// // File: mycube.c // Author: Matt Daisley // Created: 4/25/2012 // Project: Source code for Make a Cube in OpenGL // Description: Creates an OpenGL window and draws a 3D cube // That the user can rotate using the arrow keys // // Controls: Left Arrow - Rotate Left // Right Arrow - Rotate Right // Up Arrow - Rotate Up // Down Arrow - Rotate Down // ---------------------------------------------------------- // Includes // ---------------------------------------------------------- #include #include #include #define GL_GLEXT_PROTOTYPES #ifdef __APPLE__ #include #else #include #endif // ---------------------------------------------------------- // Function Prototypes // ---------------------------------------------------------- void display(); void specialKeys(); // ---------------------------------------------------------- // Global Variables // ---------------------------------------------------------- double rotate_y=0; double rotate_x=0; // ---------------------------------------------------------- // display() Callback function // ---------------------------------------------------------- void display(){ // Clear screen and Z-buffer glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); // Reset transformations glLoadIdentity(); // Other Transformations // glTranslatef( 0.1, 0.0, 0.0 ); // Not included // glRotatef( 180, 0.0, 1.0, 0.0 ); // Not included // Rotate when user changes rotate_x and rotate_y glRotatef( rotate_x, 1.0, 0.0, 0.0 ); glRotatef( rotate_y, 0.0, 1.0, 0.0 ); // Other Transformations // glScalef( 2.0, 2.0, 0.0 ); // Not included //Multi-colored side - FRONT glBegin(GL_POLYGON); glColor3f( 1.0, 0.0, 0.0 ); glVertex3f( 0.5, -0.5, -0.5 ); // P1 is red glColor3f( 0.0, 1.0, 0.0 ); glVertex3f( 0.5, 0.5, -0.5 ); // P2 is green glColor3f( 0.0, 0.0, 1.0 ); glVertex3f( -0.5, 0.5, -0.5 ); // P3 is blue glColor3f( 1.0, 0.0, 1.0 ); glVertex3f( -0.5, -0.5, -0.5 ); // P4 is purple glEnd(); // White side - BACK glBegin(GL_POLYGON); glColor3f( 1.0, 1.0, 1.0 ); glVertex3f( 0.5, -0.5, 0.5 ); glVertex3f( 0.5, 0.5, 0.5 ); glVertex3f( -0.5, 0.5, 0.5 ); glVertex3f( -0.5, -0.5, 0.5 ); glEnd(); // Purple side - RIGHT glBegin(GL_POLYGON); glColor3f( 1.0, 0.0, 1.0 ); glVertex3f( 0.5, -0.5, -0.5 ); glVertex3f( 0.5, 0.5, -0.5 ); glVertex3f( 0.5, 0.5, 0.5 ); glVertex3f( 0.5, -0.5, 0.5 ); glEnd(); // Green side - LEFT glBegin(GL_POLYGON); glColor3f( 0.0, 1.0, 0.0 ); glVertex3f( -0.5, -0.5, 0.5 ); glVertex3f( -0.5, 0.5, 0.5 ); glVertex3f( -0.5, 0.5, -0.5 ); glVertex3f( -0.5, -0.5, -0.5 ); glEnd(); // Blue side - TOP glBegin(GL_POLYGON); glColor3f( 0.0, 0.0, 1.0 ); glVertex3f( 0.5, 0.5, 0.5 ); glVertex3f( 0.5, 0.5, -0.5 ); glVertex3f( -0.5, 0.5, -0.5 ); glVertex3f( -0.5, 0.5, 0.5 ); glEnd(); // Red side - BOTTOM glBegin(GL_POLYGON); glColor3f( 1.0, 0.0, 0.0 ); glVertex3f( 0.5, -0.5, -0.5 ); glVertex3f( 0.5, -0.5, 0.5 ); glVertex3f( -0.5, -0.5, 0.5 ); glVertex3f( -0.5, -0.5, -0.5 ); glEnd(); glFlush(); glutSwapBuffers(); } // ---------------------------------------------------------- // specialKeys() Callback Function // ---------------------------------------------------------- void specialKeys( int key, int x, int y ) { // Right arrow - increase rotation by 5 degree if (key == GLUT_KEY_RIGHT) rotate_y += 5; // Left arrow - decrease rotation by 5 degree else if (key == GLUT_KEY_LEFT) rotate_y -= 5; else if (key == GLUT_KEY_UP) rotate_x += 5; else if (key == GLUT_KEY_DOWN) rotate_x -= 5; // Request display update glutPostRedisplay(); } // ---------------------------------------------------------- // main() function // ---------------------------------------------------------- int main(int argc, char* argv[]){ // Initialize GLUT and process user parameters glutInit(&argc,argv); // Request double buffered true color window with Z-buffer glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH); // Create window glutCreateWindow("Awesome Cube"); // Enable Z-buffer depth test glEnable(GL_DEPTH_TEST); // Callback functions glutDisplayFunc(display); glutSpecialFunc(specialKeys); // Pass control to GLUT for events glutMainLoop(); // Return to OS return 0; }
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