» 算法

这是一个AS写的动态树效果,如果你看不到这个flash,请到文章页面查看! 今天在群里有朋友发来个算法,用代码画树,可牛了,修改了贴过来,O(∩_∩)O~ ;-) package { import flash.display.Sprite; import flash.events.Event; import flash.events.MouseEvent; import flash.text.TextField; /** * www.litefeel.com * lite3@qq.com * @author lite3 */ public class ASTree extends Sprite { private var arr:Array ; private var canvas:Sprite; private var pauseFrames:int 0; private var showTree:Function; public function ASTree() { canvas this; drawTree(); this.addEventListener(Event.ENTER_FRAME, enterFrameHandler); stage.addEventListener(MouseEvent.CLICK, clickHandler); var txt:TextField new TextField(); txt.text "点击切换效果!"; addChild(txt); } private function clickHandler(e:MouseEvent):void { drawTree(); } /** * 划线 * @param beginX * @param beginY * @param endX * @param endY */ private function drawLine(beginX:Number, beginY:Number, endX:Number, endY:Number):void { canvas.graphics.moveTo(beginX, beginY); canvas.graphics.lineTo(endX, endY); } /** * 递归画树 * @param x Number 基点x * @param y Number 基点y * @param l Number 长度 * @param angle Number 角度 * @param n int 一个枝的节数 */ private function lzh(x:Number, y:Number, l:Number, angle:Number, n:int):void { if (n < 0) return; var a_l:Number, a_r:Number, x1:Number, y1:Number, x2:Number, y2:Number; x1 x + 0.5 * l * Math.cos(angle * Math.PI / 180); y1 y - 0.5 * l * Math.sin(angle * Math.PI / 180); x2 x + l * Math.cos(angle * Math.PI / 180); y2 y - l * Math.sin(angle * Math.PI / 180); arr.push(); a_l angle + 30; a_r angle-30; l l * 2 / 3; lzh(x2, y2, l, angle-Math.random() * 10, n - 1); lzh(x1, y1, l * 2 / 3, a_l, n - 1); lzh(x1, y1, l * 2 / 3, a_r, n - 1); lzh(x2, y2, l * 2 / 3, a_l, n - 1); lzh(x2, y2, l * 2 / 3, a_r, n - 1); } private function enterFrameHandler(e:Event):void { if (arr.length >0) { showTree(); }else if (++pauseFrames > 60) { pauseFrames 0; drawTree(); } } // 重新画树 private function drawTree():void { canvas.graphics.clear(); canvas.graphics.lineStyle(1, Math.random() * 0xFFFFFF, 1); arr ; pauseFrames 0; lzh(250, 350, 120, 90, 6); showTree as Function; } // 画树的效果1 private function showTree1():void { for (var i:int 0; i < 5; i++) { var arg:Array arr.pop() if (arg) drawLine(arg, arg, arg, arg); } } // 画树的效果2 private function showTree2():void { for (var i:int 0; i < 5; i++) { var arg:Array arr.shift() if (arg) drawLine(arg, arg, arg, arg); } } // 画树的效果3 private function showTree3():void { for (var i:int 0; i < 5; i++) { var index:int Math.random() * arr.length / 10; var arg:Array arr.splice(index, 1) as Array; if (arg) drawLine(arg, arg, arg, arg); } } // 画树的效果4 private function showTree4():void { for (var i:int 0; i < 5; i++) { var index:int Math.random() * arr.length / 2; var arg:Array arr.splice(index, 1) as Array; if (arg) drawLine(arg, arg, arg, arg); } } } }

LiteFeel

AS树

太公分猪肉