OpenGL 정육면제 회전하기

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#include <gl/glut.h> #include <stdio.h> #include <math.h> #include <iostream> using namespace std;     #define PI 3.1415926   float   x, y, z; float   radius; float   theta; float   phi;    GLfloat vertices[][3] = {      { -1.0, -1.0,  1.0 },   // 0       { -1.0,  1.0,  1.0 },   // 1      {  1.0,  1.0,  1.0 },   // 2      {  1.0, -1.0,  1.0 },   // 3      { -1.0, -1.0, -1.0 },   // 4      { -1.0,  1.0, -1.0 },   // 5      {  1.0,  1.0, -1.0 },   // 6      {  1.0, -1.0, -1.0 }};  // 7         GLfloat colors[][3] = {      { 1.0, 0.0, 0.0 },      // red      { 1.0, 1.0, 0.0 },      // yellow      { 0.0, 1.0, 0.0 },      // green      { 0.0, 0.0, 1.0 },      // blue      { 1.0, 1.0, 1.0 },      // white      { 1.0, 0.0, 1.0 }};     // magenta         void polygon(int a, int b, int c, int d)   {      glColor3fv(colors[a]);            glBegin(GL_POLYGON);          glVertex3fv(vertices[a]);          glVertex3fv(vertices[b]);          glVertex3fv(vertices[c]);          glVertex3fv(vertices[d]);      glEnd();  }         // 6개의 면을 만든다.  void createCube(void)   {      polygon(0, 3, 2, 1);    // front      polygon(2, 3, 7, 6);    // right      polygon(3, 0, 4, 7);    // bottom      polygon(4, 5, 6, 7);    // back      polygon(1, 2, 6, 5);    // top      polygon(5, 4, 0, 1);    // right  }         void init (void)  {      glClearColor (0.0, 0.0, 0.0, 0.0) ;          glColor3f(1.0, 1.0, 0.0);      glEnable(GL_DEPTH_TEST);    // 깊이 활성화  }         void reshape (int w, int h)  {      glViewport(0, 0, w, h);      glMatrixMode (GL_PROJECTION);        glLoadIdentity();      //glOrtho (-5.0, 5.0, -5.0, 5.0, -5.0, 5.0);     gluPerspective(60.0, 1.0, 1.0, 100.0);  // 멀고 가까움을 표현.           radius = 10.0;     theta = 10.0;       phi = -10.0; }         void display (void)  {      x = radius * cos(phi) * cos(theta);      y = radius * cos(phi) * sin(theta);      z = radius * sin(phi);             glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);      glMatrixMode (GL_MODELVIEW);          glLoadIdentity();      gluLookAt(x, y, z, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0);      // (앞의 세 인자는 카메라의 위치, 중간의 세 인자는 카메라의 초점,      //  뒤의 세 인자는 법선벡터 방향 (0, 1, 0))으로 해줘야 세워져 보인다.            glBegin(GL_LINES);  // X, Y, Z 선 표시          glColor3f(1.0, 0.0, 0.0); // X축           glVertex3f(0.0, 0.0, 0.0);          glVertex3f(10.0, 0.0, 0.0);                 glColor3f(0.0, 1.0, 0.0); // Y축           glVertex3f(0.0, 0.0, 0.0);          glVertex3f(0.0, 10.0, 0.0);                 glColor3f(0.0, 0.0, 1.0); // Z축           glVertex3f(0.0, 0.0, 0.0);          glVertex3f(0.0, 0.0, 10.0);      glEnd();            createCube();   // 큐브 생성             glFlush ();       glutSwapBuffers();  }    void specialKey(int key, int x, int y) {          switch(key)         {         case GLUT_KEY_LEFT:         theta -= 0.1;             break;         case GLUT_KEY_RIGHT:                 theta += 0.1;                 break;         case GLUT_KEY_UP:                 phi += 0.1;                 break;         case GLUT_KEY_DOWN:                 phi -= 0.1;                 break;         }               glutPostRedisplay();           if ( theta > 2.0 * PI )      // 360도 넘어가면                 theta -= (2.0 * PI);         else if ( theta < 0.0 )                 theta += (2.0 * PI); }        void main (int argc, char** argv)  {      glutInit (&argc, argv);          glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH );        glutInitWindowPosition (100, 100);          glutInitWindowSize (500, 500);         glutCreateWindow ("Cube");        init();       glutDisplayFunc (display);         glutReshapeFunc (reshape);      glutSpecialFunc(specialKey);     glutIdleFunc(display);      glutMainLoop();      } ;