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#!/usr/bin/env ruby
require 'tk'
require 'tkextlib/blt'
file = File.join(File.dirname(File.expand_path(__FILE__)),
'images', 'sample.gif')
if File.exist?(file)
src = TkPhotoImage.new(:file=>file)
else
fail RuntimeError, 'no image file'
end
width = src.width
height = src.height
TkOption.add('*Label.font', '*helvetica*10*')
TkOption.add('*Label.background', 'white')
l_img0 = TkLabel.new(:image=>src)
l_hdr0 = TkLabel.new(:text=>"#{width} x #{height}")
l_ftr0 = TkLabel.new(:text=>'100%')
Tk.root.background('white')
(2..10).each{|i|
iw = width/i
ih = height/i
r = '%6g'%(100.0/i)
dst = TkPhotoImage.new(:width=>iw, :height=>ih)
Tk::BLT::Winop.image_resample(src, dst, :sinc)
l_hdr = TkLabel.new(:text=>"#{iw} x #{ih}")
l_ftr = TkLabel.new(:text=>"#{r}%")
l_img = TkLabel.new(:image=>dst)
Tk::BLT::Table.add(Tk.root,
[0,i], l_hdr,
[1,i], l_img,
[2,i], l_ftr)
Tk.update
}
Tk.mainloop
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