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Flex顶用AS3实现贝塞尔曲线图

发布时间:2011-06-27 19:46:42 文章来源:www.iduyao.cn 采编人员:星星草
Flex中用AS3实现贝塞尔曲线图

       周末在家研究了下用Flex实现神奇的贝塞尔曲线,这曲线主要采用的是FLex线程技术来实现,实现后,我一看运行效果,呵呵太神了…效果截图如下:

图片1

图2

代码如下:

CurveDemo.as

package org.luosijin.curve   
{   
 import flash.display.Sprite;   
 import flash.events.Event;   
 import flash.events.KeyboardEvent;   
 import flash.events.TimerEvent;   
 import flash.filters.GlowFilter;   
 import flash.geom.Point;   
 import flash.utils.Timer;   
    
 [SWF(width="730", height="300", backgroundColor="0x000000", frameRate="24")]    
 public class CurveDemo extends Sprite   
 {   
  private var _radius:int = 100;       //定义半径    
  private var _numPoints:Number = 30; //定义点数量    
  private var _points:Array = new Array();    
  private var _pre_r:Number = Math.PI * 0.0001;    
  private var _centX:Number = stage.stageWidth * 0.5;    
  private var _centY:Number = stage.stageHeight * 0.5;    
  private var _myTimer:Timer = new Timer(10, 0);    
  private var _color:Number = 0xACD8A4; //初始化颜色    
  private var _radians:Number = 0; //初始弧度值    
  private var _gf:GlowFilter = new GlowFilter();    
  
  public function CurveDemo()   
  {   
   _myTimer.addEventListener(TimerEvent.TIMER,onTimerHandler);   
   _myTimer.start();   
   //定义滤镜参数    
   _gf.blurX = _gf.blurY = 32;   
   _gf.color = 0xCBDAFF;   
   this.filters = [_gf];   
      
   stage.addEventListener(KeyboardEvent.KEY_DOWN,onKeyDown);   
  }   
  private function onTimerHandler(evt:Event):void  
  {   
   run();   
  }   
  private function run():void  
  {   
   graphics.clear();   
   _points = [];   
   _radians += _pre_r;   
      
   for(var i:int=1;i<_numPoints;i+=1)   
   {   
    var p:Point = new Point();   
    //重点部分正余弦作用    
    p.x = _centX + Math.cos(_radians*i)*i*5;   
    p.y = _centY + Math.sin(_radians*i)*i*5;   
    _points.push(p);   
   }   
   graphics.beginFill(_color,0.2);   
   graphics.lineStyle(1,_color,0.8);   
   graphics.moveTo(_centX,_centY);   
   for(i=2;i<_numPoints-2;i+=1)   
   {   
    graphics.curveTo(_points[i-1].x,_points[i-1].y,_points[i].x,_points[i].y);   
    graphics.curveTo(_points[i+1].x,_points[i+1].y,_centX,_centY);   
   }   
   graphics.endFill();   
  }   
  private function onKeyDown(evt:KeyboardEvent):void    
  {    
   switch (evt.keyCode)    
   {    
    case 97:    
     _color = 0x71CA65;    
     break;    
    case 98:    
     _color = -0xFF3300;    
     break;    
    case 99:    
     _color = 0xB5B0F3;    
     break;    
    case 100:    
     _color = 0xFA04C9;    
     break;    
    case 101:    
     _color = 0x62F6E5;    
     break;    
    case 102:    
     _color = 0xC07168;    
     break;    
    case 103:    
     _color = 0x75DE32;    
     break;    
    case 104:    
     _color = 0x32C1F0;    
     break;    
    case 105:    
     _color = 0x0285FF;    
     break;    
   }    
  }    
 }    
}  
CurveDemo.as2
package org.luosijin.curve   
{   
 import flash.display.*;   
 import flash.events.*;   
 import flash.filters.*;   
 import flash.geom.*;   
 import flash.utils.*;   
 [SWF(width="730", height="500", backgroundColor="0x000000", frameRate="24")]   
 public class CurveDemo2 extends Sprite   
 {   
  private var _radius:int = 100;   
  private var _numPoints:Number = 30;   
  private var _points:Array;   
  private var _pre_r:Number = 0.000314159;   
  private var _centX:Number;   
  private var _centY:Number;   
  private var _myTimer:Timer;   
  private var _color:Number = 165375;   
  private var _radians:Number = 0;   
  private var _gf:GlowFilter;   
     
  public function CurveDemo2()   
  {   
   _points = new Array();   
   _centX =900* 0.5;   
   _centY =600* 0.5;   
   _myTimer = new Timer(10, 0);   
   _gf = new GlowFilter();   
   _myTimer.addEventListener(TimerEvent.TIMER,onTimerHandler);   
   _myTimer.start();   
   var _loc_1:int;   
   _gf.blurY = 32;   
   _gf.blurX = _loc_1;   
   _gf.color = 165375;   
   filters = [_gf];   
      
  }// end function   
     
  private function onTimerHandler(param1:Event) : void  
  {   
   run();   
      
  }// end function   
     
  private function run() : void  
  {   
   var _loc_2:Point;   
   graphics.clear();   
   _points = [];   
   _radians = _radians + _pre_r;   
   var _loc_1:Number=0;   
   while (_loc_1 < _numPoints)   
   {   
    // label   
    _loc_2 = new Point();   
    _loc_2.x = _centX + Math.cos(_radians * _loc_1) * 140;   
    _loc_2.y = _centY + Math.sin(_radians * _loc_1) * 140;   
    _points.push(_loc_2);   
    _loc_1 = _loc_1 + 1;   
   }// end while   
   graphics.beginFill(_color, 0.2);   
   graphics.lineStyle(1, _color, 0.8);   
   graphics.moveTo(_centX, _centY);   
   _loc_1 = 2;   
   while(_loc_1 < _numPoints-2){   
    graphics.curveTo(_points[_loc_1-1].x, _points[_loc_1-1].y, _points[_loc_1].x, _points[_loc_1].y);   
    graphics.curveTo(_points[_loc_1 + 1].x, _points[_loc_1 + 1].y, _centX, _centY);   
    _loc_1 = _loc_1 + 1;   
   }   
   graphics.endFill();   
      
  }// end function   
     
 }   
  
}
 

 

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