New labs demo. Added moveForward and moveBackward to Body.

labs/code/008 cannon balls.js

@@ -0,0 +1,76 @@
+
+var game = new Phaser.Game(800, 600, Phaser.AUTO, 'phaser-example', { preload: preload, create: create, update: update, render: render });
+
+function preload() {
+
+    game.load.image('arrow', 'assets/sprites/arrow.png');
+    game.load.image('chunk', 'assets/sprites/chunk.png');
+    game.load.spritesheet('bullets', 'assets/sprites/balls.png', 17, 17);
+
+}
+
+var cannon;
+var bullets;
+var angle = 0;
+var fireRate = 100;
+var nextFire = 0;
+
+function create() {
+
+    game.stage.backgroundColor = '#2d2d2d';
+
+    game.physics.gravity[1] = -8.5;
+    game.physics.defaultRestitution = 0.8;
+    game.physics.defaultFriction = 0.1;
+
+    bullets = game.add.group();
+    bullets.createMultiple(500, 'bullets', 0, false);
+
+    cannon = game.add.sprite(50, 500, 'arrow');
+    cannon.anchor.set(0, 0.5);
+
+}
+
+function fire() {
+
+    if (game.time.now > nextFire)
+    {
+        nextFire = game.time.now + fireRate;
+
+    	var bullet = bullets.getFirstExists(false);
+
+        if (bullet)
+        {
+            bullet.frame = game.rnd.integerInRange(0,6);
+            bullet.exists = true;
+            bullet.position.set(cannon.x, cannon.y);
+            bullet.physicsEnabled = true;
+
+            bullet.body.rotation = cannon.rotation + game.math.degToRad(90);
+
+            var magnitude = game.math.px2p(-500);
+            var angle = bullet.body.rotation + Math.PI / 2;
+
+            bullet.body.velocity.x = magnitude * Math.cos(angle);
+            bullet.body.velocity.y = magnitude * Math.sin(angle);
+        }
+    }
+
+}
+
+function update() {
+
+    var dx = game.input.activePointer.worldX - cannon.x;
+    var dy = game.input.activePointer.worldY - cannon.y;
+    cannon.rotation = Math.atan2(dy, dx);
+
+    if (game.input.activePointer.isDown)
+    {
+        fire();
+    }
+
+}
+
+function render() {
+
+}