Write a C Program to implement 3-D rotation in Graphics

Below is the source code for C Program to implement 3-D rotation in Graphics which is successfully compiled and run on Windows System to produce desired output as shown below :

SOURCE CODE :

/*  C Program to implement 3-D rotation in Graphics  */

#include <stdio.h>
#include <graphics.h>
#include <math.h>
#include <stdlib.h>
#include <dos.h>
#include <conio.h>
 
#define ORG -50
 
double face1[5][2] = {
                            { 250, 125 },
                            { 350, 125 },
                            { 350, 225 },
                            { 250, 225 },
                            { 250, 125 }
                           };
 
double face2[5][2] = {
                            { 250+ORG, 125-ORG },
                            { 350+ORG, 125-ORG },
                            { 350+ORG, 225-ORG },
                            { 250+ORG, 225-ORG },
                            { 250+ORG, 125-ORG }
                           };
 
double angle = 5.0 * M_PI / 180;
double midx1, midy1, midx2, midy2;
 
void rotate (void)
{
    int i;
    for (i=0; i<5; i++)
    {
        double xnew, ynew;
 
        xnew = midx1 + (face1[i][0] - midx1) * cos (angle) -
               (face1[i][1] - midy1) * sin (angle);
        ynew = midy1 + (face1[i][0] - midx1) * sin (angle) +
                (face1[i][1] - midy1) * cos (angle);
 
        face1[i][0] = xnew;
        face1[i][1] = ynew;
 
        xnew = midx2 + (face2[i][0] - midx2) * cos (angle) -
                (face2[i][1] - midy2) * sin (angle);
        ynew = midy2 + (face2[i][0] - midx2) * sin (angle) +
                (face2[i][1] - midy2) * cos (angle);
 
        face2[i][0] = xnew;
        face2[i][1] = ynew;
    }
 
    cleardevice();
 
    for (i=0; i<4; i++)
    {
        setcolor(7);
        line (face1[i][0], face1[i][1], face1[i+1][0], face1[i+1][1]);
        setcolor(8);
        line (face2[i][0], face2[i][1], face2[i+1][0], face2[i+1][1]);
        setcolor(9);
        line (face1[i][0], face1[i][1], face2[i][0], face2[i][1]);
    }
 
    delay (125);
}
 
void main()
{
    int gd = DETECT, gm;
 
    midx1 = (face1[0][0] + face1[1][0]) / 2.0;
    midy1 = (face1[1][1] + face1[2][1]) / 2.0;
    midx2 = (face2[0][0] + face2[1][0]) / 2.0;
    midy2 = (face2[1][1] + face2[2][1]) / 2.0;
 
    initgraph (&gd, &gm, "..\\bgi");
 
    while (!kbhit())
        rotate();
 
    closegraph();
}

Above is the source code for C Program to implement 3-D rotation in Graphics which is successfully compiled and run on Windows System.The Output of the program is shown above .