Demo 27 of 68 in category RedBook
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# font.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.
#
# Draws some text in a bitmapped font. Uses glBitmap()
# and other pixel routines. Also demonstrates use of
# display lists.
package require tcl3d
set space {
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 }
set letters {
{0x00 0x00 0xc3 0xc3 0xc3 0xc3 0xff 0xc3 0xc3 0xc3 0x66 0x3c 0x18}
{0x00 0x00 0xfe 0xc7 0xc3 0xc3 0xc7 0xfe 0xc7 0xc3 0xc3 0xc7 0xfe}
{0x00 0x00 0x7e 0xe7 0xc0 0xc0 0xc0 0xc0 0xc0 0xc0 0xc0 0xe7 0x7e}
{0x00 0x00 0xfc 0xce 0xc7 0xc3 0xc3 0xc3 0xc3 0xc3 0xc7 0xce 0xfc}
{0x00 0x00 0xff 0xc0 0xc0 0xc0 0xc0 0xfc 0xc0 0xc0 0xc0 0xc0 0xff}
{0x00 0x00 0xc0 0xc0 0xc0 0xc0 0xc0 0xc0 0xfc 0xc0 0xc0 0xc0 0xff}
{0x00 0x00 0x7e 0xe7 0xc3 0xc3 0xcf 0xc0 0xc0 0xc0 0xc0 0xe7 0x7e}
{0x00 0x00 0xc3 0xc3 0xc3 0xc3 0xc3 0xff 0xc3 0xc3 0xc3 0xc3 0xc3}
{0x00 0x00 0x7e 0x18 0x18 0x18 0x18 0x18 0x18 0x18 0x18 0x18 0x7e}
{0x00 0x00 0x7c 0xee 0xc6 0x06 0x06 0x06 0x06 0x06 0x06 0x06 0x06}
{0x00 0x00 0xc3 0xc6 0xcc 0xd8 0xf0 0xe0 0xf0 0xd8 0xcc 0xc6 0xc3}
{0x00 0x00 0xff 0xc0 0xc0 0xc0 0xc0 0xc0 0xc0 0xc0 0xc0 0xc0 0xc0}
{0x00 0x00 0xc3 0xc3 0xc3 0xc3 0xc3 0xc3 0xdb 0xff 0xff 0xe7 0xc3}
{0x00 0x00 0xc7 0xc7 0xcf 0xcf 0xdf 0xdb 0xfb 0xf3 0xf3 0xe3 0xe3}
{0x00 0x00 0x7e 0xe7 0xc3 0xc3 0xc3 0xc3 0xc3 0xc3 0xc3 0xe7 0x7e}
{0x00 0x00 0xc0 0xc0 0xc0 0xc0 0xc0 0xfe 0xc7 0xc3 0xc3 0xc7 0xfe}
{0x00 0x00 0x3f 0x6e 0xdf 0xdb 0xc3 0xc3 0xc3 0xc3 0xc3 0x66 0x3c}
{0x00 0x00 0xc3 0xc6 0xcc 0xd8 0xf0 0xfe 0xc7 0xc3 0xc3 0xc7 0xfe}
{0x00 0x00 0x7e 0xe7 0x03 0x03 0x07 0x7e 0xe0 0xc0 0xc0 0xe7 0x7e}
{0x00 0x00 0x18 0x18 0x18 0x18 0x18 0x18 0x18 0x18 0x18 0x18 0xff}
{0x00 0x00 0x7e 0xe7 0xc3 0xc3 0xc3 0xc3 0xc3 0xc3 0xc3 0xc3 0xc3}
{0x00 0x00 0x18 0x3c 0x3c 0x66 0x66 0xc3 0xc3 0xc3 0xc3 0xc3 0xc3}
{0x00 0x00 0xc3 0xe7 0xff 0xff 0xdb 0xdb 0xc3 0xc3 0xc3 0xc3 0xc3}
{0x00 0x00 0xc3 0x66 0x66 0x3c 0x3c 0x18 0x3c 0x3c 0x66 0x66 0xc3}
{0x00 0x00 0x18 0x18 0x18 0x18 0x18 0x18 0x3c 0x3c 0x66 0x66 0xc3}
{0x00 0x00 0xff 0xc0 0xc0 0x60 0x30 0x7e 0x0c 0x06 0x03 0x03 0xff}
}
# 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 makeRasterFont {} {
global fontOffset
glPixelStorei GL_UNPACK_ALIGNMENT 1
set fontOffset [glGenLists 128]
set j [tcl3dCharToNum "A"]
set len [llength $::letters]
for { set i 0 } { $i < $len } { incr i } {
glNewList [expr $fontOffset + $j] GL_COMPILE
glBitmap 8 13 0.0 2.0 10.0 0.0 [lindex $::letters $i]
glEndList
incr j
}
glNewList [expr $fontOffset + [tcl3dCharToNum " "]] GL_COMPILE
glBitmap 8 13 0.0 2.0 10.0 0.0 $::space
glEndList
}
proc CreateCallback { toglwin } {
glShadeModel GL_FLAT
makeRasterFont
}
proc printString { s } {
global fontOffset
set len [string length $s]
if { $len > 0 } {
glPushAttrib GL_LIST_BIT
glListBase $fontOffset
set sa [tcl3dVectorFromString GLubyte $s]
glCallLists $len GL_UNSIGNED_BYTE $sa
$sa delete
glPopAttrib
}
}
# Everything above this line could be in a library
# that defines a font. To make it work, you've got
# to call makeRasterFont() before you start making
# calls to printString().
#
proc DisplayCallback { toglwin } {
set white { 1.0 1.0 1.0 }
glClear GL_COLOR_BUFFER_BIT
# Viewport command is not really needed, but has been inserted for
# Mac OSX. Presentation framework (Tk) does not send a reshape event,
# when switching from one demo to another.
glViewport 0 0 [$toglwin width] [$toglwin height]
glColor3fv $white
glRasterPos2i 20 60
printString "THE QUICK BROWN FOX JUMPS"
glRasterPos2i 20 40
printString "OVER A LAZY DOG"
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
glOrtho 0.0 $w 0.0 $h -1.0 1.0
glMatrixMode GL_MODELVIEW
}
frame .fr
pack .fr -expand 1 -fill both
togl .fr.toglwin -width 300 -height 100 -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 font"
bind . <Key-Escape> "exit"
.fr.usage insert end "Key-Escape Exit"
.fr.usage configure -state disabled
PrintInfo [tcl3dOglGetInfoString]
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