A Simple Game

/********************************************
 *      A Simple Game by Ian Guthridge      *
 ********************************************/

//total time since the game started
var ttlTime:Number = 0;
//time that has elapsed since the last frame
var elapsed:Number;
//sime since the last blocks dropped
var timeSinceDrop:Number =0;
var gameOver:Boolean = false;
var score:uint = 0;
var rate:Number = 1;
//hex color codes for our falling blocks
var colors:Array = [0xcccc00, 0xff8509, 0xcc0000, 0xcc00cc, 0x0066cc, 0x00cc66, 0x66cc00];
var nextBlock:int;

var fallingBlocks:Array = new Array();
//initialize
for(var j:int =0;j<3;j++){
    //Generate a random number
    nextBlock = int(Math.floor(.5+Math.random()*5));
    //create a new block
    var block:Box = new Box();
    var colorTransform:ColorTransform = block.transform.colorTransform;
    colorTransform.color = colors[nextBlock];
    block.transform.colorTransform = colorTransform;
    block.y = 30;
    block.x = int(Math.floor(.5+Math.random()*220))+10;
    fallingBlocks.push(block);
    addChild(block);
}

var player:Box = new Box();
colorTransform = player.transform.colorTransform;
colorTransform.color = 0x000000;
player.transform.colorTransform = colorTransform;
player.x = 130;
player.y = 470;
addChild(player);

this.addEventListener(Event.ENTER_FRAME, enterFunc);
//the next 2 event listeners must be addeed to the stage!
stage.addEventListener(KeyboardEvent.KEY_DOWN, checkKeyDown);
stage.addEventListener(KeyboardEvent.KEY_UP, checkKeyUp);
/*********************
 * Keyboard utilities*
 *********************/
//Aliases for the keycodes of the arrow keys. This will save on typing.
//Further, you could remap the keys without much work.
var left:int = Keyboard.LEFT;
var right:int = Keyboard.RIGHT;
var up:int = Keyboard.UP;
var down:int = Keyboard.DOWN;

//code for a fancy smancy input handler
var keyArray:Array = new Array();
//initialize array with "false" (in other words, no key is pressed)
for(var i:int =0;i<222;i++){
    keyArray.push(false);
}

function checkKeyDown(event:KeyboardEvent):void{
    keyArray[event.keyCode]=true;
}
function checkKeyUp(event:KeyboardEvent):void{
    keyArray[event.keyCode]=false;
}
function isKeyDown(keyCode:int):Boolean{
    return keyArray[keyCode];
}

/*********************
 *     Game Logic    *
 *********************/
function enterFunc(event:Event){
    /*The next few lines calculate how much time has elapsed
     *since the last frame. Flash should keep things at
     *clost to 30 fps, but we want to make sure nothing acts wacky*/
    var t:uint = getTimer();
    //convert to seconds
    elapsed = (t-ttlTime)/1000.0;
    ttlTime += elapsed*1000;
    if(!gameOver)
    {
        if(timeSinceDrop >= 2) {
            for(var j:int =0;j<3;j++){
                //Generate a random number
                nextBlock = int(Math.floor(.5+Math.random()*5));
                //create a new block
                var block:Box = new Box();
                var colorTransform:ColorTransform = block.transform.colorTransform;
                colorTransform.color = colors[nextBlock];
                block.transform.colorTransform = colorTransform;
                block.y = 30;
                block.x = int(Math.floor(.5+Math.random()*220))+10;
                fallingBlocks.push(block);
                addChild(block);
            }
            timeSinceDrop = 0;
        }
        else {
            timeSinceDrop += elapsed;
        }
        for(var i:int = 0; i < fallingBlocks.length; i++){
            if(fallingBlocks[i].hitTestObject(player)) gameOver = true;
            else if(fallingBlocks[i].y >=510) {
                removeChild(fallingBlocks[i]);
                fallingBlocks.splice(i,1);
            }
            else fallingBlocks[i].y += 20*rate*elapsed;
        }
        if(isKeyDown(left) && player.x >= 10) player.x -= 100*elapsed; //move left at 40 pixels a second
        if(isKeyDown(right) && player.x <= 230) player.x += 100*elapsed; //move left at 40 pixels a second
        if(player.x < 10) player.x = 10;
        else if(player.x > 230) player.x = 230;
        if(isKeyDown(up) && player.y >= 310) player.y -= 100*elapsed; //move left at 40 pixels a second
        if(isKeyDown(down) && player.y <= 490) player.y += 100*elapsed; //move left at 40 pixels a second
        if(player.y < 310) player.y = 310;
        else if(player.y > 490) player.y = 490;
        score++;
        rate += .001;
    }
}