lighttroupe/luz

class ProjectEffectAspectRatio < ProjectEffect
    title                "Aspect Ratio"
    description "Adjusts aspect ratio for the display in use to ensure that square objects appear square."

    hint "Place this before drawing Directors."

    setting 'mode', :select, :default => :stretched, :options => [[:stretched, 'Stretched'], [:square_horizontal, 'Square (stretch horizontally)'], [:square_vertical, 'Square (stretch vertically)']]

    def render
        ratio = ($application.width.to_f / $application.height)

        # ratio is a number above 1.0 for most monitors
        case mode
        when :stretched        # 1x1 shapes appear stretched horizontally (normal luz behavior)
            yield

        when :square_horizontal
            with_scale(1.0 / ratio, 1.0) {
                with_env(:aspect_scale, ratio) {        # this informs anything about the need to scale larger to fill the screen
                    yield
                }
            }

        when :square_vertical
            with_scale(1.0, 1.0 * ratio) {
                yield
            }

        else
            raise "unhandled mode '#{mode}'"
        end
    end
end