//Main Game Script

//Global variables
var xVelocity=0;		// pc's x velocity
var yVelocity=0;		// pc's y velocity
var acceleration=2;		// pc's acceleration due to arrow key
var depth=1001;		//  display depth for platforms;  starts at 1
var platforms = new Array();  // platform data


//initialisation code
theLevel = new XML();
theLevel.ignoreWhite=true;
theLevel.onLoad=parseLevel;
theLevel.load("level0.xml");
imMask._visible = false;
imScene.setMask(imMask);

function parseLevel() {
	trace("Read level description.");
	var p=theLevel.childNodes[0];
	
	//set up the background
	imScene.attachMovie(p.attributes.backgroundClip,"i"+p.attributes.backgroundClip,0);
	
	
	//set up the player's character(pc)
	imPC._x=Number(p.attributes.xStart);
	imPC._y=Number(p.attributes.yStart);
	imPC.swapDepths(1000);
	
	trace(imPC._x);
	trace(imPC._y);
	
	// set up the platforms
	var q=p.childNodes[0];
	parsePlatforms(q);	
}

//functions
onEnterFrame=function () {

	checkInput();
	imScene._x -= xVelocity;
	imScene._y -= yVelocity;
	
}

function checkInput() {
	if(Key.isDown(Key.RIGHT)) {
		xVelocity += acceleration;
		}

	if (Key.isDown(Key.LEFT)) {
		xVelocity -= acceleration;
	}
	
	if (Key.isDown(Key.UP)) {
		yVelocity -= acceleration;
	}
	
	if (Key.isDown(Key.DOWN)) {
		yVelocity += acceleration;
	}
}

function Platform(x,y,w,h,v,clip,clipName) {
	this._x = x;
	this._y = y;
	this._width = w;
	this._height = h;
	this._visible = v;
	this._clip = clip;
	this._clipName = clipName;
	this.swapDepths(1000);
	trace("Platform func ("+this._x+","+this._y+")");
}


function parsePlatforms(p) {
	numPlatforms=p.childNodes.length;
	for (var i=0;i<numPlatforms;i++) {	
		platforms[i] = new Platform(
				Number(p.childNodes[i].attributes.x),
				Number(p.childNodes[i].attributes.y),
				Number(p.childNodes[i].attributes.w),
				Number(p.childNodes[i].attributes.h),
				Boolean(p.childNodes[i].attributes.v=="true"),
				p.childNodes[i].attributes.clip,
				"i"+p.childNodes[i].attributes.clip+i);
		theClip = imScene.attachMovie(platforms[i]._clip,platforms[i]._name,depth);
		depth++;
		theClip._x = platforms[i]._x;
		theClip._y = platforms[i]._y;
		theClip._height = platforms[i]._height;
		theClip._width = platforms[i]._width;
		theClip._visible = platforms[i]._visible;
	}
}