Forked from:: summerTree's flash on 2010-3-16

Tree in the breeze

绘制一棵树
@author 夏天的树人

forked:2
favorite:25
lines:58
license : MIT License
modified : 2010-04-20 23:53:32

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// forked from summerTree's flash on 2010-3-16
package 
{
	import flash.display.*;
	import flash.events.*;
	import flash.geom.Point;
	import flash.filters.GlowFilter;
	
	[SWF(backgroundColor="0xffffff", frameRate="25")]
	
	//绘制一棵树
	//@author 夏天的树人	
	public class Main extends Sprite
	{
		private var shape:Shape;
		private var source:BitmapData;
		
		public function Main()
		{
			shape = new Shape();
			//addChild(shape);
			source = new BitmapData(465, 465, false, 0xffffff);
			addChild(new Bitmap(source));
			this.addEventListener(Event.ENTER_FRAME, onEnterFrame);
		}
		
		private function onEnterFrame(e:Event):void
		{
			shape.graphics.clear();
			creatTree(shape.graphics, 232, 465, 90, 180, 5);
			creatTree(shape.graphics, 232, 465, 45, 100, 4);
			creatTree(shape.graphics, 232, 465, 135, 100, 4);
			step += (Math.PI/80) % Math.PI;
			
			source.fillRect(source.rect, 0xffffff);
			source.draw(shape);
		}
		
		private var step:Number = 0.0;
		private static const toRadian:Number = Math.PI / 180;
		
		//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)
			{
				angle += 3 * Math.cos(step) - 2;
				
				var x1:Number = px+0.1*len*Math.cos(angle * toRadian);
				var y1:Number = py-0.1*len*Math.sin(angle * toRadian);

var x2:Number = px+len*Math.cos(angle * toRadian);
				var y2:Number = py-len*Math.sin(angle * toRadian);

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 - 3 * Math.sin(step), 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,0x006600);
			g.moveTo(x1,y1);
			g.lineTo(x2,y2);
		}
	}
}

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