/**
*
* @author
*
*/
class BG extends egret.Sprite{
public constructor() {
super();
this.once(egret.Event.ADDED_TO_STAGE,this.onAddToStage,this);
}
private onAddToStage(){
var bg:egret.Shape=new egret.Shape();
bg.graphics.beginFill(0x000000);
bg.graphics.drawRect(0,0,this.stage.stageWidth,this.stage.stageHeight);
bg.graphics.endFill();
this.addChild(bg);
for(var i:number=0;i<50;i++){
this.cc();
}
for(var j:number=0;j<7;j++){
this.kxcc();
}
var arrControlP1=[
[],
[]
];
var lineSp:egret.Sprite=new egret.Sprite();
this.addChild(lineSp);
for(var m:number=0;m<10;m++){
var moveP = new Point2D(100,this.stage.stageHeight/2 + Math.random() * 100 - 50);
var fh = Math.random() < 0.5?-1:1;
var minOffsetY=30;
var rdOffsetY = 100;
var rd = Math.random() * rdOffsetY;
var jl = fh * (minOffsetY + rd);
var controlP1 = new Point2D(170 + Math.random() *100,0);
controlP1.y = moveP.y + jl;
var bfb = fh * (rd / rdOffsetY);
console.log('moveP.y:%d, rd:%d, controlP1.y:%d, 百分比:',moveP.y,rd,controlP1.y,bfb);
var controlP2 = new Point2D(100 + Math.random() * 100,0);
controlP2.y = moveP.y+bfb*250;
console.log(controlP2.y);
var endP = new Point2D(0,0);
endP.y = moveP.y + bfb * 350;
endP.x=250+Math.random()*50;
var cp = [moveP,controlP1,controlP2,endP];
var line:egret.Shape=new egret.Shape();
line.graphics.lineStyle(2,0xc6017d+(0xffc600 - 0xc6017d)* Math.random());
line.graphics.moveTo(cp[0].x,cp[0].y);
line.graphics.endFill();
lineSp.addChild(line);
this.arrLine.push(line);
line['points']=this.ComputeBezier(cp,100,[]);
//console.log(line['points']);
}
//console.log(this.arrLine.length);
/*lineSp.anchorOffsetX = lineSp.x =this.stage.stageWidth/2;
lineSp.anchorOffsetY = lineSp.y =this.stage.stageHeight/2;
lineSp.rotation=90;*/
this.addEventListener(egret.Event.ENTER_FRAME,this.onEnterframe,this);
}
private arrLine=[];
private iIndex=0;
private onEnterframe(event:egret.Event){
for(var m: number = 0; m < this.arrLine.length; m++) {
var line= this.arrLine[m];
if(line['points'][this.iIndex])
line.graphics.lineTo(line['points'][this.iIndex].x,line['points'][this.iIndex].y);
}
this.iIndex++;
}
private cc(circle?:egret.Shape){
if(!circle){
circle= new egret.Shape();
circle.graphics.beginFill(0xffffff * Math.random());
circle.graphics.drawCircle(0,0,1+Math.random()*20);
circle.graphics.endFill();
this.addChild(circle);
}
circle.alpha = 0;
circle.scaleX = circle.scaleY = 0;
circle.x = this.stage.stageWidth * Math.random();
circle.y = this.stage.stageHeight * Math.random();
var delay=Math.random()*2000;
var duration = 2000 + Math.random() * 2000;
var alpha=0.1+Math.random()*0.9;
egret.Tween.get(circle)
.wait(delay).to({scaleX:1,scaleY:1,alpha:alpha},duration)
.wait(delay).to({ scaleX: 0,scaleY: 0,alpha: 0 },duration).call(function(){
this.cc(circle);
},this);
}
private kxcc(circle?:egret.Shape) {
if(!circle) {
circle = new egret.Shape();
circle.graphics.lineStyle(1,0xffffff);
//circle.graphics.beginFill(0xffffff * Math.random());
circle.graphics.drawCircle(0,0,150 + Math.random() * 150);
circle.graphics.endFill();
this.addChild(circle);
}
circle.alpha = 0;
circle.scaleX = circle.scaleY = 0.5;
circle.x = this.stage.stageWidth * Math.random();
circle.y = this.stage.stageHeight * Math.random();
var delay = Math.random() * 4000;
var duration = 2000 + Math.random() * 2000;
var alpha = 0.1 + Math.random() * 0.9;
egret.Tween.get(circle).wait(delay)
.to({ scaleX: 1,scaleY: 1,alpha: alpha },duration)
.to({ scaleX: 1.5,scaleY: 1.5,alpha: 0 },duration).call(function() {
this.kxcc(circle);
},this);
}
/*
cp在此是四個元素的陣列:
cp[0]為起始點，或上圖中的P0
cp[1]為第一個控制點，或上圖中的P1
cp[2]為第二個控制點，或上圖中的P2
cp[3]為結束點，或上圖中的P3
t為參數值，0 <= t <= 1
*/
private PointOnCubicBezier(cp,t) {
var ax,bx,cx;
var ay,by,cy;
var tSquared,tCubed;
var result = new Point2D();
/*計算多項式係數*/
cx = 3.0 * (cp[1].x - cp[0].x);
bx = 3.0 * (cp[2].x - cp[1].x) - cx;
ax = cp[3].x - cp[0].x - cx - bx;
cy = 3.0 * (cp[1].y - cp[0].y);
by = 3.0 * (cp[2].y - cp[1].y) - cy;
ay = cp[3].y - cp[0].y - cy - by;
/*計算位於參數值t的曲線點*/
tSquared = t * t;
tCubed = tSquared * t;
result.x = (ax * tCubed) + (bx * tSquared) + (cx * t) + cp[0].x;
result.y = (ay * tCubed) + (by * tSquared) + (cy * t) + cp[0].y;
return result;
}
/*
ComputeBezier以控制點cp所產生的曲線點，填入Point2D結構的陣列。
呼叫者必須分配足夠的記憶體以供輸出結果，其為<sizeof(Point2D) numberOfPoints>
*/
private ComputeBezier(cp,numberOfPoints,curve) {
var dt;
var i;
dt = 1.0 / (numberOfPoints - 1);
for(i = 0;i < numberOfPoints;i++)
curve[i] = this.PointOnCubicBezier(cp,i * dt);
return curve;
}
}