tools/deep_memory_profiler/visualizer/static/graph-view.js

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 /**
   6  * This is a view class showing flot graph.
   7  * @param {Object} profiler Must have addListener method.
   8  * @construct
   9  */
  10 var GraphView = function(profiler) {
  11   this.profiler_ = profiler;
  12   this.placeholder_ = '#graph-div';
  13   // Update graph view and menu view when profiler model changed.
  14   profiler.addListener('changed', this.redraw_.bind(this));
  15 };
  16
  17 /**
  18  * Generate lines for flot plotting.
  19  * @param {Array.<Object>} models
  20  * @return {Array.<Object>}
  21  * @private
  22  */
  23 GraphView.prototype.generateLines_ = function(models) {
  24   function mergeCategoryTree(snapNode, treeNode) {
  25     if ('children' in snapNode) {
  26       // If |snapNode| is not a leaf node, we should go deeper.
  27       if (!('children' in treeNode))
  28         treeNode.children = {};
  29       snapNode.children.forEach(function(child) {
  30         if (!(child.id in treeNode.children))
  31           treeNode.children[child.id] = {};
  32         mergeCategoryTree(child, treeNode.children[child.id]);
  33       });
  34     } else {
  35       treeNode.name = snapNode.name;
  36     }
  37   }
  38
  39   function getCategoriesMap(node, id, categories) {
  40     if ('children' in node) {
  41       Object.keys(node.children).forEach(function(id) {
  42         getCategoriesMap(node.children[id], id, categories);
  43       });
  44     } else {
  45       if (!(id in categories)) {
  46         categories[id] = {
  47           name: node.name,
  48           data: []
  49         };
  50         for (var i = 0; i < models.length; ++i)
  51           categories[id].data.push([models[i].time - models[0].time, 0]);
  52       }
  53     }
  54   }
  55
  56   function getLineValues(snapNode, index, categories) {
  57     if ('children' in snapNode) {
  58       snapNode.children.forEach(function(child) {
  59         getLineValues(child, index, categories);
  60       });
  61     } else {
  62       categories[snapNode.id].data[index][1] = snapNode.size;
  63     }
  64   }
  65
  66   // TODO(dmikurube): Remove this function after adding "color" attribute
  67   //     in each category.
  68   function getHashColorCode(id) {
  69     var color = 0;
  70     for (var i = 0; i < id.length; ++i)
  71       color = (color * 0x57 + id.charCodeAt(i)) & 0xffffff;
  72     color = color.toString(16);
  73     while (color.length < 6)
  74       color = '0' + color;
  75     return '#' + color;
  76   }
  77
  78   var categoryTree = {};
  79   models.forEach(function(model) {
  80     mergeCategoryTree(model, categoryTree);
  81   });
  82   // Convert layout of categories from tree style to hash map style.
  83   var categoryMap = {};
  84   getCategoriesMap(categoryTree, '', categoryMap);
  85   // Get size of each category.
  86   models.forEach(function(model, index) {
  87     getLineValues(model, index, categoryMap);
  88   });
  89
  90   return Object.keys(categoryMap).map(function(id) {
  91     return {
  92       color: getHashColorCode(id),
  93       data: categoryMap[id].data,
  94       id: id,
  95       label: categoryMap[id].name
  96     };
  97   });
  98 };
  99
 100 /**
 101  * Update graph view when model updated.
 102  * TODO(junjianx): use redraw function to improve perfomance.
 103  * @param {Array.<Object>} models
 104  * @private
 105  */
 106 GraphView.prototype.redraw_ = function(models) {
 107   var self = this;
 108   var data = this.generateLines_(models);
 109   if (!this.graph_) {
 110     var $graph = $(this.placeholder_);
 111     this.graph_ = $.plot($graph, data, {
 112       series: {
 113         stack: true,
 114         lines: { show: true, fill: true }
 115       },
 116       grid: {
 117         hoverable: true,
 118         clickable: true
 119       }
 120     });
 121
 122     // Bind click event so that user can select category by clicking stack
 123     // area. It firstly checks x range which clicked point is in, and all lines
 124     // share same x values, so it is checked only once at first. Secondly, it
 125     // checked y range by accumulated y values because this is a stack graph.
 126     $graph.bind('plotclick', function(event, pos, item) {
 127       // Get newest lines data from graph.
 128       var lines = self.graph_.getData();
 129       // If only <=1 line exists or axis area clicked, return.
 130       var right = binarySearch.call(lines[0].data.map(function(point) {
 131         return point[0];
 132       }), pos.x);
 133       if (lines.length <= 1 || right === lines.length || right === 0)
 134         return;
 135
 136       // Calculate interpolate y value of every line.
 137       for (var i = 0; i < lines.length; ++i) {
 138         var line = lines[i].data;
 139         // [left, right] is the range including clicked point.
 140         var left = right - 1;
 141         var leftPoint = {
 142           x: line[left][0],
 143           y: (leftPoint ? leftPoint.y : 0) + line[left][1]
 144         };
 145         var rightPoint = {
 146           x: line[right][0],
 147           y: (rightPoint ? rightPoint.y : 0) + line[right][1]
 148         };
 149
 150         // Calculate slope of the linear equation.
 151         var slope = (rightPoint.y - leftPoint.y) / (rightPoint.x - leftPoint.x);
 152         var interpolateY = slope * (pos.x - rightPoint.x) + rightPoint.y;
 153         if (interpolateY >= pos.y)
 154           break;
 155       }
 156
 157       // If pos.y is higher than all lines, return.
 158       if (i === lines.length) {
 159         self.profiler_.setSelected(null);
 160         return;
 161       }
 162
 163       self.profiler_.setSelected(lines[i].id, pos);
 164     });
 165   } else {
 166     this.graph_.setData(data);
 167     this.graph_.setupGrid();
 168     this.graph_.draw();
 169   }
 170 };