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Code Snippets :

Pong Game

					
import flash.events.Event;

//variables
var ballXSpeed:Number = 10;
var ballYSpeed:Number = 10;

var enemySpeed:Number = 5;

var player_score:Number = 0;
var enemy_score:Number = 0;

//the starting functions
function start():void{
	//add a listener to the paddle every frame
	player.addEventListener(Event.ENTER_FRAME, movePaddle);
	//add a listener to the ball every frame
	ball.addEventListener(Event.ENTER_FRAME, moveBall);
	//add a listener to the enemy paddle every frame
	enemy.addEventListener(Event.ENTER_FRAME, moveEnemy);
}

//the move paddle function
function movePaddle(event:Event):void{
	//the paddle follows the mouse
	player.x = mouseX;
}

//the move enemy ai
function moveEnemy(event:Event):void{
	//the enemy follows the ball
	if(enemy.x < ball.x - 10){
		enemy.x += enemySpeed;
	}else if(enemy.x > ball.x + 10){
		enemy.x -= enemySpeed;
	}
	//with a slight margin of error
}

//the move ball function
function moveBall(event:Event):void{
	//check if ball hits paddle
	if(ball.hitTestObject(player)){
		calcBallAngle();
	}
	//check if ball hits enemy
	if(ball.hitTestObject(enemy)){
		calcBallAngle();
	}
	//bouncing the ball off the walls
	if(ball.x >= stage.stageWidth-ball.width){
		ballXSpeed *= -1;
	}
	if(ball.x <= 0){
		ballXSpeed *= -1;
	}
	if(ball.y >= stage.stageHeight-ball.height){
		//ballYSpeed *= -1;
		enemy_score++;
		ballXSpeed = -10;
		ballYSpeed = -10;
	}
	if(ball.y <= 0){
		//ballYSpeed *= -1;
		player_score++;
		ballXSpeed = 10;
		ballYSpeed = 10;
	}
	//update position by speed
	ball.x += ballXSpeed;
	ball.y += ballYSpeed;
	//update score
	playerScore.text = "Score: " + player_score;
	enemyScore.text = "Score: " + enemy_score;
}

//the function to calculate ball angles
function calcBallAngle():void{
	//lets grab the position of the ball on the paddle
	var ballPos:Number = ball.x - player.x;
	var hitPercent:Number = (ballPos / (player.width - ball.width)) - .5;
	ballXSpeed = hitPercent * 5;
	ballYSpeed *= -1;
}

//start the code
start();