How to make Animate nested polygons using c graphics in Turbo C++

 

#include <stdio.h>

  #include <conio.h>

  #include <graphics.h>

  #include <dos.h>

  int main() {

        /* request auto detection */

        int gdriver = DETECT, gmode, err;

        int i, midx, midy, x[10];

        /* initialize graphic mode */

        initgraph(&gdriver, &gmode, "C:/TURBOC3/BGI");

        err = graphresult();

        if (err != grOk) {

                /* error occurred */

                printf("Graphics Error: %s\n",

                grapherrormsg(err));

                return 0;

        }

        /* mid position in x and y-axis */

        midx = getmaxx() / 2;

        midy = getmaxy() / 2;

        /* set the position of outermost polygon */

        x[0] = midx, x[1] = midy - 100;

        x[2] = midx + 60,  x[3] = midy - 50;

        x[4] = midx + 40,  x[5] = midy + 50;

        x[6] = midx - 40,  x[7] = midy + 50;

        x[8] = midx - 60,  x[9] = midy - 50;

        x[0] = midx, x[1] = midy - 100 - 125;

        x[2] = midx + 60 + 150,  x[3] = midy - 50 - 100;

        x[4] = midx + 40 + 150,  x[5] = midy + 50 + 150;

        x[6] = midx - 40 - 150,  x[7] = midy + 50 + 150;

        x[8] = midx - 60 - 150,  x[9] = midy - 50 - 100;

        /* drawing nested polygons from out to in */

        for (i = 1; i <= 15; i++) {

                setcolor(i);

                setfillstyle(SOLID_FILL, i);

                fillpoly(5, x);

                x[1] = x[1] + 7;

                x[2] = x[2] - 10;

                x[3] = x[3] + 10;

                x[4] = x[4] - 10;

                x[5] = x[5] - 10;

                x[6] = x[6] + 10;

                x[7] = x[7] - 10;

                x[8] = x[8] + 10;

                x[9] = x[9] + 10;

                sleep(1);

        }

        getch();

        /* deallocate memory allocated for graphic screen */

        closegraph();

        return 0;

  }