options.y2axis);
270 options.yaxes[1].position = "right";
271 }
272 if (options.grid.coloredAreas)
273 options.grid.markings = options.grid.coloredAreas;
274 if (options.grid.coloredAreasColor)
275 options.grid.markingsColor = options.grid.coloredAreasColor;
276 if (options.lines)
277 $.extend(true, options.series.lines, options.lines);
278 if (options.points)
279 $.extend(true, options.series.points, options.points);
280 if (options.bars)
281 $.extend(true, options.series.bars, options.bars);
282 if (options.shadowSize != null)
283 options.series.shadowSize = options.shadowSize;
285 // save options on axes for future reference
286 for (i = 0; i < options.xaxes.length; ++i)
287 getOrCreateAxis(xaxes, i + 1).options = options.xaxes[i];
288 for (i = 0; i < options.yaxes.length; ++i)
289 getOrCreateAxis(yaxes, i + 1).options = options.yaxes[i];
291 // add hooks from options
292 for (var n in hooks)
293 if (options.hooks[n] && options.hooks[n].length)
294 hooks[n] = hooks[n].concat(options.hooks[n]);
296 executeHooks(hooks.processOptions, [options]);
297 }
299 function setData(d) {
300 series = parseData(d);
301 fillInSeriesOptions();
302 processData();
303 }
305 function parseData(d) {
306 var res = [];
307 for (var i = 0; i < d.length; ++i) {
308 var s = $.extend(true, {}, options.series);
310 if (d[i].data != null) {
311 s.data = d[i].data; // move the data instead of deep-copy
312 delete d[i].data;
314 $.extend(true, s, d[i]);
316 d[i].data = s.data;
317 }
318 else
319 s.data = d[i];
320 res.push(s);
321 }
323 return res;
324 }
326 function axisNumber(obj, coord) {
327 var a = obj[coord + "axis"];
328 if (typeof a == "object") // if we got a real axis, extract number
329 a = a.n;
330 if (typeof a != "number")
331 a = 1; // default to first axis
332 return a;
333 }
335 function allAxes() {
336 // return flat array without annoying null entries
337 return $.grep(xaxes.concat(yaxes), function (a) { return a; });
338 }
340 function canvasToAxisCoords(pos) {
341 // return an object with x/y corresponding to all used axes
342 var res = {}, i, axis;
343 for (i = 0; i < xaxes.length; ++i) {
344 axis = xaxes[i];
345 if (axis && axis.used)
346 res["x" + axis.n] = axis.c2p(pos.left);
347 }
349 for (i = 0; i < yaxes.length; ++i) {
350 axis = yaxes[i];
351 if (axis && axis.used)
352 res["y" + axis.n] = axis.c2p(pos.top);
353 }
355 if (res.x1 !== undefined)
356 res.x = res.x1;
357 if (res.y1 !== undefined)
358 res.y = res.y1;
360 return res;
361 }
363 function axisToCanvasCoords(pos) {
364 // get canvas coords from the first pair of x/y found in pos
365 var res = {}, i, axis, key;
367 for (i = 0; i < xaxes.length; ++i) {
368 axis = xaxes[i];
369 if (axis && axis.used) {
370 key = "x" + axis.n;
371 if (pos[key] == null && axis.n == 1)
372 key = "x";
374 if (pos[key] != null) {
375 res.left = axis.p2c(pos[key]);
376 break;
377 }
378 }
379 }
381 for (i = 0; i < yaxes.length; ++i) {
382 axis = yaxes[i];
383 if (axis && axis.used) {
384 key = "y" + axis.n;
385 if (pos[key] == null && axis.n == 1)
386 key = "y";
388 if (pos[key] != null) {
389 res.top = axis.p2c(pos[key]);
390 break;
391 }
392 }
393 }
395 return res;
396 }
398 function getOrCreateAxis(axes, number) {
399 if (!axes[number - 1])
400 axes[number - 1] = {
401 n: number, // save the number for future reference
402 direction: axes == xaxes ? "x" : "y",
403 options: $.extend(true, {}, axes == xaxes ? options.xaxis : options.yaxis)
404 };
406 return axes[number - 1];
407 }
409 function fillInSeriesOptions() {
410 var i;
412 // collect what we already got of colors
413 var neededColors = series.length,
414 usedColors = [],
415 assignedColors = [];
416 for (i = 0; i < series.length; ++i) {
417 var sc = series[i].color;
418 if (sc != null) {
419 --neededColors;
420 if (typeof sc == "number")
421 assignedColors.push(sc);
422 else
423 usedColors.push($.color.parse(series[i].color));
424 }
425 }
427 // we might need to generate more colors if higher indices
428 // are assigned
429 for (i = 0; i < assignedColors.length; ++i) {
430 neededColors = Math.max(neededColors, assignedColors[i] + 1);
431 }
433 // produce colors as needed
434 var colors = [], variation = 0;
435 i = 0;
436 while (colors.length < neededColors) {
437 var c;
438 if (options.colors.length == i) // check degenerate case
439 c = $.color.make(100, 100, 100);
440 else
441 c = $.color.parse(options.colors[i]);
443 // vary color if needed
444 var sign = variation % 2 == 1 ? -1 : 1;
445 c.scale('rgb', 1 + sign * Math.ceil(variation / 2) * 0.2)
447 // FIXME: if we're getting to close to something else,
448 // we should probably skip this one
449 colors.push(c);
451 ++i;
452 if (i >= options.colors.length) {
453 i = 0;
454 ++variation;
455 }
456 }
458 // fill in the options
459 var colori = 0, s;
460 for (i = 0; i < series.length; ++i) {
461 s = series[i];
463 // assign colors
464 if (s.color == null) {
465 s.color = colors[colori].toString();
466 ++colori;
467 }
468 else if (typeof s.color == "number")
469 s.color = colors[s.color].toString();
471 // turn on lines automatically in case nothing is set
472 if (s.lines.show == null) {
473 var v, show = true;
474 for (v in s)
475 if (s[v] && s[v].show) {
476 show = false;
477 break;
478 }
479 if (show)
480 s.lines.show = true;
481 }
483 // setup axes
484 s.xaxis = getOrCreateAxis(xaxes, axisNumber(s, "x"));
485 s.yaxis = getOrCreateAxis(yaxes, axisNumber(s, "y"));
486 }
487 }
489 function processData() {
490 var topSentry = Number.POSITIVE_INFINITY,
491 bottomSentry = Number.NEGATIVE_INFINITY,
492 fakeInfinity = Number.MAX_VALUE,
493 i, j, k, m, length,
494 s, points, ps, x, y, axis, val, f, p;
496 function updateAxis(axis, min, max) {
497 if (min < axis.datamin && min != -fakeInfinity)
498 axis.datamin = min;
499 if (max > axis.datamax && max != fakeInfinity)
500 axis.datamax = max;
501 }
503 $.each(allAxes(), function (_, axis) {
504 // init axis
505 axis.datamin = topSentry;
506 axis.datamax = bottomSentry;
507 axis.used = false;
508 });
510 for (i = 0; i < series.length; ++i) {
511 s = series[i];
512 s.datapoints = { points: [] };
514 executeHooks(hooks.processRawData, [ s, s.data, s.datapoints ]);
515 }
517 // first pass: clean and copy data
518 for (i = 0; i < series.length; ++i) {
519 s = series[i];
521 var data = s.data, format = s.datapoints.format;
523 if (!format) {
524 format = [];
525 // find out how to copy
526 format.push({ x: true, number: true, required: true });
527 format.push({ y: true, number: true, required: true });
529 if (s.bars.show || (s.lines.show && s.lines.fill)) {
530 format.push({ y: true, number: true, required: false, defaultValue: 0 });
531 if (s.bars.horizontal) {
532 delete format[format.length - 1].y;
533 format[format.length - 1].x = true;
534 }
535 }
537 s.datapoints.format = format;
538 }
540 if (s.datapoints.pointsize != null)
541 continue; // already filled in
543 s.datapoints.pointsize = format.length;
545 ps = s.datapoints.pointsize;
546 points = s.datapoints.points;
548 insertSteps = s.lines.show && s.lines.steps;
549 s.xaxis.used = s.yaxis.used = true;
551 for (j = k = 0; j < data.length; ++j, k += ps) {
552 p = data[j];
554 var nullify = p == null;
555 if (!nullify) {
556 for (m = 0; m < ps; ++m) {
557 val = p[m];
558 f = format[m];
560 if (f) {
561 if (f.number && val != null) {
562 val = +val; // convert to number
563 if (isNaN(val))
564 val = null;
565 else if (val == Infinity)
566 val = fakeInfinity;
567 else if (val == -Infinity)
568 val = -fakeInfinity;
569 }
571 if (val == null) {
572 if (f.required)
573 nullify = true;
575 if (f.defaultValue != null)
576 val = f.defaultValue;
577 }
578 }
580 points[k + m] = val;
581 }
582 }
584 if (nullify) {
585 for (m = 0; m < ps; ++m) {
586 val = points[k + m];
587 if (val != null) {
588 f = format[m];
589 // extract min/max info
590 if (f.x)
591 updateAxis(s.xaxis, val, val);
592 if (f.y)
593 updateAxis(s.yaxis, val, val);
594 }
595 points[k + m] = null;
596 }
597 }
598 else {
599 // a little bit of line specific stuff that
600 // perhaps shouldn't be here, but lacking
601 // better means...
602 if (insertSteps && k > 0
603 && points[k - ps] != null
604 && points[k - ps] != points[k]
605 && points[k - ps + 1] != points[k + 1]) {
606 // copy the point to make room for a middle point
607 for (m = 0; m < ps; ++m)
608 points[k + ps + m] = points[k + m];
610 // middle point has same y
611 points[k + 1] = points[k - ps + 1];
613 // we've added a point, better reflect that
614 k += ps;
615 }
616 }
617 }
618 }
620 // give the hooks a chance to run
621 for (i = 0; i < series.length; ++i) {
622 s = series[i];
624 executeHooks(hooks.processDatapoints, [ s, s.datapoints]);
625 }
627 // second pass: find datamax/datamin for auto-scaling
628 for (i = 0; i < series.length; ++i) {
629 s = series[i];
630 points = s.datapoints.points,
631 ps = s.datapoints.pointsize;
633 var xmin = topSentry, ymin = topSentry,
634 xmax = bottomSentry, ymax = bottomSentry;
636 for (j = 0; j < points.length; j += ps) {
637 if (points[j] == null)
638 continue;
640 for (m = 0; m < ps; ++m) {
641 val = points[j + m];
642 f = format[m];
643 if (!f || val == fakeInfinity || val == -fakeInfinity)
644 continue;
646 if (f.x) {
647 if (val < xmin)
648 xmin = val;
649 if (val > xmax)
650 xmax = val;
651 }
652 if (f.y) {
653 if (val < ymin)
654 ymin = val;
655 if (val > ymax)
656 ymax = val;
657 }
658 }
659 }
661 if (s.bars.show) {
662 // make sure we got room for the bar on the dancing floor
663 var delta = s.bars.align == "left" ? 0 : -s.bars.barWidth/2;
664 if (s.bars.horizontal) {
665 ymin += delta;
666 ymax += delta + s.bars.barWidth;
667 }
668 else {
669 xmin += delta;
670 xmax += delta + s.bars.barWidth;
671 }
672 }
674 updateAxis(s.xaxis, xmin, xmax);
675 updateAxis(s.yaxis, ymin, ymax);
676 }
678 $.each(allAxes(), function (_, axis) {
679 if (axis.datamin == topSentry)
680 axis.datamin = null;
681 if (axis.datamax == bottomSentry)
682 axis.datamax = null;
683 });
684 }
686 function makeCanvas(skipPositioning, cls) {
687 var c = document.createElement('canvas');
688 c.className = cls;
689 c.width = canvasWidth;
690 c.height = canvasHeight;
692 if (!skipPositioning)
693 $(c).css({ position: 'absolute', left: 0, top: 0 });
695 $(c).appendTo(placeholder);
697 if (!c.getContext) // excanvas hack
698 c = window.G_vmlCanvasManager.initElement(c);
700 // used for resetting in case we get replotted
701 c.getContext("2d").save();
703 return c;
704 }
706 function getCanvasDimensions() {
707 canvasWidth = placeholder.width();
708 canvasHeight = placeholder.height();
710 if (canvasWidth <= 0 || canvasHeight <= 0)
711 throw "Invalid dimensions for plot, width = " + canvasWidth + ", height = " + canvasHeight;
712 }
714 function resizeCanvas(c) {
715 // resizing should reset the state (excanvas seems to be
716 // buggy though)
717 if (c.width != canvasWidth)
718 c.width = canvasWidth;
720 if (c.height != canvasHeight)
721 c.height = canvasHeight;
723 // so try to get back to the initial state (even if it's
724 // gone now, this should be safe according to the spec)
725 var cctx = c.getContext("2d");
726 cctx.restore();
728 // and save again
729 cctx.save();
730 }
732 function setupCanvases() {
733 var reused,
734 existingCanvas = placeholder.children("canvas.base"),
735 existingOverlay = placeholder.children("canvas.overlay");
737 if (existingCanvas.length == 0 || existingOverlay == 0) {
738 // init everything
740 placeholder.html(""); // make sure placeholder is clear
742 placeholder.css({ padding: 0 }); // padding messes up the positioning
744 if (placeholder.css("position") == 'static')
745 placeholder.css("position", "relative"); // for positioning labels and overlay
747 getCanvasDimensions();
749 canvas = makeCanvas(true, "base");
750 overlay = makeCanvas(false, "overlay"); // overlay canvas for interactive features
752 reused = false;
753 }
754 else {
755 // reuse existing elements
757 canvas = existingCanvas.get(0);
758 overlay = existingOverlay.get(0);
760 reused = true;
761 }
763 ctx = canvas.getContext("2d");
764 octx = overlay.getContext("2d");
766 // we include the canvas in the event holder too, because IE 7
767 // sometimes has trouble with the stacking order
768 eventHolder = $([overlay, canvas]);
770 if (reused) {
771 // run shutdown in the old plot object
772 placeholder.data("plot").shutdown();
774 // reset reused canvases
775 plot.resize();
777 // make sure overlay pixels are cleared (canvas is cleared when we redraw)
778 octx.clearRect(0, 0, canvasWidth, canvasHeight);
780 // then whack any remaining obvious garbage left
781 eventHolder.unbind();
782 placeholder.children().not([canvas, overlay]).remove();
783 }
785 // save in case we get replotted
786 placeholder.data("plot", plot);
787 }
789 function bindEvents() {
790 // bind events
791 if (options.grid.hoverable) {
792 eventHolder.mousemove(onMouseMove);
793 eventHolder.mouseleave(onMouseLeave);
794 }
796 if (options.grid.clickable)
797 eventHolder.click(onClick);
799 executeHooks(hooks.bindEvents, [eventHolder]);
800 }
802 function shutdown() {
803 if (redrawTimeout)
804 clearTimeout(redrawTimeout);
806 eventHolder.unbind("mousemove", onMouseMove);
807 eventHolder.unbind("mouseleave", onMouseLeave);
808 eventHolder.unbind("click", onClick);
810 executeHooks(hooks.shutdown, [eventHolder]);
811 }
813 function setTransformationHelpers(axis) {
814 // set helper functions on the axis, assumes plot area
815 // has been computed already
817 function identity(x) { return x; }
819 var s, m, t = axis.options.transform || identity,
820 it = axis.options.inverseTransform;
822 // precompute how much the axis is scaling a point
823 // in canvas space
824 if (axis.direction == "x") {
825 s = axis.scale = plotWidth / Math.abs(t(axis.max) - t(axis.min));
826 m = Math.min(t(axis.max), t(axis.min));
827 }
828 else {
829 s = axis.scale = plotHeight / Math.abs(t(axis.max) - t(axis.min));
830 s = -s;
831 m = Math.max(t(axis.max), t(axis.min));
832 }
834 // data point to canvas coordinate
835 if (t == identity) // slight optimization
836 axis.p2c = function (p) { return (p - m) * s; };
837 else
838 axis.p2c = function (p) { return (t(p) - m) * s; };
839 // canvas coordinate to data point
840 if (!it)
841 axis.c2p = function (c) { return m + c / s; };
842 else
843 axis.c2p = function (c) { return it(m + c / s); };
844 }
846 function measureTickLabels(axis) {
847 var opts = axis.options, i, ticks = axis.ticks || [], labels = [],
848 l, w = opts.labelWidth, h = opts.labelHeight, dummyDiv;
850 function makeDummyDiv(labels, width) {
851 return $('<div style="position:absolute;top:-10000px;' + width + 'font-size:smaller">' +
852 '<div class="' + axis.direction + 'Axis ' + axis.direction + axis.n + 'Axis">'
853 + labels.join("") + '</div></div>')
854 .appendTo(placeholder);
855 }
857 if (axis.direction == "x") {
858 // to avoid measuring the widths of the labels (it's slow), we
859 // construct fixed-size boxes and put the labels inside
860 // them, we don't need the exact figures and the
861 // fixed-size box content is easy to center
862 if (w == null)
863 w = Math.floor(canvasWidth / (ticks.length > 0 ? ticks.length : 1));
865 // measure x label heights
866 if (h == null) {
867 labels = [];
868 for (i = 0; i < ticks.length; ++i) {
869 l = ticks[i].label;
870 if (l)
871 labels.push('<div class="tickLabel" style="float:left;width:' + w + 'px">' + l + '</div>');
872 }
874 if (labels.length > 0) {
875 // stick them all in the same div and measure
876 // collective height
877 labels.push('<div style="clear:left"></div>');
878 dummyDiv = makeDummyDiv(labels, "width:10000px;");
879 h = dummyDiv.height();
880 dummyDiv.remove();
881 }
882 }
883 }
884 else if (w == null || h == null) {
885 // calculate y label dimensions
886 for (i = 0; i < ticks.length; ++i) {
887 l = ticks[i].label;
888 if (l)
889 labels.push('<div class="tickLabel">' + l + '</div>');
890 }
892 if (labels.length > 0) {
893 dummyDiv = makeDummyDiv(labels, "");
894 if (w == null)
895 w = dummyDiv.children().width();
896 if (h == null)
897 h = dummyDiv.find("div.tickLabel").height();
898 dummyDiv.remove();
899 }
900 }
902 if (w == null)
903 w = 0;
904 if (h == null)
905 h = 0;
907 axis.labelWidth = w;
908 axis.labelHeight = h;
909 }
911 function allocateAxisBoxFirstPhase(axis) {
912 // find the bounding box of the axis by looking at label
913 // widths/heights and ticks, make room by diminishing the
914 // plotOffset
916 var lw = axis.labelWidth,
917 lh = axis.labelHeight,
918 pos = axis.options.position,
919 tickLength = axis.options.tickLength,
920 axismargin = options.grid.axisMargin,
921 padding = options.grid.labelMargin,
922 all = axis.direction == "x" ? xaxes : yaxes,
923 index;
925 // determine axis margin
926 var samePosition = $.grep(all, function (a) {
927 return a && a.options.position == pos && a.reserveSpace;
928 });
929 if ($.inArray(axis, samePosition) == samePosition.length - 1)
930 axismargin = 0; // outermost
932 // determine tick length - if we're innermost, we can use "full"
933 if (tickLength == null)
934 tickLength = "full";
936 var sameDirection = $.grep(all, function (a) {
937 return a && a.reserveSpace;
938 });
940 var innermost = $.inArray(axis, sameDirection) == 0;
941 if (!innermost && tickLength == "full")
942 tickLength = 5;
944 if (!isNaN(+tickLength))
945 padding += +tickLength;
947 // compute box
948 if (axis.direction == "x") {
949 lh += padding;
951 if (pos == "bottom") {
952 plotOffset.bottom += lh + axismargin;
953 axis.box = { top: canvasHeight - plotOffset.bottom, height: lh };
954 }
955 else {
956 axis.box = { top: plotOffset.top + axismargin, height: lh };
957 plotOffset.top += lh + axismargin;
958 }
959 }
960 else {
961 lw += padding;
963 if (pos == "left") {
964 axis.box = { left: plotOffset.left + axismargin, width: lw };
965 plotOffset.left += lw + axismargin;
966 }
967 else {
968 plotOffset.right += lw + axismargin;
969 axis.box = { left: canvasWidth - plotOffset.right, width: lw };
970 }
971 }
973 // save for future reference
974 axis.position = pos;
975 axis.tickLength = tickLength;
976 axis.box.padding = padding;
977 axis.innermost = innermost;
978 }
980 function allocateAxisBoxSecondPhase(axis) {
981 // set remaining bounding box coordinates
982 if (axis.direction == "x") {
983 axis.box.left = plotOffset.left;
984 axis.box.width = plotWidth;
985 }
986 else {
987 axis.box.top = plotOffset.top;
988 axis.box.height = plotHeight;
989 }
990 }
992 function setupGrid() {
993 var i, axes = allAxes();
995 // first calculate the plot and axis box dimensions
997 $.each(axes, function (_, axis) {
998 axis.show = axis.options.show;
999 if (axis.show == null)
1000 axis.show = axis.used; // by default an axis is visible if it's got data
1002 axis.reserveSpace = axis.show || axis.options.reserveSpace;
1004 setRange(axis);
1005 });
1007 allocatedAxes = $.grep(axes, function (axis) { return axis.reserveSpace; });
1009 plotOffset.left = plotOffset.right = plotOffset.top = plotOffset.bottom = 0;
1010 if (options.grid.show) {
1011 $.each(allocatedAxes, function (_, axis) {
1012 // make the ticks
1013 setupTickGeneration(axis);
1014 setTicks(axis);
1015 snapRangeToTicks(axis, axis.ticks);
1017 // find labelWidth/Height for axis
1018 measureTickLabels(axis);
1019 });
1021 // with all dimensions in house, we can compute the
1022 // axis boxes, start from the outside (reverse order)
1023 for (i = allocatedAxes.length - 1; i >= 0; --i)
1024 allocateAxisBoxFirstPhase(allocatedAxes[i]);
1026 // make sure we've got enough space for things that
1027 // might stick out
1028 var minMargin = options.grid.minBorderMargin;
1029 if (minMargin == null) {
1030 minMargin = 0;
1031 for (i = 0; i < series.length; ++i)
1032 minMargin = Math.max(minMargin, series[i].points.radius + series[i].points.lineWidth/2);
1033 }
1035 for (var a in plotOffset) {
1036 plotOffset[a] += options.grid.borderWidth;
1037 plotOffset[a] = Math.max(minMargin, plotOffset[a]);
1038 }
1039 }
1041 plotWidth = canvasWidth - plotOffset.left - plotOffset.right;
1042 plotHeight = canvasHeight - plotOffset.bottom - plotOffset.top;
1044 // now we got the proper plotWidth/Height, we can compute the scaling
1045 $.each(axes, function (_, axis) {
1046 setTransformationHelpers(axis);
1047 });
1049 if (options.grid.show) {
1050 $.each(allocatedAxes, function (_, axis) {
1051 allocateAxisBoxSecondPhase(axis);
1052 });
1054 insertAxisLabels();
1055 }
1057 insertLegend();
1058 }
1060 function setRange(axis) {
1061 var opts = axis.options,
1062 min = +(opts.min != null ? opts.min : axis.datamin),
1063 max = +(opts.max != null ? opts.max : axis.datamax),
1064 delta = max - min;
1066 if (delta == 0.0) {
1067 // degenerate case
1068 var widen = max == 0 ? 1 : 0.01;
1070 if (opts.min == null)
1071 min -= widen;
1072 // always widen max if we couldn't widen min to ensure we
1073 // don't fall into min == max which doesn't work
1074 if (opts.max == null || opts.min != null)
1075 max += widen;
1076 }
1077 else {
1078 // consider autoscaling
1079 var margin = opts.autoscaleMargin;
1080 if (margin != null) {
1081 if (opts.min == null) {
1082 min -= delta * margin;
1083 // make sure we don't go below zero if all values
1084 // are positive
1085 if (min < 0 && axis.datamin != null && axis.datamin >= 0)
1086 min = 0;
1087 }
1088 if (opts.max == null) {
1089 max += delta * margin;
1090 if (max > 0 && axis.datamax != null && axis.datamax <= 0)
1091 max = 0;
1092 }
1093 }
1094 }
1095 axis.min = min;
1096 axis.max = max;
1097 }
1099 function setupTickGeneration(axis) {
1100 var opts = axis.options;
1102 // estimate number of ticks
1103 var noTicks;
1104 if (typeof opts.ticks == "number" && opts.ticks > 0)
1105 noTicks = opts.ticks;
1106 else
1107 // heuristic based on the model a*sqrt(x) fitted to
1108 // some data points that seemed reasonable
1109 noTicks = 0.3 * Math.sqrt(axis.direction == "x" ? canvasWidth : canvasHeight);
1111 var delta = (axis.max - axis.min) / noTicks,
1112 size, generator, unit, formatter, i, magn, norm;
1114 if (opts.mode == "time") {
1115 // pretty handling of time
1117 // map of app. size of time units in milliseconds
1118 var timeUnitSize = {
1119 "second": 1000,
1120 "minute": 60 * 1000,
1121 "hour": 60 * 60 * 1000,
1122 "day": 24 * 60 * 60 * 1000,
1123 "month": 30 * 24 * 60 * 60 * 1000,
1124 "year": 365.2425 * 24 * 60 * 60 * 1000
1125 };
1128 // the allowed tick sizes, after 1 year we use
1129 // an integer algorithm
1130 var spec = [
1131 [1, "second"], [2, "second"], [5, "second"], [10, "second"],
1132 [30, "second"],
1133 [1, "minute"], [2, "minute"], [5, "minute"], [10, "minute"],
1134 [30, "minute"],
1135 [1, "hour"], [2, "hour"], [4, "hour"],
1136 [8, "hour"], [12, "hour"],
1137 [1, "day"], [2, "day"], [3, "day"],
1138 [0.25, "month"], [0.5, "month"], [1, "month"],
1139 [2, "month"], [3, "month"], [6, "month"],
1140 [1, "year"]
1141 ];
1143 var minSize = 0;
1144 if (opts.minTickSize != null) {
1145 if (typeof opts.tickSize == "number")
1146 minSize = opts.tickSize;
1147 else
1148 minSize = opts.minTickSize[0] * timeUnitSize[opts.minTickSize[1]];
1149 }
1151 for (var i = 0; i < spec.length - 1; ++i)
1152 if (delta < (spec[i][0] * timeUnitSize[spec[i][1]]
1153 + spec[i + 1][0] * timeUnitSize[spec[i + 1][1]]) / 2
1154 && spec[i][0] * timeUnitSize[spec[i][1]] >= minSize)
1155 break;
1156 size = spec[i][0];
1157 unit = spec[i][1];
1159 // special-case the possibility of several years
1160 if (unit == "year") {
1161 magn = Math.pow(10, Math.floor(Math.log(delta / timeUnitSize.year) / Math.LN10));
1162 norm = (delta / timeUnitSize.year) / magn;
1163 if (norm < 1.5)
1164 size = 1;
1165 else if (norm < 3)
1166 size = 2;
1167 else if (norm < 7.5)
1168 size = 5;
1169 else
1170 size = 10;
1172 size *= magn;
1173 }
1175 axis.tickSize = opts.tickSize || [size, unit];
1177 generator = function(axis) {
1178 var ticks = [],
1179 tickSize = axis.tickSize[0], unit = axis.tickSize[1],
1180 d = new Date(axis.min);
1182 var step = tickSize * timeUnitSize[unit];
1184 if (unit == "second")
1185 d.setUTCSeconds(floorInBase(d.getUTCSeconds(), tickSize));
1186 if (unit == "minute")
1187 d.setUTCMinutes(floorInBase(d.getUTCMinutes(), tickSize));
1188 if (unit == "hour")
1189 d.setUTCHours(floorInBase(d.getUTCHours(), tickSize));
1190 if (unit == "month")
1191 d.setUTCMonth(floorInBase(d.getUTCMonth(), tickSize));
1192 if (unit == "year")
1193 d.setUTCFullYear(floorInBase(d.getUTCFullYear(), tickSize));
1195 // reset smaller components
1196 d.setUTCMilliseconds(0);
1197 if (step >= timeUnitSize.minute)
1198 d.setUTCSeconds(0);
1199 if (step >= timeUnitSize.hour)
1200 d.setUTCMinutes(0);
1201 if (step >= timeUnitSize.day)
1202 d.setUTCHours(0);
1203 if (step >= timeUnitSize.day * 4)
1204 d.setUTCDate(1);
1205 if (step >= timeUnitSize.year)
1206 d.setUTCMonth(0);
1209 var carry = 0, v = Number.NaN, prev;
1210 do {
1211 prev = v;
1212 v = d.getTime();
1213 ticks.push(v);
1214 if (unit == "month") {
1215 if (tickSize < 1) {
1216 // a bit complicated - we'll divide the month
1217 // up but we need to take care of fractions
1218 // so we don't end up in the middle of a day
1219 d.setUTCDate(1);
1220 var start = d.getTime();
1221 d.setUTCMonth(d.getUTCMonth() + 1);
1222 var end = d.getTime();
1223 d.setTime(v + carry * timeUnitSize.hour + (end - start) * tickSize);
1224 carry = d.getUTCHours();
1225 d.setUTCHours(0);
1226 }
1227 else
1228 d.setUTCMonth(d.getUTCMonth() + tickSize);
1229 }
1230 else if (unit == "year") {
1231 d.setUTCFullYear(d.getUTCFullYear() + tickSize);
1232 }
1233 else
1234 d.setTime(v + step);
1235 } while (v < axis.max && v != prev);
1237 return ticks;
1238 };
1240 formatter = function (v, axis) {
1241 var d = new Date(v);
1243 // first check global format
1244 if (opts.timeformat != null)
1245 return $.plot.formatDate(d, opts.timeformat, opts.monthNames);
1247 var t = axis.tickSize[0] * timeUnitSize[axis.tickSize[1]];
1248 var span = axis.max - axis.min;
1249 var suffix = (opts.twelveHourClock) ? " %p" : "";
1251 if (t < timeUnitSize.minute)
1252 fmt = "%h:%M:%S" + suffix;
1253 else if (t < timeUnitSize.day) {
1254 if (span < 2 * timeUnitSize.day)
1255 fmt = "%h:%M" + suffix;
1256 else
1257 fmt = "%b %d %h:%M" + suffix;
1258 }
1259 else if (t < timeUnitSize.month)
1260 fmt = "%b %d";
1261 else if (t < timeUnitSize.year) {
1262 if (span < timeUnitSize.year)
1263 fmt = "%b";
1264 else
1265 fmt = "%b %y";
1266 }
1267 else
1268 fmt = "%y";
1270 return $.plot.formatDate(d, fmt, opts.monthNames);
1271 };
1272 }
1273 else {
1274 // pretty rounding of base-10 numbers
1275 var maxDec = opts.tickDecimals;
1276 var dec = -Math.floor(Math.log(delta) / Math.LN10);
1277 if (maxDec != null && dec > maxDec)
1278 dec = maxDec;
1280 magn = Math.pow(10, -dec);
1281 norm = delta / magn; // norm is between 1.0 and 10.0
1283 if (norm < 1.5)
1284 size = 1;
1285 else if (norm < 3) {
1286 size = 2;
1287 // special case for 2.5, requires an extra decimal
1288 if (norm > 2.25 && (maxDec == null || dec + 1 <= maxDec)) {
1289 size = 2.5;
1290 ++dec;
1291 }
1292 }
1293 else if (norm < 7.5)
1294 size = 5;
1295 else
1296 size = 10;
1298 size *= magn;
1300 if (opts.minTickSize != null && size < opts.minTickSize)
1301 size = opts.minTickSize;
1303 axis.tickDecimals = Math.max(0, maxDec != null ? maxDec : dec);
1304 axis.tickSize = opts.tickSize || size;
1306 generator = function (axis) {
1307 var ticks = [];
1309 // spew out all possible ticks
1310 var start = floorInBase(axis.min, axis.tickSize),
1311 i = 0, v = Number.NaN, prev;
1312 do {
1313 prev = v;
1314 v = start + i * axis.tickSize;
1315 ticks.push(v);
1316 ++i;
1317 } while (v < axis.max && v != prev);
1318 return ticks;
1319 };
1321 formatter = function (v, axis) {
1322 return v.toFixed(axis.tickDecimals);
1323 };
1324 }
1326 if (opts.alignTicksWithAxis != null) {
1327 var otherAxis = (axis.direction == "x" ? xaxes : yaxes)[opts.alignTicksWithAxis - 1];
1328 if (otherAxis && otherAxis.used && otherAxis != axis) {
1329 // consider snapping min/max to outermost nice ticks
1330 var niceTicks = generator(axis);
1331 if (niceTicks.length > 0) {
1332 if (opts.min == null)
1333 axis.min = Math.min(axis.min, niceTicks[0]);
1334 if (opts.max == null && niceTicks.length > 1)
1335 axis.max = Math.max(axis.max, niceTicks[niceTicks.length - 1]);
1336 }
1338 generator = function (axis) {
1339 // copy ticks, scaled to this axis
1340 var ticks = [], v, i;
1341 for (i = 0; i < otherAxis.ticks.length; ++i) {
1342 v = (otherAxis.ticks[i].v - otherAxis.min) / (otherAxis.max - otherAxis.min);
1343 v = axis.min + v * (axis.max - axis.min);
1344 ticks.push(v);
1345 }
1346 return ticks;
1347 };
1349 // we might need an extra decimal since forced
1350 // ticks don't necessarily fit naturally
1351 if (axis.mode != "time" && opts.tickDecimals == null) {
1352 var extraDec = Math.max(0, -Math.floor(Math.log(delta) / Math.LN10) + 1),
1353 ts = generator(axis);
1355 // only proceed if the tick interval rounded
1356 // with an extra decimal doesn't give us a
1357 // zero at end
1358 if (!(ts.length > 1 && /\..*0$/.test((ts[1] - ts[0]).toFixed(extraDec))))
1359 axis.tickDecimals = extraDec;
1360 }
1361 }
1362 }
1364 axis.tickGenerator = generator;
1365 if ($.isFunction(opts.tickFormatter))
1366 axis.tickFormatter = function (v, axis) { return "" + opts.tickFormatter(v, axis); };
1367 else
1368 axis.tickFormatter = formatter;
1369 }
1371 function setTicks(axis) {
1372 var oticks = axis.options.ticks, ticks = [];
1373 if (oticks == null || (typeof oticks == "number" && oticks > 0))
1374 ticks = axis.tickGenerator(axis);
1375 else if (oticks) {
1376 if ($.isFunction(oticks))
1377 // generate the ticks
1378 ticks = oticks({ min: axis.min, max: axis.max });
1379 else
1380 ticks = oticks;
1381 }
1383 // clean up/labelify the supplied ticks, copy them over
1384 var i, v;
1385 axis.ticks = [];
1386 for (i = 0; i < ticks.length; ++i) {
1387 var label = null;
1388 var t = ticks[i];
1389 if (typeof t == "object") {
1390 v = +t[0];
1391 if (t.length > 1)
1392 label = t[1];
1393 }
1394 else
1395 v = +t;
1396 if (label == null)
1397 label = axis.tickFormatter(v, axis);
1398 if (!isNaN(v))
1399 axis.ticks.push({ v: v, label: label });
1400 }
1401 }
1403 function snapRangeToTicks(axis, ticks) {
1404 if (axis.options.autoscaleMargin && ticks.length > 0) {
1405 // snap to ticks
1406 if (axis.options.min == null)
1407 axis.min = Math.min(axis.min, ticks[0].v);
1408 if (axis.options.max == null && ticks.length > 1)
1409 axis.max = Math.max(axis.max, ticks[ticks.length - 1].v);
1410 }
1411 }
1413 function draw() {
1414 ctx.clearRect(0, 0, canvasWidth, canvasHeight);
1416 var grid = options.grid;
1418 // draw background, if any
1419 if (grid.show && grid.backgroundColor)
1420 drawBackground();
1422 if (grid.show && !grid.aboveData)
1423 drawGrid();
1425 for (var i = 0; i < series.length; ++i) {
1426 executeHooks(hooks.drawSeries, [ctx, series[i]]);
1427 drawSeries(series[i]);
1428 }
1430 executeHooks(hooks.draw, [ctx]);
1432 if (grid.show && grid.aboveData)
1433 drawGrid();
1434 }
1436 function extractRange(ranges, coord) {
1437 var axis, from, to, key, axes = allAxes();
1439 for (i = 0; i < axes.length; ++i) {
1440 axis = axes[i];
1441 if (axis.direction == coord) {
1442 key = coord + axis.n + "axis";
1443 if (!ranges[key] && axis.n == 1)
1444 key = coord + "axis"; // support x1axis as xaxis
1445 if (ranges[key]) {
1446 from = ranges[key].from;
1447 to = ranges[key].to;
1448 break;
1449 }
1450 }
1451 }
1453 // backwards-compat stuff - to be removed in future
1454 if (!ranges[key]) {
1455 axis = coord == "x" ? xaxes[0] : yaxes[0];
1456 from = ranges[coord + "1"];
1457 to = ranges[coord + "2"];
1458 }
1460 // auto-reverse as an added bonus
1461 if (from != null && to != null && from > to) {
1462 var tmp = from;
1463 from = to;
1464 to = tmp;
1465 }
1467 return { from: from, to: to, axis: axis };
1468 }
1470 function drawBackground() {
1471 ctx.save();
1472 ctx.translate(plotOffset.left, plotOffset.top);
1474 ctx.fillStyle = getColorOrGradient(options.grid.backgroundColor, plotHeight, 0, "rgba(255, 255, 255, 0)");
1475 ctx.fillRect(0, 0, plotWidth, plotHeight);
1476 ctx.restore();
1477 }
1479 function drawGrid() {
1480 var i;
1482 ctx.save();
1483 ctx.translate(plotOffset.left, plotOffset.top);
1485 // draw markings
1486 var markings = options.grid.markings;
1487 if (markings) {
1488 if ($.isFunction(markings)) {
1489 var axes = plot.getAxes();
1490 // xmin etc. is backwards compatibility, to be
1491 // removed in the future
1492 axes.xmin = axes.xaxis.min;
1493 axes.xmax = axes.xaxis.max;
1494 axes.ymin = axes.yaxis.min;
1495 axes.ymax = axes.yaxis.max;
1497 markings = markings(axes);
1498 }
1500 for (i = 0; i < markings.length; ++i) {
1501 var m = markings[i],
1502 xrange = extractRange(m, "x"),
1503 yrange = extractRange(m, "y");
1505 // fill in missing
1506 if (xrange.from == null)
1507 xrange.from = xrange.axis.min;
1508 if (xrange.to == null)
1509 xrange.to = xrange.axis.max;
1510 if (yrange.from == null)
1511 yrange.from = yrange.axis.min;
1512 if (yrange.to == null)
1513 yrange.to = yrange.axis.max;
1515 // clip
1516 if (xrange.to < xrange.axis.min || xrange.from > xrange.axis.max ||
1517 yrange.to < yrange.axis.min || yrange.from > yrange.axis.max)
1518 continue;
1520 xrange.from = Math.max(xrange.from, xrange.axis.min);
1521 xrange.to = Math.min(xrange.to, xrange.axis.max);
1522 yrange.from = Math.max(yrange.from, yrange.axis.min);
1523 yrange.to = Math.min(yrange.to, yrange.axis.max);
1525 if (xrange.from == xrange.to && yrange.from == yrange.to)
1526 continue;
1528 // then draw
1529 xrange.from = xrange.axis.p2c(xrange.from);
1530 xrange.to = xrange.axis.p2c(xrange.to);
1531 yrange.from = yrange.axis.p2c(yrange.from);
1532 yrange.to = yrange.axis.p2c(yrange.to);
1534 if (xrange.from == xrange.to || yrange.from == yrange.to) {
1535 // draw line
1536 ctx.beginPath();
1537 ctx.strokeStyle = m.color || options.grid.markingsColor;
1538 ctx.lineWidth = m.lineWidth || options.grid.markingsLineWidth;
1539 ctx.moveTo(xrange.from, yrange.from);
1540 ctx.lineTo(xrange.to, yrange.to);
1541 ctx.stroke();
1542 }
1543 else {
1544 // fill area
1545 ctx.fillStyle = m.color || options.grid.markingsColor;
1546 ctx.fillRect(xrange.from, yrange.to,
1547 xrange.to - xrange.from,
1548 yrange.from - yrange.to);
1549 }
1550 }
1551 }
1553 // draw the ticks
1554 var axes = allAxes(), bw = options.grid.borderWidth;
1556 for (var j = 0; j < axes.length; ++j) {
1557 var axis = axes[j], box = axis.box,
1558 t = axis.tickLength, x, y, xoff, yoff;
1559 if (!axis.show || axis.ticks.length == 0)
1560 continue
1562 ctx.strokeStyle = axis.options.tickColor || $.color.parse(axis.options.color).scale('a', 0.22).toString();
1563 ctx.lineWidth = 1;
1565 // find the edges
1566 if (axis.direction == "x") {
1567 x = 0;
1568 if (t == "full")
1569 y = (axis.position == "top" ? 0 : plotHeight);
1570 else
1571 y = box.top - plotOffset.top + (axis.position == "top" ? box.height : 0);
1572 }
1573 else {
1574 y = 0;
1575 if (t == "full")
1576 x = (axis.position == "left" ? 0 : plotWidth);
1577 else
1578 x = box.left - plotOffset.left + (axis.position == "left" ? box.width : 0);
1579 }
1581 // draw tick bar
1582 if (!axis.innermost) {
1583 ctx.beginPath();
1584 xoff = yoff = 0;
1585 if (axis.direction == "x")
1586 xoff = plotWidth;
1587 else
1588 yoff = plotHeight;
1590 if (ctx.lineWidth == 1) {
1591 x = Math.floor(x) + 0.5;
1592 y = Math.floor(y) + 0.5;
1593 }
1595 ctx.moveTo(x, y);
1596 ctx.lineTo(x + xoff, y + yoff);
1597 ctx.stroke();
1598 }
1600 // draw ticks
1601 ctx.beginPath();
1602 for (i = 0; i < axis.ticks.length; ++i) {
1603 var v = axis.ticks[i].v;
1605 xoff = yoff = 0;
1607 if (v < axis.min || v > axis.max
1608 // skip those lying on the axes if we got a border
1609 || (t == "full" && bw > 0
1610 && (v == axis.min || v == axis.max)))
1611 continue;
1613 if (axis.direction == "x") {
1614 x = axis.p2c(v);
1615 yoff = t == "full" ? -plotHeight : t;
1617 if (axis.position == "top")
1618 yoff = -yoff;
1619 }
1620 else {
1621 y = axis.p2c(v);
1622 xoff = t == "full" ? -plotWidth : t;
1624 if (axis.position == "left")
1625 xoff = -xoff;
1626 }
1628 if (ctx.lineWidth == 1) {
1629 if (axis.direction == "x")
1630 x = Math.floor(x) + 0.5;
1631 else
1632 y = Math.floor(y) + 0.5;
1633 }
1635 ctx.moveTo(x, y);
1636 ctx.lineTo(x + xoff, y + yoff);
1637 }
1639 ctx.stroke();
1640 }
1643 // draw border
1644 if (bw) {
1645 ctx.lineWidth = bw;
1646 ctx.strokeStyle = options.grid.borderColor;
1647 ctx.strokeRect(-bw/2, -bw/2, plotWidth + bw, plotHeight + bw);
1648 }
1650 ctx.restore();
1651 }
1653 function insertAxisLabels() {
1654 placeholder.find(".tickLabels").remove();
1656 var html = ['<div class="tickLabels" style="font-size:smaller">'];
1658 var axes = allAxes();
1659 for (var j = 0; j < axes.length; ++j) {
1660 var axis = axes[j], box = axis.box;
1661 if (!axis.show)
1662 continue;
1663 //debug: html.push('<div style="position:absolute;opacity:0.10;background-color:red;left:' + box.left + 'px;top:' + box.top + 'px;width:' + box.width + 'px;height:' + box.height + 'px"></div>')
1664 html.push('<div class="' + axis.direction + 'Axis ' + axis.direction + axis.n + 'Axis" style="color:' + axis.options.color + '">');
1665 for (var i = 0; i < axis.ticks.length; ++i) {
1666 var tick = axis.ticks[i];
1667 if (!tick.label || tick.v < axis.min || tick.v > axis.max)
1668 continue;
1670 var pos = {}, align;
1672 if (axis.direction == "x") {
1673 align = "center";
1674 pos.left = Math.round(plotOffset.left + axis.p2c(tick.v) - axis.labelWidth/2);
1675 if (axis.position == "bottom")
1676 pos.top = box.top + box.padding;
1677 else
1678 pos.bottom = canvasHeight - (box.top + box.height - box.padding);
1679 }
1680 else {
1681 pos.top = Math.round(plotOffset.top + axis.p2c(tick.v) - axis.labelHeight/2);
1682 if (axis.position == "left") {
1683 pos.right = canvasWidth - (box.left + box.width - box.padding)
1684 align = "right";
1685 }
1686 else {
1687 pos.left = box.left + box.padding;
1688 align = "left";
1689 }
1690 }
1692 pos.width = axis.labelWidth;
1694 var style = ["position:absolute", "text-align:" + align ];
1695 for (var a in pos)
1696 style.push(a + ":" + pos[a] + "px")
1698 html.push('<div class="tickLabel" style="' + style.join(';') + '">' + tick.label + '</div>');
1699 }
1700 html.push('</div>');
1701 }
1703 html.push('</div>');
1705 placeholder.append(html.join(""));
1706 }
1708 function drawSeries(series) {
1709 if (series.lines.show)
1710 drawSeriesLines(series);
1711 if (series.bars.show)
1712 drawSeriesBars(series);
1713 if (series.points.show)
1714 drawSeriesPoints(series);
1715 }
1717 function drawSeriesLines(series) {
1718 function plotLine(datapoints, xoffset, yoffset, axisx, axisy) {
1719 var points = datapoints.points,
1720 ps = datapoints.pointsize,
1721 prevx = null, prevy = null;
1723 ctx.beginPath();
1724 for (var i = ps; i < points.length; i += ps) {
1725 var x1 = points[i - ps], y1 = points[i - ps + 1],
1726 x2 = points[i], y2 = points[i + 1];
1728 if (x1 == null || x2 == null)
1729 continue;
1731 // clip with ymin
1732 if (y1 <= y2 && y1 < axisy.min) {
1733 if (y2 < axisy.min)
1734 continue; // line segment is outside
1735 // compute new intersection point
1736 x1 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
1737 y1 = axisy.min;
1738 }
1739 else if (y2 <= y1 && y2 < axisy.min) {
1740 if (y1 < axisy.min)
1741 continue;
1742 x2 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
1743 y2 = axisy.min;
1744 }
1746 // clip with ymax
1747 if (y1 >= y2 && y1 > axisy.max) {
1748 if (y2 > axisy.max)
1749 continue;
1750 x1 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
1751 y1 = axisy.max;
1752 }
1753 else if (y2 >= y1 && y2 > axisy.max) {
1754 if (y1 > axisy.max)
1755 continue;
1756 x2 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
1757 y2 = axisy.max;
1758 }
1760 // clip with xmin
1761 if (x1 <= x2 && x1 < axisx.min) {
1762 if (x2 < axisx.min)
1763 continue;
1764 y1 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
1765 x1 = axisx.min;
1766 }
1767 else if (x2 <= x1 && x2 < axisx.min) {
1768 if (x1 < axisx.min)
1769 continue;
1770 y2 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
1771 x2 = axisx.min;
1772 }
1774 // clip with xmax
1775 if (x1 >= x2 && x1 > axisx.max) {
1776 if (x2 > axisx.max)
1777 continue;
1778 y1 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
1779 x1 = axisx.max;
1780 }
1781 else if (x2 >= x1 && x2 > axisx.max) {
1782 if (x1 > axisx.max)
1783 continue;
1784 y2 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
1785 x2 = axisx.max;
1786 }
1788 if (x1 != prevx || y1 != prevy)
1789 ctx.moveTo(axisx.p2c(x1) + xoffset, axisy.p2c(y1) + yoffset);
1791 prevx = x2;
1792 prevy = y2;
1793 ctx.lineTo(axisx.p2c(x2) + xoffset, axisy.p2c(y2) + yoffset);
1794 }
1795 ctx.stroke();
1796 }
1798 function plotLineArea(datapoints, axisx, axisy) {
1799 var points = datapoints.points,
1800 ps = datapoints.pointsize,
1801 bottom = Math.min(Math.max(0, axisy.min), axisy.max),
1802 i = 0, top, areaOpen = false,
1803 ypos = 1, segmentStart = 0, segmentEnd = 0;
1805 // we process each segment in two turns, first forward
1806 // direction to sketch out top, then once we hit the
1807 // end we go backwards to sketch the bottom
1808 while (true) {
1809 if (ps > 0 && i > points.length + ps)
1810 break;
1812 i += ps; // ps is negative if going backwards
1814 var x1 = points[i - ps],
1815 y1 = points[i - ps + ypos],
1816 x2 = points[i], y2 = points[i + ypos];
1818 if (areaOpen) {
1819 if (ps > 0 && x1 != null && x2 == null) {
1820 // at turning point
1821 segmentEnd = i;
1822 ps = -ps;
1823 ypos = 2;
1824 continue;
1825 }
1827 if (ps < 0 && i == segmentStart + ps) {
1828 // done with the reverse sweep
1829 ctx.fill();
1830 areaOpen = false;
1831 ps = -ps;
1832 ypos = 1;
1833 i = segmentStart = segmentEnd + ps;
1834 continue;
1835 }
1836 }
1838 if (x1 == null || x2 == null)
1839 continue;
1841 // clip x values
1843 // clip with xmin
1844 if (x1 <= x2 && x1 < axisx.min) {
1845 if (x2 < axisx.min)
1846 continue;
1847 y1 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
1848 x1 = axisx.min;
1849 }
1850 else if (x2 <= x1 && x2 < axisx.min) {
1851 if (x1 < axisx.min)
1852 continue;
1853 y2 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
1854 x2 = axisx.min;
1855 }
1857 // clip with xmax
1858 if (x1 >= x2 && x1 > axisx.max) {
1859 if (x2 > axisx.max)
1860 continue;
1861 y1 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
1862 x1 = axisx.max;
1863 }
1864 else if (x2 >= x1 && x2 > axisx.max) {
1865 if (x1 > axisx.max)
1866 continue;
1867 y2 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
1868 x2 = axisx.max;
1869 }
1871 if (!areaOpen) {
1872 // open area
1873 ctx.beginPath();
1874 ctx.moveTo(axisx.p2c(x1), axisy.p2c(bottom));
1875 areaOpen = true;
1876 }
1878 // now first check the case where both is outside
1879 if (y1 >= axisy.max && y2 >= axisy.max) {
1880 ctx.lineTo(axisx.p2c(x1), axisy.p2c(axisy.max));
1881 ctx.lineTo(axisx.p2c(x2), axisy.p2c(axisy.max));
1882 continue;
1883 }
1884 else if (y1 <= axisy.min && y2 <= axisy.min) {
1885 ctx.lineTo(axisx.p2c(x1), axisy.p2c(axisy.min));
1886 ctx.lineTo(axisx.p2c(x2), axisy.p2c(axisy.min));
1887 continue;
1888 }
1890 // else it's a bit more complicated, there might
1891 // be a flat maxed out rectangle first, then a
1892 // triangular cutout or reverse; to find these
1893 // keep track of the current x values
1894 var x1old = x1, x2old = x2;
1896 // clip the y values, without shortcutting, we
1897 // go through all cases in turn
1899 // clip with ymin
1900 if (y1 <= y2 && y1 < axisy.min && y2 >= axisy.min) {
1901 x1 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
1902 y1 = axisy.min;
1903 }
1904 else if (y2 <= y1 && y2 < axisy.min && y1 >= axisy.min) {
1905 x2 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
1906 y2 = axisy.min;
1907 }
1909 // clip with ymax
1910 if (y1 >= y2 && y1 > axisy.max && y2 <= axisy.max) {
1911 x1 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
1912 y1 = axisy.max;
1913 }
1914 else if (y2 >= y1 && y2 > axisy.max && y1 <= axisy.max) {
1915 x2 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
1916 y2 = axisy.max;
1917 }
1919 // if the x value was changed we got a rectangle
1920 // to fill
1921 if (x1 != x1old) {
1922 ctx.lineTo(axisx.p2c(x1old), axisy.p2c(y1));
1923 // it goes to (x1, y1), but we fill that below
1924 }
1926 // fill triangular section, this sometimes result
1927 // in redundant points if (x1, y1) hasn't changed
1928 // from previous line to, but we just ignore that
1929 ctx.lineTo(axisx.p2c(x1), axisy.p2c(y1));
1930 ctx.lineTo(axisx.p2c(x2), axisy.p2c(y2));
1932 // fill the other rectangle if it's there
1933 if (x2 != x2old) {
1934 ctx.lineTo(axisx.p2c(x2), axisy.p2c(y2));
1935 ctx.lineTo(axisx.p2c(x2old), axisy.p2c(y2));
1936 }
1937 }
1938 }
1940 ctx.save();
1941 ctx.translate(plotOffset.left, plotOffset.top);
1942 ctx.lineJoin = "round";
1944 var lw = series.lines.lineWidth,
1945 sw = series.shadowSize;
1946 // FIXME: consider another form of shadow when filling is turned on
1947 if (lw > 0 && sw > 0) {
1948 // draw shadow as a thick and thin line with transparency
1949 ctx.lineWidth = sw;
1950 ctx.strokeStyle = "rgba(0,0,0,0.1)";
1951 // position shadow at angle from the mid of line
1952 var angle = Math.PI/18;
1953 plotLine(series.datapoints, Math.sin(angle) * (lw/2 + sw/2), Math.cos(angle) * (lw/2 + sw/2), series.xaxis, series.yaxis);
1954 ctx.lineWidth = sw/2;
1955 plotLine(series.datapoints, Math.sin(angle) * (lw/2 + sw/4), Math.cos(angle) * (lw/2 + sw/4), series.xaxis, series.yaxis);
1956 }
1958 ctx.lineWidth = lw;
1959 ctx.strokeStyle = series.color;
1960 var fillStyle = getFillStyle(series.lines, series.color, 0, plotHeight);
1961 if (fillStyle) {
1962 ctx.fillStyle = fillStyle;
1963 plotLineArea(series.datapoints, series.xaxis, series.yaxis);
1964 }
1966 if (lw > 0)
1967 plotLine(series.datapoints, 0, 0, series.xaxis, series.yaxis);
1968 ctx.restore();
1969 }
1971 function drawSeriesPoints(series) {
1972 function plotPoints(datapoints, radius, fillStyle, offset, shadow, axisx, axisy, symbol) {
1973 var points = datapoints.points, ps = datapoints.pointsize;
1975 for (var i = 0; i < points.length; i += ps) {
1976 var x = points[i], y = points[i + 1];
1977 if (x == null || x < axisx.min || x > axisx.max || y < axisy.min || y > axisy.max)
1978 continue;
1980 ctx.beginPath();
1981 x = axisx.p2c(x);
1982 y = axisy.p2c(y) + offset;
1983 if (symbol == "circle")
1984 ctx.arc(x, y, radius, 0, shadow ? Math.PI : Math.PI * 2, false);
1985 else
1986 symbol(ctx, x, y, radius, shadow);
1987 ctx.closePath();
1989 if (fillStyle) {
1990 ctx.fillStyle = fillStyle;
1991 ctx.fill();
1992 }
1993 ctx.stroke();
1994 }
1995 }
1997 ctx.save();
1998 ctx.translate(plotOffset.left, plotOffset.top);
2000 var lw = series.points.lineWidth,
2001 sw = series.shadowSize,
2002 radius = series.points.radius,
2003 symbol = series.points.symbol;
2004 if (lw > 0 && sw > 0) {
2005 // draw shadow in two steps
2006 var w = sw / 2;
2007 ctx.lineWidth = w;
2008 ctx.strokeStyle = "rgba(0,0,0,0.1)";
2009 plotPoints(series.datapoints, radius, null, w + w/2, true,
2010 series.xaxis, series.yaxis, symbol);
2012 ctx.strokeStyle = "rgba(0,0,0,0.2)";
2013 plotPoints(series.datapoints, radius, null, w/2, true,
2014 series.xaxis, series.yaxis, symbol);
2015 }
2017 ctx.lineWidth = lw;
2018 ctx.strokeStyle = series.color;
2019 plotPoints(series.datapoints, radius,
2020 getFillStyle(series.points, series.color), 0, false,
2021 series.xaxis, series.yaxis, symbol);
2022 ctx.restore();
2023 }
2025 function drawBar(x, y, b, barLeft, barRight, offset, fillStyleCallback, axisx, axisy, c, horizontal, lineWidth) {
2026 var left, right, bottom, top,
2027 drawLeft, drawRight, drawTop, drawBottom,
2028 tmp;
2030 // in horizontal mode, we start the bar from the left
2031 // instead of from the bottom so it appears to be
2032 // horizontal rather than vertical
2033 if (horizontal) {
2034 drawBottom = drawRight = drawTop = true;
2035 drawLeft = false;
2036 left = b;
2037 right = x;
2038 top = y + barLeft;
2039 bottom = y + barRight;
2041 // account for negative bars
2042 if (right < left) {
2043 tmp = right;
2044 right = left;
2045 left = tmp;
2046 drawLeft = true;
2047 drawRight = false;
2048 }
2049 }
2050 else {
2051 drawLeft = drawRight = drawTop = true;
2052 drawBottom = false;
2053 left = x + barLeft;
2054 right = x + barRight;
2055 bottom = b;
2056 top = y;
2058 // account for negative bars
2059 if (top < bottom) {
2060 tmp = top;
2061 top = bottom;
2062 bottom = tmp;
2063 drawBottom = true;
2064 drawTop = false;
2065 }
2066 }
2068 // clip
2069 if (right < axisx.min || left > axisx.max ||
2070 top < axisy.min || bottom > axisy.max)
2071 return;
2073 if (left < axisx.min) {
2074 left = axisx.min;
2075 drawLeft = false;
2076 }
2078 if (right > axisx.max) {
2079 right = axisx.max;
2080 drawRight = false;
2081 }
2083 if (bottom < axisy.min) {
2084 bottom = axisy.min;
2085 drawBottom = false;
2086 }
2088 if (top > axisy.max) {
2089 top = axisy.max;
2090 drawTop = false;
2091 }
2093 left = axisx.p2c(left);
2094 bottom = axisy.p2c(bottom);
2095 right = axisx.p2c(right);
2096 top = axisy.p2c(top);
2098 // fill the bar
2099 if (fillStyleCallback) {
2100 c.beginPath();
2101 c.moveTo(left, bottom);
2102 c.lineTo(left, top);
2103 c.lineTo(right, top);
2104 c.lineTo(right, bottom);
2105 c.fillStyle = fillStyleCallback(bottom, top);
2106 c.fill();
2107 }
2109 // draw outline
2110 if (lineWidth > 0 && (drawLeft || drawRight || drawTop || drawBottom)) {
2111 c.beginPath();
2113 // FIXME: inline moveTo is buggy with excanvas
2114 c.moveTo(left, bottom + offset);
2115 if (drawLeft)
2116 c.lineTo(left, top + offset);
2117 else
2118 c.moveTo(left, top + offset);
2119 if (drawTop)
2120 c.lineTo(right, top + offset);
2121 else
2122 c.moveTo(right, top + offset);
2123 if (drawRight)
2124 c.lineTo(right, bottom + offset);
2125 else
2126 c.moveTo(right, bottom + offset);
2127 if (drawBottom)
2128 c.lineTo(left, bottom + offset);
2129 else
2130 c.moveTo(left, bottom + offset);
2131 c.stroke();
2132 }
2133 }
2135 function drawSeriesBars(series) {
2136 function plotBars(datapoints, barLeft, barRight, offset, fillStyleCallback, axisx, axisy) {
2137 var points = datapoints.points, ps = datapoints.pointsize;
2139 for (var i = 0; i < points.length; i += ps) {
2140 if (points[i] == null)
2141 continue;
2142 drawBar(points[i], points[i + 1], points[i + 2], barLeft, barRight, offset, fillStyleCallback, axisx, axisy, ctx, series.bars.horizontal, series.bars.lineWidth);
2143 }
2144 }
2146 ctx.save();
2147 ctx.translate(plotOffset.left, plotOffset.top);
2149 // FIXME: figure out a way to add shadows (for instance along the right edge)
2150 ctx.lineWidth = series.bars.lineWidth;
2151 ctx.strokeStyle = series.color;
2152 var barLeft = series.bars.align == "left" ? 0 : -series.bars.barWidth/2;
2153 var fillStyleCallback = series.bars.fill ? function (bottom, top) { return getFillStyle(series.bars, series.color, bottom, top); } : null;
2154 plotBars(series.datapoints, barLeft, barLeft + series.bars.barWidth, 0, fillStyleCallback, series.xaxis, series.yaxis);
2155 ctx.restore();
2156 }
2158 function getFillStyle(filloptions, seriesColor, bottom, top) {
2159 var fill = filloptions.fill;
2160 if (!fill)
2161 return null;
2163 if (filloptions.fillColor)
2164 return getColorOrGradient(filloptions.fillColor, bottom, top, seriesColor);
2166 var c = $.color.parse(seriesColor);
2167 c.a = typeof fill == "number" ? fill : 0.4;
2168 c.normalize();
2169 return c.toString();
2170 }
2172 function insertLegend() {
2173 placeholder.find(".legend").remove();
2175 if (!options.legend.show)
2176 return;
2178 var fragments = [], rowStarted = false,
2179 lf = options.legend.labelFormatter, s, label;
2180 for (var i = 0; i < series.length; ++i) {
2181 s = series[i];
2182 label = s.label;
2183 if (!label)
2184 continue;
2186 if (i % options.legend.noColumns == 0) {
2187 if (rowStarted)
2188 fragments.push('</tr>');
2189 fragments.push('<tr>');
2190 rowStarted = true;
2191 }
2193 if (lf)
2194 label = lf(label, s);
2196 fragments.push(
2197 '<td class="legendColorBox"><div style="border:1px solid ' + options.legend.labelBoxBorderColor + ';padding:1px"><div style="width:4px;height:0;border:5px solid ' + s.color + ';overflow:hidden"></div></div></td>' +
2198 '<td class="legendLabel">' + label + '</td>');
2199 }
2200 if (rowStarted)
2201 fragments.push('</tr>');
2203 if (fragments.length == 0)
2204 return;
2206 var table = '<table style="font-size:smaller;color:' + options.grid.color + '">' + fragments.join("") + '</table>';
2207 if (options.legend.container != null)
2208 $(options.legend.container).html(table);
2209 else {
2210 var pos = "",
2211 p = options.legend.position,
2212 m = options.legend.margin;
2213 if (m[0] == null)
2214 m = [m, m];
2215 if (p.charAt(0) == "n")
2216 pos += 'top:' + (m[1] + plotOffset.top) + 'px;';
2217 else if (p.charAt(0) == "s")
2218 pos += 'bottom:' + (m[1] + plotOffset.bottom) + 'px;';
2219 if (p.charAt(1) == "e")
2220 pos += 'right:' + (m[0] + plotOffset.right) + 'px;';
2221 else if (p.charAt(1) == "w")
2222 pos += 'left:' + (m[0] + plotOffset.left) + 'px;';
2223 var legend = $('<div class="legend">' + table.replace('style="', 'style="position:absolute;' + pos +';') + '</div>').appendTo(placeholder);
2224 if (options.legend.backgroundOpacity != 0.0) {
2225 // put in the transparent background
2226 // separately to avoid blended labels and
2227 // label boxes
2228 var c = options.legend.backgroundColor;
2229 if (c == null) {
2230 c = options.grid.backgroundColor;
2231 if (c && typeof c == "string")
2232 c = $.color.parse(c);
2233 else
2234 c = $.color.extract(legend, 'background-color');
2235 c.a = 1;
2236 c = c.toString();
2237 }
2238 var div = legend.children();
2239 $('<div style="position:absolute;width:' + div.width() + 'px;height:' + div.height() + 'px;' + pos +'background-color:' + c + ';"> </div>').prependTo(legend).css('opacity', options.legend.backgroundOpacity);
2240 }
2241 }
2242 }
2245 // interactive features
2247 var highlights = [],
2248 redrawTimeout = null;
2250 // returns the data item the mouse is over, or null if none is found
2251 function findNearbyItem(mouseX, mouseY, seriesFilter) {
2252 var maxDistance = options.grid.mouseActiveRadius,
2253 smallestDistance = maxDistance * maxDistance + 1,
2254 item = null, foundPoint = false, i, j;
2256 for (i = series.length - 1; i >= 0; --i) {
2257 if (!seriesFilter(series[i]))
2258 continue;
2260 var s = series[i],
2261 axisx = s.xaxis,
2262 axisy = s.yaxis,
2263 points = s.datapoints.points,
2264 ps = s.datapoints.pointsize,
2265 mx = axisx.c2p(mouseX), // precompute some stuff to make the loop faster
2266 my = axisy.c2p(mouseY),
2267 maxx = maxDistance / axisx.scale,
2268 maxy = maxDistance / axisy.scale;
2270 // with inverse transforms, we can't use the maxx/maxy
2271 // optimization, sadly
2272 if (axisx.options.inverseTransform)
2273 maxx = Number.MAX_VALUE;
2274 if (axisy.options.inverseTransform)
2275 maxy = Number.MAX_VALUE;
2277 if (s.lines.show || s.points.show) {
2278 for (j = 0; j < points.length; j += ps) {
2279 var x = points[j], y = points[j + 1];
2280 if (x == null)
2281 continue;
2283 // For points and lines, the cursor must be within a
2284 // certain distance to the data point
2285 if (x - mx > maxx || x - mx < -maxx ||
2286 y - my > maxy || y - my < -maxy)
2287 continue;
2289 // We have to calculate distances in pixels, not in
2290 // data units, because the scales of the axes may be different
2291 var dx = Math.abs(axisx.p2c(x) - mouseX),
2292 dy = Math.abs(axisy.p2c(y) - mouseY),
2293 dist = dx * dx + dy * dy; // we save the sqrt
2295 // use <= to ensure last point takes precedence
2296 // (last generally means on top of)
2297 if (dist < smallestDistance) {
2298 smallestDistance = dist;
2299 item = [i, j / ps];
2300 }
2301 }
2302 }
2304 if (s.bars.show && !item) { // no other point can be nearby
2305 var barLeft = s.bars.align == "left" ? 0 : -s.bars.barWidth/2,
2306 barRight = barLeft + s.bars.barWidth;
2308 for (j = 0; j < points.length; j += ps) {
2309 var x = points[j], y = points[j + 1], b = points[j + 2];
2310 if (x == null)
2311 continue;
2313 // for a bar graph, the cursor must be inside the bar
2314 if (series[i].bars.horizontal ?
2315 (mx <= Math.max(b, x) && mx >= Math.min(b, x) &&
2316 my >= y + barLeft && my <= y + barRight) :
2317 (mx >= x + barLeft && mx <= x + barRight &&
2318 my >= Math.min(b, y) && my <= Math.max(b, y)))
2319 item = [i, j / ps];
2320 }
2321 }
2322 }
2324 if (item) {
2325 i = item[0];
2326 j = item[1];
2327 ps = series[i].datapoints.pointsize;
2329 return { datapoint: series[i].datapoints.points.slice(j * ps, (j + 1) * ps),
2330 dataIndex: j,
2331 series: series[i],
2332 seriesIndex: i };
2333 }
2335 return null;
2336 }
2338 function onMouseMove(e) {
2339 if (options.grid.hoverable)
2340 triggerClickHoverEvent("plothover", e,
2341 function (s) { return s["hoverable"] != false; });
2342 }
2344 function onMouseLeave(e) {
2345 if (options.grid.hoverable)
2346 triggerClickHoverEvent("plothover", e,
2347 function (s) { return false; });
2348 }
2350 function onClick(e) {
2351 triggerClickHoverEvent("plotclick", e,
2352 function (s) { return s["clickable"] != false; });
2353 }
2355 // trigger click or hover event (they send the same parameters
2356 // so we share their code)
2357 function triggerClickHoverEvent(eventname, event, seriesFilter) {
2358 var offset = eventHolder.offset(),
2359 canvasX = event.pageX - offset.left - plotOffset.left,
2360 canvasY = event.pageY - offset.top - plotOffset.top,
2361 pos = canvasToAxisCoords({ left: canvasX, top: canvasY });
2363 pos.pageX = event.pageX;
2364 pos.pageY = event.pageY;
2366 var item = findNearbyItem(canvasX, canvasY, seriesFilter);
2368 if (item) {
2369 // fill in mouse pos for any listeners out there
2370 item.pageX = parseInt(item.series.xaxis.p2c(item.datapoint[0]) + offset.left + plotOffset.left);
2371 item.pageY = parseInt(item.series.yaxis.p2c(item.datapoint[1]) + offset.top + plotOffset.top);
2372 }
2374 if (options.grid.autoHighlight) {
2375 // clear auto-highlights
2376 for (var i = 0; i < highlights.length; ++i) {
2377 var h = highlights[i];
2378 if (h.auto == eventname &&
2379 !(item && h.series == item.series &&
2380 h.point[0] == item.datapoint[0] &&
2381 h.point[1] == item.datapoint[1]))
2382 unhighlight(h.series, h.point);
2383 }
2385 if (item)
2386 highlight(item.series, item.datapoint, eventname);
2387 }
2389 placeholder.trigger(eventname, [ pos, item ]);
2390 }
2392 function triggerRedrawOverlay() {
2393 if (!redrawTimeout)
2394 redrawTimeout = setTimeout(drawOverlay, 30);
2395 }
2397 function drawOverlay() {
2398 redrawTimeout = null;
2400 // draw highlights
2401 octx.save();
2402 octx.clearRect(0, 0, canvasWidth, canvasHeight);
2403 octx.translate(plotOffset.left, plotOffset.top);
2405 var i, hi;
2406 for (i = 0; i < highlights.length; ++i) {
2407 hi = highlights[i];
2409 if (hi.series.bars.show)
2410 drawBarHighlight(hi.series, hi.point);
2411 else
2412 drawPointHighlight(hi.series, hi.point);
2413 }
2414 octx.restore();
2416 executeHooks(hooks.drawOverlay, [octx]);
2417 }
2419 function highlight(s, point, auto) {
2420 if (typeof s == "number")
2421 s = series[s];
2423 if (typeof point == "number") {
2424 var ps = s.datapoints.pointsize;
2425 point = s.datapoints.points.slice(ps * point, ps * (point + 1));
2426 }
2428 var i = indexOfHighlight(s, point);
2429 if (i == -1) {
2430 highlights.push({ series: s, point: point, auto: auto });
2432 triggerRedrawOverlay();
2433 }
2434 else if (!auto)
2435 highlights[i].auto = false;
2436 }
2438 function unhighlight(s, point) {
2439 if (s == null && point == null) {
2440 highlights = [];
2441 triggerRedrawOverlay();
2442 }
2444 if (typeof s == "number")
2445 s = series[s];
2447 if (typeof point == "number")
2448 point = s.data[point];
2450 var i = indexOfHighlight(s, point);
2451 if (i != -1) {
2452 highlights.splice(i, 1);
2454 triggerRedrawOverlay();
2455 }
2456 }
2458 function indexOfHighlight(s, p) {
2459 for (var i = 0; i < highlights.length; ++i) {
2460 var h = highlights[i];
2461 if (h.series == s && h.point[0] == p[0]
2462 && h.point[1] == p[1])
2463 return i;
2464 }
2465 return -1;
2466 }
2468 function drawPointHighlight(series, point) {
2469 var x = point[0], y = point[1],
2470 axisx = series.xaxis, axisy = series.yaxis;
2472 if (x < axisx.min || x > axisx.max || y < axisy.min || y > axisy.max)
2473 return;
2475 var pointRadius = series.points.radius + series.points.lineWidth / 2;
2476 octx.lineWidth = pointRadius;
2477 octx.strokeStyle = $.color.parse(series.color).scale('a', 0.5).toString();
2478 var radius = 1.5 * pointRadius,
2479 x = axisx.p2c(x),
2480 y = axisy.p2c(y);
2482 octx.beginPath();
2483 if (series.points.symbol == "circle")
2484 octx.arc(x, y, radius, 0, 2 * Math.PI, false);
2485 else
2486 series.points.symbol(octx, x, y, radius, false);
2487 octx.closePath();
2488 octx.stroke();
2489 }
2491 function drawBarHighlight(series, point) {
2492 octx.lineWidth = series.bars.lineWidth;
2493 octx.strokeStyle = $.color.parse(series.color).scale('a', 0.5).toString();
2494 var fillStyle = $.color.parse(series.color).scale('a', 0.5).toString();
2495 var barLeft = series.bars.align == "left" ? 0 : -series.bars.barWidth/2;
2496 drawBar(point[0], point[1], point[2] || 0, barLeft, barLeft + series.bars.barWidth,
2497 0, function () { return fillStyle; }, series.xaxis, series.yaxis, octx, series.bars.horizontal, series.bars.lineWidth);
2498 }
2500 function getColorOrGradient(spec, bottom, top, defaultColor) {
2501 if (typeof spec == "string")
2502 return spec;
2503 else {
2504 // assume this is a gradient spec; IE currently only
2505 // supports a simple vertical gradient properly, so that's
2506 // what we support too
2507 var gradient = ctx.createLinearGradient(0, top, 0, bottom);
2509 for (var i = 0, l = spec.colors.length; i < l; ++i) {
2510 var c = spec.colors[i];
2511 if (typeof c != "string") {
2512 var co = $.color.parse(defaultColor);
2513 if (c.brightness != null)
2514 co = co.scale('rgb', c.brightness)
2515 if (c.opacity != null)
2516 co.a *= c.opacity;
2517 c = co.toString();
2518 }
2519 gradient.addColorStop(i / (l - 1), c);
2520 }
2522 return gradient;
2523 }
2524 }
2525 }
2527 $.plot = function(placeholder, data, options) {
2528 //var t0 = new Date();
2529 var plot = new Plot($(placeholder), data, options, $.plot.plugins);
2530 //(window.console ? console.log : alert)("time used (msecs): " + ((new Date()).getTime() - t0.getTime()));
2531 return plot;
2532 };
2534 $.plot.version = "0.7";
2536 $.plot.plugins = [];
2538 // returns a string with the date d formatted according to fmt
2539 $.plot.formatDate = function(d, fmt, monthNames) {
2540 var leftPad = function(n) {
2541 n = "" + n;
2542 return n.length == 1 ? "0" + n : n;
2543 };
2545 var r = [];
2546 var escape = false, padNext = false;
2547 var hours = d.getUTCHours();
2548 var isAM = hours < 12;
2549 if (monthNames == null)
2550 monthNames = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
2552 if (fmt.search(/%p|%P/) != -1) {
2553 if (hours > 12) {
2554 hours = hours - 12;
2555 } else if (hours == 0) {
2556 hours = 12;
2557 }
2558 }
2559 for (var i = 0; i < fmt.length; ++i) {
2560 var c = fmt.charAt(i);
2562 if (escape) {
2563 switch (c) {
2564 case 'h': c = "" + hours; break;
2565 case 'H': c = leftPad(hours); break;
2566 case 'M': c = leftPad(d.getUTCMinutes()); break;
2567 case 'S': c = leftPad(d.getUTCSeconds()); break;
2568 case 'd': c = "" + d.getUTCDate(); break;
2569 case 'm': c = "" + (d.getUTCMonth() + 1); break;
2570 case 'y': c = "" + d.getUTCFullYear(); break;
2571 case 'b': c = "" + monthNames[d.getUTCMonth()]; break;
2572 case 'p': c = (isAM) ? ("" + "am") : ("" + "pm"); break;
2573 case 'P': c = (isAM) ? ("" + "AM") : ("" + "PM"); break;
2574 case '0': c = ""; padNext = true; break;
2575 }
2576 if (c && padNext) {
2577 c = leftPad(c);
2578 padNext = false;
2579 }
2580 r.push(c);
2581 if (!padNext)
2582 escape = false;
2583 }
2584 else {
2585 if (c == "%")
2586 escape = true;
2587 else
2588 r.push(c);
2589 }
2590 }
2591 return r.join("");
2592 };
2594 // round to nearby lower multiple of base
2595 function floorInBase(n, base) {
2596 return base * Math.floor(n / base);
2597 }
2599 })(jQuery);