用Graphics的 drawPath 来画曲线（2）--可拖动 控制 变形的贝塞尔曲线

可以拖动 控制的 曲线：

代码如下：

package{import flash.display.GraphicsPathCommand;import flash.display.Sprite;import flash.events.MouseEvent;public class drawCurveLine0 extends Sprite{public function drawCurveLine0(){super();lineContainer=new Sprite();addChild(lineContainer);anchorContainer=new Sprite();addChild(anchorContainer);anchorVector.push(200, 200); //起点anchorVector.push(250, 100); //控制点1anchorVector.push(300, 200); //节点2anchorVector.push(400, 250); //控制点2anchorVector.push(300, 300);anchorVector.push(250, 400);anchorVector.push(200, 300);anchorVector.push(100, 250);anchorVector.push(200, 200);commandVector.push(GraphicsPathCommand.MOVE_TO);commandVector.push(GraphicsPathCommand.CURVE_TO); //样式:曲线commandVector.push(GraphicsPathCommand.CURVE_TO);commandVector.push(GraphicsPathCommand.CURVE_TO);commandVector.push(GraphicsPathCommand.CURVE_TO);//创建控制点按钮 anchorVector的长度是18，共有9个点 //例如 第3个点的 x坐标：anchorVector[3*2], y坐标:anchorVector[3*2+1]var numOfAnchor:uint=anchorVector.length / 2;for (var i:uint=0; i < numOfAnchor; i++){var color:uint=(i % 2) ? 0x0000FF : 0xFF0000;//索引为奇数的是控制点 画成蓝色var anchor:Anchor=new Anchor(i, color);anchor.x=anchorVector[i * 2];anchor.y=anchorVector[i * 2 + 1];anchor.addEventListener(MouseEvent.MOUSE_DOWN, anchor_MouseDownHandler);anchor.addEventListener(MouseEvent.MOUSE_UP, anchor_MouseUpHandler);anchorContainer.addChild(anchor);}//画线 lineDraw();}private var anchorContainer:Sprite; //控制点容器private var anchorVector:Vector.<Number>=new Vector.<Number>(); //节点数组private var commandVector:Vector.<int>=new Vector.<int>(); //线型数组private var currentAnchor:Anchor; //当前选中控制点private var lineContainer:Sprite; //曲线画布/** *根据节点和线型 重绘  * */       public function lineDraw():void{lineContainer.graphics.clear();lineContainer.graphics.lineStyle(0, 0x000000);lineContainer.graphics.drawPath(commandVector, anchorVector); //画路径lineContainer.graphics.endFill();}/** *鼠标选中控制点，启动控制点的拖动，触发move事件从而重画曲线*/private function anchor_MouseDownHandler(event:MouseEvent):void{currentAnchor=Anchor(event.target);currentAnchor.startDrag();stage.addEventListener(MouseEvent.MOUSE_MOVE, mouseMoveHandler);}private function anchor_MouseUpHandler(event:MouseEvent):void{currentAnchor.stopDrag();stage.removeEventListener(MouseEvent.MOUSE_MOVE, mouseMoveHandler);}/** 鼠标拖动控制点时重画  */private function mouseMoveHandler(e:MouseEvent):void{var idx:uint=currentAnchor.idx;anchorVector[idx * 2]=currentAnchor.x;anchorVector[idx * 2 + 1]=currentAnchor.y;lineDraw(); }}} import flash.display.Sprite;class Anchor extends Sprite {public function Anchor(idx:uint, color:uint=0xFF0000){_idx=idx;graphics.beginFill(color, 0.5);graphics.drawCircle(0, 0, 10);graphics.endFill();buttonMode=true;}private var _idx:uint;public function get idx():uint{return _idx;}}