cg/3.c at master · mohammedlutf/cg · GitHub

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#include <GL/glut.h>
GLfloat vertices[][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}};
GLfloat normals[][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}};
GLfloat colors[][3]={{0.0,1.0,0.0},{1.0,1.0,0.0},{0.0,1.0,0.0},{0.0,1.0,0.0},{0.0,0.0,1.0},{1.0,0.0,1.0},{1.0,1.0,1.0},{0.0,1.0,1.0}};

static GLfloat theta[]={0.0,0.0,0.0};
static GLint axis=2;
void polygon(int a,int b,int c,int d)
{
        glLineWidth(10);
        glBegin(GL_POLYGON);

        glColor3fv(colors[a]);
        glNormal3fv(normals[a]);
        glVertex3fv(vertices[a]);
        glColor3fv(colors[b]);
        glNormal3fv(normals[b]);
        glVertex3fv(vertices[b]);
        glColor3fv(colors[c]);
        glNormal3fv(normals[c]);
        glVertex3fv(vertices[c]);
        glColor3fv(colors[d]);
        glNormal3fv(normals[d]);
        glVertex3fv(vertices[d]);
        glEnd();
}

void colorcube(void)
{
    polygon(0,3,2,1);
    polygon(2,3,7,6);
    polygon(0,4,7,3);
    polygon(1,2,6,5);
    polygon(4,5,6,7);
    polygon(0,1,5,4);
}


void display(void)
{
    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 spinCube()
{
    theta[axis] += 0.01;
    if(theta[axis]>360.0) theta[axis] =0.0;
    glutPostRedisplay();
}

void mouse(int btn,int state,int x,int y)
{
    if(btn==GLUT_LEFT_BUTTON && state==GLUT_DOWN) axis=0;
    if(btn==GLUT_MIDDLE_BUTTON && state==GLUT_DOWN) axis=1;
    if(btn==GLUT_RIGHT_BUTTON && state==GLUT_DOWN) axis=2;
}

void myReshape(int w,int h)
{
    glViewport(0,0,w,h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    if(w <= h)
      glOrtho(-2.0,2.0,-2.0,2.0,-10.0,10.0);
    else
    glOrtho(-2.0,2.0,-2.0, 2.0,-10.0,10.0);
    glMatrixMode(GL_MODELVIEW);
}

int main(int argc, char **argv)
{
    glutInit(&argc,argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
    glutInitWindowSize(500,500);
    glutCreateWindow("program3");
    glutReshapeFunc(myReshape);
    glutDisplayFunc(display);
    glutIdleFunc(spinCube);
    glutMouseFunc(mouse);
    glEnable(GL_DEPTH_TEST);
    glutMainLoop();
    return 0 ;
}