code: public void set(float sx, float sy, float ex, float ey) {
  		super.pointsDirty = true;
  		start.set(sx, sy);
  		end.set(ex, ey);
  		float dx = (ex - sx);
  		float dy = (ey - sy);
  		vec.set(dx,dy);
  		
  		lenSquared = (dx * dx) + (dy * dy);
  	}
docs: Configure the line without garbage
  
  @param sx
  The x coordinate of the start
  @param sy
  The y coordinate of the start
  @param ex
  The x coordiante of the end
  @param ey
  The y coordinate of the end