setvisualpage example in c

Header file:

    graphics.h

Synopsis:

      void setvisualpage(int page);

     

Description:

     setvisualpage() sets the visual graphics page number.

setvisualpage function in c graphics

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

  int main(void) {
        /* select a driver and mode that supports multiple pages. */
        int graphicDriver = EGA, graphicMode = EGAHI;
        int err, midx, midy;

        /* 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));
                getch();
                return 0;
        }

        /* mid position in x and y-axis */
        midx = getmaxx() / 2;
        midy = getmaxy() / 2;


        /*  select the off screen page for drawing */
        setactivepage(1);

        /* output a message on page #1 */
        settextjustify(CENTER_TEXT, CENTER_TEXT);
        outtextxy(midx, 50, "Here is page 1");

        /* draws a circle using the current drawing color */

        setcolor(10);

        setfillstyle(SOLID_FILL, 10);

        circle(midx, midy, 150);

        floodfill(midx, midy, 10);

        /* select drawing to page #0 */

        setactivepage(0);

        /* output a message  on page #0 */

        outtextxy(midx, midy, "Here is page 0.");

        outtextxy(midx, midy+textheight("W"),

                        "Press any key to view page 1:");

        getch();

        /* select page #1 as the visible page */

        setvisualpage(1);

        /* clean up */

        getch();

        closegraph();

        return 0;

  }

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

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