virtual void LeftDown(Point p, dword)
	{
		start = (Pointf)p / scale;
		SetCapture();
	}

	virtual void MouseMove(Point p, dword keyflags)
	{
		if(HasCapture()) {
			Pointf pos = (Pointf)p / scale;
			translate += (pos - start);
			start = pos;
			Refresh();
		}
	}