May 2012
Intermediate to advanced
752 pages
20h 24m
English
Content preview from Core HTML5 Canvas: Graphics, Animation, and Game DevelopmentBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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9.2.2. The Ungame’s Game Loop
The ungame creates a Game instance and reimplements paintUnderSprites() and paintOverSprites(). The ungame doesn’t have any sprites, but the game engine invokes paintUnderSprites() and paintOverSprites() anyway, as shown in Example 9.11.
Example 9.11. Painting over and under sprites
var game = new Game('ungame', 'gameCanvas'), ...game.paintOverSprites = function () { paintNearCloud(game.context, 120, 20); paintNearCloud(game.context, game.context.canvas.width+120, 20);};game.paintUnderSprites = function () { // Background erased by game engine's clearScreen() if (!gameOver && livesLeft === 0) { over(); } else { paintSun(game.context); paintFarCloud(game ...
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