boxcirc.c Example C Language Program

/*
boxcirc.c:

A simple example which draw a 2d box and circle, press ESCape key
to exit.
*/

#include <gl/gl.h>
#include <gl/device.h>

main()
{    

   int   dev,val;    

   initialize();    

   while (TRUE) {        
      if (qtest()) {            
         dev = qread(&val);            
         if (dev == ESCKEY) {
            gexit();
            exit();
         }
         else if (dev == REDRAW) {
            reshapeviewport();
            drawboxcirc();
         }
      }
   }
}

initialize()
{

   int gid;

   prefposition(XMAXSCREEN/4, XMAXSCREEN*3/4, YMAXSCREEN/4, 
       YMAXSCREEN*3/4);

   gid = winopen("boxcirc");
   qdevice(ESCKEY);
   qdevice(REDRAW);
   qenter(REDRAW,gid);

}

drawboxcirc()
{

   pushmatrix();
   translate(200.0, 200.0, 0.0);
   color(BLACK);
   clear();
   color(BLUE);
   recti(0, 0, 100, 100);
   color(RED);
   circi(50, 50, 50);
   popmatrix();

}

Related Information

The circ subroutine, clear subroutine, color or colorf subroutine.