forked from: flash on 2010-3-16

绘制一棵树
夏天的树人

by JohnBrookes 16 Mar 2010

• Forked from summerTree's flash on 2010-3-16
• Diff: 31
• Related works: 3
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/**
 * Copyright JohnBrookes ( http://wonderfl.net/user/JohnBrookes )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/zfr0
 */

// forked from summerTree's flash on 2010-3-16
package 
{
	//绘制一棵树
	//夏天的树人
	import flash.display.Sprite;
	import flash.display.Graphics;
	import flash.events.*;
	
	import org.papervision3d.materials.special.VectorShapeMaterial;
	import org.papervision3d.objects.special.Graphics3D;
	import org.papervision3d.objects.special.VectorShape3D;
	import org.papervision3d.view.BasicView;
	
   [SWF(backgroundColor="0xffffff", frameRate="30")];
	public class Main extends BasicView
	{
		//private var shape:Sprite=new Sprite();
		private var shape : VectorShape3D;

		public function Main()
		{
			var material : VectorShapeMaterial = new VectorShapeMaterial();
			shape = new VectorShape3D(material);
			scene.addChild(shape);
			//addChild(shape);
			
			camera.z = -500;
			
			CreatTree(shape.graphics,0, 60, 90, 180,6);
			CreatTree(shape.graphics,0, 0, 45, 130,6);
			CreatTree(shape.graphics,0, 0, 135, 130,6);
			addEventListener(Event.ENTER_FRAME, tick);
		}
		
		private function tick(e:Event):void 
		{
			camera.orbit(viewport.mouseY - viewport.viewportHeight * 0.5 +90, viewport.mouseX - viewport.viewportWidth * 0.5 - 90);
			singleRender();
		}
		//绘图对象，基本坐标px,py,角度，偏移长度，数量
		private function CreatTree(g:Graphics3D,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:Graphics3D,n:int,x1:Number,y1:Number,x2:Number,y2:Number):void
		{
			g.lineStyle(n,0x000000);
			g.moveTo(x1,-y1);
			g.lineTo(x2,-y2);
		}
	}
}