Category : OS/2 Files
Archive   : BEZIER.ZIP
Filename : BEZIER.C

 
Output of file : BEZIER.C contained in archive : BEZIER.ZIP


/*-------------------------------------------------------------------
BEZIER.C -- GPI Bezier Spline Demonstration Program
(c) 1989, Charles Petzold and Ziff Communications Co.
PC Magazine, Volume 8, Number 19
-------------------------------------------------------------------*/

#define INCL_WIN
#define INCL_GPI
#include

MRESULT EXPENTRY ClientWndProc (HWND, USHORT, MPARAM, MPARAM) ;

int main (void)
{
static CHAR szClientClass[] = "Bezier" ;
static ULONG flFrameFlags = FCF_TITLEBAR | FCF_SYSMENU |
FCF_SIZEBORDER | FCF_MINMAX |
FCF_SHELLPOSITION | FCF_TASKLIST ;
HAB hab ;
HMQ hmq ;
HWND hwndFrame, hwndClient ;
QMSG qmsg ;

hab = WinInitialize (0) ;
hmq = WinCreateMsgQueue (hab, 0) ;

WinRegisterClass (hab, szClientClass, ClientWndProc, CS_SIZEREDRAW, 0) ;

hwndFrame = WinCreateStdWindow (HWND_DESKTOP, WS_VISIBLE,
&flFrameFlags, szClientClass, NULL,
0L, NULL, 0, &hwndClient) ;

while (WinGetMsg (hab, &qmsg, NULL, 0, 0))
WinDispatchMsg (hab, &qmsg) ;

WinDestroyWindow (hwndFrame) ;
WinDestroyMsgQueue (hmq) ;
WinTerminate (hab) ;
return 0 ;
}

VOID DrawSpline (HPS hps, POINTL *pptlEnd1, POINTL *pptlEnd2,
POINTL *pptlCtl1, POINTL *pptlCtl2)
{
POINTL aptl[4] ;

// Set 4 point structures

aptl[0] = *pptlEnd1 ;
aptl[1] = *pptlCtl1 ;
aptl[2] = *pptlCtl2 ;
aptl[3] = *pptlEnd2 ;

// Draw dotted straight lines

GpiSetLineType (hps, LINETYPE_ALTERNATE) ;
GpiMove (hps, aptl + 0) ;
GpiLine (hps, aptl + 1) ;
GpiMove (hps, aptl + 3) ;
GpiLine (hps, aptl + 2) ;

// Draw spline

GpiSetLineType (hps, LINETYPE_SOLID) ;

GpiMove (hps, aptl) ;
GpiPolySpline (hps, 3L, aptl + 1) ;
}

MRESULT EXPENTRY ClientWndProc (HWND hwnd, USHORT msg, MPARAM mp1, MPARAM mp2)
{
static BOOL fButton1Down, fButton2Down ;
static POINTL ptlEnd1, ptlEnd2, ptlCtl1, ptlCtl2 ;
HPS hps ;
SHORT cxClient, cyClient ;

switch (msg)
{
case WM_SIZE:
cxClient = SHORT1FROMMP (mp2) ;
cyClient = SHORT2FROMMP (mp2) ;

ptlEnd1.x = cxClient / 3 ;
ptlEnd1.y = cyClient / 2 ;

ptlEnd2.x = 2 * cxClient / 3 ;
ptlEnd2.y = cyClient / 2 ;

ptlCtl1.x = cxClient / 2 ;
ptlCtl1.y = 3 * cyClient / 4 ;

ptlCtl2.x = cxClient / 2 ;
ptlCtl2.y = cyClient / 4 ;
return 0 ;

case WM_BUTTON1DOWN:
if (!fButton2Down)
{
WinSetCapture (HWND_DESKTOP, hwnd) ;
fButton1Down = TRUE ;
}
else
WinAlarm (HWND_DESKTOP, WA_ERROR) ;

break ;

case WM_BUTTON2DOWN:
if (!fButton1Down)
{
WinSetCapture (HWND_DESKTOP, hwnd) ;
fButton2Down = TRUE ;
}
else
WinAlarm (HWND_DESKTOP, WA_ERROR) ;

break ;

case WM_BUTTON1UP:
if (fButton1Down)
{
WinSetCapture (HWND_DESKTOP, NULL) ;
fButton1Down = FALSE ;
}
break ;

case WM_BUTTON2UP:
if (fButton2Down)
{
WinSetCapture (HWND_DESKTOP, NULL) ;
fButton2Down = FALSE ;
}
break ;

case WM_MOUSEMOVE:
if (!fButton1Down && !fButton2Down)
break ;

hps = WinGetPS (hwnd) ;
GpiSetColor (hps, CLR_BACKGROUND) ;
DrawSpline (hps, &ptlEnd1, &ptlEnd2, &ptlCtl1, &ptlCtl2) ;

if (fButton1Down)
{
ptlCtl1.x = MOUSEMSG(&msg)->x ;
ptlCtl1.y = MOUSEMSG(&msg)->y ;
}
else
{
ptlCtl2.x = MOUSEMSG(&msg)->x ;
ptlCtl2.y = MOUSEMSG(&msg)->y ;
}

GpiSetColor (hps, CLR_NEUTRAL) ;
DrawSpline (hps, &ptlEnd1, &ptlEnd2, &ptlCtl1, &ptlCtl2) ;
WinReleasePS (hps) ;
break ;

case WM_PAINT:
hps = WinBeginPaint (hwnd, NULL, NULL) ;
GpiErase (hps) ;

DrawSpline (hps, &ptlEnd1, &ptlEnd2, &ptlCtl1, &ptlCtl2) ;

WinEndPaint (hps) ;
return 0 ;
}
return WinDefWindowProc (hwnd, msg, mp1, mp2) ;
}



  3 Responses to “Category : OS/2 Files
Archive   : BEZIER.ZIP
Filename : BEZIER.C

  1. Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!

  2. This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.

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