orbittransformcontroller.cpp Example File

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 #include "orbittransformcontroller.h"

 #include <Qt3DCore/qtransform.h>

 OrbitTransformController::OrbitTransformController(QObject *parent)
     : QObject(parent)
     , m_target(nullptr)
     , m_matrix()
     , m_radius(1.0f)
     , m_angle(0.0f)
 {
 }

 void OrbitTransformController::setTarget(Qt3DCore::QTransform *target)
 {
     if (m_target != target) {
         m_target = target;
         emit targetChanged();
     }
 }

 Qt3DCore::QTransform *OrbitTransformController::target() const
 {
     return m_target;
 }

 void OrbitTransformController::setRadius(float radius)
 {
     if (!qFuzzyCompare(radius, m_radius)) {
         m_radius = radius;
         updateMatrix();
         emit radiusChanged();
     }
 }

 float OrbitTransformController::radius() const
 {
     return m_radius;
 }

 void OrbitTransformController::setAngle(float angle)
 {
     if (!qFuzzyCompare(angle, m_angle)) {
         m_angle = angle;
         updateMatrix();
         emit angleChanged();
     }
 }

 float OrbitTransformController::angle() const
 {
     return m_angle;
 }

 void OrbitTransformController::updateMatrix()
 {
     m_matrix.setToIdentity();
     m_matrix.rotate(m_angle, QVector3D(0.0f, 1.0f, 0.0f));
     m_matrix.translate(m_radius, 0.0f, 0.0f);
     m_target->setMatrix(m_matrix);
 }