guiScene.h

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// Luanti
// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (C) 2020 Jean-Patrick Guerrero <jeanpatrick.guerrero@gmail.com>
 
#pragma once
 
#include "irrlichttypes_extrabloated.h"
#include "ICameraSceneNode.h"
#include "StyleSpec.h"
 
using namespace irr;
 
class GUIScene : public gui::IGUIElement
{
public:
        GUIScene(gui::IGUIEnvironment *env, scene::ISceneManager *smgr,
                 gui::IGUIElement *parent, core::recti rect, s32 id = -1);
 
        ~GUIScene();
 
        scene::IAnimatedMeshSceneNode *setMesh(scene::IAnimatedMesh *mesh = nullptr);
        void setTexture(u32 idx, video::ITexture *texture);
        void setBackgroundColor(const video::SColor &color) noexcept { m_bgcolor = color; };
        void setFrameLoop(f32 begin, f32 end);
        void setAnimationSpeed(f32 speed);
        void enableMouseControl(bool enable) noexcept { m_mouse_ctrl = enable; };
        void setRotation(v2f rot) noexcept { m_custom_rot = rot; };
        void enableContinuousRotation(bool enable) noexcept { m_inf_rot = enable; };
        void setStyles(const std::array<StyleSpec, StyleSpec::NUM_STATES> &styles);
 
        virtual void draw();
        virtual bool OnEvent(const SEvent &event);
 
private:
        void calcOptimalDistance();
        void updateTargetPos();
        void updateCamera(scene::ISceneNode *target);
        void setCameraRotation(v3f rot);
        bool correctBounds(v3f &rot);
        void cameraLoop();
 
        void updateCameraPos() { m_cam_pos = m_cam->getPosition(); };
        v3f getCameraRotation() const { return (m_cam_pos - m_target_pos).getHorizontalAngle(); };
        void rotateCamera(const v3f &delta) { setCameraRotation(getCameraRotation() + delta); };
 
        scene::ISceneManager *m_smgr;
        video::IVideoDriver *m_driver;
        scene::ICameraSceneNode *m_cam;
        scene::ISceneNode *m_target = nullptr;
        scene::IAnimatedMeshSceneNode *m_mesh = nullptr;
 
        f32 m_cam_distance = 50.f;
 
        u64 m_last_time = 0;
 
        v3f m_cam_pos;
        v3f m_target_pos;
        v3f m_last_target_pos;
        // Cursor positions
        v2f m_curr_pos;
        v2f m_last_pos;
        // Initial rotation
        v2f m_custom_rot;
 
        bool m_mouse_ctrl = true;
        bool m_update_cam = false;
        bool m_inf_rot    = false;
        bool m_initial_rotation = true;
 
        video::SColor m_bgcolor = 0;
};