From: "I Know Not" <nobody AT nowhere DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Someone Please Help me draw a line!!!
Lines: 109
Message-ID: <GuIw1.1413$Wb1.761593920@newsreader.digex.net>
Date: Sat, 01 Aug 1998 17:45:10 GMT
NNTP-Posting-Host: 204.91.8.224
NNTP-Posting-Date: Sat, 01 Aug 1998 13:45:10 EDT
Organization: DIGEX, Inc. - Beltsville, MD - http://www.digex.net
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Precedence: bulk

Ladies and Gents of the DJGPP world:

As a newbie, I understand that this question may be quite stupid, but I must
ask.  After reading many different readme and info files I finally achieved
for the monitor to give me a sign that it actually changed to a mode 13h --
the graphics mode.  However it will not show a pixel, a box or a line.
Nothing.  It goes to the graphics mode and comes right back to the text
(regular) mode and finishes the program.  Here is the program that I am
trying to work with:

#include <dpmi.h>
#include <libgrx.h>
#include <clipping.h>
#include "conio.h"
#include "sys/farptr.h"

/*-----------------THE LINE FUNCTION-----------------------*/

void GrLine(int x1,int y1,int x2,int y2,GrColor c)
 {
 clip_line(CURC,x1,y1,x2,y2);
 mouse_block(CURC,x1,y1,x2,y2);
 (*FDRV->drawline)(
     x1 + CURC->gc_xoffset,
     y1 + CURC->gc_yoffset,
     x2 - x1,
     y2 - y1,
     c
 );
 mouse_unblock();
 }

/*----------------------THE BOX FUNCTION-------------------*/

void GrBox(int x1,int y1,int x2,int y2,GrColor c)
{
 int ox1,oy1,ox2,oy2;
 isort(x1,x2); ox1 = x1; ox2 = x2;
 isort(y1,y2); oy1 = y1; oy2 = y2;
 clip_ordbox(CURC,x1,y1,x2,y2);
 mouse_block(CURC,x1,y1,x2,y2);
 if(!(oy1 -= y1)) (*FDRV->drawhline)(
     x1 + CURC->gc_xoffset,
     y1 + CURC->gc_yoffset,
     x2 - x1 + 1,
     c
 );
 if(!(oy2 -= y2) && ((y1 != y2) || oy1)) (*FDRV->drawhline)(
     x1 + CURC->gc_xoffset,
     y2 + CURC->gc_yoffset,
     x2 - x1 + 1,
     c
 );
 if((y2 = y2 - (oy1 ? y1 : ++y1) + (oy2 ? 1 : 0)) > 0) {
     if(!(ox1 -= x1)) (*FDRV->drawvline)(
  x1 + CURC->gc_xoffset,
  y1 + CURC->gc_yoffset,
  y2,
  c
     );
     if((ox2 == x2) && ((x1 != x2) || ox1)) (*FDRV->drawvline)(
  x2 + CURC->gc_xoffset,
  y1 + CURC->gc_yoffset,
  y2,
  c
     );
 }
 mouse_unblock();
}

/*---------------------------THE VIDEO MODE FUNCTION------------*/

void initgraph(void) {
  __dpmi_regs regs;
  regs.x.ax = 0x13;
  __dpmi_int(0x10,&regs);
}


void closegraph(void) {
  __dpmi_regs regs;
  regs.x.ax = 0x3;
  __dpmi_int(0x10,&regs);
}

/*-----------------------THE MAIN FUNCTION------------------*/

int main(void)
{

initgraph();

GrLine(100, 100, 200, 200, 15);
GrBox( 150, 150, 220, 220, 15);

closegraph();

getch();

return 0;

}

Could someone please explain how to draw a line?  Please!!!

Thank you very much, I will check back to see if any replies have been
posted.