setLineDash.html - mozsearch

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This WPT test may be referenced by the following Test IDs:
- /html/canvas/element/manual/line-styles/setLineDash.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset=utf-8>

<title>setLineDash</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="/html/canvas/resources/canvas-tests.js"></script>

<canvas id="canvas"></canvas>

<script>

test(function() {

  var canvas = document.getElementById('canvas');

  var ctx = canvas.getContext('2d');

  var initial = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

  ctx.setLineDash(initial);

  assert_array_equals(ctx.getLineDash(), initial, "line dash sanity");

  ctx.setLineDash([Infinity]);

  assert_array_equals(ctx.getLineDash(), initial, "Inf doesn't reset line dash");

  ctx.setLineDash([NaN]);

  assert_array_equals(ctx.getLineDash(), initial, "NaN doesn't reset line dash");

  ctx.setLineDash([-1]);

  assert_array_equals(ctx.getLineDash(), initial, "Negative doesn't reset line dash");

}, "Invalid arguments to setLineDash()");

test(function() {

  var canvas = document.getElementById('canvas');

  var ctx = canvas.getContext('2d');

  assert_equals(ctx.lineDashOffset, 0);

  ctx.setLineDash([15, 10]);

  ctx.lineDashOffset = 5;

  ctx.strokeRect(10,10,100,100);

  var lineDash = ctx.getLineDash();

  assert_array_equals(lineDash, [15, 10]);

  assert_equals(ctx.lineDashOffset, 5);

  ctx.setLineDash([5, 10, 15]);

  ctx.strokeRect(20, 20, 120, 120);

  lineDash = ctx.getLineDash();

  assert_array_equals(lineDash, [5, 10, 15, 5, 10, 15]);

  ctx.setLineDash(["1", 2]);

  lineDash = ctx.getLineDash();

  assert_array_equals(lineDash, [1, 2]);

  ctx.clearRect(0, 0, 700, 700);

  assert_equals(ctx.lineDashOffset, 5);

  ctx.setLineDash([20, 10]);

  ctx.lineDashOffset = 0;

  // Make the test immune to plaform anti-aliasing discrepancies.

  ctx.lineWidth = 4;

  ctx.strokeStyle = '#00FF00';

  ctx.strokeRect(10.5, 10.5, 30, 30);

  _assertPixel(canvas, 25, 10, 0, 255, 0, 255, 0);

  _assertPixel(canvas, 35, 10, 0, 0, 0, 0, 0);

  _assertPixel(canvas, 40, 25, 0, 255, 0, 255, 0);

  _assertPixel(canvas, 40, 35, 0, 0, 0, 0, 0);

  _assertPixel(canvas, 25, 40, 0, 255, 0, 255, 0);

  _assertPixel(canvas, 15, 40, 0, 0, 0, 0, 0);

  _assertPixel(canvas, 10, 25, 0, 255, 0, 255, 0);

  _assertPixel(canvas, 10, 15, 0, 0, 0, 0, 0);

  // Verify that lineDashOffset works as expected.

  ctx.lineDashOffset = 20;

  ctx.strokeRect(50.5, 10.5, 30, 30);

  _assertPixel(canvas, 55, 10, 0, 0, 0, 0, 0);

  _assertPixel(canvas, 65, 10, 0, 255, 0, 255, 0);

  _assertPixel(canvas, 80, 15, 0, 0, 0, 0, 0);

  _assertPixel(canvas, 80, 25, 0, 255, 0, 255, 0);

  _assertPixel(canvas, 75, 40, 0, 0, 0, 0, 0);

  _assertPixel(canvas, 65, 40, 0, 255, 0, 255, 0);

  _assertPixel(canvas, 50, 35, 0, 0, 0, 0, 0);

  _assertPixel(canvas, 50, 25, 0, 255, 0, 255, 0);

  // Verify negative lineDashOffset.

  ctx.lineDashOffset = -10;

  ctx.strokeRect(90.5, 10.5, 30, 30);

  _assertPixel(canvas, 95, 10, 0, 0, 0, 0, 0);

  _assertPixel(canvas, 105, 10, 0, 255, 0, 255, 0);

  _assertPixel(canvas, 120, 15, 0, 0, 0, 0, 0);

  _assertPixel(canvas, 120, 25, 0, 255, 0, 255, 0);

  _assertPixel(canvas, 115, 40, 0, 0, 0, 0, 0);

  _assertPixel(canvas, 105, 40, 0, 255, 0, 255, 0);

  _assertPixel(canvas, 90, 35, 0, 0, 0, 0, 0);

  _assertPixel(canvas, 90, 25, 0, 255, 0, 255, 0);

  // Ensure that all zeros or negative pattern does not cause error state in

  // context.

  ctx.setLineDash([0, 0]);

  ctx.strokeRect(130.5, 10.5, 10, 10);

  ctx.setLineDash([-1]);

  ctx.strokeRect(130.5, 10.5, 10, 10);

  _assertPixel(canvas, 135, 15, 0, 0, 0, 0, 0);

  ctx.fillStyle = '#00FF00';

  ctx.fillRect(130, 10, 10, 10);

  _assertPixel(canvas, 135, 15, 0, 255, 0, 255, 0);

});

</script>