package { //绘制一棵树 //夏天的树人 import flash.display.Sprite; import flash.display.Graphics; import flash.events.*; [SWF(backgroundColor="0xffffff", frameRate="30")]; public class Main extends Sprite { private var shape:Sprite=new Sprite(); public function Main() { addChild(shape); CreatTree(shape.graphics,300, 460, 90, 180,6); CreatTree(shape.graphics,300, 400, 45, 130,6); CreatTree(shape.graphics,300, 400, 135, 130,6); } //绘图对象，基本坐标px,py,角度，偏移长度，数量 private function CreatTree(g:Graphics,px:Number,py:Number,angle:Number,len:Number,n:int):void { if (n>0) { var x1:Number=px+0.1*len*Math.cos(angle*Math.PI/180); var y1:Number=py-0.1*len*Math.sin(angle*Math.PI/180); var x2:Number=px+len*Math.cos(angle*Math.PI/180); var y2:Number=py-len*Math.sin(angle*Math.PI/180); drawLine(g,n-1,px,py,x2,y2); var a_l:Number = angle+30; var a_r:Number = angle-30; len = len*2/3; CreatTree(g,x2, y2, angle-Math.random()*10,len, n-1); CreatTree(g,x1, y1, a_l,len*2/3, n-1); CreatTree(g,x1, y1, a_r, len*2/3,n-1); CreatTree(g,x2, y2, a_l,len*2/3, n-1); CreatTree(g,x2, y2, a_r,len*2/3, n-1); } } //绘制线 private function drawLine(g:Graphics,n:int,x1:Number,y1:Number,x2:Number,y2:Number):void { g.lineStyle(n,0x000000); g.moveTo(x1,y1); g.lineTo(x2,y2); } } }