initial commit

menu/scene.rb

@@ -0,0 +1,67 @@
+class Menu < Scene
+  OPTIONS = {
+    "Start" => -> { $bus.emit(:change_scene, Game.new) },
+    "Settings" => -> { $bus.emit(:change_scene, Settings.new) },
+    "Quit" => -> { $bus.emit(:quit_game) }
+  }.freeze
+
+  def initialize
+    super
+    @font = Gosu::Font.new(32, name: "assets/fonts/tn.ttf")
+    @selected_index = 0
+    @bg_image = Gosu::Image.new("assets/images/menu_bg.png", retro: true)
+    @last_mouse_pos = nil
+  end
+
+  def update
+    pos = $bus.get(:mouse_pos)
+    return unless pos
+
+    if @last_mouse_pos.nil? || ( (pos[0] - @last_mouse_pos[0]).abs > 2 || (pos[1] - @last_mouse_pos[1]).abs > 2 )
+      hovered_option = item_at(pos)
+      @selected_index = hovered_option[0] if hovered_option
+      @last_mouse_pos = pos.dup
+    end
+  end
+
+  def draw
+    @bg_image.draw(0, 0, 1)
+
+    OPTIONS.each_with_index do |(text, _), index|
+      y = 260 + index * 50
+      if index == @selected_index
+        @font.draw_text("[ #{text.ljust(10)} ]", 50, y, 1, 1, 1, Gosu::Color::YELLOW)
+      else
+        @font.draw_text("  #{text.ljust(10)}  ", 50, y, 1, 1, 1, Gosu::Color::WHITE)
+      end
+    end
+  end
+
+  def button_down(id, pos)
+    case id
+    when Gosu::KB_UP
+      @selected_index = (@selected_index - 1) % OPTIONS.size
+    when Gosu::KB_DOWN
+      @selected_index = (@selected_index + 1) % OPTIONS.size
+    when Gosu::KB_RETURN
+      OPTIONS.values[@selected_index].call
+    end
+
+    return unless id == Gosu::MS_LEFT && pos
+
+    selected_option = item_at(pos)
+    selected_option[1].call if selected_option
+  end
+
+  private
+
+  def item_at(pos)
+    OPTIONS.each_with_index do |(_, action), index|
+      y = 260 + index * 50
+      if pos[1].between?(y, y + 32) && pos[0].between?(50, 50 + @font.text_width(" " * 14))
+        return [index, action]
+      end
+    end
+    nil
+  end
+end