gui_ruler.h

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#pragma once
 
#include <liboscar/graphics/scene/scene_collision.h>
#include <liboscar/maths/vector.h>
 
#include <optional>
 
namespace osc { class Rect; }
namespace osc { struct PolarPerspectiveCamera; }
 
namespace osc
{
    class GuiRuler final {
    public:
        void on_draw(
            const PolarPerspectiveCamera&,
            const Rect& render_rect,
            std::optional<SceneCollision>
        );
        void start_measuring();
        void stop_measuring();
        void toggle_measuring();
        bool is_measuring() const;
 
    private:
        enum class State { Inactive, WaitingForFirstPoint, WaitingForSecondPoint };
 
        State state_ = State::Inactive;
        Vector3 start_world_pos_ = {};
    };
}