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50
51#include "examplescene.h"
52#include "boxentity.h"
53
54#include <QTimer>
55#include <qmath.h>
56
57ExampleScene::ExampleScene(Qt3DCore::QNode *parent)
58 : Qt3DCore::QEntity(parent)
59 , m_timer(new QTimer(this))
60 , m_even(true)
61{
62 buildScene();
63 QObject::connect(asender: m_timer, SIGNAL(timeout()), SLOT(updateScene()));
64 m_timer->setInterval(1200);
65 m_timer->start();
66}
67
68ExampleScene::~ExampleScene()
69{
70 qDeleteAll(c: m_entities);
71}
72
73void ExampleScene::updateScene()
74{
75 for (int i = 0; i < m_entities.size(); ++i) {
76 const bool visible = (i % 2) ^ static_cast<int>(m_even);
77 m_entities[i]->setParent(visible ? this : nullptr);
78 }
79 m_even = !m_even;
80}
81
82void ExampleScene::buildScene()
83{
84 int count = 20;
85 const float radius = 5.0f;
86
87 for (int i = 0; i < count; ++i) {
88 BoxEntity *entity = new BoxEntity;
89 const float angle = M_PI * 2.0f * float(i) / count;
90 entity->setAngle(angle);
91 entity->setRadius(radius);
92 entity->setDiffuseColor(QColor(qFabs(v: qCos(v: angle)) * 255, 204, 75));
93 m_entities.append(t: entity);
94 }
95}
96
97

source code of qt3d/tests/manual/dynamicscene-cpp/examplescene.cpp