spin

#include<stdio.h>
#include<GL/glut.h>
float vertices[8][3] = {
{-1.0, -1.0, -1.0},
{-1.0, 1.0, -1.0},
{1.0, 1.0, -1.0},
{1.0, -1.0, -1.0},
{-1.0, -1.0, 1.0},
{-1.0, 1.0, 1.0},
{1.0, 1.0, 1.0},
{1.0, -1.0, 1.0}
};
float colors[8][3] = {
{0.0, 0.0, 0.0},
{0.0, 0.0, 1.0},
{0.0, 1.0, 0.0},
{0.0, 1.0, 1.0},
{1.0, 0.0, 0.0},
{1.0, 0.0, 1.0},
{1.0, 1.0, 0.0},
{0.5, 0.5, 0.5}
};
float theta[3] = {0.0, 0.0, 0.0};int axis=0;
void idleFunc() {
    theta[axis] += 1;
    if (theta[axis] > 360.0)
        theta[axis] = 0;
    glutPostRedisplay();
}
void reshape(int w, int h) {
    glViewport(0, 0, w, h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    if (w <= h) {
        glOrtho(-5.0, 5.0, -5.0*(float)h/(float)w, 5.0-(float)h/(float)w, -10.0, 10.0);
    } else {
        glOrtho(-5.0*(float)w/(float)h, 5.0*(float)w/(float)h, -5.0, 5.0, -10.0, 10.0);
    }
    glMatrixMode(GL_MODELVIEW);
    glutPostRedisplay();
}
void drawCubeFace(int a, int b, int c, int d) {
    glBegin(GL_POLYGON);
    glColor3fv(colors[a]);
    glVertex3fv(vertices[a]);
    glColor3fv(colors[b]);
    glVertex3fv(vertices[b]);
    glColor3fv(colors[c]);
    glVertex3fv(vertices[c]);
    glColor3fv(colors[d]);
    glVertex3fv(vertices[d]);
    glEnd();
}
void colorCube() {
    drawCubeFace(1, 0, 2, 3);
    drawCubeFace(5, 4, 7, 6);
    drawCubeFace(1, 2, 6, 5);
    drawCubeFace(0, 4, 7, 3);
    drawCubeFace(2, 3, 7, 6);
    drawCubeFace(5, 4, 0, 1);
}
void display() {
    glClearColor(1.0, 1.0, 1.0, 1.0);
    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
    glLoadIdentity();
    glRotatef(theta[0], 1.0, 0.0, 0.0);
    glRotatef(theta[1], 0.0, 1.0, 0.0);
    glRotatef(theta[2], 0.0, 0.0, 1.0);
    colorCube();
    glFlush();
    glutSwapBuffers();
}
void mouse(int btn, int state, int x, int y) {
    if (btn == GLUT_LEFT_BUTTON && state == GLUT_DOWN)
        axis = 0;
    else if (btn == GLUT_RIGHT_BUTTON && state == GLUT_DOWN)
        axis = 1;
    else if (btn == GLUT_MIDDLE_BUTTON && state == GLUT_DOWN)
        axis = 2;
}
int main(int argc, char* argv[]) {
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB|GLUT_DEPTH);
    glutInitWindowPosition(0, 0);
    glutInitWindowSize(500, 500);
    glutCreateWindow("Spin cube");
    glutReshapeFunc(reshape);
    glutDisplayFunc(display);
    glutIdleFunc(idleFunc);
    glutMouseFunc(mouse);
    glEnable(GL_DEPTH_TEST);
    glutMainLoop();
    return 0;
}