content/canvas/test/test_2d.line.cap.round.html

   1 <!DOCTYPE HTML>
   2 <title>Canvas test: 2d.line.cap.round</title>
   3 <!-- Testing: lineCap 'round' is rendered correctly -->
   4 <script src="/MochiKit/MochiKit.js"></script>
   5 <script src="/tests/SimpleTest/SimpleTest.js"></script>
   6 <link rel="stylesheet" href="/tests/SimpleTest/test.css">
   7 <body>
   8 <canvas id="c" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
   9 <script>
  10 function isPixel(ctx, x,y, r,g,b,a, pos, colour, d) {
  11     var pixel = ctx.getImageData(x, y, 1, 1);
  12     var pr = pixel.data[0],
  13         pg = pixel.data[1],
  14         pb = pixel.data[2],
  15         pa = pixel.data[3];
  16     ok(r-d <= pr && pr <= r+d &&
  17        g-d <= pg && pg <= g+d &&
  18        b-d <= pb && pb <= b+d &&
  19        a-d <= pa && pa <= a+d,
  20        "pixel "+pos+" is "+pr+","+pg+","+pb+","+pa+"; expected "+colour+" +/- "+d);
  21 }
  22
  23 SimpleTest.waitForExplicitFinish();
  24 MochiKit.DOM.addLoadEvent(function () {
  25
  26 var canvas = document.getElementById('c');
  27 var ctx = canvas.getContext('2d');
  28
  29 ctx.fillStyle = '#0f0';
  30 ctx.fillRect(0, 0, 100, 50);
  31
  32 var tol = 1; // tolerance to avoid antialiasing artifacts
  33
  34 ctx.lineCap = 'round';
  35 ctx.lineWidth = 20;
  36
  37
  38 ctx.fillStyle = '#f00';
  39 ctx.strokeStyle = '#0f0';
  40
  41 ctx.beginPath();
  42 ctx.moveTo(35-tol, 15);
  43 ctx.arc(25, 15, 10-tol, 0, Math.PI, true);
  44 ctx.arc(25, 35, 10-tol, Math.PI, 0, true);
  45 ctx.fill();
  46
  47 ctx.beginPath();
  48 ctx.moveTo(25, 15);
  49 ctx.lineTo(25, 35);
  50 ctx.stroke();
  51
  52
  53 ctx.fillStyle = '#0f0';
  54 ctx.strokeStyle = '#f00';
  55
  56 ctx.beginPath();
  57 ctx.moveTo(75, 15);
  58 ctx.lineTo(75, 35);
  59 ctx.stroke();
  60
  61 ctx.beginPath();
  62 ctx.moveTo(85+tol, 15);
  63 ctx.arc(75, 15, 10+tol, 0, Math.PI, true);
  64 ctx.arc(75, 35, 10+tol, Math.PI, 0, true);
  65 ctx.fill();
  66
  67 isPixel(ctx, 17,6, 0,255,0,255, "17,6", "0,255,0,255", 0);
  68 isPixel(ctx, 25,6, 0,255,0,255, "25,6", "0,255,0,255", 0);
  69 isPixel(ctx, 32,6, 0,255,0,255, "32,6", "0,255,0,255", 0);
  70 isPixel(ctx, 17,43, 0,255,0,255, "17,43", "0,255,0,255", 0);
  71 isPixel(ctx, 25,43, 0,255,0,255, "25,43", "0,255,0,255", 0);
  72 isPixel(ctx, 32,43, 0,255,0,255, "32,43", "0,255,0,255", 0);
  73
  74 isPixel(ctx, 67,6, 0,255,0,255, "67,6", "0,255,0,255", 0);
  75 isPixel(ctx, 75,6, 0,255,0,255, "75,6", "0,255,0,255", 0);
  76 isPixel(ctx, 82,6, 0,255,0,255, "82,6", "0,255,0,255", 0);
  77 isPixel(ctx, 67,43, 0,255,0,255, "67,43", "0,255,0,255", 0);
  78 isPixel(ctx, 75,43, 0,255,0,255, "75,43", "0,255,0,255", 0);
  79 isPixel(ctx, 82,43, 0,255,0,255, "82,43", "0,255,0,255", 0);
  80
  81 SimpleTest.finish();
  82
  83 });
  84 </script>
  85