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# hscale.tcl --
#
# This demonstration script shows an example with a horizontal scale.
if {![info exists widgetDemo]} {
error "This script should be run from the \"widget\" demo."
}
package require Tk
set w .hscale
catch {destroy $w}
toplevel $w
wm title $w "Horizontal Scale Demonstration"
wm iconname $w "hscale"
positionWindow $w
label $w.msg -font $font -wraplength 3.5i -justify left -text "An arrow and a horizontal scale are displayed below. If you click or drag mouse button 1 in the scale, you can change the length of the arrow."
pack $w.msg -side top -padx .5c
## See Code / Dismiss buttons
set btns [addSeeDismiss $w.buttons $w]
pack $btns -side bottom -fill x
frame $w.frame -borderwidth 10
pack $w.frame -side top -fill x
canvas $w.frame.canvas -width 50 -height 50 -bd 0 -highlightthickness 0
$w.frame.canvas create polygon 0 0 1 1 2 2 -fill DeepSkyBlue3 -tags poly
$w.frame.canvas create line 0 0 1 1 2 2 0 0 -fill black -tags line
scale $w.frame.scale -orient horizontal -length 284 -from 0 -to 250 \
-command "setWidth $w.frame.canvas" -tickinterval 50
pack $w.frame.canvas -side top -expand yes -anchor s -fill x -padx 15
pack $w.frame.scale -side bottom -expand yes -anchor n
$w.frame.scale set 75
proc setWidth {w width} {
incr width 21
set x2 [expr {$width - 30}]
if {$x2 < 21} {
set x2 21
}
$w coords poly 20 15 20 35 $x2 35 $x2 45 $width 25 $x2 5 $x2 15 20 15
$w coords line 20 15 20 35 $x2 35 $x2 45 $width 25 $x2 5 $x2 15 20 15
}