initial commit

main.rb

@@ -0,0 +1,92 @@
+require 'gosu'
+
+require_relative 'settings/configuration'
+require_relative 'utils/bus'
+require_relative 'utils/utils'
+require_relative 'utils/scene'
+require_relative 'settings/scene'
+require_relative 'menu/scene'
+require_relative 'game/scene'
+
+$bus = EventBus.new
+
+# Main window
+class Window < Gosu::Window
+  def initialize
+    super *SCREEN_SIZE, resizable: true
+    self.caption = "Mist"
+
+    @scene = Menu.new
+
+    $bus.on(:quit_game) { close! }
+
+    $bus.on_retrievable(:mouse_pos) do
+      next mouse_relative(mouse_x, mouse_y)
+    end
+
+    $bus.on(:change_scene) do |new_scene|
+      @scene.close
+      @scene = new_scene
+    end
+  end
+
+  def button_down(id)
+    @scene.button_down(id, mouse_relative(mouse_x, mouse_y))
+  end
+
+  def update
+    @scene.update
+  end
+
+  def compute_transform
+    scale_x = width.to_f / SCREEN_SIZE[0]
+    scale_y = height.to_f / SCREEN_SIZE[1]
+
+    scale = [scale_x, scale_y].min
+
+    if scale_x < scale_y
+      offset_x = 0
+      offset_y = (height - SCREEN_SIZE[1] * scale) / 2
+    else
+      offset_x = (width - SCREEN_SIZE[0] * scale) / 2
+      offset_y = 0
+    end
+
+    [scale, offset_x, offset_y]
+  end
+
+  def mouse_relative(sx, sy)
+    scale, offset_x, offset_y = compute_transform
+
+    virtual_x = (sx - offset_x) / scale
+    virtual_y = (sy - offset_y) / scale
+
+    return nil if virtual_x < 0 || virtual_x > SCREEN_SIZE[0] ||
+                  virtual_y < 0 || virtual_y > SCREEN_SIZE[1]
+
+    return [virtual_x, virtual_y]
+  end
+
+  def draw
+    scale, offset_x, offset_y = compute_transform
+    
+    Gosu.translate(offset_x, offset_y) do
+      Gosu.scale(scale) do
+        @scene.draw
+      end
+    end
+
+    padding_color = Gosu::Color::BLACK
+    if offset_y > 0
+      # Letterbox: top and bottom
+      Gosu.draw_rect(0, 0, width, offset_y, padding_color, Float::INFINITY)
+      Gosu.draw_rect(0, height - offset_y, width, offset_y, padding_color, Float::INFINITY)
+    else
+      # Pillarbox: left and right
+      Gosu.draw_rect(0, 0, offset_x, height, padding_color, Float::INFINITY)
+      Gosu.draw_rect(width - offset_x, 0, offset_x, height, padding_color, Float::INFINITY)
+    end
+  end
+end
+
+Window.new.show