重力感应示例

package
{

import flash.display.Sprite;
import flash.display.StageAlign;
import flash.display.StageScaleMode;
import flash.events.Event;
import flash.events.AccelerometerEvent;
import flash.sensors.Accelerometer;

public class AccelerometerTest extends Sprite
{
private var ball:Sprite;
private var accelerometer:Accelerometer;
private var xSpeed:Number = 0;
private var ySpeed:Number = 0;
private const RADIUS = 20;

public final function AccelerometerTest()
{
stage.scaleMode = StageScaleMode.NO_SCALE;
stage.align = StageAlign.TOP_LEFT;

createBall();

if (Accelerometer.isSupported)
{
accelerometer = new Accelerometer();
accelerometer.addEventListener(AccelerometerEvent.UPDATE, accUpdateHandler);
stage.addEventListener(Event.ENTER_FRAME, enterFrameHandler);
}
}

private final function createBall():void
{
ball = new Sprite();
ball.graphics.beginFill(0xFF0000);
ball.graphics.drawCircle(0, 0, RADIUS);
ball.cacheAsBitmap = true;
ball.x = stage.stageWidth / 2;
ball.y = stage.stageHeight / 2;
addChild(ball);
}

private final function enterFrameHandler(event:Event):void
{
event.stopPropagation();
moveBall();
}
private final function moveBall():void
{
var newX:Number = ball.x + xSpeed;
var newY:Number = ball.y + ySpeed;
if (newX < 20)
{
ball.x = RADIUS;
xSpeed = 0;
}
else if (newX > stage.stageWidth - RADIUS)
{
ball.x = stage.stageWidth - RADIUS;
xSpeed = 0;
}
else
{
ball.x += xSpeed;
}

if (newY < RADIUS)
{
ball.y = RADIUS;
ySpeed = 0;
}
else if (newY > stage.stageHeight - RADIUS)
{
ball.y = stage.stageHeight - RADIUS;
ySpeed = 0;
}
else
{
ball.y += ySpeed;
}
}

private final function accUpdateHandler(event:AccelerometerEvent):void
{
xSpeed -= event.accelerationX * 2;
ySpeed += event.accelerationY * 2;
}
}
}