mingw/lib/tk8.5/demos/vscale.tcl

   1 # vscale.tcl --
   2 #
   3 # This demonstration script shows an example with a vertical scale.
   4
   5 if {![info exists widgetDemo]} {
   6     error "This script should be run from the \"widget\" demo."
   7 }
   8
   9 package require Tk
  10
  11 set w .vscale
  12 catch {destroy $w}
  13 toplevel $w
  14 wm title $w "Vertical Scale Demonstration"
  15 wm iconname $w "vscale"
  16 positionWindow $w
  17
  18 label $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."
  19 pack $w.msg -side top -padx .5c
  20
  21 ## See Code / Dismiss buttons
  22 set btns [addSeeDismiss $w.buttons $w]
  23 pack $btns -side bottom -fill x
  24
  25 frame $w.frame -borderwidth 10
  26 pack $w.frame
  27
  28 scale $w.frame.scale -orient vertical -length 284 -from 0 -to 250 \
  29         -command "setHeight $w.frame.canvas" -tickinterval 50
  30 canvas $w.frame.canvas -width 50 -height 50 -bd 0 -highlightthickness 0
  31 $w.frame.canvas create polygon 0 0 1 1 2 2 -fill SeaGreen3 -tags poly
  32 $w.frame.canvas create line 0 0 1 1 2 2 0 0 -fill black -tags line
  33 frame $w.frame.right -borderwidth 15
  34 pack $w.frame.scale -side left -anchor ne
  35 pack $w.frame.canvas -side left -anchor nw -fill y
  36 $w.frame.scale set 75
  37
  38 proc setHeight {w height} {
  39     incr height 21
  40     set y2 [expr {$height - 30}]
  41     if {$y2 < 21} {
  42         set y2 21
  43     }
  44     $w coords poly 15 20 35 20 35 $y2 45 $y2 25 $height 5 $y2 15 $y2 15 20
  45     $w coords line 15 20 35 20 35 $y2 45 $y2 25 $height 5 $y2 15 $y2 15 20
  46 }