flash sin

//参数常量
const Y_SPEED = 0.07; //y轴变化速度
const X_SPEED = 0.10; //x轴变化速度
const AMPLITUDE = 150.0; //最大振幅
const X_START = stage.stageWidth/2; //x轴的起始点
const Y_START = stage.stageHeight/2; //y轴的起始点

//变量
var ySpeed:Number = Y_SPEED;
var xSpeed:Number = X_SPEED;
var amplitude:Number = AMPLITUDE;
var angleX = 0;
var angleY = 0;

var b:Ball = new Ball();
addChild(b);

b.x = X_START;
b.y = Y_START;

graphics.moveTo(b.x,b.y);

addEventListener(Event.ENTER_FRAME,EnterFrameHandler);

function EnterFrameHandler(e:Event){

b.y = Y_START + Math.sin(angleY) * amplitude;
b.x = X_START + Math.sin(angleX) * amplitude;

angleX += xSpeed;
angleY += ySpeed;

//angleX += Math.random()/10;
//angleY += Math.random()/5;

graphics.lineStyle(1,0xefefef,1);
graphics.lineTo(b.x,b.y);
}