/*
   Copyright (C) 1999/2000/2001   The Adonthell Project
   Part of the Adonthell Project <http://adonthell.nongnu.org>

   Adonthell is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   Adonthell is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with Adonthell.  If not, see <http://www.gnu.org/licenses/>.
*/

/**
 * @file   drawing_area.cc
 * @author Alexandre Courbot <alexandrecourbot@linuxgames.com>
 * 
 * @brief  Defines the drawing_area class.
 * 
 * 
 */

#include "drawing_area.h"


drawing_area::drawing_area ()
{
    move (0, 0);
    resize (0, 0);
    draw_to = NULL; 
}

drawing_area::drawing_area (s_int16 px, s_int16 py, u_int16 pw, u_int16 ph)
{
    move (px, py);
    resize (pw, ph); 
    draw_to = NULL; 
}

drawing_area& drawing_area::operator = (SDL_Rect& r) 
{
    rect = r;
    draw_to = NULL;
    return (*this); 
}

SDL_Rect drawing_area::setup_rects () const
{
    if (draw_to)
    {
        SDL_Rect ret;
        SDL_Rect temp = draw_to->setup_rects ();

        ret.x = temp.x > x ()? temp.x : x ();
        ret.y = temp.y > y ()? temp.y : y ();

        // Precalculated for faster operation.
        s_int32 xpl = x () + length ();
        s_int32 txw = temp.x + temp.w;
        s_int32 txwmrx = txw - ret.x;
        s_int32 xplmrx = xpl - ret.x;
        s_int32 yph = y () + height ();
        s_int32 tyh = temp.y + temp.h;
        s_int32 tyhmry = tyh - ret.y;
        s_int32 yphmry = yph - ret.y;


        ret.w = txw < xpl ? txwmrx > 0 ? txwmrx : 0 : xplmrx > 0 ? xplmrx : 0;
        ret.h = tyh < yph ? tyhmry > 0 ? tyhmry : 0 : yphmry > 0 ? yphmry : 0;
        
        return ret;
    }
    else return rect;

}