Simple Animation Program Using C Graphics

#include <graphics.h>

#include <stdlib.h>

#include <stdio.h>

#include <conio.h>

#define ARROW_SIZE 10

void draw_arrow(int x, int y);

int main(void)

{

   /* request autodetection */

   int gdriver = DETECT, gmode, errorcode;

   void *arrow;

   int x, y, maxx;

   unsigned int size;

   /* initialize graphics and local variables */

   initgraph(&gdriver, &gmode, "..//bgi");

   /* 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();

   x = 0;

   y = getmaxy() / 2;

   /* draw the image to be grabbed */

   draw_arrow(x, y);

   /* calculate the size of the image */

   size = imagesize(x, y-ARROW_SIZE, x+(4*ARROW_SIZE), y+ARROW_SIZE);

   /* allocate memory to hold the image */

   arrow = malloc(size);

   /* grab the image */

   getimage(x, y-ARROW_SIZE, x+(4*ARROW_SIZE), y+ARROW_SIZE, arrow);

   /* repeat until a key is pressed */

   while (!kbhit())

   {

      /* erase old image */

      putimage(x, y-ARROW_SIZE, arrow, XOR_PUT);

      x += ARROW_SIZE;

      if (x >= maxx)

          x = 0;

      /* plot new image */

      putimage(x, y-ARROW_SIZE, arrow, XOR_PUT);

   }

   /* clean up */

   free(arrow);

   closegraph();

   return 0;

}

void draw_arrow(int x, int y)

{

   /* draw an arrow on the screen */

   moveto(x, y);

   linerel(4*ARROW_SIZE, 0);

   linerel(-2*ARROW_SIZE, -1*ARROW_SIZE);

   linerel(0, 2*ARROW_SIZE);

   linerel(2*ARROW_SIZE, -1*ARROW_SIZE);

}

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