Solar System in Computer Graphics using C

Problem statement : Write a C program to draw a solar system using computer graphics

Code

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


  /* manipulates the position of planets on the orbit */
  void planetMotion(int xrad, int yrad, int midx, int midy, int x[60], int y[60]) {
        int i, j = 0;

        /* positions of planets in their corresponding orbits */
        for (i = 360; i > 0; i = i - 6) {
                x[j] = midx - (xrad * cos((i * 3.14) / 180));
                y[j++] = midy - (yrad * sin((i * 3.14) / 180));
        }
        return;
  }

  int main() {
        /* request auto detection */
        int gdriver = DETECT, gmode, err;
        int i = 0, midx, midy;
        int xrad[9], yrad[9], x[9][60], y[9][60];
        int pos[9], planet[9], tmp;

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

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

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

        /* manipulating radius of all 9 planets */
        planet[0] = 7;
        for (i = 1; i < 9; i++) {
                planet[i] = planet[i - 1] + 1;
        }

        /* offset position for the planets on their corresponding orbit */
        for (i = 0; i < 9; i++) {
                pos[i] = i * 6;
        }

        /* orbits for all 9 planets */
        xrad[0] = 60, yrad[0] = 30;
        for (i = 1; i < 9; i++) {
                xrad[i] = xrad[i - 1] + 30;
                yrad[i] = yrad[i - 1] + 15;
        }

        /* positions of planets on their corresponding orbits */
        for (i = 0; i < 9; i++) {
                planetMotion(xrad[i], yrad[i], midx, midy, x[i], y[i]);
        }

        while (!kbhit()) {
                /* drawing 9 orbits */
                setcolor(WHITE);
                for (i = 0; i < 9; i++) {
                        ellipse(midx, midy, 0, 360, xrad[i], yrad[i]);
                }

                /* sun at the mid of the solar system */
                setcolor(YELLOW);
                setfillstyle(SOLID_FILL, YELLOW);
                circle(midx, midy, 20);
                floodfill(midx, midy, YELLOW);

                /* mercury in first orbit */
                setcolor(CYAN);
                setfillstyle(SOLID_FILL, CYAN);
                pieslice(x[0][pos[0]], y[0][pos[0]], 0, 360, planet[0]);


                /* venus in second orbit */
                setcolor(GREEN);
                setfillstyle(SOLID_FILL, GREEN);
                pieslice(x[1][pos[1]], y[1][pos[1]], 0, 360, planet[1]);

                /* earth in third orbit */
                setcolor(BLUE);
                setfillstyle(SOLID_FILL, BLUE);
                pieslice(x[2][pos[2]], y[2][pos[2]], 0, 360, planet[2]);

                /* mars in fourth orbit */
                setcolor(RED);
                setfillstyle(SOLID_FILL, RED);
                pieslice(x[3][pos[3]], y[3][pos[3]], 0, 360, planet[3]);

                /* jupiter in fifth orbit */
                setcolor(BROWN);
                setfillstyle(SOLID_FILL, BROWN);
                pieslice(x[4][pos[4]], y[4][pos[4]], 0, 360, planet[4]);

                /* saturn in sixth orbit */
                setcolor(LIGHTGRAY);
                setfillstyle(SOLID_FILL, LIGHTGRAY);
                pieslice(x[5][pos[5]], y[5][pos[5]], 0, 360, planet[5]);

                /* uranus in sevth orbit */
                setcolor(BROWN);
                setfillstyle(SOLID_FILL, BROWN);
                pieslice(x[6][pos[6]], y[6][pos[6]], 0, 360, planet[6]);

                /* neptune in eigth orbit */
                setcolor(LIGHTBLUE);
                setfillstyle(SOLID_FILL, LIGHTBLUE);
                pieslice(x[7][pos[7]], y[7][pos[7]], 0, 360, planet[7]);

                /* pluto in ninth orbit */
                setcolor(LIGHTRED);
                setfillstyle(SOLID_FILL, LIGHTRED);
                pieslice(x[8][pos[8]], y[8][pos[8]], 0, 360, planet[8]);

                /* checking for one complete rotation */
                for (i = 0; i < 9; i++) {
                        if (pos[i] <= 0) {
                                pos[i] = 59;
                        } else {
                                pos[i] = pos[i] - 1;
                        }
                }

                /* sleep for 2000 milliseconds */
                delay(2000);

                /* clears graphic screen */
                cleardevice();
        }

        /* deallocate memory allocated for graphic screen */
        closegraph();
        return 0;
  }

Output :

Run this Program