gluLookAt by keyboard

gluLookAt()関数を使って、キーボードを使ってカメラをパンできるようになりました。使用するキーは次の通り。
# u(+y) i(-z)
# h(-x) j(reset) k(+x)
# n(+z) m(-y)
レンズの光軸の指す点を３次元座標で指定するのですが、たとえばキー"k"を押すと、その座標が+1されて、カメラがちょっと右向きます。すると景色は左に動きます。

I can pan the camera by using gluLookAt() command and keyboard. Push a key, u, i, h,j,k,n, or m, camera will pan accordingly.
# u(+y) i(-z)
# h(-x) j(reset) k(+x)
# n(+z) m(-y)
For example, push 'k' key once, x=x+1. You pan right your camera to a point x+1, y, z. Thus, objects you are seeing will move to left.

import sys
from OpenGL.GL import *
from OpenGL.GLU import *
from OpenGL.GLUT import *

# draw x, y, z axis with index
# draw 3 sphere
# use keyboard to pan camera from a position (20,20,20)
#
#     u(+y) i(-z)
#  h(-x)  j(reset) k(+x)
#    n(+z) m(-y)

def display():
  glClear(GL_COLOR_BUFFER_BIT)
  axis()
  glColor3f(0.0, 1.0, 0.0)
  mySphere = gluNewQuadric()
  gluQuadricDrawStyle(mySphere, GLU_LINE)
  
  glTranslatef(0.0, 0.0, -5.0)
  gluSphere(mySphere, 2.0, 12, 12)
  
  glTranslatef(0.0, 0.0, 10.0)
  gluSphere(mySphere, 1.0, 12, 12)
  
  glTranslatef(0.0, -5.0, 0.0)
  glRotatef(90.0, 0.0, 1.0, 0.0)
  gluSphere(mySphere, 1.0, 12, 12)
  
  glFlush()
  
def axis():
  glClear( GL_COLOR_BUFFER_BIT )
  
  glBegin(GL_LINES)
  glColor3f(0.3, 0.3, 0.3)
  glVertex3f(-10.0, 0.0, 0.0)
  glVertex3f(10.0, 0.0, 0.0)
  glVertex3f(0.0, -10.0, 0.0)
  glVertex3f(0.0, 10.0, 0.0)
  glVertex3f(0.0, 0.0, -10.0)
  glVertex3f(0.0, 0.0, 10.0)
  glEnd()

  biggest = 10
  x = 88
  y = 89
  z = 90
  r = range (0,(biggest+1))
  for i in r:
    ascii = 48+i

    # x axis positive
    glRasterPos3f(i, 0.0, 0.0)
    glColor3f(0.3, 0.3, 0.3)
    if i==biggest:
      glutBitmapCharacter(GLUT_BITMAP_8_BY_13, x )
    else:
      glutBitmapCharacter(GLUT_BITMAP_8_BY_13, ascii)
    # x axis negative
    glRasterPos3f(-i, 0.0, 0.0)
    glColor3f(0.5, 0.0, 0.0)
    if i==biggest:
      glutBitmapCharacter(GLUT_BITMAP_8_BY_13, x)
    else:
      glutBitmapCharacter(GLUT_BITMAP_8_BY_13, ascii)

    # y axis positive
    glRasterPos3f(0.0, i, 0.0)
    glColor3f(0.3, 0.3, 0.3)
    if i==biggest:
      glutBitmapCharacter(GLUT_BITMAP_8_BY_13, y)
    else:
      glutBitmapCharacter(GLUT_BITMAP_8_BY_13, ascii)
    # x axis negative
    glRasterPos3f(0.0, -i, 0.0)
    glColor3f(0.5, 0.0, 0.0)
    if i==biggest:
      glutBitmapCharacter(GLUT_BITMAP_8_BY_13, y)
    else:
      glutBitmapCharacter(GLUT_BITMAP_8_BY_13, ascii)

    # z axis positive
    glRasterPos3f(0.0, 0.0, i)
    glColor3f(0.3, 0.3, 0.3)
    if i==biggest:
      glutBitmapCharacter(GLUT_BITMAP_8_BY_13, z)
    else:
      glutBitmapCharacter(GLUT_BITMAP_8_BY_13, ascii)
    # z axis negative
    glRasterPos3f(0.0, 0.0, -i)
    glColor3f(0.5, 0.0, 0.0)
    if i==biggest:
      glutBitmapCharacter(GLUT_BITMAP_8_BY_13, z)
    else:
      glutBitmapCharacter(GLUT_BITMAP_8_BY_13, ascii)
  
  glFlush()
  
def init():
  glClearColor(0.0, 0.0, 0.0, 0.0)
  glColor3f(0.0, 0.0, 0.0)
  glMatrixMode(GL_PROJECTION)
  glLoadIdentity()
  gluPerspective(30, 1.0, 0.0, 100.0)
  glMatrixMode(GL_MODELVIEW)
  glLoadIdentity()
  gluLookAt(20.0, 20.0, 20.0, xx, yy, zz, 0.0, 1.0, 0.0)
  
def mymouse(but, stat, x, y):
  if stat == GLUT_DOWN:
    if but == GLUT_LEFT_BUTTON:
      print x, y, "Press right button to exit"
    else:
      sys.exit()

def myidle():
  glutPostRedisplay()

def mykey(key, x, y):
  global xx, yy, zz
  if key=='k': # +x
    xx = xx + 1.0
    print "xx=", xx
  elif key=='h': # -x
    xx = xx - 1.0
    print "xx=", xx
  elif key=='u': #+y
    yy = yy + 1.0
    print "yy=", yy
  elif key=='m': #-y
    yy = yy - 1.0
    print "yy=", yy
  elif key=='i': #-z
    zz = zz - 1.0
    print "zz=", zz
  elif key=='n': #+z
    zz = zz + 1.0
    print "zz=", zz
  elif key=='j': # center camera to origin 0,0
    xx=yy=zz=0.0
    print "reset x,y,z to (0,0)"

  glMatrixMode(GL_MODELVIEW)
  glLoadIdentity()
  gluLookAt(20.0, 20.0, 20.0, xx, yy, zz, 0.0, 1.0, 0.0)
  glutPostRedisplay()

glutInit( sys.argv )
glutInitDisplayMode( GLUT_SINGLE | GLUT_RGB )
glutInitWindowSize( 500, 500 )
glutInitWindowPosition(0,0)
glutCreateWindow( 'model' )
glutDisplayFunc( display )
glutMouseFunc(mymouse)
glutKeyboardFunc(mykey)
xx=yy=zz=0.0
init()
glutMainLoop()