/*
矢量线条的擦除在涂鸦板也许用处不是很大
写的不到位,还望高手指点
原理很简单,
用橡皮来检测与数组中的点相碰
删除碰撞点
重新绘制线条
放在第一帧就可以运行
Email:happyclub@163.com

*/

var startX:Number;
//起始点
var startY:Number;
var Path:Object = this;
//路径
var lineArray:Array = [];
//鼠标点数组
var clearLine:Boolean = false;
//是否清除线条
var RdrawTo:Boolean = false;
//是否从新绘制
var StartDraw:Boolean = false;
//开始绘制
Path.createEmptyMovieClip("drawMc", 1);
//建绘图MC
Path.createEmptyMovieClip("mask", 2);
//建橡皮遮罩线条MC
var lineOrder:Number = 0;
//数组下标
//-----------------------INIT-------------------------------------
var eraser:MovieClip = createRectangle(15, 15);
eraser._x = Stage.width/2;
eraser._y = Stage.height/2;
eraser.onPress = function() {
 clearLine = true;
 this.startDrag();
};
eraser.onRelease = function() {
 clearLine = false;
 stopDrag();
};
function createRectangle(W, H):MovieClip {
 var depth:Number = Path.getNextHighestDepth();
 var mc:MovieClip = Path.createEmptyMovieClip("eraser", depth);
 mc.beginFill(0x0033ff);
 mc.lineTo(0, H);
 mc.lineTo(W, H);
 mc.lineTo(W, 0);
 mc.lineTo(0, 0);
 return mc;
}
//--------------------------eraser------------------------------------
Path.onMouseDown = function() {
 var i = 0;
 while (lineArray[i] == "#") {
  i++;
 }
 lineArray.splice(0, i);
 lineOrder = lineArray.length;
 StartDraw = true;
 startX = _xmouse;
 startY = _ymouse;
 Insertion = true;
};
Path.onMouseMove = function() {
 if (StartDraw == true && clearLine == false) {
  lineArray[lineOrder] = [];
  lineArray[lineOrder].push(_xmouse, _ymouse);
  Path.drawMc.lineStyle(5, 0, 100);
  Path.drawMc.moveTo(startX, startY);
  Path.drawMc.lineTo(_xmouse, _ymouse);
  lineOrder++;
 }
 startX = _xmouse;
 startY = _ymouse;
 if (clearLine == true) {
  for (var i = 0; i<lineArray.length; i++) {
   if (Path.eraser.hitTest(lineArray[i][0], lineArray[i][1], true)) {
    Path.mask.lineStyle(5, 0xffffff, 100);
    Path.mask.moveTo(lineArray[i][0], lineArray[i][1]);
    Path.mask.lineTo(lineArray[i][0]+1, lineArray[i][1]+1);
    Path.mask.lineTo(lineArray[i][0]-1, lineArray[i][1]-1);
    Insertion == true && lineArray[i-1] != "#" && lineArray[i] != "#" && lineArray[i+1] != "#" ? (lineArray.splice(i, 1, "#")) : lineArray.splice(i, 1);
    RdrawTo = true;
    Insertion = false;
    break;
   }
  }
 }
};
//-----------------------MOUSEMOVE-------------------------------------------------------------
Path.onMouseUp = function() {
 StartDraw = false;
 if (RdrawTo == true) {
  Rdraw();
 }
 lineArray[lineArray.length-1] != "#" ? (lineArray.push("#"), lineOrder++) : null;
 RdrawTo = false;
};
//-----------------------MOUSEUP-------------------------------------------------------------
function Rdraw() {
 Path.mask.clear();
 Path.drawMc.clear();
 Path.drawMc.lineStyle(5, 0, 100);
 for (var i = 0; i<lineArray.length; i++) {
  if (lineArray[i] != undefined && lineArray[i+1] != undefined && lineArray[i+1] != "#" && lineArray[i] != "#") {
   Path.drawMc.moveTo(lineArray[i][0], lineArray[i][1]);
   Path.drawMc.lineTo(lineArray[i+1][0], lineArray[i+1][1]);
  }
 }
}
//-------------------------重绘-----------------------------------------------------------