code: public float getMovementCost(Mover mover, int sx, int sy, int tx, int ty) {
  		this.mover = mover;
  		this.sourceX = sx;
  		this.sourceY = sy;
  		
  		return map.getCost(this, tx, ty);
  	}
docs: Get the cost to move through a given location
  
  @param mover The entity that is being moved
  @param sx The x coordinate of the tile whose cost is being determined
  @param sy The y coordiante of the tile whose cost is being determined
  @param tx The x coordinate of the target location
  @param ty The y coordinate of the target location
  @return The cost of movement through the given tile