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/*Navigaiton Engine*/
/*Setup*/
var maxspeed:Number = 4;
var startAngle:Number = 0;
var steeringFriction:Number = .50;
var groundFriction:Number = .98;
var speed:Number = 0;
var steering:Number = 0;
var moveX:Number = 0;
var moveY:Number = 0;
var radiance:Number = ((startAngle-90)/180)*Math.PI;
//
/* Create Map */
var map_mc:MovieClip = this.attachMovie("map_mc","map_mc",this.getNextHighestDepth());
map_mc._x = 0
map_mc._y = 0
//
/* Create Player */
var player_ship_mc:MovieClip = this.attachMovie("player_ship_mc","player_ship_mc",this.getNextHighestDepth());
player_ship_mc._x = Stage.width/2;
player_ship_mc._y = Stage.height/2;
//
/* Main Game Loop */
player_ship_mc.onEnterFrame = function() {
	run();
};
function run():Void {
	if (speed<0) {
		speed = 0;
	}
	// left    
	if (Key.isDown(Key.LEFT)) {
		steering -= 0.2;
	}
	// right    
	if (Key.isDown(Key.RIGHT)) {
		steering += 0.2;
	}

	// maxsteering
	if (steering > 1.5){
	steering =  1.5;
	}
	if (steering < -1.5){
	steering = -1.5;
	}

	// accelerate
	if (Key.isDown(Key.UP) && speed<maxspeed) {
		speed += 0.5;
	}
	// brake    
	if (Key.isDown(Key.DOWN)) {
		speed *= 0.75;
	}
	// friction    
	speed *= groundFriction;
	// ideal changes
	var idealXMovement = speed*Math.cos(radiance);
	var idealYMovement = speed*Math.sin(radiance);
	// real change
	moveX += ((idealXMovement-moveX)*steeringFriction);
	moveY += ((idealYMovement-moveY)*steeringFriction);
	// update
	//trace("moveX "+moveX);
	//trace("moveY "+moveY);
	map_mc._x += moveX;
	map_mc._y += moveY;

	// rotate
	radiance += (steering*speed)*.025;
	player_ship_mc._rotation = radiance*180/Math.PI;
	steering -= (steering*0.1);
}