立方体旋转- OpenGL

我需要openGL和旋转方面的帮助。这是我的代码:

#include <math.h>
#include <GL/glut.h>

float transZ=50;      
float rotateA=0;         
float rotateAspeed=0.0;
void cube (float dimX, float dimY, float dimZ)
{
   glMatrixMode(GL_MODELVIEW);
   glPushMatrix();

      glTranslatef(0,dimY/2,0);
      glScalef(dimX/2, dimY/2, dimZ/2);

  glBegin(GL_QUADS);        
    glColor3f(0.0, 1.0, 0.0);    // Color Green - TOP
    glVertex3f(1.0, 1.0, 1.0); // TOP-RIGHT-NEAR
    glVertex3f(-1.0, 1.0, 1.0); // TOP-LEFT-NEAR
    glVertex3f(-1.0, 1.0, -1.0); //TOP-LEFT-FAR
    glVertex3f(1.0, 1.0, -1.0); // TOP-RIGHT-FAR
    glColor3f(1.0, 0.0, 0.0); // Color RED - Bottom
    glVertex3f(1.0, -1.0, 1.0); //BOTTOM-RIGHT-NEAR
    glVertex3f(-1.0, -1.0, 1.0); //BOTTOM-LEFT-NEAR
    glVertex3f(-1.0, -1.0, -1.0); //BOTTOM-LEFT-FAR
    glVertex3f(1.0, -1.0, -1.0); //BOTTOM-RIGHT-FAR
    glColor3f(1.0, 1.0, 0.0); // Color Yellow - Back
    glVertex3f(1.0, 1.0, -1.0); //TOP-RIGHT-FAR
    glVertex3f(-1.0, 1.0, -1.0); //TOP-LEFT-FAR
    glVertex3f(-1.0, -1.0, -1.0); //BOTTOM-LEFT-FAR
    glVertex3f(1.0, -1.0, -1.0); //BOTTOM-RIGHT-FAR
    glColor3f(0.0, 0.0, 1.0); //Color Blue - RIGHT
    glVertex3f(1.0, 1.0, 1.0); //TOP-FRONT-NEAR
    glVertex3f(1.0, 1.0, -1.0); //TOP-BACK-FAR
    glVertex3f(1.0, -1.0, -1.0); //BOTTOM-BACK-FAR
    glVertex3f(1.0, -1.0, 1.0); //BOTTOM-FRONT-NEAR
    glColor3f(1.0, 0.5, 0.0); //Color Orange - Left
    glVertex3f(-1.0, 1.0, 1.0); //TOP-FRONT-NEAR
    glVertex3f(-1.0, 1.0, -1.0); //TOP-BACK-FAR
    glVertex3f(-1.0, -1.0, -1.0);//BOTTOM-BACK-FAR
    glVertex3f(-1.0, -1.0, 1.0); //BOTTOM-FRONT-NEAR


  glEnd();

   glPopMatrix();
}

void display(void)
{

   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );

   glMatrixMode(GL_MODELVIEW);
   glLoadIdentity();

   gluLookAt(transZ*cos(rotateA),10,transZ*sin(rotateA), 0,10,0, 0,1,0);

   cube(30,30,30);

   glFlush();            
   glutSwapBuffers();
}
void init (void)
{
   glClearColor(1.0, 1.0, 1.0, 1.0);
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
   glFrustum(-1, 1, -1, 1, 1, 1000);

   glEnable(GL_DEPTH_TEST); 
}

void keyboard(unsigned char key, int x, int y)
{
   switch (key) {
      case 27:                
         exit(0);
         break;
      case 'S':
         transZ+=1.0f;
         glutPostRedisplay();  
         break;
      case 'W':
         transZ-=1.0f;
         if (transZ<0) transZ=0;
         glutPostRedisplay();  
         break;
      case 's':
         transZ+=0.5f;
         glutPostRedisplay();  
         break;
      case 'w':
         transZ-=0.5f;
         if (transZ<0) transZ=0;
         glutPostRedisplay(); 
         break;
      case 'A':
         rotateAspeed+=0.001f;
         glutPostRedisplay();  
         break;
      case 'a':
         rotateAspeed+=0.001f;
         glutPostRedisplay();  
         break;
      case 'D':
         rotateAspeed-=0.001f;
         glutPostRedisplay();  
         break;
      case 'd':
         rotateAspeed-=0.001f;
         glutPostRedisplay();  
         break;
   }
}
void idle(void)
{
  rotateA=rotateA + rotateAspeed;
  glutPostRedisplay();    
}

int main(int argc, char** argv)
{
   glutInit(&argc, argv);
   glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
   glutInitWindowSize (500, 500);
   glutInitWindowPosition (100, 100);
   glutCreateWindow ("Cube");
   init ();
   glutDisplayFunc(display);
   glutIdleFunc(idle); 
   glutKeyboardFunc(keyboard); 
   glutMainLoop();
   return 0;
}

当我按下A或D时，立方体水平旋转，但我需要使，当我按下，例如J时，立方体开始垂直旋转。有什么帮助吗?