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/**
 * @fileoverview  This file defines the HorizontalPad class.
 */

/**
 * A Horizontal Floater.
 */
function HorizontalPad(initObj) {
  this.absorbNamedValues(initObj);
  this.maxSpeed = 4 * 20;
  this.moveAmount = 4 * 20;
  this.width = 42;
  this.height = 1;
}
HorizontalPad.prototype = new Actor;

HorizontalPad.prototype.onTick = function(timeElapsed) {
  // When you attach me to a platform, I make it so nobody
  // can stand on it... only me.
  world.platforms[this.platformID].isNotSolid = true;

  // I move based off of the platform that I'm on. So get that now.
  var myPlatform = world.platforms[this.platformID];

  // I bounce back and forth between the left and right points on my platform.
  if (this.mapX < myPlatform.left.mapX) {
    this.moveAmount += 1;
  } else if (this.mapX > myPlatform.right.mapX) {
    this.moveAmount -= 1;
  } else if (this.moveAmount >= 0) {
    this.moveAmount = this.maxSpeed;
  } else {
    this.moveAmount = -this.maxSpeed;
  }

  // I match my rotation to that of my platform.
  this.rotZ = myPlatform.rotZ;

  // Here's how I move. moveMapX is a handy function that updates both
  // my "virtual 2d world" mapX, as well as my literal x + y values
  this.moveMapX(this.moveAmount * timeElapsed)

  // If I collide with the avatar, then move the avatar along with me,
  // and set his "override" groundZ to be my own Z.
  if (this.collidesWith(avatar)) {
    if (avatar.velZ <= 0 && avatar.z >= this.z - 25) {
      avatar.moveMapX(this.moveAmount * timeElapsed);
      avatar.groundZ = this.z;
    }
  }

  updateActor(this);
}