Rotated Text Font
Keith Vetter 2007-09-17 : A while ago I needed text angled 90 degrees down for labels on a graph. Initially I used the code from Quick Photo Rotation, but then I decided to cache the results, thereby essentially creating my own rotated font.
It works by combining gif images of individual letters creating an image with the requested text at a 90 degree rotation. Not very flexible, but fits my needs.
##+##########################################################################
#
# rotatedFont.tcl -- simple vertical font
# by Keith Vetter
#
package require Tk
namespace eval ::RotatedFont {
variable ALPHA ;# Rotated text
array set ALPHA {
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}
}
proc ::RotatedFont::CreateRotateTextImage {txt} {
variable ALPHA ;# Alphabet images
set ltxt {}
set h 0
foreach ch [split $txt ""] { ;# Pass1: create chars, get size
scan $ch %c ch
if {! [info exists ALPHA($ch)]} { set ch 63 }
lappend ltxt $ch
set iname "::img::rot::$ch"
if {[lsearch [image names] $iname] == -1} {
image create photo $iname -data $ALPHA($ch)
}
incr h [image height $iname]
}
set img [image create photo -width 21 -height $h]
set y 0
foreach ch $ltxt {
$img copy ::img::rot::$ch -to 0 $y
incr y [image height ::img::rot::$ch]
}
return $img
}
# Demo code
pack [canvas .c]
set x 100
foreach word {"Now is the" "time for all" "good men" "to come to the aid" "of their country"} {
set img [::RotatedFont::CreateRotateTextImage $word]
.c create image [incr x -13] 10 -image $img -anchor nw
}
returnAlso see "Rotate text and images using img extension", "Rotate text on a canvas", "Vector Font"...
KBK 2008-11-03 I was sufficiently intrigued with this idea to do it directly in the canvas, creating 'line' items for the rotated text. There's a demonstrator in the Half Bakery at https://wiki.tcl-lang.org/_repo/hershey/