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require "tkcanvas"
if defined?($hscale_demo) && $hscale_demo
$hscale_demo.destroy
$hscale_demo = nil
end
$hscale_demo = TkToplevel.new {|w|
title("Horizontal Scale Demonstration")
iconname("hscale")
}
positionWindow($hscale_demo)
base_frame = TkFrame.new($hscale_demo).pack(:fill=>:both, :expand=>true)
msg = TkLabel.new(base_frame) {
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."
}
msg.pack('side'=>'top')
TkFrame.new(base_frame) {|frame|
TkButton.new(frame) {
text 'Dismiss'
command proc {
tmppath = $hscale_demo
$hscale_demo = nil
tmppath.destroy
}
}.pack('side'=>'left', 'expand'=>'yes')
TkButton.new(frame) {
text 'Show Code'
command proc { showCode 'hscale' }
}.pack('side'=>'left', 'expand'=>'yes')
}.pack('side'=>'bottom', 'fill'=>'x', 'pady'=>'2m')
def setWidth(w, width)
width = width + 21
x2 = width - 30
if x2 < 21
x2 = 21
end
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
end
TkFrame.new(base_frame) {|frame|
canvas = TkCanvas.new(frame) {|c|
width 50
height 50
bd 0
highlightthickness 0
TkcPolygon.new(c, '0', '0', '1', '1', '2', '2') {
fill 'DeepSkyBlue'
tags 'poly'
}
TkcLine.new(c, '0', '0', '1', '1', '2', '2', '0', '0') {
fill 'black'
tags 'line'
}
}.pack('side'=>'top', 'expand'=>'yes', 'anchor'=>'s', 'fill'=>'x', 'padx'=>'15')
scale = TkScale.new(frame) {
orient 'horizontal'
length 284
from 0
to 250
command proc{|value| setWidth(canvas, value)}
tickinterval 50
}.pack('side'=>'bottom', 'expand'=>'yes', 'anchor'=>'n')
scale.set 75
}.pack('side'=>'top', 'fill'=>'x')
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