| <!DOCTYPE html> |
| <html> |
| <body> |
| <canvas id='output' width='200' height='400'></canvas> |
| <script id='myWorker' type='text/worker'> |
| self.onmessage = function(e) { |
| var aCanvas = new OffscreenCanvas(200, 400); |
| var ctx = aCanvas.getContext('2d'); |
| |
| ctx.beginPath(); |
| ctx.lineWidth = '10'; |
| ctx.strokeStyle = 'green'; |
| ctx.lineJoin = 'round'; |
| ctx.moveTo(15, 15); |
| ctx.lineTo(135, 15); |
| ctx.lineTo(70, 170); |
| ctx.closePath(); |
| ctx.stroke(); |
| |
| var path1 = new Path2D(); |
| path1.moveTo(150, 25); |
| path1.bezierCurveTo(10, 150, 10, 300, 100, 200); |
| ctx.strokeStyle = 'purple'; |
| ctx.setLineDash([ 10, 5 ]); |
| ctx.stroke(path1); |
| |
| ctx.fillStyle = 'red'; |
| ctx.beginPath() |
| ctx.arc(75, 325, 50, 0, Math.PI * 2, true); |
| ctx.arc(75, 325, 20, 0, Math.PI * 2, true); |
| ctx.fill("evenodd"); |
| |
| var image = aCanvas.transferToImageBitmap(); |
| self.postMessage(image, [image]); |
| }; |
| </script> |
| <script> |
| if (window.testRunner) { |
| testRunner.waitUntilDone(); |
| } |
| var blob = new Blob([document.getElementById('myWorker').textContent]); |
| var worker = new Worker(URL.createObjectURL(blob)); |
| worker.addEventListener('message', msg => { |
| var outputCtx = document.getElementById('output').getContext('imagebitmap'); |
| outputCtx.transferImageBitmap(msg.data); |
| if (window.testRunner) { |
| testRunner.notifyDone(); |
| } |
| }); |
| worker.postMessage(""); |
| </script> |
| </body> |
| </html> |