clearviewport example in c

Header file:

    graphics.h

Synopsis:

     void clearviewport();

Description:

      clearviewport() clears the current view port and resets the current position to (0, 0), relative to the current view port.

clearviewport function in c graphics

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  #include <graphics.h>
  #include <stdlib.h>
  #include <stdio.h>
  #include <conio.h>
  #include <dos.h>
  #define CLIP_ON 1   /* activates clipping in viewport */

  int main(void) {
        /* request auto detection */
        int graphicDriver = DETECT, graphicMode;
        int err, i;

        /* initialize graphics and local variables */
        initgraph(&graphicDriver,
                &graphicMode, "C:/TURBOC3/BGI");

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

        if (err != grOk) {
                 /* an error occurred */
                printf("Graphic Error: %s\n",
                                grapherrormsg(err));
                return 0;
        }

        setcolor(getmaxcolor());

        /* message in default full-screen viewport */
        outtextxy(0, 0, "Default viewport(0, 0)");

        /* create a smaller viewport */
        setviewport(50, 50, getmaxx()-50, getmaxy()-50, CLIP_ON);

        /* draw arcs in current viewport */
        for (i = 1; i < 200; i = i + 2) {
                arc(0, 0, 245, 360, i);
                delay(200);
        }

        /* clears the current viewport */
        clearviewport();

        /* output another message */
        outtextxy(0, 0, "Cleared Sub View Port(0, 0)!!");

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

  }

Output: (clearviewport built-in function in c graphics.h)

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