Set size of main window
#!/usr/bin/env ruby require 'tk' TkRoot.new {title "Ruby is fun!" } TkLabel.new { font TkFont.new( 'mistral 42' ) text "Ruby is fun, in case you didn't notice!" width 30 height 3 fg 'blue' pack } TkButton.new { text 'Quit' command 'exit' pack } Tk.mainloop