Bumped version

lib/cyberarm_engine.rb

@@ -9,6 +9,8 @@ require_relative "cyberarm_engine/engine"
 
 require_relative "cyberarm_engine/lib/bounding_box"
 require_relative "cyberarm_engine/lib/vector"
+require_relative "cyberarm_engine/lib/ray"
+require_relative "cyberarm_engine/lib/shader" if defined?(OpenGL)
 require_relative "cyberarm_engine/background"
 
 require_relative "cyberarm_engine/objects/text"
@@ -19,16 +21,17 @@ require_relative "cyberarm_engine/ui/event"
 require_relative "cyberarm_engine/ui/style"
 require_relative "cyberarm_engine/ui/border_canvas"
 require_relative "cyberarm_engine/ui/element"
-require_relative "cyberarm_engine/ui/label"
-require_relative "cyberarm_engine/ui/button"
-require_relative "cyberarm_engine/ui/toggle_button"
-require_relative "cyberarm_engine/ui/edit_line"
-require_relative "cyberarm_engine/ui/image"
-require_relative "cyberarm_engine/ui/container"
+require_relative "cyberarm_engine/ui/elements/label"
+require_relative "cyberarm_engine/ui/elements/button"
+require_relative "cyberarm_engine/ui/elements/toggle_button"
+require_relative "cyberarm_engine/ui/elements/edit_line"
+require_relative "cyberarm_engine/ui/elements/image"
+require_relative "cyberarm_engine/ui/elements/container"
+require_relative "cyberarm_engine/ui/elements/flow"
+require_relative "cyberarm_engine/ui/elements/stack"
+require_relative "cyberarm_engine/ui/elements/check_box"
+require_relative "cyberarm_engine/ui/elements/progress"
 
-require_relative "cyberarm_engine/ui/flow"
-require_relative "cyberarm_engine/ui/stack"
-require_relative "cyberarm_engine/ui/check_box"
 require_relative "cyberarm_engine/ui/dsl"
 
 require_relative "cyberarm_engine/game_state"

lib/cyberarm_engine/background.rb

@@ -158,9 +158,20 @@ module CyberarmEngine
         @top_right    = background[:top_right]
         @bottom_left  = background[:bottom_left]
         @bottom_right = background[:bottom_right]
+      elsif background.is_a?(Range)
+        set([background.begin, background.begin, background.end, background.end])
       else
         raise ArgumentError, "background '#{background}' of type '#{background.class}' was not able to be processed"
       end
     end
   end
-end
+end
+
+# Add <=> method to support Range based gradients
+module Gosu
+ class Color
+   def <=>(other)
+     self
+   end
+ end
+end

lib/cyberarm_engine/engine.rb

@@ -62,7 +62,7 @@ module CyberarmEngine
         @states << klass
       else
         @states << klass.new(options) if child_of?(klass, GameState)
-        @states << klass.new if child_of?(klass, Container)
+        @states << klass.new if child_of?(klass, Element::Container)
       end
     end
 

lib/cyberarm_engine/lib/ray.rb

@@ -0,0 +1,55 @@
+module CyberarmEngine
+  class Ray
+    def initialize(origin, direction)
+      raise "Origin must be a Vector!" unless origin.is_a?(Vector)
+      raise "Direction must be a Vector!" unless direction.is_a?(Vector)
+
+      @origin  = origin
+      @direction = direction
+
+      @inverse_direction = @direction.inverse
+    end
+
+    def intersect?(intersectable)
+      if intersectable.is_a?(BoundingBox)
+        intersect_bounding_box?(intersectable)
+      else
+        raise NotImplementedError, "Ray intersection test for #{intersectable.class} not implemented."
+      end
+    end
+
+    # Based on: https://tavianator.com/fast-branchless-raybounding-box-intersections/
+    def intersect_bounding_box?(box)
+      tmin = -Float::INFINITY
+      tmax = Float::INFINITY
+
+      tx1 = (box.min.x - @origin.x) * @inverse_direction.x
+      tx2 = (box.max.x - @origin.x) * @inverse_direction.x
+
+      tmin = max(tmin, min(tx1, tx2))
+      tmax = min(tmax, max(tx1, tx2))
+
+      ty1 = (box.min.y - @origin.y) * @inverse_direction.y
+      ty2 = (box.max.y - @origin.y) * @inverse_direction.y
+
+      tmin = max(tmin, min(ty1, ty2))
+      tmax = min(tmax, max(ty1, ty2))
+
+      tz1 = (box.min.z - @origin.z) * @inverse_direction.z
+      tz2 = (box.max.z - @origin.z) * @inverse_direction.z
+
+      tmin = max(tmin, min(tz1, tz2))
+      tmax = min(tmax, max(tz1, tz2))
+
+      return tmax >= max(tmin, 0.0);
+    end
+
+    def min(x, y)
+      ((x) < (y) ? (x) : (y))
+    end
+
+    def max(x, y)
+      ((x) > (y) ? (x) : (y))
+    end
+  end
+end

lib/cyberarm_engine/lib/shader.rb

@@ -0,0 +1,197 @@
+module CyberarmEngine
+  # Ref: https://github.com/vaiorabbit/ruby-opengl/blob/master/sample/OrangeBook/brick.rb
+  class Shader
+    include OpenGL
+
+    def self.add(name, instance)
+      @shaders ||= {}
+      @shaders[name] = instance
+    end
+
+    def self.use(name, &block)
+      shader = @shaders.dig(name)
+      if shader
+        shader.use(&block)
+      else
+        raise ArgumentError, "Shader '#{name}' not found!"
+      end
+    end
+
+    def self.active_shader
+      @active_shader
+    end
+
+    def self.active_shader=(instance)
+      @active_shader = instance
+    end
+
+    def self.stop
+      shader = Shader.active_shader
+
+      if shader
+        shader.stop
+      else
+        raise ArgumentError, "No active shader to stop!"
+      end
+    end
+
+    def self.attribute_location(variable)
+      raise RuntimeError, "No active shader!" unless Shader.active_shader
+      Shader.active_shader.attribute_location(variable)
+    end
+
+    def self.set_uniform(variable, value)
+      raise RuntimeError, "No active shader!" unless Shader.active_shader
+      Shader.active_shader.set_uniform(variable, value)
+    end
+
+    attr_reader :name, :program
+    def initialize(name:, vertex: "shaders/default.vert", fragment:)
+      @name = name
+      @vertex_file   = vertex
+      @fragment_file = fragment
+      @compiled = false
+
+      @program = nil
+
+      @error_buffer_size = 1024
+      @variable_missing = {}
+
+      raise ArgumentError, "Shader files not found: #{@vertex_file} or #{@fragment_file}" unless shader_files_exist?
+
+      create_shaders
+      compile_shaders
+
+      # Only add shader if it successfully compiles
+      if @compiled
+        Shader.add(@name, self)
+      else
+        puts "FAILED to compile shader: #{@name}", ""
+      end
+    end
+
+    def shader_files_exist?
+      File.exist?(@vertex_file) && File.exist?(@fragment_file)
+    end
+
+    def create_shaders
+      @vertex   = glCreateShader(GL_VERTEX_SHADER)
+      @fragment = glCreateShader(GL_FRAGMENT_SHADER)
+
+      source = [File.read(@vertex_file)].pack('p')
+      size   = [File.size(@vertex_file)].pack('I')
+      glShaderSource(@vertex, 1, source, size)
+
+      source = [File.read(@fragment_file)].pack('p')
+      size   = [File.size(@fragment_file)].pack('I')
+      glShaderSource(@fragment, 1, source, size)
+    end
+
+    def compile_shaders
+      return unless shader_files_exist?
+
+      glCompileShader(@vertex)
+      buffer = '    '
+      glGetShaderiv(@vertex, GL_COMPILE_STATUS, buffer)
+      compiled = buffer.unpack('L')[0]
+
+      if compiled == 0
+        log = ' ' * @error_buffer_size
+        glGetShaderInfoLog(@vertex, @error_buffer_size, nil, log)
+        puts "Shader Error: Program \"#{@name}\""
+        puts "  Vectex Shader InfoLog:", "  #{log.strip.split("\n").join("\n  ")}\n\n"
+        puts "  Shader Compiled status: #{compiled}"
+        puts "    NOTE: assignment of uniforms in shaders is illegal!"
+        puts
+        return
+      end
+
+      glCompileShader(@fragment)
+      buffer = '    '
+      glGetShaderiv(@fragment, GL_COMPILE_STATUS, buffer)
+      compiled = buffer.unpack('L')[0]
+
+      if compiled == 0
+        log = ' ' * @error_buffer_size
+        glGetShaderInfoLog(@fragment, @error_buffer_size, nil, log)
+        puts "Shader Error: Program \"#{@name}\""
+        puts "  Fragment Shader InfoLog:", "  #{log.strip.split("\n").join("\n  ")}\n\n"
+        puts "  Shader Compiled status: #{compiled}"
+        puts "    NOTE: assignment of uniforms in shader is illegal!"
+        puts
+        return
+      end
+
+      @program = glCreateProgram
+      glAttachShader(@program, @vertex)
+      glAttachShader(@program, @fragment)
+      glLinkProgram(@program)
+
+      buffer = '    '
+      glGetProgramiv(@program, GL_LINK_STATUS, buffer)
+      linked = buffer.unpack('L')[0]
+
+      if linked == 0
+        log = ' ' * @error_buffer_size
+        glGetProgramInfoLog(@program, @error_buffer_size, nil, log)
+        puts "Shader Error: Program \"#{@name}\""
+        puts "  Program InfoLog:", "  #{log.strip.split("\n").join("\n  ")}\n\n"
+      end
+
+      @compiled = linked == 0 ? false : true
+    end
+
+    # Returns the location of a uniform variable
+    def variable(variable)
+      loc = glGetUniformLocation(@program, variable)
+      if (loc == -1)
+        puts "Shader Error: Program \"#{@name}\" has no such uniform named \"#{variable}\"", "  Is it used in the shader? GLSL may have optimized it out.", "  Is it miss spelled?" unless @variable_missing[variable]
+        @variable_missing[variable] = true
+      end
+      return loc
+    end
+
+    def use(&block)
+      return unless compiled?
+      raise "Another shader is already in use! #{Shader.active_shader.name.inspect}" if Shader.active_shader
+      Shader.active_shader=self
+
+      glUseProgram(@program)
+
+      if block
+        block.call(self)
+        stop
+      end
+    end
+
+    def stop
+      Shader.active_shader = nil if Shader.active_shader == self
+      glUseProgram(0)
+    end
+
+    def compiled?
+      @compiled
+    end
+
+    def attribute_location(variable)
+      glGetUniformLocation(@program, variable)
+    end
+
+    def set_uniform(variable, value, location = nil)
+      attr_loc = location ? location : attribute_location(variable)
+
+      case value.class.to_s.downcase.to_sym
+      when :integer
+        glUniform1i(attr_loc, value)
+      when :float
+        glUniform1f(attr_loc, value)
+      when :string
+      when :array
+      else
+        raise NotImplementedError, "Shader support for #{value.class.inspect} not implemented."
+      end
+
+      Window.handle_gl_error
+    end
+  end
+end

lib/cyberarm_engine/objects/text.rb

@@ -2,8 +2,8 @@ module CyberarmEngine
   class Text
     CACHE = {}
 
-    attr_accessor :x, :y, :z, :size, :factor_x, :factor_y, :color, :shadow, :shadow_size, :options
-    attr_reader :text, :textobject
+    attr_accessor :x, :y, :z, :size, :options
+    attr_reader :text, :textobject, :factor_x, :factor_y, :color, :shadow, :shadow_size, :shadow_alpha, :shadow_color
 
     def initialize(text, options={})
       @text = text.to_s || ""
@@ -22,6 +22,8 @@ module CyberarmEngine
       @shadow   = true if options[:shadow] == nil
       @shadow_size = options[:shadow_size] ? options[:shadow_size] : 1
       @shadow_alpha= options[:shadow_alpha] ? options[:shadow_alpha] : 30
+      @shadow_alpha= options[:shadow_alpha] ? options[:shadow_alpha] : 30
+      @shadow_color= options[:shadow_color]
       @textobject = check_cache(@size, @font)
 
       if @alignment
@@ -67,6 +69,35 @@ module CyberarmEngine
       @text = string
     end
 
+    def factor_x=(n)
+      @rendered_shadow = nil
+      @factor_x = n
+    end
+    def factor_y=(n)
+      @rendered_shadow = nil
+      @factor_y = n
+    end
+    def color=(color)
+      @rendered_shadow = nil
+      @color = color
+    end
+    def shadow=(boolean)
+      @rendered_shadow = nil
+      @shadow = boolean
+    end
+    def shadow_size=(n)
+      @rendered_shadow = nil
+      @shadow_size = n
+    end
+    def shadow_alpha=(n)
+      @rendered_shadow = nil
+      @shadow_alpha = n
+    end
+    def shadow_color=(n)
+      @rendered_shadow = nil
+      @shadow_color = n
+    end
+
     def width
       textobject.text_width(@text)
     end
@@ -77,9 +108,8 @@ module CyberarmEngine
 
     def draw
       if @shadow && !ARGV.join.include?("--no-shadow")
-        @shadow_alpha = 30 if @color.alpha > 30
-        @shadow_alpha = @color.alpha if @color.alpha <= 30
-        shadow_color = Gosu::Color.rgba(@color.red, @color.green, @color.blue, @shadow_alpha)
+        shadow_alpha = @color.alpha <= 30 ? @color.alpha : @shadow_alpha
+        shadow_color = @shadow_color ? @shadow_color : Gosu::Color.rgba(@color.red, @color.green, @color.blue, shadow_alpha)
 
         _x = @shadow_size
         _y = @shadow_size

lib/cyberarm_engine/ui/border_canvas.rb

@@ -66,31 +66,31 @@ module CyberarmEngine
       @top.z = @element.z
 
       @top.width  = @element.width
-      @top.height = @element.border_thickness_top
+      @top.height = @element.style.border_thickness_top
 
       # RIGHT
       @right.x = @element.x + @element.width
-      @right.y = @element.y + @element.border_thickness_top
+      @right.y = @element.y + @element.style.border_thickness_top
       @right.z = @element.z
 
-      @right.width  = -@element.border_thickness_right
-      @right.height = @element.height - @element.border_thickness_top
+      @right.width  = -@element.style.border_thickness_right
+      @right.height = @element.height - @element.style.border_thickness_top
 
       # BOTTOM
       @bottom.x = @element.x
       @bottom.y = @element.y + @element.height
       @bottom.z = @element.z
 
-      @bottom.width  = @element.width - @element.border_thickness_right
-      @bottom.height = -@element.border_thickness_bottom
+      @bottom.width  = @element.width - @element.style.border_thickness_right
+      @bottom.height = -@element.style.border_thickness_bottom
 
       # LEFT
       @left.x = @element.x
       @left.y = @element.y
       @left.z = @element.z
 
-      @left.width  = @element.border_thickness_left
-      @left.height = @element.height - @element.border_thickness_bottom
+      @left.width  = @element.style.border_thickness_left
+      @left.height = @element.height - @element.style.border_thickness_bottom
 
       @top.update
       @right.update

lib/cyberarm_engine/ui/button.rb

@@ -1,53 +0,0 @@
-module CyberarmEngine
-  class Button < Label
-    def initialize(text, options = {}, block = nil)
-      super(text, options, block)
-
-      @background_canvas.background = default(:background)
-    end
-
-    def render
-      draw_text
-    end
-
-    def draw_text
-      @text.draw
-    end
-
-    def enter(sender)
-      @focus = false unless window.button_down?(Gosu::MsLeft)
-
-      if @focus
-        @background_canvas.background = default(:active, :background)
-        @text.color = default(:active, :color)
-      else
-        @background_canvas.background = default(:hover, :background)
-        @text.color = default(:hover, :color)
-      end
-    end
-
-    def left_mouse_button(sender, x, y)
-      @focus = true
-      @background_canvas.background = default(:active, :background)
-      window.current_state.focus = self
-      @text.color = default(:active, :color)
-    end
-
-    def released_left_mouse_button(sender,x, y)
-      enter(sender)
-    end
-
-    def clicked_left_mouse_button(sender, x, y)
-      @block.call(self) if @block
-    end
-
-    def leave(sender)
-      @background_canvas.background = default(:background)
-      @text.color = default(:color)
-    end
-
-    def blur(sender)
-      @focus = false
-    end
-  end
-end

lib/cyberarm_engine/ui/check_box.rb

@@ -1,52 +0,0 @@
-module CyberarmEngine
-  class CheckBox < Flow
-    def initialize(text, options, block = nil)
-      super({}, block = nil)
-      options[:toggled] = options[:checked]
-
-      @toggle_button = ToggleButton.new(options)
-      @label         = Label.new(text, options)
-
-      define_label_singletons
-
-      add(@toggle_button)
-      add(@label)
-
-      @width  = @toggle_button.width + @label.width
-      @height = @toggle_button.height + @label.height
-    end
-
-    def text=(text)
-      @label.text = text
-      recalculate
-    end
-
-    def define_label_singletons
-      @label.define_singleton_method(:_toggle_button) do |button|
-        @_toggle_button = button
-      end
-
-      @label._toggle_button(@toggle_button)
-
-      @label.define_singleton_method(:holding_left_mouse_button) do |sender, x, y|
-        @_toggle_button.left_mouse_button(sender, x, y)
-      end
-
-      @label.define_singleton_method(:released_left_mouse_button) do |sender, x, y|
-        @_toggle_button.released_left_mouse_button(sender, x, y)
-      end
-
-      @label.define_singleton_method(:clicked_left_mouse_button) do |sender, x, y|
-        @_toggle_button.clicked_left_mouse_button(sender, x, y)
-      end
-
-      @label.define_singleton_method(:enter) do |sender|
-        @_toggle_button.enter(sender)
-      end
-
-      @label.define_singleton_method(:leave) do |sender|
-        @_toggle_button.leave(sender)
-      end
-    end
-  end
-end

lib/cyberarm_engine/ui/container.rb

@@ -1,154 +0,0 @@
-module CyberarmEngine
-  class Container < Element
-    include Common
-
-    attr_accessor :stroke_color, :fill_color
-    attr_reader :children
-    attr_reader :scroll_x, :scroll_y
-
-    def initialize(options = {}, block = nil)
-      super
-
-      @scroll_x, @scroll_y = 0, 0
-      @scroll_speed = 10
-
-      @text_color = options[:color]
-
-      @children = []
-
-      @theme = {}
-    end
-
-    def build
-      @theme.merge(@parent.theme) if @parent
-      @block.call(self) if @block
-
-      recalculate
-    end
-
-    def add(element)
-      @children << element
-
-      recalculate
-    end
-
-    def render
-        @children.each(&:draw)
-    end
-
-    def update
-      @children.each(&:update)
-    end
-
-    def theme
-      @theme
-    end
-
-    def color(color)
-      @theme[:color] = color
-    end
-
-    def hit_element?(x, y)
-      @children.reverse_each do |child|
-        case child
-        when Container
-          if element = child.hit_element?(x, y)
-            return element
-          end
-        else
-          return child if child.hit?(x, y)
-        end
-      end
-
-      self if hit?(x, y)
-    end
-
-    def recalculate
-      @current_position = Vector.new(@margin_left, @margin_top)
-
-      layout
-
-      @width  = @max_width  ? @max_width  : (@children.map {|c| c.x + c.width  + c.margin_right }.max || 0).round
-      @height = @max_height ? @max_height : (@children.map {|c| c.y + c.height + c.margin_bottom}.max || 0).round
-
-      # Move child to parent after positioning
-      @children.each do |child|
-        child.x += @x
-        child.y += @y
-
-        # Fix child being displaced
-        child.recalculate
-      end
-
-      update_background
-    end
-
-    def layout
-      raise "Not overridden"
-    end
-
-    def max_width
-      @max_width ? @max_width : window.width - (@parent ? @parent.margin_right + @margin_right : @margin_right)
-    end
-
-    def fits_on_line?(element) # Flow
-      @current_position.x + element.outer_width <= max_width &&
-      @current_position.x + element.outer_width <= window.width
-    end
-
-    def position_on_current_line(element) # Flow
-      element.x = element.margin_left + @current_position.x
-      element.y = element.margin_top  + @current_position.y
-
-      element.recalculate
-
-      @current_position.x += element.outer_width
-      @current_position.x = @margin_left if @current_position.x >= max_width
-    end
-
-    def tallest_neighbor(querier, y_position) # Flow
-      response = querier
-      @children.each do |child|
-        response = child if child.outer_height > response.outer_height
-        break if child == querier
-      end
-
-      return response
-    end
-
-    def position_on_next_line(child) # Flow
-      @current_position.x = @margin_left
-      @current_position.y += tallest_neighbor(child, @current_position.y).outer_height
-
-      child.x = child.margin_left + @current_position.x
-      child.y = child.margin_top  + @current_position.y
-
-      child.recalculate
-
-      @current_position.x += child.outer_width
-    end
-
-    def move_to_next_line(element) # Stack
-      element.x = element.margin_left + @current_position.x
-      element.y = element.margin_top  + @current_position.y
-
-      element.recalculate
-
-      @current_position.y += element.outer_height
-    end
-
-    # def mouse_wheel_up(sender, x, y)
-    #   @children.each {|c| c.y -= @scroll_speed}
-    #   @children.each {|c| c.recalculate}
-    # end
-
-    # def mouse_wheel_down(sender, x, y)
-    #   @children.each {|c| c.y += @scroll_speed}
-    #   @children.each {|c| c.recalculate}
-    # end
-
-    def value
-      @children.map {|c| c.class}.join(", ")
-    end
-  end
-end

lib/cyberarm_engine/ui/dsl.rb

@@ -2,11 +2,11 @@ module CyberarmEngine
   module DSL
     def flow(options = {}, &block)
       options[:parent] = @containers.last
-      options[:theme] = @current_theme
-      _container = Flow.new(options, block)
+      options[:theme] = current_theme
+      _container = Element::Flow.new(options, block)
       @containers << _container
       _container.build
-      options[:parent].add(_container)
+      _container.parent.add(_container)
       @containers.pop
 
       return _container
@@ -14,11 +14,11 @@ module CyberarmEngine
 
     def stack(options = {}, &block)
       options[:parent] = @containers.last
-      options[:theme] = @current_theme
-      _container = Stack.new(options, block)
+      options[:theme] = current_theme
+      _container = Element::Stack.new(options, block)
       @containers << _container
       _container.build
-      options[:parent].add(_container)
+      _container.parent.add(_container)
       @containers.pop
 
       return _container
@@ -26,8 +26,8 @@ module CyberarmEngine
 
     def label(text, options = {}, &block)
       options[:parent] = @containers.last
-      options[:theme] = @current_theme
-      _element = Label.new(text, options, block)
+      options[:theme] = current_theme
+      _element = Element::Label.new(text, options, block)
       @containers.last.add(_element)
 
       return _element
@@ -35,8 +35,8 @@ module CyberarmEngine
 
     def button(text, options = {}, &block)
       options[:parent] = @containers.last
-      options[:theme] = @current_theme
-      _element = Button.new(text, options, block) { if block.is_a?(Proc); block.call; end }
+      options[:theme] = current_theme
+      _element = Element::Button.new(text, options, block) { if block.is_a?(Proc); block.call; end }
       @containers.last.add(_element)
 
       return _element
@@ -44,8 +44,8 @@ module CyberarmEngine
 
     def edit_line(text, options = {}, &block)
       options[:parent] = @containers.last
-      options[:theme] = @current_theme
-      _element = EditLine.new(text, options, block)
+      options[:theme] = current_theme
+      _element = Element::EditLine.new(text, options, block)
       @containers.last.add(_element)
 
       return _element
@@ -53,8 +53,8 @@ module CyberarmEngine
 
     def toggle_button(options = {}, &block)
       options[:parent] = @containers.last
-      options[:theme] = @current_theme
-      _element = ToggleButton.new(options, block)
+      options[:theme] = current_theme
+      _element = Element::ToggleButton.new(options, block)
       @containers.last.add(_element)
 
       return _element
@@ -62,8 +62,8 @@ module CyberarmEngine
 
     def check_box(text, options = {}, &block)
       options[:parent] = @containers.last
-      options[:theme] = @current_theme
-      _element = CheckBox.new(text, options, block)
+      options[:theme] = current_theme
+      _element = Element::CheckBox.new(text, options, block)
       @containers.last.add(_element)
 
       return _element
@@ -71,24 +71,32 @@ module CyberarmEngine
 
     def image(path, options = {}, &block)
       options[:parent] = @containers.last
-      options[:theme] = @current_theme
-      _element = Image.new(path, options, block)
+      options[:theme] = current_theme
+      _element = Element::Image.new(path, options, block)
+      @containers.last.add(_element)
+
+      return _element
+    end
+
+    def progress(options = {}, &block)
+      options[:parent] = @containers.last
+      options[:theme] = current_theme
+      _element = Element::Progress.new(options, block)
       @containers.last.add(_element)
 
       return _element
     end
 
     def background(color = Gosu::Color::NONE)
-      @containers.last.background = color
+      @containers.last.style.background = color
     end
 
-    # Foreground color, e.g. Text
-    def color(color)
-      @containers.last.color(color)
+    def theme(theme)
+      @containers.last.options[:theme] = theme
     end
 
-    def set_theme(theme)
-      @current_theme = theme
+    def current_theme
+      @containers.last.options[:theme]
     end
   end
 end

lib/cyberarm_engine/ui/edit_line.rb

@@ -1,88 +0,0 @@
-module CyberarmEngine
-  class EditLine < Button
-    def initialize(text, options = {}, block = nil)
-      super(text, options, block)
-
-      @type = default(:type)
-
-
-      @caret_width = default(:caret_width)
-      @caret_height= @text.height
-      @caret_color = default(:caret_color)
-      @caret_interval = default(:caret_interval)
-      @caret_last_interval = Gosu.milliseconds
-      @show_caret  = true
-
-      @text_input = Gosu::TextInput.new
-      @text_input.text = text
-
-      return self
-    end
-
-    def render
-      Gosu.clip_to(@text.x, @text.y, @width, @text.height) do
-        draw_text
-        Gosu.draw_rect(caret_position, @text.y, @caret_width, @caret_height, @caret_color, @z + 40) if @focus && @show_caret
-      end
-    end
-
-    def update
-      if @type == :password
-        @text.text = default(:password_character) * @text_input.text.length
-      else
-        @text.text = @text_input.text
-      end
-
-      if Gosu.milliseconds >= @caret_last_interval + @caret_interval
-        @caret_last_interval = Gosu.milliseconds
-
-        @show_caret = !@show_caret
-      end
-    end
-
-    def left_mouse_button(sender, x, y)
-      super
-      window.text_input = @text_input
-    end
-
-    def enter(sender)
-      if @focus
-        @background_canvas.background = default(:active, :background)
-        @text.color = default(:active, :color)
-      else
-        @background_canvas.background = default(:hover, :background)
-        @text.color = default(:hover, :color)
-      end
-    end
-
-    def leave(sender)
-    end
-
-    def blur(sender)
-      @focus = false
-      @background_canvas.background = default(:background)
-      @text.color = default(:color)
-      window.text_input = nil
-    end
-
-    # TODO: Fix caret rendering in wrong position unless caret_pos is at end of text
-    def caret_position
-      if @type == :password
-        @text.x + @text.textobject.text_width(default(:password_character) * @text_input.text[0..@text_input.caret_pos-1].length)
-      else
-        @text.x + @text.textobject.text_width(@text_input.text[0..@text_input.caret_pos-1])
-      end
-    end
-
-    def recalculate
-      super
-
-      @width = default(:width)
-      update_background
-    end
-
-    def value
-      @text_input.text
-    end
-  end
-end

lib/cyberarm_engine/ui/element.rb

@@ -5,99 +5,93 @@ module CyberarmEngine
     include Common
 
     attr_accessor :x, :y, :z, :enabled
-    attr_reader :width, :height, :parent, :options, :event_handler, :background_canvas, :border_canvas
-
-    attr_reader :border_thickness, :border_thickness_left, :border_thickness_right, :border_thickness_top, :border_thickness_bottom
-    attr_reader :border_color, :border_color_left, :border_color_right, :border_color_top, :border_color_bottom
-
-    attr_reader :padding, :padding_left, :padding_right, :padding_top, :padding_bottom
-    attr_reader :margin, :margin_left, :margin_right, :margin_top, :margin_bottom
+    attr_reader :parent, :options, :style, :event_handler, :background_canvas, :border_canvas
 
     def initialize(options = {}, block = nil)
-      @parent = options[:parent] # parent Container (i.e. flow/stack)
+      @parent = options.delete(:parent) # parent Container (i.e. flow/stack)
       options = theme_defaults(options)
       @options = options
       @block = block
 
-      @style             = Style.new(options)
-      @focus             = false
-      @background_canvas = Background.new
-      @border_canvas     = BorderCanvas.new(element: self)
+      @focus   = false
+      @enabled = true
+      @visible = true
 
-      @x = default(:x)
-      @y = default(:y)
-      @z = default(:z)
+      @style = Style.new(options)
+
+      @x = @style.x
+      @y = @style.y
+      @z = @style.z
+
+      @width  = 0
+      @height = 0
 
       @fixed_x = @x if @x != 0
       @fixed_y = @y if @y != 0
 
-      @width  = default(:width)  || $window.width
-      @height = default(:height) || $window.height
+      @style.width  = default(:width)  || nil
+      @style.height = default(:height) || nil
 
-      set_border_thickness(default(:border_thickness))
-
-      set_padding(default(:padding))
-
-      set_margin(default(:margin))
-
-      set_background(default(:background))
-      set_border_color(default(:border_color))
-
-      raise "#{self.class} 'x' must be a number" unless @x.is_a?(Numeric)
-      raise "#{self.class} 'y' must be a number" unless @y.is_a?(Numeric)
-      raise "#{self.class} 'z' must be a number" unless @z.is_a?(Numeric)
-      raise "#{self.class} 'width' must be a number"  unless @width.is_a?(Numeric)  || @width.nil?
-      raise "#{self.class} 'height' must be a number" unless @height.is_a?(Numeric) || @height.nil?
-      raise "#{self.class} 'options' must be a Hash" unless @options.is_a?(Hash)
-
-      # raise "#{self.class} 'padding' must be a number" unless @padding.is_a?(Numeric)
-
-      @enabled = true
+      stylize
 
       default_events
     end
 
+    def stylize
+      set_border_thickness(@style.border_thickness)
+
+      set_padding(@style.padding)
+
+      set_margin(@style.margin)
+
+      @style.background_canvas = Background.new
+      @style.border_canvas     = BorderCanvas.new(element: self)
+
+      set_background(@style.background)
+      set_border_color(@style.border_color)
+    end
+
     def set_background(background)
-      @background = background
-      @background_canvas.background = background
+      @style.background = background
+      @style.background_canvas.background = background
     end
 
     def set_border_thickness(border_thickness)
-      @border_thickness = border_thickness
+      @style.border_thickness = border_thickness
 
-      @border_thickness_left   = default(:border_thickness_left)   || @border_thickness
-      @border_thickness_right  = default(:border_thickness_right)  || @border_thickness
-      @border_thickness_top    = default(:border_thickness_top)    || @border_thickness
-      @border_thickness_bottom = default(:border_thickness_bottom) || @border_thickness
+      @style.border_thickness_left   = default(:border_thickness_left)   || @style.border_thickness
+      @style.border_thickness_right  = default(:border_thickness_right)  || @style.border_thickness
+      @style.border_thickness_top    = default(:border_thickness_top)    || @style.border_thickness
+      @style.border_thickness_bottom = default(:border_thickness_bottom) || @style.border_thickness
     end
 
     def set_border_color(color)
-      @border_color = color
+      @style.border_color = color
 
-      @border_color_left   = default(:border_color_left)   || @border_color
-      @border_color_right  = default(:border_color_right)  || @border_color
-      @border_color_top    = default(:border_color_top)    || @border_color
-      @border_color_bottom = default(:border_color_bottom) || @border_color
+      @style.border_color_left   = default(:border_color_left)   || @style.border_color
+      @style.border_color_right  = default(:border_color_right)  || @style.border_color
+      @style.border_color_top    = default(:border_color_top)    || @style.border_color
+      @style.border_color_bottom = default(:border_color_bottom) || @style.border_color
 
-      @border_canvas.color = color
+      @style.border_canvas.color = color
     end
 
     def set_padding(padding)
-      @padding = padding
+      @style.padding = padding
 
-      @padding_left   = default(:padding_left)   || @padding
-      @padding_right  = default(:padding_right)  || @padding
-      @padding_top    = default(:padding_top)    || @padding
-      @padding_bottom = default(:padding_bottom) || @padding
+      @style.padding_left   = default(:padding_left)   || @style.padding
+      @style.padding_right  = default(:padding_right)  || @style.padding
+      @style.padding_top    = default(:padding_top)    || @style.padding
+      @style.padding_bottom = default(:padding_bottom) || @style.padding
     end
 
     def set_margin(margin)
-      @margin = margin
+      @style.margin = margin
 
-      @margin_left   = default(:margin_left)   || @margin
-      @margin_right  = default(:margin_right)  || @margin
-      @margin_top    = default(:margin_top)    || @margin
-      @margin_bottom = default(:margin_bottom) || @margin
+      @style.margin_left   = default(:margin_left)   || @style.margin
+      @style.margin_right  = default(:margin_right)  || @style.margin
+      @style.margin_top    = default(:margin_top)    || @style.margin
+      @style.margin_bottom = default(:margin_bottom) || @style.margin
     end
 
     def default_events
@@ -122,9 +116,30 @@ module CyberarmEngine
       @enabled
     end
 
+    def visible?
+      @visible
+    end
+
+    def toggle
+      @visible = !@visible
+      root.gui_state.request_recalculate
+    end
+
+    def show
+      @visible = true
+      root.gui_state.request_recalculate
+    end
+
+    def hide
+      @visible = false
+      root.gui_state.request_recalculate
+    end
+
     def draw
-      @background_canvas.draw
-      @border_canvas.draw
+      return unless @visible
+
+      @style.background_canvas.draw
+      @style.border_canvas.draw
       render
     end
 
@@ -146,44 +161,65 @@ module CyberarmEngine
     end
 
     def width
-      (@border_thickness_left + @padding_left) + @width + (@padding_right + @border_thickness_right)
+      if visible?
+        inner_width + @width
+      else
+        0
+      end
     end
 
     def outer_width
-      @margin_left + width + @margin_right
+      @style.margin_left + width + @style.margin_right
+    end
+
+    def inner_width
+      (@style.border_thickness_left + @style.padding_left) + (@style.padding_right + @style.border_thickness_right)
     end
 
     def height
-      (@border_thickness_top + @padding_top) + @height + (@padding_bottom + @border_thickness_bottom)
+      if visible?
+        inner_height + @height
+      else
+        0
+      end
     end
 
     def outer_height
-      @margin_top + height + @margin_bottom
+      @style.margin_top + height + @style.margin_bottom
     end
 
-    def style(hash)
-      if hash
-        @style.set(hash)
+    def inner_height
+      (@style.border_thickness_top + @style.padding_top) + (@style.padding_bottom + @style.border_thickness_bottom)
+    end
+
+    private def dimensional_size(size, dimension)
+      raise "dimension must be either :width or :height" unless dimension == :width || dimension == :height
+      if size && size.is_a?(Numeric)
+        if size.between?(0.0, 1.0)
+          @parent.send(:"#{dimension}") * size
+        else
+          size
+        end
       else
-        @style.hash
+        nil
       end
     end
 
     def background=(_background)
-      @background_canvas.background=(_background)
+      @style.background_canvas.background=(_background)
       update_background
     end
 
     def update_background
-      @background_canvas.x = @x
-      @background_canvas.y = @y
-      @background_canvas.z = @z
-      @background_canvas.width  = width
-      @background_canvas.height = height
+      @style.background_canvas.x = @x
+      @style.background_canvas.y = @y
+      @style.background_canvas.z = @z
+      @style.background_canvas.width  = width
+      @style.background_canvas.height = height
 
-      @background_canvas.update
+      @style.background_canvas.update
 
-      @border_canvas.update
+      @style.border_canvas.update
     end
 
     def root
@@ -202,12 +238,15 @@ module CyberarmEngine
       @root
     end
 
+    def is_root?
+      @gui_state != nil
+    end
+
     def recalculate
       raise "#{self.class}#recalculate was not overridden!"
     end
 
     def reposition
-      raise "#{self.class}#reposition was not overridden!"
     end
 
     def value

lib/cyberarm_engine/ui/elements/button.rb

@@ -0,0 +1,55 @@
+module CyberarmEngine
+  class Element
+    class Button < Label
+      def initialize(text, options = {}, block = nil)
+        super(text, options, block)
+
+        @style.background_canvas.background = default(:background)
+      end
+
+      def render
+        draw_text
+      end
+
+      def draw_text
+        @text.draw
+      end
+
+      def enter(sender)
+        @focus = false unless window.button_down?(Gosu::MsLeft)
+
+        if @focus
+          @style.background_canvas.background = default(:active, :background)
+          @text.color = default(:active, :color)
+        else
+          @style.background_canvas.background = default(:hover, :background)
+          @text.color = default(:hover, :color)
+        end
+      end
+
+      def left_mouse_button(sender, x, y)
+        @focus = true
+        @style.background_canvas.background = default(:active, :background)
+        window.current_state.focus = self
+        @text.color = default(:active, :color)
+      end
+
+      def released_left_mouse_button(sender,x, y)
+        enter(sender)
+      end
+
+      def clicked_left_mouse_button(sender, x, y)
+        @block.call(self) if @block
+      end
+
+      def leave(sender)
+        @style.background_canvas.background = default(:background)
+        @text.color = default(:color)
+      end
+
+      def blur(sender)
+        @focus = false
+      end
+    end
+  end
+end

lib/cyberarm_engine/ui/elements/check_box.rb

@@ -0,0 +1,59 @@
+module CyberarmEngine
+  class Element
+    class CheckBox < Flow
+      def initialize(text, options, block = nil)
+        super({}, block = nil)
+        options[:toggled] = options[:checked]
+
+        @toggle_button = ToggleButton.new(options)
+        @label         = Label.new(text, options)
+
+        define_label_singletons
+
+        add(@toggle_button)
+        add(@label)
+      end
+
+      def text=(text)
+        @label.text = text
+        recalculate
+      end
+
+      def value
+        @toggle_button.value
+      end
+
+      def value=(bool)
+        @toggle_button.vlaue = bool
+      end
+
+      def define_label_singletons
+        @label.define_singleton_method(:_toggle_button) do |button|
+          @_toggle_button = button
+        end
+
+        @label._toggle_button(@toggle_button)
+
+        @label.define_singleton_method(:holding_left_mouse_button) do |sender, x, y|
+          @_toggle_button.left_mouse_button(sender, x, y)
+        end
+
+        @label.define_singleton_method(:released_left_mouse_button) do |sender, x, y|
+          @_toggle_button.released_left_mouse_button(sender, x, y)
+        end
+
+        @label.define_singleton_method(:clicked_left_mouse_button) do |sender, x, y|
+          @_toggle_button.clicked_left_mouse_button(sender, x, y)
+        end
+
+        @label.define_singleton_method(:enter) do |sender|
+          @_toggle_button.enter(sender)
+        end
+
+        @label.define_singleton_method(:leave) do |sender|
+          @_toggle_button.leave(sender)
+        end
+      end
+    end
+  end
+end

lib/cyberarm_engine/ui/elements/container.rb

@@ -0,0 +1,159 @@
+module CyberarmEngine
+  class Element
+    class Container < Element
+      include Common
+
+      attr_accessor :stroke_color, :fill_color
+      attr_reader :children, :gui_state
+      attr_reader :scroll_x, :scroll_y
+
+      def initialize(options = {}, block = nil)
+        @gui_state = options.delete(:gui_state)
+        super
+
+        @scroll_x, @scroll_y = 0, 0
+        @scroll_speed = 10
+
+        @text_color = options[:color]
+
+        @children = []
+      end
+
+      def build
+        @block.call(self) if @block
+
+        recalculate
+      end
+
+      def add(element)
+        @children << element
+
+        recalculate
+      end
+
+      def render
+        Gosu.clip_to(@x, @y, width, height) do
+          @children.each(&:draw)
+        end
+      end
+
+      def update
+        @children.each(&:update)
+      end
+
+      def hit_element?(x, y)
+        @children.reverse_each do |child|
+          case child
+          when Container
+            if element = child.hit_element?(x, y)
+              return element
+            end
+          else
+            return child if child.hit?(x, y)
+          end
+        end
+
+        self if hit?(x, y)
+      end
+
+      def recalculate
+        @current_position = Vector.new(@style.margin_left + @style.padding_left, @style.margin_top + @style.padding_top)
+        return unless visible?
+        stylize
+
+        layout
+
+        if is_root?
+          @width  = @style.width  = window.width
+          @height = @style.height = window.height
+        else
+          _width = dimensional_size(@style.width, :width)
+          _height= dimensional_size(@style.height,:height)
+          @width  = _width  ? _width  : (@children.map {|c| c.x + c.outer_width }.max || 0).round
+          @height = _height ? _height : (@children.map {|c| c.y + c.outer_height}.max || 0).round
+        end
+
+
+        # Move child to parent after positioning
+        @children.each do |child|
+          child.x += @x
+          child.y += @y
+
+          child.stylize
+          child.recalculate
+          child.reposition # TODO: Implement top,bottom,left,center, and right positioning
+        end
+
+        update_background
+      end
+
+      def layout
+        raise "Not overridden"
+      end
+
+      def max_width
+        @max_width ? @max_width : window.width - (@parent ? @parent.style.margin_right + @style.margin_right : @style.margin_right)
+      end
+
+      def fits_on_line?(element) # Flow
+        @current_position.x + element.outer_width <= max_width &&
+        @current_position.x + element.outer_width <= window.width
+      end
+
+      def position_on_current_line(element) # Flow
+        element.x = element.style.margin_left + @current_position.x
+        element.y = element.style.margin_top  + @current_position.y
+
+        element.recalculate
+
+        @current_position.x += element.outer_width
+        @current_position.x = @style.margin_left if @current_position.x >= max_width
+      end
+
+      def tallest_neighbor(querier, y_position) # Flow
+        response = querier
+        @children.each do |child|
+          response = child if child.outer_height > response.outer_height
+          break if child == querier
+        end
+
+        return response
+      end
+
+      def position_on_next_line(child) # Flow
+        @current_position.x = @style.margin_left
+        @current_position.y += tallest_neighbor(child, @current_position.y).outer_height
+
+        child.x = child.style.margin_left + @current_position.x
+        child.y = child.style.margin_top  + @current_position.y
+
+        child.recalculate
+
+        @current_position.x += child.outer_width
+      end
+
+      def move_to_next_line(element) # Stack
+        element.x = element.style.margin_left + @current_position.x
+        element.y = element.style.margin_top  + @current_position.y
+
+        element.recalculate
+
+        @current_position.y += element.outer_height
+      end
+
+      # def mouse_wheel_up(sender, x, y)
+      #   @children.each {|c| c.y -= @scroll_speed}
+      #   @children.each {|c| c.recalculate}
+      # end
+
+      # def mouse_wheel_down(sender, x, y)
+      #   @children.each {|c| c.y += @scroll_speed}
+      #   @children.each {|c| c.recalculate}
+      # end
+
+      def value
+        @children.map {|c| c.class}.join(", ")
+      end
+    end
+  end
+end

lib/cyberarm_engine/ui/elements/edit_line.rb

@@ -0,0 +1,95 @@
+module CyberarmEngine
+  class Element
+    class EditLine < Button
+      def initialize(text, options = {}, block = nil)
+        super(text, options, block)
+
+        @type = default(:type)
+
+        @caret_width = default(:caret_width)
+        @caret_height= @text.height
+        @caret_color = default(:caret_color)
+        @caret_interval = default(:caret_interval)
+        @caret_last_interval = Gosu.milliseconds
+        @show_caret  = true
+
+        @text_input = Gosu::TextInput.new
+        @text_input.text = text
+
+        return self
+      end
+
+      def render
+        Gosu.clip_to(@text.x, @text.y, @style.width, @text.height) do
+          draw_text
+          Gosu.draw_rect(caret_position, @text.y, @caret_width, @caret_height, @caret_color, @z + 40) if @focus && @show_caret
+        end
+      end
+
+      def update
+        if @type == :password
+          @text.text = default(:password_character) * @text_input.text.length
+        else
+          @text.text = @text_input.text
+        end
+
+        if Gosu.milliseconds >= @caret_last_interval + @caret_interval
+          @caret_last_interval = Gosu.milliseconds
+
+          @show_caret = !@show_caret
+        end
+      end
+
+      def left_mouse_button(sender, x, y)
+        super
+        window.text_input = @text_input
+
+        @caret_last_interval = Gosu.milliseconds
+        @show_caret = true
+      end
+
+      def enter(sender)
+        if @focus
+          @style.background_canvas.background = default(:active, :background)
+          @text.color = default(:active, :color)
+        else
+          @style.background_canvas.background = default(:hover, :background)
+          @text.color = default(:hover, :color)
+        end
+      end
+
+      def leave(sender)
+        unless @focus
+          super
+        end
+      end
+
+      def blur(sender)
+        @focus = false
+        @style.background_canvas.background = default(:background)
+        @text.color = default(:color)
+        window.text_input = nil
+      end
+
+      # TODO: Fix caret rendering in wrong position unless caret_pos is at end of text
+      def caret_position
+        if @type == :password
+          @text.x + @text.textobject.text_width(default(:password_character) * @text_input.text[0..@text_input.caret_pos-1].length)
+        else
+          @text.x + @text.textobject.text_width(@text_input.text[0..@text_input.caret_pos-1])
+        end
+      end
+
+      def recalculate
+        super
+
+        @width = dimensional_size(@style.width, :width) || default(:width)
+        update_background
+      end
+
+      def value
+        @text_input.text
+      end
+    end
+  end
+end

lib/cyberarm_engine/ui/elements/flow.rb

@@ -0,0 +1,17 @@
+module CyberarmEngine
+  class Element
+    class Flow < Container
+      include Common
+
+      def layout
+        @children.each do |child|
+          if fits_on_line?(child)
+            position_on_current_line(child)
+          else
+            position_on_next_line(child)
+          end
+        end
+      end
+    end
+  end
+end

lib/cyberarm_engine/ui/elements/image.rb

@@ -0,0 +1,50 @@
+module CyberarmEngine
+  class Element
+    class Image < Element
+      def initialize(path, options = {}, block = nil)
+        super(options, block)
+        @path = path
+
+        @image = Gosu::Image.new(path, retro: @options[:image_retro])
+        @scale_x, @scale_y = 1, 1
+      end
+
+      def render
+        @image.draw(
+          @style.border_thickness_left + @style.padding_left + @x,
+          @style.border_thickness_top + @style.padding_top + @y,
+          @z + 2,
+          @scale_x, @scale_y) # TODO: Add color support?
+      end
+
+      def clicked_left_mouse_button(sender, x, y)
+        @block.call(self) if @block
+      end
+
+      def recalculate
+        _width = dimensional_size(@style.width, :width)
+        _height= dimensional_size(@style.height,:height)
+
+        if _width && _height
+          @scale_x = _width.to_f / @image.width
+          @scale_y = _height.to_f / @image.height
+        elsif _width
+          @scale_x = _width.to_f / @image.width
+          @scale_y = @scale_x
+        elsif _height
+          @scale_y = _height.to_f / @image.height
+          @scale_x = @scale_y
+        else
+          @scale_x, @scale_y = 1, 1
+        end
+
+        @width = _width  ? _width  : @image.width.round * @scale_x
+        @height= _height ? _height : @image.height.round * @scale_y
+      end
+
+      def value
+        @path
+      end
+    end
+  end
+end

lib/cyberarm_engine/ui/elements/label.rb

@@ -0,0 +1,45 @@
+module CyberarmEngine
+  class Element
+    class Label < Element
+      def initialize(text, options = {}, block = nil)
+        super(options, block)
+
+        @text = Text.new(text, font: @options[:font], z: @z, color: @options[:color], size: @options[:text_size], shadow: @options[:text_shadow])
+      end
+
+      def render
+        @text.draw
+      end
+
+      def clicked_left_mouse_button(sender, x, y)
+        @block.call(self) if @block
+      end
+
+      def recalculate
+        _width = dimensional_size(@style.width, :width)
+        _height= dimensional_size(@style.height,:height)
+        @width = _width  ? _width  : @text.width.round
+        @height= _height ? _height : @text.height.round
+
+        @text.x = @style.border_thickness_left + @style.padding_left + @x
+        @text.y = @style.border_thickness_top + @style.padding_top  + @y
+        @text.z = @z + 3
+
+        update_background
+      end
+
+      def value
+        @text.text
+      end
+
+      def value=(value)
+        @text.text = value
+
+        old_width, old_height = width, height
+        recalculate
+
+        root.gui_state.request_recalculate if old_width != width || old_height != height
+      end
+    end
+  end
+end

lib/cyberarm_engine/ui/elements/progress.rb

@@ -0,0 +1,50 @@
+module CyberarmEngine
+  class Element
+    class Progress < Element
+      def initialize(options = {}, block = nil)
+        super(options, block)
+
+        @fraction_background = Background.new(background: @style.fraction_background)
+        self.value = options[:fraction] ? options[:fraction] : 0.0
+      end
+
+      def render
+        @fraction_background.draw
+      end
+
+      def recalculate
+        _width = dimensional_size(@style.width, :width)
+        _height= dimensional_size(@style.height,:height)
+        @width = _width
+        @height= _height
+
+        update_background
+      end
+
+      def update_background
+        super
+
+        @fraction_background.x = @style.border_thickness_left + @style.padding_left + @x
+        @fraction_background.y = @style.border_thickness_top + @style.padding_top + @y
+        @fraction_background.z = @z
+        @fraction_background.width = @width * @fraction
+        @fraction_background.height = @height
+
+        @fraction_background.background = @style.fraction_background
+      end
+
+      def value
+        @fraction
+      end
+
+      def value=(decimal)
+        raise "value must be number" unless decimal.is_a?(Numeric)
+
+        @fraction = decimal.clamp(0.0, 1.0)
+        update_background
+
+        return @fraction
+      end
+    end
+  end
+end

lib/cyberarm_engine/ui/elements/stack.rb

@@ -0,0 +1,13 @@
+module CyberarmEngine
+  class Element
+    class Stack < Container
+      include Common
+
+      def layout
+        @children.each do |child|
+          move_to_next_line(child)
+        end
+      end
+    end
+  end
+end

lib/cyberarm_engine/ui/elements/toggle_button.rb

@@ -0,0 +1,54 @@
+module CyberarmEngine
+  class Element
+    class ToggleButton < Button
+      attr_reader :toggled
+
+      def initialize(options, block = nil)
+        super(options[:checkmark], options, block)
+        @toggled = options[:toggled] || false
+        if @toggled
+          @text.text = @options[:checkmark]
+        else
+          @text.text = ""
+        end
+
+        return self
+      end
+
+      def toggled=(boolean)
+        @toggled = !boolean
+        toggle
+      end
+
+      def clicked_left_mouse_button(sender, x, y)
+        toggle
+
+        @block.call(self) if @block
+      end
+
+      def toggle
+        if @toggled
+          @toggled = false
+          @text.text = ""
+        else
+          @toggled = true
+          @text.text = @options[:checkmark]
+        end
+      end
+
+      def recalculate
+        super
+
+        _width = dimensional_size(@style.width, :width)
+        _height= dimensional_size(@style.height,:height)
+        @width  = _width  ? _width  : @text.textobject.text_width(@options[:checkmark])
+        @height = _height ? _height : @text.height
+        update_background
+      end
+
+      def value
+        @toggled
+      end
+    end
+  end
+end

lib/cyberarm_engine/ui/flow.rb

@@ -1,15 +0,0 @@
-module CyberarmEngine
-  class Flow < Container
-    include Common
-
-    def layout
-      @children.each do |child|
-        if fits_on_line?(child)
-          position_on_current_line(child)
-        else
-          position_on_next_line(child)
-        end
-      end
-    end
-  end
-end

lib/cyberarm_engine/ui/gui_state.rb

@@ -10,15 +10,18 @@ module CyberarmEngine
 
       @down_keys = {}
 
-      @root_container = Stack.new
+      @root_container = Element::Stack.new(gui_state: self)
       @game_objects << @root_container
       @containers     = [@root_container]
 
+      @active_width  = window.width
+      @active_height = window.height
+
       @focus = nil
       @mouse_over = nil
       @mouse_down_on = {}
       @mouse_down_position = {}
-
+      @pending_recalculate_request = false
 
       setup
     end
@@ -35,6 +38,11 @@ module CyberarmEngine
     end
 
     def update
+      if @pending_recalculate_request
+        @root_container.recalculate
+        @pending_recalculate_request = false
+      end
+
       super
 
       new_mouse_over = @root_container.hit_element?(window.mouse_x, window.mouse_y)
@@ -49,6 +57,11 @@ module CyberarmEngine
       redirect_holding_mouse_button(:left) if @mouse_over && Gosu.button_down?(Gosu::MsLeft)
       redirect_holding_mouse_button(:middle) if @mouse_over && Gosu.button_down?(Gosu::MsMiddle)
       redirect_holding_mouse_button(:right) if @mouse_over && Gosu.button_down?(Gosu::MsRight)
+
+      request_recalculate if @active_width != window.width || @active_height != window.height
+
+      @active_width  = window.width
+      @active_height = window.height
     end
 
     def button_down(id)
@@ -115,5 +128,10 @@ module CyberarmEngine
     def redirect_mouse_wheel(button)
       @mouse_over.publish(:"mouse_wheel_#{button}", window.mouse_x, window.mouse_y) if @mouse_over
     end
+
+    # Schedule a full GUI recalculation on next update
+    def request_recalculate
+      @pending_recalculate_request = true
+    end
   end
 end

lib/cyberarm_engine/ui/image.rb

@@ -1,42 +0,0 @@
-module CyberarmEngine
-  class Image < Element
-    def initialize(path, options = {}, block = nil)
-      super(options, block)
-      @path = path
-
-      @image = Gosu::Image.new(path, retro: @options[:image_retro])
-      if @options[:width] && @options[:height]
-        @scale_x = @options[:width].to_f / @image.width
-        @scale_y = @options[:height].to_f / @image.height
-      elsif @options[:width]
-        @scale_x = @options[:width].to_f / @image.width
-        @scale_y = @scale_x
-      elsif @options[:height]
-        @scale_y = @options[:height].to_f / @image.height
-        @scale_x = @scale_y
-      else
-        @scale_x, @scale_y = 1, 1
-      end
-
-      raise "Scale X" unless @scale_x.is_a?(Numeric)
-      raise "Scale Y" unless @scale_y.is_a?(Numeric)
-    end
-
-    def render
-      @image.draw(@border_thickness_left + @padding_left + @x, @border_thickness_top + @padding_top + @y, @z + 2, @scale_x, @scale_y) # TODO: Add color support?
-    end
-
-    def clicked_left_mouse_button(sender, x, y)
-      @block.call(self) if @block
-    end
-
-    def recalculate
-      @width  = @image.width * @scale_x
-      @height = @image.height * @scale_y
-    end
-
-    def value
-      @path
-    end
-  end
-end

lib/cyberarm_engine/ui/label.rb

@@ -1,43 +0,0 @@
-module CyberarmEngine
-  class Label < Element
-    def initialize(text, options = {}, block = nil)
-      super(options, block)
-
-      @text = Text.new(text, font: @options[:font], z: @z, color: @options[:color], size: @options[:text_size], shadow: @options[:text_shadow])
-
-      return self
-    end
-
-    def render
-      @text.draw
-    end
-
-    def clicked_left_mouse_button(sender, x, y)
-      @block.call(self) if @block
-    end
-
-    def recalculate
-      @width = @text.width.round
-      @height= @text.height.round
-
-      @text.x = @border_thickness_left + @padding_left + @x
-      @text.y = @border_thickness_top + @padding_top  + @y
-      @text.z = @z + 3
-
-      update_background
-    end
-
-    def value
-      @text.text
-    end
-
-    def value=(value)
-      @text.text = value
-
-      old_width, old_height = width, height
-      recalculate
-
-      root.recalculate if old_width != width || old_height != height
-    end
-  end
-end

lib/cyberarm_engine/ui/stack.rb

@@ -1,11 +0,0 @@
-module CyberarmEngine
-  class Stack < Container
-    include Common
-
-    def layout
-      @children.each do |child|
-        move_to_next_line(child)
-      end
-    end
-  end
-end

lib/cyberarm_engine/ui/style.rb

@@ -1,15 +1,37 @@
+module Gosu
+  class Color
+    def _dump(level)
+      [
+        "%02X" % self.alpha,
+        "%02X" % self.red,
+        "%02X" % self.green,
+        "%02X" % self.blue
+      ].join
+    end
+
+    def self._load(hex)
+      argb(hex.to_i(16))
+    end
+  end
+end
+
 module CyberarmEngine
   class Style
-    def initialize(hash)
-      @hash = hash
+    def initialize(hash = {})
+      @hash = Marshal.load(Marshal.dump(hash))
     end
 
-    def hash
-      @hash
-    end
+    def method_missing(method, *args, &block)
+      if method.to_s.end_with?("=")
+        raise "Did not expect more than 1 argument" if args.size > 1
+        return @hash[method.to_s.sub("=", "").to_sym] = args.first
 
-    def set(hash)
-      @hash.merge!(hash)
+      elsif args.size == 0
+        return @hash[method]
+
+      else
+        raise ArgumentError, "Did not expect arguments"
+      end
     end
   end
 end

lib/cyberarm_engine/ui/theme.rb

@@ -13,7 +13,7 @@ module CyberarmEngine
       raise "Error" unless self.class.ancestors.include?(CyberarmEngine::Element)
       _theme = THEME
       _theme = _theme.merge(options[:theme]) if options[:theme]
-      options.delete(:theme)
+      _theme.delete(:theme) if options[:theme]
 
       hash = {}
       class_names = self.class.ancestors
@@ -26,7 +26,23 @@ module CyberarmEngine
         end
       end
 
-      hash.merge(options)
+      deep_merge(hash, options)
+    end
+
+    # Derived from Rails Hash#deep_merge!
+    # Enables passing partial themes through Element options without issue
+    def deep_merge(original, intergrate, &block)
+      hash = original.merge(intergrate) do |key, this_val, other_val|
+        if this_val.is_a?(Hash) && other_val.is_a?(Hash)
+          deep_merge(this_val, other_val, &block)
+        elsif block_given?
+          block.call(key, this_val, other_val)
+        else
+          other_val
+        end
+      end
+
+      return hash
     end
 
     THEME = {
@@ -74,7 +90,7 @@ module CyberarmEngine
         caret_interval: 500,
       },
 
-      Image: {
+      Image: { # < Element
         retro: false
       },
 
@@ -88,7 +104,16 @@ module CyberarmEngine
 
       ToggleButton: { # < Button
         checkmark: "√"
+      },
+
+      Progress: { # < Element
+        width: 250,
+        height: 36,
+        background: 0xff111111,
+        fraction_background: [0xffc75e61, 0xffe26623],
+        border_thickness: 4,
+        border_color: [0xffd59674, 0xffff8746]
       }
     }.freeze
   end
-end
+end

lib/cyberarm_engine/ui/toggle_button.rb

@@ -1,49 +0,0 @@
-module CyberarmEngine
-  class ToggleButton < Button
-    attr_reader :toggled
-
-    def initialize(options, block = nil)
-      super(options[:checkmark], options, block)
-      @toggled = options[:toggled] || false
-      if @toggled
-        @text.text = @options[:checkmark]
-      else
-        @text.text = ""
-      end
-
-      return self
-    end
-
-    def toggled=(boolean)
-      @toggled = !boolean
-      toggle
-    end
-
-    def clicked_left_mouse_button(sender, x, y)
-      toggle
-
-      @block.call(self) if @block
-    end
-
-    def toggle
-      if @toggled
-        @toggled = false
-        @text.text = ""
-      else
-        @toggled = true
-        @text.text = @options[:checkmark]
-      end
-    end
-
-    def recalculate
-      super
-
-      @width = @text.textobject.text_width(@options[:checkmark])
-      update_background
-    end
-
-    def value
-      @toggled
-    end
-  end
-end

lib/cyberarm_engine/version.rb

@@ -1,4 +1,4 @@
 module CyberarmEngine
   NAME    = "InDev"
-  VERSION = "0.6.0"
+  VERSION = "0.10.0"
 end