Chromium Code Reviews Chromium Code Reviews
Issue 18286007:
Fix edge case bugs of canvas arc. (Closed)
Base URL: https://chromium.googlesource.com/chromium/blink.git@ellipse| Index: LayoutTests/fast/canvas/canvas-arc-circumference.html |
| diff --git a/LayoutTests/fast/canvas/canvas-arc-circumference.html b/LayoutTests/fast/canvas/canvas-arc-circumference.html |
| new file mode 100644 |
| index 0000000000000000000000000000000000000000..b0309e21cf2ab5828dac3a474c32870a04634faa |
| --- /dev/null |
| +++ b/LayoutTests/fast/canvas/canvas-arc-circumference.html |
| @@ -0,0 +1,58 @@ |
| +<!DOCTYPE html> |
| +<html> |
| +<head></head> |
| +<body> |
| +<canvas id="mycanvas" width="600" height="400"></canvas> |
| +<script> |
| +if (window.testRunner) |
| + testRunner.dumpAsText(true); |
| + |
| +var canvas = document.getElementById('mycanvas'); |
| +var ctx = canvas.getContext('2d'); |
| + |
| +ctx.lineWidth = 3; |
| + |
| +// 20 angles. |
| +var sweepAngles = [ |
| + -123.7, -2.3, -2, -1, -0.3, -0.000001, 0, 0.000001, 0.3, 0.7, |
| + 1, 1.3, 1.5, 1.7, 1.99999, 2, 2.00001, 2.3, 4.3, 3934723942837.3 |
| +]; |
| +for (var i = 0; i < sweepAngles.length; i++) { |
| + sweepAngles[i] = sweepAngles[i] * Math.PI; |
| +} |
| + |
| +var startAngles = [ |
| + -1, -0.5, 0, 0.5 |
| +] |
| +for (var i = 0; i < startAngles.length; i++) { |
| + startAngles[i] = startAngles[i] * Math.PI; |
| +} |
| + |
|
dshwang
2013/07/10 16:53:02
Make canvas-arc-circumference.html cover 160 cases
Stephen White
2013/08/22 15:08:29
Please add a line to LayoutTests/TestExpectations
|
| +var startAngle = 0; |
| +var anticlockwise = false; |
| +var sign = 1; |
| +for (var i = 0; i < startAngles.length * 2; i++) { |
| + if (i == startAngles.length) { |
| + anticlockwise = true; |
| + sign = -1; |
| + } |
| + startAngle = startAngles[i % startAngles.length] * sign; |
| + ctx.save(); |
| + for (var j = 0; j < sweepAngles.length; j++) { |
| + ctx.save(); |
| + ctx.beginPath(); |
| + ctx.moveTo(0, 2); |
| + ctx.arc(18, 15, 10, startAngle, startAngle + (sweepAngles[j] * sign), anticlockwise); |
| + ctx.lineTo(0, 28); |
| + ctx.stroke(); |
| + ctx.restore(); |
| + ctx.translate(30, 0); |
| + } |
| + ctx.restore(); |
| + ctx.translate(0, 40); |
| +} |
| + |
| +</script> |
| +</body> |
| +</html> |
| + |
