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| OLD | NEW |
|---|---|
| (Empty) | |
| 1 <!DOCTYPE html> | |
| 2 <html> | |
| 3 <head></head> | |
| 4 <body> | |
| 5 <canvas id="mycanvas" width="600" height="400"></canvas> | |
| 6 <script> | |
| 7 if (window.testRunner) | |
| 8 testRunner.dumpAsText(true); | |
| 9 | |
| 10 var canvas = document.getElementById('mycanvas'); | |
| 11 var ctx = canvas.getContext('2d'); | |
| 12 | |
| 13 ctx.lineWidth = 3; | |
| 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 | |
|
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
| |
| 31 var startAngle = 0; | |
| 32 var anticlockwise = false; | |
| 33 var sign = 1; | |
| 34 for (var i = 0; i < startAngles.length * 2; i++) { | |
| 35 if (i == startAngles.length) { | |
| 36 anticlockwise = true; | |
| 37 sign = -1; | |
| 38 } | |
| 39 startAngle = startAngles[i % startAngles.length] * sign; | |
| 40 ctx.save(); | |
| 41 for (var j = 0; j < sweepAngles.length; j++) { | |
| 42 ctx.save(); | |
| 43 ctx.beginPath(); | |
| 44 ctx.moveTo(0, 2); | |
| 45 ctx.arc(18, 15, 10, startAngle, startAngle + (sweepAngles[j] * sign), an ticlockwise); | |
| 46 ctx.lineTo(0, 28); | |
| 47 ctx.stroke(); | |
| 48 ctx.restore(); | |
| 49 ctx.translate(30, 0); | |
| 50 } | |
| 51 ctx.restore(); | |
| 52 ctx.translate(0, 40); | |
| 53 } | |
| 54 | |
| 55 </script> | |
| 56 </body> | |
| 57 </html> | |
| 58 | |
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