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