pgrect.cpp

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/*
    ParaGUI - crossplatform widgetset
    Copyright (C) 2000,2001,2002  Alexander Pipelka
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.
 
    This library 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
    Library General Public License for more details.
 
    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
    Alexander Pipelka
    pipelka@teleweb.at
 
    Last Update:      $Author: mbickel $
    Update Date:      $Date: 2007-04-13 16:16:01 $
    Source File:      $Source: /home/cvspsrv/cvsroot/games/asc/source/libs/paragui/src/draw/pgrect.cpp,v $
    CVS/RCS Revision: $Revision: 1.2 $
    Status:           $State: Exp $
*/

#include "pgrect.h"

PG_Rect PG_Rect::null;

PG_Rect::PG_Rect(Sint16 xv, Sint16 yv, Uint16 wv, Uint16 hv) :
                my_xpos(x),
                my_ypos(y),
                my_width(w),
                my_height(h),
                index(0),
                my_next(NULL),
my_prev(NULL) {
        SetRect(xv, yv, wv, hv);
}

PG_Rect::PG_Rect(const PG_Rect& src) :
                my_xpos(x),
                my_ypos(y),
                my_width(w),
                my_height(h),
                my_next(NULL),
my_prev(NULL) {
        *this = src;
}

PG_Rect::PG_Rect(const SDL_Rect& src) :
                my_xpos(x),
                my_ypos(y),
                my_width(w),
                my_height(h),
                my_next(NULL),
my_prev(NULL) {
        *this = src;
}

PG_Rect::~PG_Rect() {}

PG_Rect PG_Rect::IntersectRect(const PG_Rect& p, const PG_Rect& c) {
        static int px0,py0,px1,py1;
        static int cx0,cy0,cx1,cy1;
        static int rx0,ry0,rx1,ry1;

        // fill in default (NULL) result rectangle
        PG_Rect result;

        // get coordinates of the rectangles
        px0 = p.my_xpos;
        py0 = p.my_ypos;
        px1 = p.my_xpos + p.my_width - 1;
        py1 = p.my_ypos + p.my_height - 1;

        cx0 = c.my_xpos;
        cy0 = c.my_ypos;
        cx1 = c.my_xpos + c.my_width - 1;
        cy1 = c.my_ypos + c.my_height - 1;

        // check if the rectangles intersect
        if((cx1 < px0) || (cx0 > px1) || (cy1 < py0) || (cy0 > py1))
                return result;

        // intersect x
        if(cx0 <= px0)
                rx0 = px0;
        else
                rx0 = cx0;

        if(cx1 >= px1)
                rx1 = px1;
        else
                rx1 = cx1;

        // intersect y
        if(cy0 <= py0)
                ry0 = py0;
        else
                ry0 = cy0;

        if(cy1 >= py1)
                ry1 = py1;
        else
                ry1 = cy1;

        // fill in result rect
        result.SetRect(
            rx0,
            ry0,
            (rx1-rx0)+1,
            (ry1-ry0)+1);

        return result;
}

PG_Rect PG_Rect::IntersectRect(const PG_Rect& p) const {
        return IntersectRect(p, *this);
}

PG_Rect& PG_Rect::operator =(const PG_Rect& src) {
        SetRect(src.x, src.y, src.w, src.h);
        my_next = NULL;
        my_prev = NULL;
        return *this;
}

PG_Rect PG_Rect::operator / ( const PG_Rect& b) const {
        return IntersectRect(b);
}

PG_Rect& PG_Rect::operator =(const SDL_Rect& src) {
        x = src.x;
        y = src.y;
        w = src.w;
        h = src.h;
        return *this;
}

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