Qt Quick 3D - Robot Arm Example

 // Copyright (C) 2022 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

 #ifndef BACKEND_H
 #define BACKEND_H

 #include "animatedparam.h"

 #include <QObject>
 #include <qqmlregistration.h>

 class Backend : public QObject
 {
     Q_OBJECT
     QML_ELEMENT
     Q_PROPERTY(int rotation1Angle READ rotation1Angle WRITE setRot1Angle NOTIFY rot1AngleChanged)
     Q_PROPERTY(int rotation2Angle READ rotation2Angle WRITE setRot2Angle NOTIFY rot2AngleChanged)
     Q_PROPERTY(int rotation3Angle READ rotation3Angle WRITE setRot3Angle NOTIFY rot3AngleChanged)
     Q_PROPERTY(int rotation4Angle READ rotation4Angle WRITE setRot4Angle NOTIFY rot4AngleChanged)
     Q_PROPERTY(int clawsAngle READ clawsAngle WRITE setClawsAngle NOTIFY clawsAngleChanged)
     Q_PROPERTY(QString status READ status BINDABLE bindableStatus)

 public:
     explicit Backend(QObject *parent = nullptr);

     int rotation1Angle() const;
     void setRot1Angle(const int angle);

     int rotation2Angle() const;
     void setRot2Angle(const int angle);

     int rotation3Angle() const;
     void setRot3Angle(const int angle);

     int rotation4Angle() const;
     void setRot4Angle(const int angle);

     int clawsAngle() const;
     void setClawsAngle(const int angle);

     QString status() const;
     QBindable<QString> bindableStatus() const;

 signals:
     void rot1AngleChanged();
     void rot2AngleChanged();
     void rot3AngleChanged();
     void rot4AngleChanged();
     void clawsAngleChanged();

 private:
     AnimatedParam m_rotation1Angle;
     AnimatedParam m_rotation2Angle;
     AnimatedParam m_rotation3Angle;
     AnimatedParam m_rotation4Angle;
     AnimatedParam m_clawsAngle;

     QProperty<QString> m_status;
     QProperty<bool> m_isCollision;

     void detectCollision();
 };

 #endif // BACKEND_H