flash on 2010-3-16

绘制一棵树
夏天的树人

forked:3
favorite:7
lines:43
license : MIT License
modified : 2010-03-16 10:35:32

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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);
		}
	}
}

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