Demo 48 of 68 in category RedBook
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# quadric.tcl
#
# An example of the OpenGL red book modified to work with Tcl3D.
# The original C sources are Copyright (c) 1993-2003, Silicon Graphics, Inc.
# The Tcl3D sources are Copyright (c) 2005-2022, Paul Obermeier.
# See file LICENSE for complete license information.
#
# This program demonstrates the use of some of the gluQuadric*
# routines. Quadric objects are created with some quadric
# properties and the callback routine to handle errors.
# Note that the cylinder has no top or bottom and the circle
# has a hole in it.
package require tcl3d
# Font to be used in the Tk listbox.
set listFont {-family {Courier} -size 10}
# Show errors occuring in the Togl callbacks.
proc bgerror { msg } {
tk_messageBox -icon error -type ok -message "Error: $msg\n\n$::errorInfo"
exit
}
# Print info message into widget a the bottom of the window.
proc PrintInfo { msg } {
if { [winfo exists .fr.info] } {
.fr.info configure -text $msg
}
}
proc CreateCallback { toglwin } {
set mat_ambient { 0.5 0.5 0.5 1.0 }
set mat_specular { 1.0 1.0 1.0 1.0 }
set mat_shininess { 50.0 }
set light_position { 1.0 1.0 1.0 0.0 }
set model_ambient { 0.5 0.5 0.5 1.0 }
glClearColor 0.0 0.0 0.0 0.0
glMaterialfv GL_FRONT GL_AMBIENT $mat_ambient
glMaterialfv GL_FRONT GL_SPECULAR $mat_specular
glMaterialfv GL_FRONT GL_SHININESS $mat_shininess
glLightfv GL_LIGHT0 GL_POSITION $light_position
glLightModelfv GL_LIGHT_MODEL_AMBIENT $model_ambient
glEnable GL_LIGHTING
glEnable GL_LIGHT0
glEnable GL_DEPTH_TEST
# Create 4 display lists, each with a different quadric object.
# Different drawing styles and surface normal specifications
# are demonstrated.
#
set ::startList [glGenLists 4]
set qobj [gluNewQuadric]
gluQuadricDrawStyle $qobj GLU_FILL ; # smooth shaded
gluQuadricNormals $qobj GLU_SMOOTH
glNewList $::startList GL_COMPILE
gluSphere $qobj 0.75 15 10
glEndList
gluQuadricDrawStyle $qobj GLU_FILL ; # flat shaded
gluQuadricNormals $qobj GLU_FLAT
glNewList [expr $::startList+1] GL_COMPILE
gluCylinder $qobj 0.5 0.3 1.0 15 5
glEndList
gluQuadricDrawStyle $qobj GLU_LINE ; # all polygons wireframe
gluQuadricNormals $qobj GLU_NONE
glNewList [expr $::startList+2] GL_COMPILE
gluDisk $qobj 0.25 1.0 20 4
glEndList
gluQuadricDrawStyle $qobj GLU_SILHOUETTE ; # boundary only
gluQuadricNormals $qobj GLU_NONE
glNewList [expr $::startList+3] GL_COMPILE
gluPartialDisk $qobj 0.0 1.0 20 4 0.0 225.0
glEndList
}
proc DisplayCallback { toglwin } {
glClear [expr $::GL_COLOR_BUFFER_BIT | $::GL_DEPTH_BUFFER_BIT]
# Viewport command is not really needed, but has been inserted for
# Mac OSX. Presentation framework (Tk) does not send a reshape event,
# when switching from one demo to another.
glViewport 0 0 [$toglwin width] [$toglwin height]
glPushMatrix
glEnable GL_LIGHTING
glShadeModel GL_SMOOTH
glTranslatef -1.0 -1.0 0.0
glCallList $::startList
glShadeModel GL_FLAT
glTranslatef 0.0 2.0 0.0
glPushMatrix
glRotatef 300.0 1.0 0.0 0.0
glCallList [expr $::startList+1]
glPopMatrix
glDisable GL_LIGHTING
glColor3f 0.0 1.0 1.0
glTranslatef 2.0 -2.0 0.0
glCallList [expr $::startList+2]
glColor3f 1.0 1.0 0.0
glTranslatef 0.0 2.0 0.0
glCallList [expr $::startList+3]
glPopMatrix
glFlush
$toglwin swapbuffers
}
proc ReshapeCallback { toglwin { w -1 } { h -1 } } {
set w [$toglwin width]
set h [$toglwin height]
glViewport 0 0 $w $h
glMatrixMode GL_PROJECTION
glLoadIdentity
if { $w <= $h } {
glOrtho -2.5 2.5 \
[expr -2.5*double($h)/double($w)] [expr 2.5*double($h)/double($w)] \
-10.0 10.0
} else {
glOrtho [expr -2.5*double($w)/double($h)] \
[expr 2.5*double($w)/double($h)] \
-2.5 2.5 -10.0 10.0
}
glMatrixMode GL_MODELVIEW
glLoadIdentity
}
frame .fr
pack .fr -expand 1 -fill both
togl .fr.toglwin -width 500 -height 500 -double true -depth true \
-createcommand CreateCallback \
-reshapecommand ReshapeCallback \
-displaycommand DisplayCallback
listbox .fr.usage -font $::listFont -height 1
label .fr.info
grid .fr.toglwin -row 0 -column 0 -sticky news
grid .fr.usage -row 1 -column 0 -sticky news
grid .fr.info -row 2 -column 0 -sticky news
grid rowconfigure .fr 0 -weight 1
grid columnconfigure .fr 0 -weight 1
wm title . "Tcl3D demo: OpenGL Red Book example quadric"
bind . <Key-Escape> "exit"
.fr.usage insert end "Key-Escape Exit"
.fr.usage configure -state disabled
PrintInfo [tcl3dOglGetInfoString]
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