guiScene.h

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/*
Minetest
Copyright (C) 2020 Jean-Patrick Guerrero <jeanpatrick.guerrero@gmail.com>
 
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
 
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.
 
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
 
#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(s32 begin, s32 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;
};