Q3DSurface Class

First, construct Q3DSurface. 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:

Q3DSurface surface;
surface.setFlags(surface.flags() ^ Qt::FramelessWindowHint);

Now Q3DSurface is ready to receive data to be rendered. Create data elements to receive values:

QSurfaceDataArray *data = new QSurfaceDataArray;
QSurfaceDataRow *dataRow1 = new QSurfaceDataRow;
QSurfaceDataRow *dataRow2 = new QSurfaceDataRow;

First feed the data to the row elements and then add their pointers to the data element:

*dataRow1 << QVector3D(0.0f, 0.1f, 0.5f) << QVector3D(1.0f, 0.5f, 0.5f);
*dataRow2 << QVector3D(0.0f, 1.8f, 1.0f) << QVector3D(1.0f, 1.2f, 1.0f);
*data << dataRow1 << dataRow2;

Create a new series and set data to it:

QSurface3DSeries *series = new QSurface3DSeries;
series->dataProxy()->resetArray(data);
surface.addSeries(series);

Finally you will need to set it visible:

surface.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);

    Q3DSurface surface;
    surface.setFlags(surface.flags() ^ Qt::FramelessWindowHint);
    QSurfaceDataArray *data = new QSurfaceDataArray;
    QSurfaceDataRow *dataRow1 = new QSurfaceDataRow;
    QSurfaceDataRow *dataRow2 = new QSurfaceDataRow;

    *dataRow1 << QVector3D(0.0f, 0.1f, 0.5f) << QVector3D(1.0f, 0.5f, 0.5f);
    *dataRow2 << QVector3D(0.0f, 1.8f, 1.0f) << QVector3D(1.0f, 1.2f, 1.0f);
    *data << dataRow1 << dataRow2;

    QSurface3DSeries *series = new QSurface3DSeries;
    series->dataProxy()->resetArray(data);
    surface.addSeries(series);
    surface.show();

    return app.exec();
}

And this is what those few lines of code produce:

The scene can be rotated, zoomed into, and a surface point 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 Surface Example.

See also Q3DBars, Q3DScatter, Qt Data Visualization C++ Classes

This property holds the active x-axis.

Access functions:

• *axisX() const

• void setAxisX( *axis)

Notifier signal:

• void axisXChanged( *axis)

This property holds the active y-axis.

Access functions:

• *axisY() const

• void setAxisY( *axis)

Notifier signal:

• void axisYChanged( *axis)

This property holds the active z-axis.

Access functions:

• *axisZ() const

• void setAxisZ( *axis)

Notifier signal:

• void axisZChanged( *axis)

This property holds whether the horizontal axis grid is displayed on top of the graph rather than on the bottom.

In some use cases the horizontal axis grid is mostly covered by the surface, so it can be more useful to display the horizontal axis grid on top of the graph rather than on the bottom. A typical use case for this is showing 2D spectrograms using orthoGraphic projection with a top-down viewpoint.

If false, the horizontal axis grid and labels are drawn on the horizontal background of the graph. If true, the horizontal axis grid and labels are drawn on the opposite side of the graph from the horizontal background. Defaults to false.

This property was introduced in QtDataVisualization 1.2.

Access functions:

• bool flipHorizontalGrid() const

• void setFlipHorizontalGrid(bool flip)

Notifier signal:

• void flipHorizontalGridChanged(bool flip)

This property holds the selected series or null.

If selectionMode has SelectionMultiSeries set, this property holds the series which owns the selected point.

Access functions:

• *selectedSeries() const

Notifier signal:

• void selectedSeriesChanged( *series)

Constructs a new 3D surface graph with optional parent window and surface format.

Destroys the 3D surface graph.

Adds axis to the graph. The axes added via addAxis are not yet taken to use, addAxis is simply used to give the ownership of the axis to the graph. The axis must not be null or added to another graph.

See Also▲

Adds the series to the graph. A graph can contain multiple series, but has only one set of axes. If the newly added series has specified a selected item, it will be highlighted and any existing selection will be cleared. Only one added series can have an active selection.

See Also▲

Returns the list of all added axes.

See Also▲

Releases the ownership of the axis back to the caller, if it is added to this graph. If the released axis is in use, a new default axis will be created and set active.

If the default axis is released and added back later, it behaves as any other axis would.

See Also▲

Removes the series from the graph.

See Also▲

Returns the list of series added to this graph.

See Also▲

Sets axis as the active x-axis. Implicitly calls addAxis() to transfer the ownership of the axis to this graph.

If axis is null, a temporary default axis with no labels and an automatically adjusting range is created.

This temporary axis is destroyed if another axis is set explicitly to the same orientation.

See Also▲

Sets axis as the active y-axis. Implicitly calls addAxis() to transfer the ownership of the axis to this graph.

If axis is null, a temporary default axis with no labels and an automatically adjusting range is created.

This temporary axis is destroyed if another axis is set explicitly to the same orientation.

See Also▲

Sets axis as the active z-axis. Implicitly calls addAxis() to transfer the ownership of the axis to this graph.

If axis is null, a temporary default axis with no labels and an automatically adjusting range is created.

This temporary axis is destroyed if another axis is set explicitly to the same orientation.

See Also▲