Implemented Zoom

lib/camera.rb

@@ -1,12 +1,17 @@
 class IMICRTS
   class Camera
-    attr_reader :position, :velocity, :drag
+    attr_reader :position, :velocity, :zoom, :drag
     def initialize(scroll_speed: 10, position: CyberarmEngine::Vector.new(0.0, 0.0))
       @scroll_speed = scroll_speed
       @position = position
       @velocity = CyberarmEngine::Vector.new(0.0, 0.0)
 
-      @drag = 0.8
+      @zoom = 1.0
+      @min_zoom = 0.25
+      @max_zoom = 4.0
+
+      @drag = 0.8 # Used to arrest velocity
+      @grab_drag = 0.5 # Used when camera is panned using middle mouse button
     end
 
     def window; $window; end
@@ -14,7 +19,10 @@ class IMICRTS
     def draw(&block)
       if block
         Gosu.translate(@position.x, @position.y) do
-          block.call
+          center_point = center
+          Gosu.scale(@zoom, @zoom, center.x, center.y) do
+            block.call
+          end
         end
       end
     end
@@ -26,8 +34,18 @@ class IMICRTS
       @position += @velocity * @scroll_speed
     end
 
+    def mouse_pick(x, y)
+      mouse = CyberarmEngine::Vector.new(x, y)
+
+      normalized = (mouse / @zoom - @position / @zoom) * @zoom
+      normalized.x = normalized.x.floor
+      normalized.y = normalized.y.floor
+
+      return normalized
+    end
+
     def center
-      CyberarmEngine::Vector.new(window.width / 2, window.height / 2) - @position
+      (CyberarmEngine::Vector.new(window.width / 2, window.height / 2) / @zoom - @position / @zoom) * @zoom
     end
 
     def center_around(vector, factor)
@@ -48,7 +66,7 @@ class IMICRTS
 
       if @drag_start
         @velocity *= 0.0
-        @position = CyberarmEngine::Vector.new(window.mouse_x, window.mouse_y) - @drag_start
+        @position = lerp(@position, CyberarmEngine::Vector.new(window.mouse_x, window.mouse_y) - @drag_start, @grab_drag)
       end
     end
 
@@ -57,9 +75,13 @@ class IMICRTS
       when Gosu::KB_H
         @position.x, @position.y = 0.0, 0.0
         @velocity *= 0.0
+      when Gosu::MS_WHEEL_UP
+        @zoom = (@zoom + 0.25).clamp(@min_zoom, @max_zoom)
+      when Gosu::MS_WHEEL_DOWN
+        @zoom = (@zoom - 0.25).clamp(@min_zoom, @max_zoom)
       when Gosu::MS_MIDDLE
         @position_start = @position.clone
-        @drag_start = CyberarmEngine::Vector.new(window.mouse_x, window.mouse_y) - @position
+        @drag_start = CyberarmEngine::Vector.new(window.mouse_x, window.mouse_y)
       end
     end
 

lib/states/closing.rb

@@ -18,11 +18,11 @@ class IMICRTS
       factor = (1.0 - ((Gosu.milliseconds - @started_at) / @close_time.to_f)).clamp(0.0, 1.0)
       @color.alpha = 255 * (factor - 0.1)
 
-      window.close if Gosu.milliseconds - @started_at >= @close_time
+      window.close! if Gosu.milliseconds - @started_at >= @close_time
     end
 
     def button_up(id)
-      window.close if id == Gosu::KB_ESCAPE
+      window.close!
     end
   end
 end

lib/states/game.rb

@@ -6,19 +6,18 @@ class IMICRTS
       @mouse_pos = CyberarmEngine::Text.new("X: 0\nY: 0", x: 500, y: 10, z: Float::INFINITY)
 
       @sidebar = stack(height: 1.0) do
-        background [0xff555555, Gosu::Color::GRAY]
+        background [0x55555555, 0x55666666]
 
-        label "SIDEBAR", text_size: 78
-        label ""
+        label "SIDEBAR", text_size: 78, margin_bottom: 20
 
-        button("Harvest", width: 1.0) do
+        @h = button("Harvester", width: 1.0) do
           @units << Entity.new(
             images: Gosu::Image.new("assets/vehicles/harvester/images/harvester.png", retro: true),
             position: CyberarmEngine::Vector.new(rand(window.width), rand(window.height), ZOrder::GROUND_VEHICLE),
             angle: rand(360)
           )
         end
-        button("Construction Worker", width: 1.0) do
+        @c = button("Construction Worker", width: 1.0) do
           @units << Entity.new(
             images: Gosu::Image.new("assets/vehicles/construction_worker/images/construction_worker.png", retro: true),
             position: CyberarmEngine::Vector.new(rand(window.width), rand(window.height), ZOrder::GROUND_VEHICLE),
@@ -27,11 +26,13 @@ class IMICRTS
         end
 
 
-        button("Leave", width: 1.0) do
+        button("Leave", width: 1.0, margin_top: 20) do
           finalize
           push_state(MainMenu)
         end
       end
+
+      100.times { |i| [@c, @h].sample.instance_variable_get("@block").call }
     end
 
     def draw
@@ -43,10 +44,10 @@ class IMICRTS
         @units.each(&:draw)
 
         draw_rect(@anchor.x - 10, @anchor.y - 10, 20, 20, Gosu::Color::RED, Float::INFINITY) if @anchor
-        # draw_rect(@camera.center.x - 10, @camera.center.y - 10, 20, 20, Gosu::Color::BLACK, Float::INFINITY)
+        draw_rect(@camera.center.x - 10, @camera.center.y - 10, 20, 20, Gosu::Color::BLACK, Float::INFINITY)
 
-        # mouse_center = CyberarmEngine::Vector.new(window.mouse_x, window.mouse_y) - @camera.position
-        # draw_rect(mouse_center.x - 10, mouse_center.y - 10, 20, 20, Gosu::Color::YELLOW, Float::INFINITY)
+        mouse = @camera.mouse_pick(window.mouse_x, window.mouse_y)
+        draw_rect(mouse.x - 10, mouse.y - 10, 20, 20, Gosu::Color::YELLOW, Float::INFINITY)
       end
 
       @mouse_pos.draw
@@ -61,7 +62,8 @@ class IMICRTS
         @camera.center_around(@anchor, 0.9)
       end
 
-      @mouse_pos.text = "X: #{window.mouse_x}\nY: #{window.mouse_y}"
+      mouse = @camera.mouse_pick(window.mouse_x, window.mouse_y)
+      @mouse_pos.text = "Zoom: #{@camera.zoom}\nX: #{window.mouse_x}\nY: #{window.mouse_y}\n\nX: #{mouse.x}\nY: #{mouse.y}"
     end
 
     def button_down(id)
@@ -70,12 +72,12 @@ class IMICRTS
       case id
       when Gosu::MS_LEFT
         unless @sidebar.hit?(window.mouse_x, window.mouse_y)
-          @anchor = CyberarmEngine::Vector.new(window.mouse_x, window.mouse_y) - @camera.position
+          @anchor = @camera.mouse_pick(window.mouse_x, window.mouse_y)
         end
       when Gosu::MS_RIGHT
         @anchor = nil
       end
-      @camera.button_down(id)
+      @camera.button_down(id) unless @sidebar.hit?(window.mouse_x, window.mouse_y)
     end
 
     def button_up(id)

lib/window.rb

@@ -14,6 +14,10 @@ class IMICRTS
       @last_update_time = Gosu.milliseconds
     end
 
+    def close
+      push_state(Closing) unless current_state.is_a?(Closing)
+    end
+
     def delta_time
       Gosu.milliseconds - @last_update_time
     end