1# vscale.tcl --
2#
3# This demonstration script shows an example with a vertical scale.
4#
5# SCCS: @(#) vscale.tcl 1.3 96/02/16 10:49:51
6
7set w .vscale
8catch {destroy $w}
9toplevel $w
10wm title $w "Vertical Scale Demonstration"
11wm iconname $w "vscale"
12positionWindow $w
13
14label $w.msg -font $font -wraplength 3.5i -justify left -text "An arrow and a vertical scale are displayed below.  If you click or drag mouse button 1 in the scale, you can change the size of the arrow."
15pack $w.msg -side top -padx .5c
16
17frame $w.buttons
18pack $w.buttons -side bottom -fill x -pady 2m
19button $w.buttons.dismiss -text Dismiss -command "destroy $w"
20button $w.buttons.code -text "See Code" -command "showCode $w"
21pack $w.buttons.dismiss $w.buttons.code -side left -expand 1
22
23frame $w.frame -borderwidth 10
24pack $w.frame
25
26scale $w.frame.scale -orient vertical -length 284 -from 0 -to 250 \
27	-command "setHeight $w.frame.canvas" -tickinterval 50
28canvas $w.frame.canvas -width 50 -height 50 -bd 0 -highlightthickness 0
29$w.frame.canvas create polygon 0 0 1 1 2 2 -fill SeaGreen3 -tags poly
30$w.frame.canvas create line 0 0 1 1 2 2 0 0 -fill black -tags line
31frame $w.frame.right -borderwidth 15
32pack $w.frame.scale -side left -anchor ne
33pack $w.frame.canvas -side left -anchor nw -fill y
34$w.frame.scale set 75
35
36proc setHeight {w height} {
37    incr height 21
38    set y2 [expr $height - 30]
39    if {$y2 < 21} {
40	set y2 21
41    }
42    $w coords poly 15 20 35 20 35 $y2 45 $y2 25 $height 5 $y2 15 $y2 15 20
43    $w coords line 15 20 35 20 35 $y2 45 $y2 25 $height 5 $y2 15 $y2 15 20
44}
45