lighttroupe/luz-next

class GuiCurveRenderer < GuiUserObjectRenderer
    UP_COLOR = [0.35, 0.75, 0.25, 1.0]
    DOWN_COLOR = [0.80, 0.0, 0.0, 1.0]
    MIDDLE_COLOR = [0.95, 0.50, 0.0, 1.0]
    LOOPING_COLOR = [0.8, 0.8, 0.0, 1.0]
    MISC_COLOR = [0.5, 0.5, 0.8, 1.0]
    FLOOR_COLOR = [0.0, 0.0, 0.0, 0.9]

    POINTS_IN_ICON = 200

    #
    # Rendering
    #
    def gui_render
        gui_render_background
        gui_render_curve
    end

private

    def gui_render_curve
        with_color(gui_icon_color) {
            @object.gui_render_list = GL.RenderCached(@object.gui_render_list) {
                with_translation(-0.5, -0.5) {
                    vertices = []
                    GL.Begin(GL::TRIANGLE_STRIP)
                        GL.Vertex(0.0, 0.0)
                        POINTS_IN_ICON.times { |i|
                            GL.Vertex(x=(i * 1.0/POINTS_IN_ICON), @object.value(x))
                            GL.Vertex(((i+1) * 1.0/POINTS_IN_ICON), 0.0)
                        }
                        GL.Vertex(1.0, @object.value(1.0))
                        GL.Vertex(1.0, 0.0)
                    GL.End
                }
            }
        }
    end

    def gui_icon_color
        if @object.up?                    # lower left to upper right (/)
            UP_COLOR
        elsif @object.down?            # upper left to lower right (\)
            DOWN_COLOR
        elsif @object.middle?        # starts and ends on 0.5 (~)
            MIDDLE_COLOR
        elsif @object.looping?    # starts and ends on same value
            LOOPING_COLOR
        else                        # anything else
            MISC_COLOR
        end
    end
end