import flash.events.Event;
import flash.events.MouseEvent;

var ball:Ball=new Ball;
var drag:Boolean=false;
addChild(ball);
ball.x=stage.stageWidth*.5;
ball.y=stage.stageHeight*.5;
ball.gravity=5;ball.friction=.97;
var oldx:Number;var oldy:Number;
var vx:Number;var vy:Number;
var bounce=.9;

addEventListener("enterFrame",enterFrame);
stage.addEventListener("mouseDown",mouseDown);
stage.addEventListener("mouseUp",mouseUp);

function mouseDown(event:MouseEvent){
    drag=true;
}
function mouseUp(event:MouseEvent){
    drag=false;
    ball.vx=vx;
    ball.vy=vy;
}
function enterFrame(event:Event):void{
    if(drag){
        ball.x=mouseX;ball.y=mouseY;
        ball.vx=0;ball.vy=0;
        vx=ball.x-oldx;
        vy=ball.y-oldy;
        oldx=ball.x;
        oldy=ball.y;
    }else ball.update();

    if(ball.x+.5*ball.width>stage.stageWidth){
        ball.vx*=-bounce;ball.x=stage.stageWidth-.5*ball.width;
    }
    if(ball.y+.5*ball.height>stage.stageHeight){
        ball.vy*=-bounce;ball.y=stage.stageHeight-.5*ball.height;
    }
    if(ball.x-.5*ball.width<0){
        ball.vx*=-bounce;ball.x=.5*ball.width;
    }
    if(ball.y-.5*ball.height<0){
        ball.vy*=-bounce;ball.y=.5*ball.height;
    }
}