1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 var ballRadius; 6 var ballGradient; 7 var segmentCount = 20; 8 9 function drawBallInit(diameter) { 10 ballRadius = diameter / 2; 11 ballGradient = canvasContext.createRadialGradient(0, 0, 0, 0, 0, ballRadius); 12 ballGradient.addColorStop(0, "#4040FF"); 13 ballGradient.addColorStop(1, "#00FF40"); 14 } 15 16 function drawBall(x, y, angle) { 17 canvasContext.save(); 18 canvasContext.fillStyle = ballGradient; 19 canvasContext.translate(x, y); 20 canvasContext.rotate(angle); 21 canvasContext.beginPath(); 22 canvasContext.moveTo(ballRadius, 0); 23 for (var i = 1; i < segmentCount; ++i) { 24 var angle = i * 2.0 * Math.PI / segmentCount; 25 canvasContext.lineTo(ballRadius*Math.cos(angle), 26 ballRadius*Math.sin(angle)); 27 } 28 canvasContext.fill(); 29 canvasContext.closePath(); 30 canvasContext.restore(); 31 } 32
