Added initial tools support, minor refactor to sidebar actions

lib/tools/place_entity.rb

@@ -0,0 +1,49 @@
+class IMICRTS
+  class PlaceEntity < Tool
+    attr_reader :entity, :construction_worker
+
+    def setup
+      @entity = @options[:entity]
+      @construction_worker = @options[:construction_worker]
+
+      @preview = Entity.new(name: @entity, player: @player, id: 0, position: CyberarmEngine::Vector.new, angle: 0, director: @director)
+    end
+
+    def draw
+      # TODO: draw affected tiles
+      @preview.draw
+    end
+
+    def update
+      # TODO: ensure that construction worker is alive
+      cancel_tool if @construction_worker.die?
+      @preview.position = @player.camera.transform(@game.window.mouse)
+      @preview.position.z = ZOrder::OVERLAY
+
+      @preview.color.alpha = 150
+    end
+
+    def button_down(id)
+      case id
+      when Gosu::MsRight
+        cancel_tool
+      end
+    end
+
+    def button_up(id)
+      case id
+      when Gosu::MsLeft
+        return if @game.sidebar.hit?(@game.window.mouse_x, @game.window.mouse_y)
+
+        transform = @player.camera.transform(@game.window.mouse)
+
+        @director.spawn_entity(
+          player_id: @player.id, name: @entity,
+          position: CyberarmEngine::Vector.new(transform.x, transform.y, ZOrder::BUILDING)
+        )
+
+        cancel_tool
+      end
+    end
+  end
+end