Demo 32 of 68 in category RedBook
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# lines.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 geometric primitives and
# their attributes.
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 drawOneLine { x1 y1 x2 y2 } {
glBegin GL_LINES
glVertex2f $x1 $y1
glVertex2f $x2 $y2
glEnd
}
proc CreateCallback { toglwin } {
glClearColor 0.0 0.0 0.0 0.0
glShadeModel GL_FLAT
}
proc DisplayCallback { toglwin } {
glClear GL_COLOR_BUFFER_BIT
# Viewport command is not really needed, but has been inserted for
# Mac OSX. Presentation framework (Tk) does not send a reshape event,
# when switching from one demo to another.
glViewport 0 0 [$toglwin width] [$toglwin height]
# select white for all lines
glColor3f 1.0 1.0 1.0
# in 1st row, 3 lines, each with a different stipple
glEnable GL_LINE_STIPPLE
glLineStipple 1 0x0101 ; # dotted
drawOneLine 50.0 125.0 150.0 125.0
glLineStipple 1 0x00FF ; # dashed
drawOneLine 150.0 125.0 250.0 125.0
glLineStipple 1 0x1C47 ; # dash/dot/dash
drawOneLine 250.0 125.0 350.0 125.0
# in 2nd row, 3 wide lines, each with different stipple
glLineWidth 5.0
glLineStipple 1 0x0101 ; # dotted
drawOneLine 50.0 100.0 150.0 100.0
glLineStipple 1 0x00FF ; # dashed
drawOneLine 150.0 100.0 250.0 100.0
glLineStipple 1 0x1C47 ; # dash/dot/dash
drawOneLine 250.0 100.0 350.0 100.0
glLineWidth 1.0
# in 3rd row, 6 lines, with dash/dot/dash stipple
# as part of a single connected line strip
glLineStipple 1 0x1C47 ; # dash/dot/dash
glBegin GL_LINE_STRIP
for { set i 0 } { $i < 7 } { incr i } {
glVertex2f [expr 50.0 + ($i * 50.0)] 75.0
}
glEnd
#in 4th row, 6 independent lines with same stipple
for { set i 0 } { $i < 6 } { incr i } {
drawOneLine [expr 50.0 + ($i * 50.0)] 50.0 \
[expr 50.0 + (($i+1) * 50.0)] 50.0
}
# in 5th row, 1 line, with dash/dot/dash stipple
# and a stipple repeat factor of 5
glLineStipple 5 0x1C47 ; # dash/dot/dash
drawOneLine 50.0 25.0 350.0 25.0
glDisable GL_LINE_STIPPLE
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
gluOrtho2D 0.0 $w 0.0 $h
}
frame .fr
pack .fr -expand 1 -fill both
togl .fr.toglwin -width 400 -height 150 -double 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 lines"
bind . <Key-Escape> "exit"
.fr.usage insert end "Key-Escape Exit"
.fr.usage configure -state disabled
PrintInfo [tcl3dOglGetInfoString]
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