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 ballImage; 6 var ballRadius; 7 8 function drawBallInit(diameter) { 9 ballRadius = diameter / 2; 10 ballImage = document.getElementById('ballImage'); 11 } 12 13 function drawBall(x, y, angle) { 14 canvasContext.save(); 15 canvasContext.shadowColor = 'black'; 16 canvasContext.shadowOffsetX = -ballRadius; 17 canvasContext.shadowOffsetY = ballRadius; 18 canvasContext.shadowBlur = ballRadius; 19 canvasContext.translate(x, y); 20 canvasContext.rotate(angle); 21 canvasContext.drawImage(ballImage, -ballRadius, -ballRadius, ballDiameter, 22 ballDiameter); 23 canvasContext.restore(); 24 } 25
