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# vscale.rb
#
# This demonstration script shows an example with a vertical scale.
require "tkcanvas"
if defined?($vscale_demo) && $vscale_demo
$vscale_demo.destroy
$vscale_demo = nil
end
$vscale_demo = TkToplevel.new {|w|
title("Vertical Scale Demonstration")
iconname("vscale")
}
positionWindow($vscale_demo)
msg = TkLabel.new($vscale_demo) {
font $font
wraplength '3.5i'
justify 'left'
text "An arrow and a vertical scale are displayed below. If you click or drag mouse button 1 in the scale, you can change the size of the arrow."
}
msg.pack('side'=>'top', 'padx'=>'.5c')
TkFrame.new($vscale_demo) {|frame|
TkButton.new(frame) {
text 'Dismiss'
command proc {
tmppath = $vscale_demo
$vscale_demo = nil
tmppath.destroy
}
}.pack('side'=>'left', 'expand'=>'yes')
TkButton.new(frame) {
text 'Show Code'
command proc { showCode 'vscale' }
}.pack('side'=>'left', 'expand'=>'yes')
}.pack('side'=>'bottom', 'fill'=>'x', 'pady'=>'2m')
TkFrame.new($vscale_demo) {|frame|
borderwidth 10
canvas = TkCanvas.new(frame) {|c|
width 50
height 50
bd 0
highlightthickness 0
TkcPolygon.new(c, 0, 0, 1, 1, 2, 2) {
fill 'SeaGreen3'
tags 'poly'
}
TkcLine.new(c, 0, 0, 1, 1, 2, 2, 0, 0) {
fill 'black'
tags 'line'
}
}.pack('side'=>'left', 'anchor'=>'nw', 'fill'=>'y')
scale = TkScale.new(frame) {
orient 'vertical'
length 284
from 0
to 250
command proc{|value| setHeight(canvas, value)}
tickinterval 50
}.pack('side'=>'left', 'anchor'=>'ne')
scale.set 75
}.pack
def setHeight(w, height)
height = height + 21
y2 = height - 30
if y2 < 21
y2 = 21
end
w.coords 'poly',15,20,35,20,35,y2,45,y2,25,height,5,y2,15,y2,15,20
w.coords 'line',15,20,35,20,35,y2,45,y2,25,height,5,y2,15,y2,15,20
end
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