dom/svg/test/test_text_lengthAdjust.html

   1 <!DOCTYPE html>
   2 <html>
   3 <!--
   4 https://bugzilla.mozilla.org/show_bug.cgi?id=569722
   5 -->
   6 <head>
   7   <meta charset=UTF-8>
   8   <title>Test for Bug 569722</title>
   9   <script src="/tests/SimpleTest/SimpleTest.js"></script>
  10   <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
  11 </head>
  12 <body>
  13 <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=569722">Mozilla Bug 569722</a>
  14 <p id="display"></p>
  15 <div id="content">
  16   <svg width="400" height="200">
  17     <text x="0" y="100" style="font: 16px sans-serif">aaa</text>
  18   </svg>
  19 </div>
  20
  21 <pre id="test">
  22 <script class="testbody" type="application/javascript">
  23 SimpleTest.waitForExplicitFinish();
  24
  25 function close(x, y, message) {
  26   ok(Math.abs(x - y) < 1e-4, message);
  27 }
  28
  29 function runTest() {
  30   var text = document.querySelector("text");
  31
  32   // get the original length
  33   var length = text.getComputedTextLength();
  34
  35   // get the original glyph positions
  36   var startPositions = [],
  37       endPositions = [],
  38       extents = [];
  39   for (let i = 0; i < 3; i++) {
  40     startPositions.push(text.getStartPositionOfChar(i));
  41     endPositions.push(text.getEndPositionOfChar(i));
  42     extents.push(text.getExtentOfChar(i));
  43   }
  44
  45   // widths should all be the same
  46   is(extents[0].width, extents[1].width);
  47   is(extents[0].width, extents[2].width);
  48
  49   var checkCharNumAtPosition = function(x, y, i) {
  50     var p = document.querySelector("svg").createSVGPoint();
  51     p.x = x;
  52     p.y = y;
  53     is(text.getCharNumAtPosition(p), i, "getCharNumAtPosition(" + i + ")");
  54   };
  55
  56   var checkPositions = function(start, end, width) {
  57     for (let i = 0; i < 3; i++) {
  58       // check their positions
  59       close(text.getStartPositionOfChar(i).x, start[i], "start position of glyph " + i);
  60       close(text.getEndPositionOfChar(i).x, end[i], "end position of glyph " + i);
  61       close(text.getExtentOfChar(i).x, start[i], "left edge of extent of glyph " + i);
  62       close(text.getExtentOfChar(i).width, width, "width of glyph " + i);
  63       checkCharNumAtPosition((start[i] + end[i]) / 2, 100, i);
  64     }
  65   };
  66
  67   var w = extents[0].width;
  68
  69   var doLengthAdjustSpacingTest = function() {
  70     // getComputedTextLength should return the sum of the advances, and since
  71     // we are just changing the positions of the glyphs, it should be the same
  72     // as without a textLength="" attribute
  73     close(text.getComputedTextLength(), length, "getComputedTextLength when lengthAdjust=\"spacing\"");
  74
  75     // expected start and end positions of the glyphs
  76     var start = [0, 50 - w / 2, 100 - w];
  77     var end = [w, 50 + w / 2, 100];
  78     checkPositions(start, end, w);
  79   };
  80
  81   // switch to adjust glyph positions, using the default value of lengthAdjust=""
  82   text.setAttribute("textLength", "100");
  83   doLengthAdjustSpacingTest();
  84   // then with an explicit lengthAdjust="spacing"
  85   text.setAttribute("lengthAdjust", "spacing");
  86   doLengthAdjustSpacingTest();
  87
  88   // now test with lengthAdjust="spacingAndGlyphs"
  89   text.setAttribute("lengthAdjust", "spacingAndGlyphs");
  90
  91   // now that each glyph is stretched, the total advance should be the textLength
  92   close(text.getComputedTextLength(), 100, "getComputedTextLength when lengthAdjust=\"spacingAndGlyphs\"");
  93
  94   // expected start and end positions of the glyphs
  95   var start = [0, 33.3333, 66.6666];
  96   var end = [33.3333, 66.6666, 100];
  97   checkPositions(start, end, 33.3333);
  98
  99   SimpleTest.finish();
 100 }
 101
 102 window.addEventListener("load", runTest);
 103 </script>
 104 </pre>
 105 </body>
 106 </html>