Qt 5.7 | Qt 3D | Qt 3D: Materials C++ Example | trefoilknot.cpp Example File

Qt 5.7.1 Reference Documentation

# trefoilknot.cpp Example File

materials-cpp/trefoilknot.cpp

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      #include "trefoilknot.h"

      TrefoilKnot::TrefoilKnot(Qt3DCore::QNode *parent)
          : Qt3DCore::QEntity(parent)
          , m_mesh(new Qt3DRender::QMesh())
          , m_transform(new Qt3DCore::QTransform())
          , m_position()
          , m_scale(1.0f)
      {
          m_mesh->setSource(QUrl("qrc:/assets/obj/trefoil.obj"));
          addComponent(m_mesh);
          addComponent(m_transform);
      }

      TrefoilKnot::~TrefoilKnot()
      {
      }

      void TrefoilKnot::updateTransform()
      {
          QMatrix4x4 m;
          m.translate(m_position);
          m.rotate(m_phi, QVector3D(1.0f, 0.0f, 0.0f));
          m.rotate(m_phi, QVector3D(0.0f, 1.0f, 0.0f));
          m.scale(m_scale);
          m_transform->setMatrix(m);
      }

      float TrefoilKnot::theta() const
      {
          return m_theta;
      }

      float TrefoilKnot::phi() const
      {
          return m_phi;
      }

      QVector3D TrefoilKnot::position() const
      {
          return m_position;
      }

      float TrefoilKnot::scale() const
      {
          return m_scale;
      }

      void TrefoilKnot::setTheta(float theta)
      {
          if (m_theta == theta)
              return;

          m_theta = theta;
          emit thetaChanged(theta);
          updateTransform();
      }

      void TrefoilKnot::setPhi(float phi)
      {
          if (m_phi == phi)
              return;

          m_phi = phi;
          emit phiChanged(phi);
          updateTransform();
      }

      void TrefoilKnot::setPosition(QVector3D position)
      {
          if (m_position == position)
              return;

          m_position = position;
          emit positionChanged(position);
          updateTransform();
      }

      void TrefoilKnot::setScale(float scale)
      {
          if (m_scale == scale)
              return;

          m_scale = scale;
          emit scaleChanged(scale);
          updateTransform();
      }