tpbig.c Example C Language Program

/*
tpbig.c:

Basic graphics program demonstrating arcs, polygons, character
strings, and use of a textport.
*/

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

long cone[][2] = {100, 300, 150, 100, 200, 300};
char *singlechar;

main()
{
   int gid;
   short val;    
   singlechar = malloc(2); /* Space for a character and a Null */
   memcpy(singlechar, "X", 2);
   prefposition(0,XMAXSCREEN,0,YMAXSCREEN); 

   gid = winopen("tpbig");
   qdevice(ESCKEY);
   qdevice(REDRAW);
   qenter(REDRAW,gid); 
   reshapeviewport();
   drawstuff();
   textport(50,300,750,900); 
   tpon();     
   while(TRUE) {
      switch(qread(&val)) {
      case ESCKEY:
         gexit();
         exit();            
      case REDRAW:
         reshapeviewport();
         drawstuff();
      }

   }

}
drawstuff()
{    
   register long i, j;             /* draw an ice-cream cone */
   color(WHITE);
   clear();
   color(YELLOW);
   polf2i(3, cone);                /* draw the ice-cream cone */
   color(GREEN);                   /* first scoop is mint */
   arcfi(150, 300, 50, 0, 1800);   /* only half of it shows */
   color(RED);                     /* second scoop is cherry */
   circf(150.0, 400.0, 50.0);
   color(BLACK);
   poly2i(3, cone);                /* outline the cone in black */

   /* Next, draw a few filled and unfilled arcs in the upper
   * left corner of the screen.
    */  
  arcf(100.0, 650.0, 40.0, 450, 2700);
   arci(100, 500, 40, 450, 2700);    
   arcfi(250, 650, 80, 2700, 450);
   arc(250.0, 500.0, 80.0, 2700, 450);

  /* Now, put up a series of filled and unfilled rectangles with
   * the names of their colors printed inside of them across the
   * rest of the top of the screen.
    */
   color(GREEN);
   recti(400, 600, 550, 700);
   cmov2i(420, 640);
   charstr("Green");    
   color(RED);
   rectfi(600, 600, 800, 650);
   color(BLACK);
   cmov2(690.0, 620.0);
   charstr("Red");    
   color(BLUE);
   rect(810.0, 700.0, 1000.0, 20.0);
   cmov2i(900, 300);
   charstr("Blue");
   /* Now draw some text with a ruler on top to measure it by. */
   /* First the ruler: */  

  color(BLACK);    
   move2i(300, 400);
   draw2i(650, 400);
   for (i = 300; i <= 650; i += 10) {
      move2i(i, 400);
      draw2i(i, 410);
   }

     /* Then some text: */ 
  cmov2i(300, 380);
   charstr("The first line is drawn ");
   charstr("in two parts.");    
   cmov2i(300, 368);
   charstr("This line is only 12 pixels lower.");    
   cmov2i(300, 354);
   charstr("Now move down 14 pixels ...");    
   cmov2i(300, 338);
   charstr("And now down 16 ...");    
   cmov2i(300, 320);
   charstr("Now 18 ...");    
   cmov2i(300, 300);
   charstr("And finally, 20 pixels.");

   /* Finally, show off the entire font.  The cmov2i() before 
    * each character is necessary in case that character is not 
    * defined.
     */
   for (i = 0; i < 4; i++)
      for (j = 0; j < 32; j++) {
         cmov2i(300 + 9*j, 200 - 18*i);
         *singlechar = (char)(32*i + j);
         charstr(singlechar);
      }
   for (i = 0; i < 4; i++) {
      cmov2i(300, 100 - 18*i);
      for (j = 0; j < 32; j++) {
         *singlechar = (char)(32*i + j);
         charstr(singlechar);
      }
   }

}

/*
  Changes:
         - Changed memcopy(singlechar, "X", 2); to memcpy ...
        - Added the & in this statement:
          switch(qread(&val)) {
      - Removed the textinit(); call for case ESCKEY
*/

Related Information

The arc subroutine , arcf subroutine , circf subroutine , polf subroutine , poly subroutine , rect subroutine , rectf subroutine , tpon subroutine .