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.translate(x, y); 16 canvasContext.rotate(angle); 17 canvasContext.drawImage(ballImage, -ballRadius, -ballRadius, ballDiameter, 18 ballDiameter); 19 canvasContext.restore(); 20 } 21
