putpixel

Syntax

#include <graphics.h>
void putpixel(int x, int y, int color);

Description

putpixel plots a point in the color defined by color at (x,y).

Return Value

None.

Windows Notes

The winbgim version allows the color argument to be an ordinary BGI color (from 0 to 15) or an RGB color.

See also

getpixel

putimage

Example

/* putpixel example */ 

#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
#include <dos.h>

#define PIXEL_COUNT 1000
#define DELAY_TIME  100  /* in milliseconds */

int main()
{
   /* request autodetection */
   int gdriver = DETECT, gmode, errorcode;
   int i, x, y, color, maxx, maxy, maxcolor, seed;

   /* initialize graphics and local variables */
   initgraph(&gdriver, &gmode, "");

   /* read result of initialization */
   errorcode = graphresult();

   if (errorcode != grOk) {  /* an error occurred */
      printf("Graphics error: %s\n", grapherrormsg(errorcode));
      printf("Press any key to halt:");
      getch();
      exit(1);               /* terminate with an error code */
   }

   maxx = getmaxx() + 1;
   maxy = getmaxy() + 1;
   maxcolor = getmaxcolor() + 1;

   while (!kbhit())
   {
      /* seed the random number generator */
      seed = random(32767);
      srand(seed);
      for (i=0; i<PIXEL_COUNT; i++) {

         x = random(maxx);
         y = random(maxy);
         color = random(maxcolor);
         putpixel(x, y, color);
      }
      delay(DELAY_TIME);
      srand(seed);
      for (i=0; i<PIXEL_COUNT; i++) {
         x = random(maxx);
         y = random(maxy);
         color = random(maxcolor);
         if (color == getpixel(x, y))
            putpixel(x, y, 0);
      }
   }

   /* clean up */
   getch();
   closegraph();
   return 0;
}