topical media & game development
animation-ch19-TimeBased.ax
animation-ch19-TimeBased.ax
[swf]
[flash]
flex
package
{
import flash.display.Sprite;
import flash.display.StageAlign;
import flash.display.StageScaleMode;
import flash.events.Event;
import flash.utils.getTimer;
public class @ax-animation-ch19-TimeBased extends Sprite
{
private var ball:animation_ch19_Ball;
private var vx:Number;
private var vy:Number;
private var bounce:Number = -0.7;
private var time:Number;
private var gravity:Number = 450;
public function @ax-animation-ch19-TimeBased()
{
init();
}
init(s)
private function init():void
{
stage.scaleMode = StageScaleMode.NO_SCALE;
stage.align=StageAlign.TOP_LEFT;
stage.frameRate = 100;
ball = new animation_ch19_Ball();
ball.x = stage.stageWidth / 2;
ball.y = stage.stageHeight / 2;
vx = 300;
vy = -300;
addChild(ball);
time = getTimer();
addEventListener(Event.ENTER_FRAME, onEnterFrame);
}
frame(s)
private function onEnterFrame(event:Event):void
{
var elapsed:Number = getTimer() - time;
time = getTimer();
vy += gravity * elapsed / 1000;
ball.x += vx * elapsed / 1000;
ball.y += vy * elapsed / 1000;
var left:Number = 0;
var right:Number = stage.stageWidth;
var top:Number = 0;
var bottom:Number = stage.stageHeight;
process
if(ball.x + ball.radius > right)
{
ball.x = right - ball.radius;
vx *= bounce;
}
else if(ball.x - ball.radius < left)
{
ball.x = left + ball.radius;
vx *= bounce;
}
if(ball.y + ball.radius > bottom)
{
ball.y = bottom - ball.radius;
vy *= bounce;
}
else if(ball.y - ball.radius < top)
{
ball.y = top + ball.radius;
vy *= bounce;
}
}
}
}
(C) Æliens
04/09/2009
You may not copy or print any of this material without explicit permission of the author or the publisher.
In case of other copyright issues, contact the author.