Added support for UI to have background_images, fixed TextBlock text overdrawing

lib/cyberarm_engine/background_image.rb

@@ -0,0 +1,55 @@
+module CyberarmEngine
+  class BackgroundImage
+    include CyberarmEngine::Common
+    attr_accessor :x, :y, :z, :width, :height, :mode, :color
+    attr_reader :image
+
+    def initialize(image_path: nil, x: 0, y: 0, z: 0, width: 0, height: 0, mode: :fill, color: Gosu::Color::WHITE)
+      @image = get_image(image_path) if image_path
+
+      @x = x
+      @y = y
+      @z = z
+      @width = width
+      @height = height
+
+      @mode = mode
+
+      @color = color
+    end
+
+    def image=(image_path)
+      @image = image_path ? get_image(image_path) : image_path
+    end
+
+    def width_scale
+      (@width.to_f / @image.width).abs
+    end
+
+    def height_scale
+      (@height.to_f / @image.height).abs
+    end
+
+    def draw
+      return unless @image
+
+      send(:"draw_#{mode}")
+    end
+
+    def draw_stretch
+      @image.draw(@x, @y, @z, width_scale, height_scale, @color)
+    end
+
+    def draw_tiled
+      raise NotImplementedError
+    end
+
+    def draw_fill
+      if @width * width_scale > height * height_scale
+        @image.draw(@x, @y, @z, width_scale, width_scale, @color)
+      else
+        @image.draw(@x, @y, @z, height_scale, height_scale, @color)
+      end
+    end
+  end
+end