coor.c

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// $Id: coor.c,v 1.2 2000/06/19 01:54:15 weiym Exp $
//
// Coordinates operations of GDI.
//
// Copyright (C) 2000, Wei Yongming.
//
// Current maintainer: Wei Yongming.

/*
**  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
**  Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
**  MA 02111-1307, USA
*/

// Create date: 2000/06/12, derived from original gdi.c
//
// Modify records:
//
//  Who             When        Where       For What                Status
//-----------------------------------------------------------------------------
//
// TODO:
// 


#include <pthread.h>
#include <semaphore.h>

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

#ifndef lint
static char fileid[] = "$Id: coor.c,v 1.2 2000/06/19 01:54:15 weiym Exp $";
#endif

/************************ 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;
    }
}