Q3DScatter Class

The Q3DScatter class provides methods for rendering 3D scatter graphs. More...

Header: #include <Q3DScatter>
CMake: find_package(Qt6 REQUIRED COMPONENTS DataVisualization)
target_link_libraries(mytarget PRIVATE Qt6::DataVisualization)
qmake: QT += datavisualization
Since: QtDataVisualization 1.0
Inherits: QAbstract3DGraph

Properties

Public Functions

virtual ~Q3DScatter()
QList<QValue3DAxis *> axes() const
QValue3DAxis *axisX() const
QValue3DAxis *axisY() const
QValue3DAxis *axisZ() const
QScatter3DSeries *selectedSeries() const
QList<QScatter3DSeries *> seriesList() const
void setAxisX()
void setAxisY()
void setAxisZ()

Signals

Detailed Description

This class enables developers to render scatter graphs in 3D and to view them by rotating the scene freely. Rotation is done by holding down the right mouse button and moving the mouse. Zooming is done by mouse wheel. Selection, if enabled, is done by left mouse button. The scene can be reset to default camera view by clicking mouse wheel. In touch devices rotation is done by tap-and-move, selection by tap-and-hold and zoom by pinch.

If no axes are set explicitly to Q3DScatter, temporary default axes with no labels are created. These default axes can be modified via axis accessors, but as soon any axis is set explicitly for the orientation, the default axis for that orientation is destroyed.

Q3DScatter supports more than one series visible at the same time.

How to construct a minimal Q3DScatter graph

First, construct Q3DScatter. Since we are running the graph as top level window in this example, we need to clear the Qt::FramelessWindowHint flag, which gets set by default:

 Q3DScatter scatter;
 scatter.setFlags(scatter.flags() ^ Qt::FramelessWindowHint);

Now Q3DScatter is ready to receive data to be rendered. Add one series of 3 QVector3D items:

 QScatter3DSeries *series = new QScatter3DSeries;
 QScatterDataArray data;
 data << QVector3D(0.5f, 0.5f, 0.5f) << QVector3D(-0.3f, -0.5f, -0.4f) << QVector3D(0.0f, -0.3f, 0.2f);
 series->dataProxy()->addItems(data);
 scatter.addSeries(series);

Finally you will need to set it visible:

 scatter.show();

The complete code needed to create and display this graph is:

 #include <QtDataVisualization>

 int main(int argc, char **argv)
 {
     qputenv("QSG_RHI_BACKEND", "opengl");
     QGuiApplication app(argc, argv);

     Q3DScatter scatter;
     scatter.setFlags(scatter.flags() ^ Qt::FramelessWindowHint);
     QScatter3DSeries *series = new QScatter3DSeries;
     QScatterDataArray data;
     data << QVector3D(0.5f, 0.5f, 0.5f) << QVector3D(-0.3f, -0.5f, -0.4f) << QVector3D(0.0f, -0.3f, 0.2f);
     series->dataProxy()->addItems(data);
     scatter.addSeries(series);
     scatter.show();

     return app.exec();
 }

And this is what those few lines of code produce:

The scene can be rotated, zoomed into, and an item can be selected to view its position, but no other interaction is included in this minimal code example. You can learn more by familiarizing yourself with the examples provided, like the Scatter Graph.

See also Q3DBars, Q3DSurface, and Qt Data Visualization C++ Classes.

Property Documentation

axisX : QValue3DAxis*

This property holds the active x-axis.

Access functions:

QValue3DAxis *axisX() const
void setAxisX()

Notifier signal:

void axisXChanged()

axisY : QValue3DAxis*

This property holds the active y-axis.

Access functions:

QValue3DAxis *axisY() const
void setAxisY()

Notifier signal:

void axisYChanged()

axisZ : QValue3DAxis*

This property holds the active z-axis.

Access functions:

QValue3DAxis *axisZ() const
void setAxisZ()

Notifier signal:

void axisZChanged()

[read-only] selectedSeries : QScatter3DSeries* const

This property holds the selected series or null.

Access functions:

QScatter3DSeries *selectedSeries() const

Notifier signal:

void selectedSeriesChanged()

Member Function Documentation

[virtual] Q3DScatter::~Q3DScatter()

Destroys the 3D scatter graph.

QList<QValue3DAxis *> Q3DScatter::axes() const

Returns the list of all added axes.

See also addAxis().

QValue3DAxis *Q3DScatter::axisZ() const

Returns the used z-axis.

Note: Getter function for property axisZ.

See also setAxisZ().

QList<QScatter3DSeries *> Q3DScatter::seriesList() const

Returns the list of series added to this graph.

See also QAbstract3DGraph::hasSeries().