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);
  }