flash on 2012-3-8

by bradsedito 08 Mar 2012

Embed

/**
 * Copyright bradsedito ( http://wonderfl.net/user/bradsedito )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/ekio
 */






package
{
    import flash.display.*;
    import flash.events.*;
    
    public class LocatePoint extends Sprite
    {
        public function LocatePoint()
        {
    
    function pointInPolygon(x:Number, y:Number, polyX:Array, polyY:Array):Boolean
    {
    var j:int = polyX.length - 1;
    var oddNodes:Boolean = false;
    for (var i:int=0; i <polyX.length; i++) {
    if (polyY[i] <y && polyY[j]>= y ||  polyY[j] <y && polyY[i]>= y) {
 
      if (polyX[i] + (y - polyY[i]) / (polyY[j] - polyY[i]) * (polyX[j] - polyX[i]) <x) {
        oddNodes = !oddNodes;
      }
    }
    j = i;
  }
  return  oddNodes;
}
 
// draw an overly complex poly and store all  x y coords
var pX:Array= new Array();
var pY:Array = new Array();
graphics.beginFill(0xCC0000);
for (var i:int = 0; i<60; i++){
    pX[i] = Math.random()*stage.stageWidth;
    pY[i] =Math.random()*stage.stageHeight;
    if (i == 0){
        graphics.moveTo(pX[i], pY[i]);
    }else{
        graphics.lineTo(pX[i], pY[i]);
    } 
}
addEventListener(Event.ENTER_FRAME, onLoop);
function onLoop(evt:Event):void {
       alpha = 1;
       if (pointInPolygon(mouseX, mouseY, pX, pY)){
            alpha = .5;
       }
}



        }
    }
}