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PlayN - One code, many platforms

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by Suyo » March 9th, 2012, 8:39 am

https://developers.google.com/playn/

PlayN is a framework made by Google, and is based on Java. The special thing is that PlayN comes with tools to compile that Java code on 5 different platforms - Java, HTML5, Flash, and if you want to go mobile, Android and iOS. It also has a very simple base code - here's a bouncing ball for you:

Code: Select all: public class MyGame implements Game { static final float GRAVITY = 64; ImageLayer layer; float px, py; float x, y; float vx, vy; float ax, ay; public void init() { Image img = assetManager().getImage("ball.png"); layer = graphics().createImageLayer(img); graphics().rootLayer().add(layer); x = graphics().width() / 2; y = graphics().height() / 2; ay = GRAVITY; } public void update(float delta) { // Save previous position for interpolation. px = x; py = y; // Update physics. delta /= 1000; vx += ax * delta; vy += ay * delta; x += vx * delta; y += vy * delta; } public void paint(float alpha) { // Interpolate current position. float x = (this.x * alpha) + (px * (1f - alpha)); float y = (this.y * alpha) + (py * (1f - alpha)); // Update the layer. layer.resetTransform(); layer.translate( x - layer.image().width() / 2, y - layer.image().height() / 2 ); } public int updateRate() { // 0 = max framerate return 0; } }