Qt 5.6 | Qt 3D | Qt 3D: Basic Shapes C++ Example | main.cpp Example File

Qt 5.6.3 Reference Documentation

# main.cpp Example File

basicshapes-cpp/main.cpp

      /****************************************************************************
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      ** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
      ** Contact: http://www.qt-project.org/legal
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      #include "scenemodifier.h"

      #include <QGuiApplication>

      #include <window.h>
      #include <Qt3DCore/qcamera.h>
      #include <Qt3DCore/qentity.h>
      #include <Qt3DCore/qcameralens.h>

      #include <QtWidgets/QApplication>
      #include <QtWidgets/QWidget>
      #include <QtWidgets/QHBoxLayout>
      #include <QtWidgets/QCheckBox>
      #include <QtWidgets/QCommandLinkButton>
      #include <QtGui/QScreen>

      #include <Qt3DInput/QInputAspect>

      #include <Qt3DRender/qtorusmesh.h>
      #include <Qt3DRender/qmesh.h>
      #include <Qt3DRender/qtechnique.h>
      #include <Qt3DRender/qmaterial.h>
      #include <Qt3DRender/qeffect.h>
      #include <Qt3DRender/qtexture.h>
      #include <Qt3DRender/qrenderpass.h>
      #include <Qt3DRender/qsceneloader.h>

      #include <Qt3DCore/qtransform.h>
      #include <Qt3DCore/qaspectengine.h>

      #include <Qt3DRender/qrenderaspect.h>
      #include <Qt3DRender/qframegraph.h>
      #include <Qt3DRender/qforwardrenderer.h>

      int main(int argc, char **argv)
      {
          QApplication app(argc, argv);
          Window *view = new Window();
          QWidget *container = QWidget::createWindowContainer(view);
          QSize screenSize = view->screen()->size();
          container->setMinimumSize(QSize(200, 100));
          container->setMaximumSize(screenSize);

          QWidget *widget = new QWidget;
          QHBoxLayout *hLayout = new QHBoxLayout(widget);
          QVBoxLayout *vLayout = new QVBoxLayout();
          vLayout->setAlignment(Qt::AlignTop);
          hLayout->addWidget(container, 1);
          hLayout->addLayout(vLayout);

          widget->setWindowTitle(QStringLiteral("Basic shapes"));

          Qt3DCore::QAspectEngine engine;
          engine.registerAspect(new Qt3DRender::QRenderAspect());
          Qt3DInput::QInputAspect *input = new Qt3DInput::QInputAspect;
          engine.registerAspect(input);
          QVariantMap data;
          data.insert(QStringLiteral("surface"), QVariant::fromValue(static_cast<QSurface *>(view)));
          data.insert(QStringLiteral("eventSource"), QVariant::fromValue(view));
          engine.setData(data);

          // Root entity
          Qt3DCore::QEntity *rootEntity = new Qt3DCore::QEntity();

          // Camera
          Qt3DCore::QCamera *cameraEntity = new Qt3DCore::QCamera(rootEntity);
          cameraEntity->setObjectName(QStringLiteral("cameraEntity"));

          cameraEntity->lens()->setPerspectiveProjection(45.0f, 16.0f/9.0f, 0.1f, 1000.0f);
          cameraEntity->setPosition(QVector3D(0, 0, -20.0f));
          cameraEntity->setUpVector(QVector3D(0, 1, 0));
          cameraEntity->setViewCenter(QVector3D(0, 0, 0));
          input->setCamera(cameraEntity);

          // FrameGraph
          Qt3DRender::QFrameGraph *frameGraph = new Qt3DRender::QFrameGraph();
          Qt3DRender::QForwardRenderer *forwardRenderer = new Qt3DRender::QForwardRenderer();

          forwardRenderer->setCamera(cameraEntity);
          forwardRenderer->setClearColor(QColor(QRgb(0x4d4d4f)));
          frameGraph->setActiveFrameGraph(forwardRenderer);

          // Setting the FrameGraph
          rootEntity->addComponent(frameGraph);

          // Scenemodifier
          SceneModifier *modifier = new SceneModifier(rootEntity);

          // Set root object of the scene
          engine.setRootEntity(rootEntity);

          // Create control widgets
          QCommandLinkButton *info = new QCommandLinkButton();
          info->setText(QStringLiteral("Qt3D ready-made meshes"));
          info->setDescription(QStringLiteral("Qt3D provides several ready-made meshes, like torus, cylinder, cube and sphere."));
          info->setIconSize(QSize(0,0));

          QCheckBox *torusCB = new QCheckBox(widget);
          torusCB->setChecked(true);
          torusCB->setText(QStringLiteral("Torus"));

          QCheckBox *cylinderCB = new QCheckBox(widget);
          cylinderCB->setChecked(true);
          cylinderCB->setText(QStringLiteral("Cylinder"));

          QCheckBox *cuboidCB = new QCheckBox(widget);
          cuboidCB->setChecked(true);
          cuboidCB->setText(QStringLiteral("Cuboid"));

          QCheckBox *sphereCB = new QCheckBox(widget);
          sphereCB->setChecked(true);
          sphereCB->setText(QStringLiteral("Sphere"));

          vLayout->addWidget(info);
          vLayout->addWidget(torusCB);
          vLayout->addWidget(cylinderCB);
          vLayout->addWidget(cuboidCB);
          vLayout->addWidget(sphereCB);

          QObject::connect(torusCB, &QCheckBox::stateChanged,
                           modifier, &SceneModifier::enableTorus);
          QObject::connect(cylinderCB, &QCheckBox::stateChanged,
                           modifier, &SceneModifier::enableCylinder);
          QObject::connect(cuboidCB, &QCheckBox::stateChanged,
                           modifier, &SceneModifier::enableCuboid);
          QObject::connect(sphereCB, &QCheckBox::stateChanged,
                           modifier, &SceneModifier::enableSphere);

          torusCB->setChecked(true);
          cylinderCB->setChecked(true);
          cuboidCB->setChecked(true);
          sphereCB->setChecked(true);

          // Show window
          widget->show();
          widget->resize(1200, 800);

          // Update the aspect ratio
          QSize widgetSize =  container->size();
          float aspectRatio = float(widgetSize.width()) / float(widgetSize.height());
          cameraEntity->lens()->setPerspectiveProjection(45.0f, aspectRatio, 0.1f, 1000.0f);

          return app.exec();
      }