From: Armin Roehrl <armin@...>
Date: 2001-11-06T09:13:35+09:00
Subject: [ruby-talk:24436] How to dump a canvas into a png-file?

Hi,

It is possible to dump a canvas in a postscript file.

Without using some external conversion prg from ps to png is there
a trick to convert the canvas into a png/jpeg/gif/whatever image?
I had a quick look in tkcanvas.rb.. but no luck.

Thanks a lot,
I put the ps-example below.. taken from the Japanese Ruby-Tk FAQ.

Cheers,
Armin.
--
#!/usr/local/bin/ruby 
require "tk" 
min_x = 0
min_y = 0
c = TkCanvas.new
i = TkcLine.new(c, 0, 0, 50, 50)
c.pack 
ps = c.postscript('x' => min_x,
                         'y' => min_y,
                         'width' => c.cget('width'),
                         'height' => c.cget('height')) 
f = open('file.ps', 'w')
f.print ps
f.close 

Tk.mainloop




-----------------------------------------------
Armin Roehrl, http://www.approximity.com
"The best way to predict the future is to invent it."
                                          --Alan Kay