create example

example.rb

@@ -0,0 +1,53 @@
+#!/usr/bin/env ruby
+
+require 'sfml/all'
+require 'opengl'
+
+class Example
+  include SFML
+
+  TITLE = "Josh's Ruby SFML/OpenGL Example"
+
+  def initialize
+    @fullscreen = false
+    @window = Window.new
+    create_window
+  end
+
+  def create_window
+    if @fullscreen
+      @window.create(VideoMode.get_desktop_mode, TITLE, Style::Fullscreen)
+    else
+      @window.create([1200, 900], TITLE)
+    end
+
+    glClearColor(1, 0.5, 0, 0)
+  end
+
+  def run
+    while @window.open?
+      @window.each_event do |event|
+        case event.type
+        when Event::Closed
+          @window.close
+        when Event::KeyPressed
+          case event.key.code
+          when Keyboard::Escape
+            @window.close
+          when Keyboard::F
+            @fullscreen = !@fullscreen
+            create_window
+          end
+        when Event::Resized # Resize event : adjust viewport
+          glViewport(0, 0, event.size.width, event.size.height)
+        end
+      end
+
+      glClear(GL_COLOR_BUFFER_BIT)
+
+      @window.display
+    end
+  end
+end
+
+Example.new.run