Flash制作红外线引导导弹爆炸视觉效果

Flash制作红外线引导导弹爆炸视觉效果(2) _global.gLEFT = 20;
_global.gTOP = 20;
_global.gRIGHT = Stage.width - 20;
_global.gBOTTOM = Stage.height - 20;

/* FUNCTION: Converts radians to degrees */
function rad2deg(radians:Number):Number {
  return radians * 180 / Math.PI;
} 
 
/* FUNCTION: Converts degrees to radians */
function deg2rad(degrees:Number):Number {
  return degrees * Math.PI / 180;
}

/* FUNCTION: Returns a random number between min and max (inclusive) */
function randRange(min:Number, max:Number):Number {
  var randomNum:Number = Math.floor(Math.random() * (max - min + 1)) + min;
  return randomNum;
}

/* FUNCTION: Creates an eXPlosion */
explosion.maxSpeed = 25;
explosion.minSize = 4;
explosion.maxSize = 10;
explosion.minFragments = 10;
explosion.maxFragments = 50;
function explosion(originX:Number, originY:Number):Void {
  var totalFragments:Number = randRange(explosion.minFragments, explosion.maxFragments);
  var fragment_mc:MovieClip;
  var depth:Number = this.getNextHighestDepth();
  for (var i:Number = 0; i < totalFragments; i++, depth++) {
    fragment_mc = attachMovie("Fragment", "fragment" + depth, depth);
    fragment_mc._x = originX;
    fragment_mc._y = originY;
    fragment_mc._width = fragment_mc._height = randRange(explosion.minSize, explosion.maxSize);
    while (!fragment_mc.speedX) {
      fragment_mc.speedX = randRange(-explosion.maxSpeed, explosion.maxSpeed);
    }
    while (!fragment_mc.speedY) {
      fragment_mc.speedY = randRange(-explosion.maxSpeed, explosion.maxSpeed);
    }
    fragment_mc._alpha = randRange(10, 100);