AS3 Flex的一个贝塞尔(Bezier)曲线图形实例
代码如下:
CurveDemo.as
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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; } } } } ?
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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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