third_party/WebKit/LayoutTests/fast/canvas/canvas-ellipse-circumference-fill.html

   1 <!DOCTYPE html>
   2 <html>
   3 <head></head>
   4 <body>
   5 <canvas id="mycanvas" width="600" height="480"></canvas>
   6 <script>
   7 if (window.testRunner)
   8     testRunner.dumpAsTextWithPixelResults();
   9
  10 var canvas = document.getElementById('mycanvas');
  11 var ctx = canvas.getContext('2d');
  12
  13 ctx.fillStyle = 'rgba(0, 0, 0, 0.5)';
  14
  15 // 20 angles.
  16 var sweepAngles = [
  17     -123.7, -2.3, -2, -1, -0.3, -0.000001, 0, 0.000001, 0.3, 0.7,
  18     1, 1.3, 1.5, 1.7, 1.99999, 2, 2.00001, 2.3, 4.3, 3934723942837.3
  19 ];
  20 for (var i = 0; i < sweepAngles.length; i++) {
  21     sweepAngles[i] = sweepAngles[i] * Math.PI;
  22 }
  23
  24 var startAngles = [
  25     -1, -0.5, 0, 0.5
  26 ]
  27 for (var i = 0; i < startAngles.length; i++) {
  28     startAngles[i] = startAngles[i] * Math.PI;
  29 }
  30
  31 var rotations = [
  32     Math.PI / 4, 0
  33 ]
  34
  35 var startAngle = 0;
  36 var anticlockwise = false;
  37 var sign = 1;
  38 var height = 30;
  39 for (var r = 0; r < rotations.length; r++) {
  40     ctx.save();
  41     for (var i = 0; i < startAngles.length * 2; i++) {
  42         if (i == startAngles.length) {
  43             anticlockwise = true;
  44             sign = -1;
  45         }
  46         startAngle = startAngles[i % startAngles.length] * sign;
  47         ctx.save();
  48         for (var j = 0; j < sweepAngles.length; j++) {
  49             ctx.save();
  50             ctx.beginPath();
  51             ctx.moveTo(0, 2);
  52             ctx.ellipse(18, 15, 8, 12, rotations[r], startAngle, startAngle + (sweepAngles[j] * sign), anticlockwise);
  53             ctx.lineTo(0, 28);
  54             ctx.fill();
  55             ctx.restore();
  56             ctx.translate(30, 0);
  57         }
  58         ctx.restore();
  59         ctx.translate(0, height);
  60     }
  61     ctx.restore();
  62     ctx.translate(0, height * startAngles.length * 2);
  63 }
  64
  65 </script>
  66 </body>
  67 </html>