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Q3DScatter 类

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

头： #include <Q3DScatter>
qmake: QT += datavisualization
Since: QtDataVisualization 1.0
继承： QAbstract3DGraph

该类在 QtDataVisualization 1.0 引入。

特性

公共函数

Q3DScatter (const QSurfaceFormat * format = nullptr, QWindow * parent = nullptr)
virtual ~Q3DScatter ()
void addAxis (QValue3DAxis * axis )
void addSeries (QScatter3DSeries * series )
QList<QValue3DAxis *> axes () const
QValue3DAxis * axisX () const
QValue3DAxis * axisY () const
QValue3DAxis * axisZ () const
void releaseAxis (QValue3DAxis * axis )
void removeSeries (QScatter3DSeries * series )
QScatter3DSeries * selectedSeries () const
QList<QScatter3DSeries *> seriesList () const
void setAxisX (QValue3DAxis * axis )
void setAxisY (QValue3DAxis * axis )
void setAxisZ (QValue3DAxis * axis )

信号

void axisXChanged (QValue3DAxis * axis )
void axisYChanged (QValue3DAxis * axis )
void axisZChanged (QValue3DAxis * axis )
void selectedSeriesChanged (QScatter3DSeries * series )

详细描述

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.

如何构造最小 Q3DScatter 图形

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>
using namespace QtDataVisualization;
int main(int argc, char **argv)
{
    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 Example .

另请参阅 Q3DBars , Q3DSurface ，和 Qt Data Visualization C++ 类 .

特性文档编制

axisX : QValue3DAxis *

This property holds the active x-axis.

访问函数：

QValue3DAxis * axisX () const
void setAxisX (QValue3DAxis * axis )

通知程序信号：

void axisXChanged (QValue3DAxis * axis )

axisY : QValue3DAxis *

This property holds the active y-axis.

访问函数：

QValue3DAxis * axisY () const
void setAxisY (QValue3DAxis * axis )

通知程序信号：

void axisYChanged (QValue3DAxis * axis )

axisZ : QValue3DAxis *

This property holds the active z-axis.

访问函数：

QValue3DAxis * axisZ () const
void setAxisZ (QValue3DAxis * axis )

通知程序信号：

void axisZChanged (QValue3DAxis * axis )

selectedSeries : QScatter3DSeries * const

This property holds the selected series or null.

访问函数：

QScatter3DSeries * selectedSeries () const

通知程序信号：

void selectedSeriesChanged (QScatter3DSeries * series )

成员函数文档编制

Q3DScatter:: Q3DScatter (const QSurfaceFormat * format = nullptr, QWindow * parent = nullptr)

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

[虚拟] Q3DScatter:: ~Q3DScatter ()

Destroys the 3D scatter graph.

void Q3DScatter:: addAxis ( QValue3DAxis * axis )

添加 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.

另请参阅 releaseAxis (), setAxisX (), setAxisY ()，和 setAxisZ ().

void Q3DScatter:: addSeries ( QScatter3DSeries * series )

添加 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.

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

Returns the list of all added axes.

另请参阅 addAxis ().

QValue3DAxis *Q3DScatter:: axisZ () const

Returns the used z-axis.

注意： Getter function for property axisZ.

另请参阅 setAxisZ ().

void Q3DScatter:: releaseAxis ( QValue3DAxis * axis )

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.

另请参阅 addAxis (), setAxisX (), setAxisY ()，和 setAxisZ ().

void Q3DScatter:: removeSeries ( QScatter3DSeries * series )

移除 series from the graph.

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

Returns the list of series added to this graph.

void Q3DScatter:: setAxisX ( QValue3DAxis * axis )

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

若 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.

注意： setter 函数对于特性 axisX .

另请参阅 axisX (), addAxis ()，和 releaseAxis ().

void Q3DScatter:: setAxisY ( QValue3DAxis * axis )

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

若 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.

注意： setter 函数对于特性 axisY .

另请参阅 axisY (), addAxis ()，和 releaseAxis ().

void Q3DScatter:: setAxisZ ( QValue3DAxis * axis )

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

若 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.

注意： setter 函数对于特性 axisZ .

另请参阅 axisZ (), addAxis ()，和 releaseAxis ().

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