gistfile1.rb

module UI
  class Canvas
    def initialize x, y, w, h
      @pointer = Native.ofxuicanvas_new x.to_f, y.to_f, w.to_f, h.to_f
    end

    def font file
      Native.ofxuicanvas_setFont @pointer, File.expand_path(file).to_ptr, true, true, true, 0.0, 150
    end

    def add_button name, value, x, y, w, h
      Native.ofxuicanvas_addButton @pointer, name.to_ptr, value, x.to_f, y.to_f, w.to_f, h.to_f
    end

    def add_slider name, value, min, max, x, y, w, h
      Native.ofxuicanvas_addSlider @pointer, name.to_ptr, min.to_f, max.to_f, value.to_f, x.to_f, y.to_f, w.to_f, h.to_f
    end

    def draw
      Native.ofxuicanvas_draw @pointer
    end

    module Native
      extend FFI::Cpp::Library
      ffi_lib "scratch/ofxUI.so"

      typedef :pointer, :ofxUIWidget
      enum :ofxWidgetAlignment,
            [ :align_left,
            :align_free,
            :align_right,
            :align_top,
            :align_bottom ]

      attach_constructor :ofxUICanvas, 528, [:float, :float, :float, :float]
      attach_method :ofxUICanvas, :addWidgetDown, [:ofxUIWidget, :ofxWidgetAlignment, :bool], :pointer
      attach_method :ofxUICanvas, :setFont, [:stdstring, :bool, :bool, :bool, :float, :int], :bool
      attach_method :ofxUICanvas, :addButton, [:stdstring, :bool, :float, :float, :float, :float], :pointer
      attach_method :ofxUICanvas, :addFPS, [:int], :pointer
      attach_method :ofxUICanvas, :addSlider, [:stdstring, :float, :float, :float, :float, :float, :float, :float], :pointer

      attach_method :ofxUICanvas, :draw, [], :void
    end
  end
end