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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
- }
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