curveTo加强版的曲线效果

做了一个曲线效果

点击浏览该文件

下面是代码，第一个函数是curveTo的加强版，大家也来试试吧！

//points是控制点的数组，t是精度吗？n是阶（其实就是控制点的个数）
functionbezier(points,t,n){
vararr=newArray();
for(vari=0;ivartemp=newObject();
temp.x=points[i].x;
temp.y=points[i].y;
arr.push(temp);
}
for(varr=1;rfor(vari=0;iarr[i].x=(1-t)*arr[i].x+t*arr[i+1].x;
arr[i].y=(1-t)*arr[i].y+t*arr[i+1].y;
}
}
return(arr[0]);
}
///////////////////////////////////////////////////////////////////////
varpoints_arr:Array=newArray();
init();

functiondoMouseDown(){
_root.clear();
_root.lineStyle(1,0x0000ff,15);
for(vari=0;iif(i==0)
_root.moveTo(points_arr[i].x,points_arr[i].y);
_root.lineTo(points_arr[i].x,points_arr[i].y);
}
_root.lineStyle(1,0xff0000,100);
n=points_arr.length;
k=5*n;
for(vari=0;i<=k;i++){
vart=i/k;
varpoint=bezier(points_arr,t,n);
if(i==0)
_root.moveTo(point.x,point.y);
_root.lineTo(point.x,point.y);
}
if(points_arr.length>20)
points_arr=newArray();
}
///////////////////////////////////////////////////////////////////////

functioninit(){
l=newObject();
l.onMouseDown=function(){
varpoint=newObject();
point.x=_xmouse;
point.y=_ymouse;
points_arr.push(point);
if(onEnterFrame!=undefined){
deleteonEnterFrame;
points_arr=newArray();
}
};
l.onMouseUp=doMouseDown;
Mouse.addListener(l);
_root.onEnterFrame=function(){
_root.clear();
_root.lineStyle(1,0xff0000,100);
varpoint=newObject();
point.x=500*Math.random();
point.y=500*Math.random();
points_arr.push(point);
_root.lineStyle(1,0xff0000,100);
doMouseDown();
};
}