Step by Step solution about How to resolve the algorithm Hello world/Graphical step by step in the Ruby programming language

The provided Ruby code demonstrates the usage of various GUI libraries and techniques to display messages in user interfaces. Let's break down each section:

1. Gtk2 Library:

   • This section creates a basic GUI window using the Gtk2 library.
   • It sets the window's title to 'Goodbye, World' and connects an event handler to close the window upon clicking the close button.
   • It displays the window with window.show_all.

2. Tk Library:

   • This section uses the Tk library to create a simple GUI window.
   • It creates a label with the text "CHUNKY BACON!" and packs it into the window.
   • It starts the main event loop with Tk.mainloop.

3. Shoes Library:

   • This section uses the Shoes library to create a GUI window.
   • It includes a single paragraph with the text "CHUNKY BACON!" in a large font.
   • It starts the Shoes application with Shoes.app { ... }.

4. Gosu Library:

   • This section uses the Gosu library to create a simple graphics window.
   • It creates a new window with custom dimensions and initializes a font.
   • In the draw method, it draws the text "Hello world" onto the window.
   • It shows the window with Window.new.show.

5. Green Shoes Library:

   • This section uses the Green Shoes library to create a GUI window.
   • It includes a single paragraph with the text "Hello world."
   • It starts the Green Shoes application with Shoes.app { ... }.

6. Win32OLE Library:

   • This section uses the Win32OLE library to display a message box on Windows systems.
   • It creates a new WScript.Shell object and uses the popup method to display a message box with the text "Hello world."

require 'gtk2'

window = Gtk::Window.new
window.title = 'Goodbye, World'
window.signal_connect(:delete-event) { Gtk.main_quit }
window.show_all

Gtk.main

require 'tk'
root = TkRoot.new("title" => "User Output")
TkLabel.new(root, "text"=>"CHUNKY BACON!").pack("side"=>'top')
Tk.mainloop

#_Note: this code MUST be executed through the Shoes GUI!!

Shoes.app do
  para "CHUNKY BACON!", :size => 72
end

require 'gosu'

class Window < Gosu::Window

  def initialize
    super(150, 50, false)
    @font = Gosu::Font.new(self, "Arial", 32)
  end

  def draw
    @font.draw("Hello world", 0, 10, 1, 1, 1)
  end
  
end

Window.new.show

#_Note: this code must not be executed through a GUI
require 'green_shoes'

Shoes.app do
  para "Hello world"
end

require 'win32ole'
WIN32OLE.new('WScript.Shell').popup("Hello world")