setviewport example in c

Header file:

    graphics.h

Synopsis:

      void setviewport(int left, int top, int right, int bottom, int clip);

     (left, top) - top left corner

     (right, bottom) - bottom right corner

     clip - If the clip value is non-zero, all drawings will be truncated to current view port

     

Description:

     setviewport() sets a new view port for graphics output.

setviewport function in c graphics

---

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

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

        /* draws a rectangle using current drawing color */
        setcolor(9);
        setfillstyle(SLASH_FILL, 9);
        rectangle(0, 0, 50, 50);
        floodfill(1, 1, 9);

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

        /* create a smaller viewport */
        setviewport(midx - 100, midy - 100,
                        midx + 100, midy + 100, 1);

        /* draws a rectangle using current drawing color */

        setcolor(11);

        setfillstyle(BKSLASH_FILL, 11);

        rectangle(0, 0, 50, 50);

        floodfill(1, 1, 11);

        /* clean up */

        getch();

        closegraph();

        return 0;

  }

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

---