#include<stdlib.h>
#include<stdio.h>
#include<GL/glut.h>
#include<math.h>
float v[8][3] = { {-1,-1,1},{-1,1,1},{1,1,1},{1,-1,1},{-1,-1,-1},{-1,1,-1},{1,1,-1},{1,-1,-1} };
float p[8][3] = { {0,0,1},{0,1,1},{1,1,1},{1,0,1},{0,0,0},{0,1,0},{1,1,0},{1,0,0} };
float theta[3] = { 0,0,0 };
int flag = 2;
void myinit()
{
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-2, 2, -2, 2, -2, 2);
glMatrixMode(GL_MODELVIEW);
}
void idlefunc()
{
theta[flag]++;
if (theta[flag] > 360)theta[flag] = 0;
glutPostRedisplay();
}
void mousefunc(int button, int status, int x, int y)
{
if (button == GLUT_LEFT_BUTTON && status == GLUT_DOWN)
flag = 2;
if (button == GLUT_MIDDLE_BUTTON && status == GLUT_DOWN)
flag = 1;
if (button == GLUT_RIGHT_BUTTON && status == GLUT_DOWN)
flag = 0;
}
void drawpoly(int a, int b, int c, int d)
{
glBegin(GL_POLYGON);
glColor3fv(p[a]);
glVertex3fv(v[a]);
glColor3fv(p[b]);
glVertex3fv(v[b]);
glColor3fv(p[c]);
glVertex3fv(v[c]);
glColor3fv(p[d]);
glVertex3fv(v[d]);
glEnd();
}
void colorcube()
{
drawpoly(0, 1, 2, 3);
drawpoly(0, 1, 5, 4);
drawpoly(1, 5, 6, 2);
drawpoly(4, 5, 6, 7);
drawpoly(3, 2, 6, 7);
drawpoly(0, 4, 7, 3);
}
void display()
{
glClearColor(1, 1, 1, 1);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glColor3f(1, 0, 0);
glEnable(GL_DEPTH_TEST);
glLoadIdentity();
glRotatef(theta[0], 1, 0, 0);
glRotatef(theta[1], 0, 1, 0);
glRotatef(theta[2], 0, 0, 1);
colorcube();
glFlush();
glutSwapBuffers();
}
void main()
{
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
glutInitWindowPosition(100, 100);
glutInitWindowSize(500, 500);
glutCreateWindow(“cube rotation”);
myinit();
glutDisplayFunc(display);
glutMouseFunc(mousefunc);
glutIdleFunc(idlefunc);
glutMainLoop();
}
