Moon Rotation - Animation using C graphics

Animate moon rotation using C graphics

  #include <stdio.h>
  #include <conio.h>
  #include <graphics.h>
  #include <dos.h>
  #include <math.h>

  /* finds the location of moon on the virtual orbit around earth */
  void moonMotion(int radius, int midx, int midy, int x[60], int y[60]) {
        int i, j = 0;

        /* positions of moon around the earth */
        for (i = 360; i > 0; i = i - 6) {
                x[j] = midx - (radius * cos((i * 3.14) / 180));
                y[j++] = midy - (radius * sin((i * 3.14) / 180));
        }
        return;
  }


  int main() {
        /* request auto detection */
        int gdriver = DETECT, gmode, err;
        int midx, midy, earth, orbit, moon;
        int i = 0, x[60], y[60];

        /* initialize graphic mode */
        initgraph(&gdriver, &gmode, "C:/TURBOC3/BGI");
        err = graphresult();

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

        earth = 50, orbit = 100, moon = 25;

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

        midx = getmaxx() / 2;

        midy = getmaxy() / 2;

        /* get the positions of moon around earth for rotation */

        moonMotion(orbit, midx, midy, x, y);

        while(!kbhit()) {

                /* drawing earth at the center */

                setcolor(BLUE);

                setfillstyle(SOLID_FILL, BLUE);

                pieslice(midx, midy, 0, 360, earth);

                /* drawing virtual orbit around the earth */

                setcolor(WHITE);

                setlinestyle(DASHED_LINE, 1, 1);

                circle(midx, midy, orbit);

                /* rotate moon around the earth */

                setcolor(YELLOW);

                setfillstyle(SOLID_FILL, YELLOW);

                setlinestyle(SOLID_LINE, 1, 1);

                pieslice(x[i], y[i], 0, 360, moon);

                /* sleep for 200 milliseconds */

                delay(200);

                /* clears the graphic screen */

                cleardevice();

                /* checks for one complete rotation */

                i = (i + 1) % 60;

        }

        /* deallocate memory allocated for graphic screen */

        closegraph();

        return 0;

  }

Output: (Moon Rotation - Animation using C graphics)

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