phaser/wip/phaser tests/sprites/mark of the bunny.js

/// <reference path="../../Phaser/Game.ts" />
(function () {
    var myGame = new Phaser.Game(this, 'game', 800, 600, init, create, update);
    function init() {
        myGame.loader.addImageFile('bunny', 'assets/sprites/wabbit.png');
        myGame.loader.load();
    }
    var maxX;
    var maxY;
    var minX;
    var minY;
    var fps;
    function create() {
        //  FPS counter TextArea
        fps = document.createElement('textarea');
        fps.style.width = '300px';
        fps.style.height = '100px';
        document.getElementById('game').appendChild(fps);
        minX = 0;
        minY = 0;
        maxX = myGame.stage.width - 26;
        maxY = myGame.stage.height - 37;
        addBunnies(500);
    }
    function addBunnies(quantity) {
        for(var i = 0; i < quantity; i++) {
            var tempSprite = myGame.add.sprite(myGame.stage.randomX, 0, 'bunny');
            tempSprite.velocity.x = -200 + (Math.random() * 400);
            tempSprite.velocity.y = 100 + Math.random() * 200;
        }
    }
    function update() {
        fps.textContent = 'Press Up to add more\n\nBunnies: ' + myGame.world.group.length + '\nFPS: ' + myGame.time.fps + ' (' + myGame.time.fpsMin + '-' + myGame.time.fpsMax + ')';
        myGame.world.group.forEach(checkWalls);
        if(myGame.input.keyboard.isDown(Phaser.Keyboard.UP)) {
            addBunnies(10);
        }
    }
    function checkWalls(bunny) {
        if(bunny.x > maxX) {
            bunny.velocity.x *= -1;
            bunny.x = maxX;
        } else if(bunny.x < minX) {
            bunny.velocity.x *= -1;
            bunny.x = minX;
        }
        if(bunny.y > maxY) {
            bunny.velocity.y *= -0.8;
            bunny.y = maxY;
        } else if(bunny.y < minY) {
            bunny.velocity.x = -200 + (Math.random() * 400);
            bunny.velocity.y = 100 + Math.random() * 200;
            bunny.y = minY;
        }
    }
})();