Q3DScatterWidgetItem Class

Detailed Description

This class enables developers to render 3D scatter graphs and view them by freely rotating the scene. Rotation is achieved by holding down the right mouse button and moving the mouse, while zooming is accomplished using the mouse wheel. If enabled, selection is performed with the left mouse button. The scene can be reset to the default camera view by clicking the mouse wheel. On touch devices, rotation is achieved by tap-and-move, selection by tap-and-hold, and zooming by pinch.

If no axes are set explicitly to Q3DScatterWidgetItem, 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.

Q3DScatterWidgetItem supports more than one series visible at the same time.

Q3DScatterWidgetItem has transparency support. This feature allows you to adjust the opacity of the scatter points, making them partially see-through, fully transparent, or opaque.

How to construct a minimal Q3DScatterWidgetItem graph

First, construct Q3DScatterWidgetItem. Since we are running the graph as the top-level window in this example, we need to clear the Qt::FramelessWindowHint flag, which is set by default:

 QQuickWidget quickWidget;
 Q3DScatterWidgetItem scatter;
 scatter.setWidget(&quickWidget);
 scatter.widget()->setMinimumSize(QSize(256, 256));

Now Q3DScatterWidgetItem is ready to receive data to be rendered. Add one series of 3 QVector3D items:

 QScatter3DSeries series;
 QScatterDataArray data;
 data << QScatterDataItem(0.5f, 0.5f, 0.5f) << QScatterDataItem(-0.3f, -0.5f, -0.4f)
      << QScatterDataItem(0.0f, -0.3f, 0.2f);
 series.dataProxy()->addItems(data);
 scatter.addSeries(&series);

Finally you will need to set it visible:

 scatter.widget()->show();

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

 #include <QtGraphs>
 #include <QtGraphsWidgets/q3dscatterwidgetitem.h>
 #include <QtWidgets/qapplication.h>

 int main(int argc, char **argv)
 {
     QApplication app(argc, argv);

     QQuickWidget quickWidget;
     Q3DScatterWidgetItem scatter;
     scatter.setWidget(&quickWidget);
     scatter.widget()->setMinimumSize(QSize(256, 256));
     QScatter3DSeries series;
     QScatterDataArray data;
     data << QScatterDataItem(0.5f, 0.5f, 0.5f) << QScatterDataItem(-0.3f, -0.5f, -0.4f)
          << QScatterDataItem(0.0f, -0.3f, 0.2f);
     series.dataProxy()->addItems(data);
     scatter.addSeries(&series);
     scatter.widget()->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 interactions are included in this minimal code example. You can learn more by familiarizing yourself with the examples provided, like the Simple Scatter Graph.