From: "Marvin Gülker" <sutniuq@...>
Date: 2009-11-15T03:43:43+09:00
Subject: Re: How to do a getPixel on Win32 using Ruby?

Jian Lin wrote:
> Jian Lin wrote:
>> Does someone know how to do a getPixel on Win32 using Ruby?  (either to
>> get a pixel's color value on a window or on the whole screen).  thanks.
> 
> ah... and also setPixel() too.

Do you want to draw onto the screen?

If so, I think you should use a GUI toolkit, create a maximized window, 
without a title bar and border, and then draw onto it. For example, in 
wxRuby:
------------------
require "wx"

class MyApp < Wx::App
  include Wx

  def on_init
    @mainwindow = Frame.new(nil, -1, "", DEFAULT_POSITION, DEFAULT_SIZE, 
MAXIMIZE)
    @mainwindow.background_colour = BLACK
    Timer.after(3000) do
      @mainwindow.paint do |dc|
        dc.pen = WHITE_PEN
        dc.draw_line(0, 0, 500, 500)
      end
    end
    Timer.after(5000){@mainwindow.close}
    @mainwindow.show
  end

end

x = MyApp.new
x.main_loop
-------------------

This creates a maximized, black window and after 3 seconds it draws a 
white line from (0|0) to (500|500). After five seconds (from the 
beginning) it closes the window.
Tested with ruby 1.9.1p243 (2009-07-16 revision 24175) [i386-mingw32] on 
Windows Vista.

Marvin
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