content/canvas/test/test_2d.line.width.transformed.html

   1 <!DOCTYPE HTML>
   2 <title>Canvas test: 2d.line.width.transformed</title>
   3 <!-- Testing: Line stroke widths are affected by scale transformations -->
   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 ctx.lineWidth = 4;
  33 // Draw a green line over a red box, to check the line is not too small
  34 ctx.fillStyle = '#f00';
  35 ctx.strokeStyle = '#0f0';
  36 ctx.fillRect(15, 15, 20, 20);
  37 ctx.save();
  38  ctx.scale(5, 1);
  39  ctx.beginPath();
  40  ctx.moveTo(5, 15);
  41  ctx.lineTo(5, 35);
  42  ctx.stroke();
  43 ctx.restore();
  44
  45 // Draw a green box over a red line, to check the line is not too large
  46 ctx.fillStyle = '#0f0';
  47 ctx.strokeStyle = '#f00';
  48 ctx.save();
  49  ctx.scale(-5, 1);
  50  ctx.beginPath();
  51  ctx.moveTo(-15, 15);
  52  ctx.lineTo(-15, 35);
  53  ctx.stroke();
  54 ctx.restore();
  55 ctx.fillRect(65, 15, 20, 20);
  56
  57 isPixel(ctx, 14,25, 0,255,0,255, "14,25", "0,255,0,255", 0);
  58 isPixel(ctx, 15,25, 0,255,0,255, "15,25", "0,255,0,255", 0);
  59 isPixel(ctx, 16,25, 0,255,0,255, "16,25", "0,255,0,255", 0);
  60 isPixel(ctx, 25,25, 0,255,0,255, "25,25", "0,255,0,255", 0);
  61 isPixel(ctx, 34,25, 0,255,0,255, "34,25", "0,255,0,255", 0);
  62 isPixel(ctx, 35,25, 0,255,0,255, "35,25", "0,255,0,255", 0);
  63 isPixel(ctx, 36,25, 0,255,0,255, "36,25", "0,255,0,255", 0);
  64
  65 isPixel(ctx, 64,25, 0,255,0,255, "64,25", "0,255,0,255", 0);
  66 isPixel(ctx, 65,25, 0,255,0,255, "65,25", "0,255,0,255", 0);
  67 isPixel(ctx, 66,25, 0,255,0,255, "66,25", "0,255,0,255", 0);
  68 isPixel(ctx, 75,25, 0,255,0,255, "75,25", "0,255,0,255", 0);
  69 isPixel(ctx, 84,25, 0,255,0,255, "84,25", "0,255,0,255", 0);
  70 isPixel(ctx, 85,25, 0,255,0,255, "85,25", "0,255,0,255", 0);
  71 isPixel(ctx, 86,25, 0,255,0,255, "86,25", "0,255,0,255", 0);
  72
  73 SimpleTest.finish();
  74
  75 });
  76 </script>
  77