Updates

examples/display/bitmapdata wobble.js

@@ -0,0 +1,77 @@
+
+var game = new Phaser.Game(800, 600, Phaser.AUTO, 'phaser-example', { preload: preload, create: create, update: update });
+
+function preload() {
+
+    game.load.image('ball', 'assets/sprites/shinyball.png');
+
+}
+
+var bmd;
+
+var waveSize = 8;
+var wavePixelChunk = 2;
+var waveData;
+var waveDataCounter;
+
+function create() {
+
+	//	Create our BitmapData object at a size of 32x64
+	bmd = game.add.bitmapData('ball', 32, 64);
+
+    //  And apply it to 100 randomly positioned sprites
+    for (var i = 0; i < 100; i++)
+    {
+        game.add.sprite(game.world.randomX, game.world.randomY, bmd);
+    }
+
+    //  Populate the wave with some data
+	waveData = game.math.sinCosGenerator(32, 8, 8, 2);
+
+}
+
+function update() {
+
+	//	Clear the BitmapData
+	bmd.clear();
+
+	updateWobblyBall();
+
+}
+
+//  This creates a simple sine-wave effect running through our BitmapData.
+//  This is then duplicated across all 100 sprites using it, meaning we only have to calculate it and upload it to the GPU once.
+
+function updateWobblyBall()
+{
+	var s = 0;
+	var copyRect = { x: 0, y: 0, w: wavePixelChunk, h: 32 };
+	var copyPoint = { x: 0, y: 0 };
+
+	for (var x = 0; x < 32; x += wavePixelChunk)
+	{
+		copyPoint.x = x;
+		copyPoint.y = waveSize + (waveSize / 2) + waveData.sin[s];
+
+		bmd.context.drawImage(game.cache.getImage('ball'), copyRect.x, copyRect.y, copyRect.w, copyRect.h, copyPoint.x, copyPoint.y, copyRect.w, copyRect.h);
+			
+		copyRect.x += wavePixelChunk;
+			
+		s++;
+	}
+
+	//	Now all the pixel data has been redrawn we render it to the BitmapData object.
+	//	In CANVAS mode this doesn't do anything, but on WebGL it pushes the new texture to the GPU.
+	//	If your game is exclusively running under Canvas you ca safely ignore this step.
+	bmd.render();
+
+	//	Cycle through the wave data - this is what causes the image to "undulate"
+	game.math.shift(waveData.sin);
+	
+	waveDataCounter++;
+	
+	if (waveDataCounter == waveData.length)
+	{
+		waveDataCounter = 0;
+	}
+}