PyOpenGL GLUT Menu

Menuing Options

1. GLUT (triggering not easy)
2. python menu ?
3. add dependancy GUI toolkit

glutAttachMenu

• google:glutAttachMenu
  • https://www.opengl.org/documentation/specs/glut/spec3/node44.html

Usage:

void glutAttachMenu(int button);
void glutDetachMenu(int button);

glutAttachMenu attaches a mouse button for the current window to the identifier of the current menu; glutDetachMenu detaches an attached mouse button from the current window. By attaching a menu identifier to a button, the named menu will be popped up when the user presses the specified button. button should be one of GLUT_LEFT_BUTTON, GLUT_MIDDLE_BUTTON, and GLUT_RIGHT_BUTTON. Note that the menu is attached to the button by identifier, not by reference.

OSX Trackpad and GLUT buttons

GLUT_XXX_BUTTON	trackpad menu triggering
LEFT	light tap
MIDDLE	unable to trigger it
RIGHT	two finger press

• http://www.opengl.org/resources/libraries/glut/spec3/node50.html

OSX GLUT

• http://iihm.imag.fr/blanch/software/glut-macosx/

Examples

delta:e blyth$ pyopengl-
delta:e blyth$ pyopengl-demo-cd

delta:PyOpenGL-Demo blyth$ find . -name '*.py' -exec grep -l Menu {} \;
./GLE/maintest.py
./GLUT/glutplane.py
./proesch/simple/simpleInteraction.py
./tom/demo.py

GLE/maintest.py

2-finger click on trackpad with cursor inside the GLUT window raises the EXIT button menu (this is GLUT_RIGHT_BUTTON):

(chroma_env)delta:~ blyth$ pyopengl-
(chroma_env)delta:~ blyth$ python $(pyopengl-demo-dir)/GLE/texas.py

GLE/maintest.py:

def JoinStyle (msg):
    sys.exit(0)

def main(DrawStuff):
    global glutDisplayFunc, glutMotionFunc
    # initialize glut
    glutInit(sys.argv)
    glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH)
    glutCreateWindow("basic demo")
    glutDisplayFunc(DrawStuff)
    glutMotionFunc(MouseMotion)

    # create popup menu */
    glutCreateMenu (JoinStyle)
    glutAddMenuEntry ("Exit", 99)
    glutAttachMenu (GLUT_RIGHT_BUTTON)

    # initialize GL */
    glClearDepth (1.0)
    glEnable (GL_DEPTH_TEST)
    glClearColor (0.0, 0.0, 0.0, 0.0)
    glShadeModel (GL_SMOOTH)

    glMatrixMode (GL_PROJECTION)

GLUT/glutplane.py

Hmm, a 4 item menu : but its not very easy to use (two finger clicking and menu selection would be tricky with a large menu).

(chroma_env)delta:GLUT blyth$ python $(pyopengl-demo-dir)/GLUT/glutplane.py
RIGHT-CLICK to display the menu.

GLUT/glutplane.py:

VOID, ADD_PLANE, REMOVE_PLANE, MOTION_ON, MOTION_OFF, QUIT = range(6)

def domotion_on():
    moving = GL_TRUE
    glutChangeToMenuEntry(3, "Motion off", MOTION_OFF)
    glutIdleFunc(animate)
    return

def domotion_off():
    moving = GL_FALSE
    glutChangeToMenuEntry(3, "Motion", MOTION_ON)
    glutIdleFunc(None)
    return

def doquit():
    sys.exit(0)
    return

menudict ={ADD_PLANE : add_plane,
           REMOVE_PLANE : remove_plane,
           MOTION_ON : domotion_on,
           MOTION_OFF: domotion_off,
           QUIT : doquit}

def dmenu(item):
    menudict[item]()
    return 0

///
///  dmenu is the menu callback that gets called with the menu entry enum integer
///

glutCreateMenu(dmenu)
glutAddMenuEntry("Add plane", ADD_PLANE)
glutAddMenuEntry("Remove plane", REMOVE_PLANE)
glutAddMenuEntry("Motion", MOTION_ON)
glutAddMenuEntry("Quit", QUIT)
glutAttachMenu(GLUT_RIGHT_BUTTON)

# setup OpenGL state

$(pyopengl-demo-dir)/proesch/simple/simpleInteraction.py:

097 MENU_RED, MENU_GREEN, MENU_BLUE, MENU_QUIT = 0, 1, 2, 3
098 colors = [ [1, 0, 0], [0, 1, 0], [0, 0, 1] ]
099 def handleMenu( selection ):
100     """Callback function (menu).
101
102     Glut menus are not supported in PyOpenGL-3.0.0a6"""
103
104     global colors, rP
105     if selection == MENU_QUIT:
106         sys.exit()
107     elif MENU_RED <= selection <= MENU_BLUE:
108         rP.drawColor = colors[ selection ]
109     else:
110         print 'Warning: illegel Menu entry'
111     glutPostRedisplay( )
112
113 def initMenus( ):
114     global handleMenu
115     colorMenu = glutCreateMenu( handleMenu )
116     glutAddMenuEntry( "red", MENU_RED )
117     glutAddMenuEntry( "green", MENU_GREEN )
118     glutAddMenuEntry( "blue", MENU_BLUE )
119     glutCreateMenu( handleMenu )
120     glutAddSubMenu( "color", colorMenu)
121     glutAddMenuEntry( "quit", MENU_QUIT )
122     glutAttachMenu( GLUT_RIGHT_BUTTON )
123

Hmm unable to trigger the menu:

(chroma_env)delta:pyopengl_glut blyth$ pyopengl-
(chroma_env)delta:pyopengl_glut blyth$ python $(pyopengl-demo-dir)/proesch/simple/simpleInteraction.py