coor.c

miniucgui1.30版本的源码

/*
** $Id: coor.c,v 1.7 2003/09/04 03:09:52 weiym Exp $
**
** Coordinates operations of GDI.
**
** Copyright (C) 2003 Feynman Software.
** Copyright (C) 2000 ~ 2002 Wei Yongming.
**
** Current maintainer: Wei Yongming.
**
** Create date: 2000/06/12, derived from original gdi.c
*/

/*
** This program 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.
**
** This program 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 this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

/*
** TODO:
*/ 

#include "common.h"
#include "minigui.h"
#include "gdi.h"
#include "window.h"
#include "cliprect.h"
#include "gal.h"
#include "internals.h"
#include "ctrlclass.h"
#include "dc.h"

/************************ Coordinate system transfer *************************/
void GUIAPI SPtoLP(HDC hdc, POINT* pPt)
{
    if (hdc == HDC_SCREEN) return;

    coor_SP2LP ((PDC)hdc, &pPt->x, &pPt->y);
}

void GUIAPI LPtoSP(HDC hdc, POINT* pPt)
{
    if (hdc == HDC_SCREEN) return;

    coor_LP2SP ((PDC)hdc, &pPt->x, &pPt->y);
}

void GUIAPI LPtoDP(HDC hdc, POINT* pPt)
{
    PDC pdc;

    pdc = dc_HDC2PDC(hdc);

    if (pdc->mapmode != MM_TEXT) {
        pPt->x = (pPt->x - pdc->WindowOrig.x)
             * pdc->ViewExtent.x / pdc->WindowExtent.x
             + pdc->ViewOrig.x;

        pPt->y = (pPt->y - pdc->WindowOrig.y)
             * pdc->ViewExtent.y / pdc->WindowExtent.y
             + pdc->ViewOrig.y;
    }
}

void GUIAPI DPtoLP (HDC hdc, POINT* pPt)
{
    PDC pdc;

    pdc = dc_HDC2PDC (hdc);

    if (pdc->mapmode != MM_TEXT) {
        pPt->x = (pPt->x - pdc->ViewOrig.x)
             * pdc->WindowExtent.x / pdc->ViewExtent.x
             + pdc->WindowOrig.x;

        pPt->y = (pPt->y - pdc->ViewOrig.y)
             * pdc->WindowExtent.y / pdc->ViewExtent.y
             + pdc->WindowOrig.y;
    }
}