QItemModelScatterDataProxy Class

Proxy class for presenting data in item models with Q3DScatterWidgetItem. More...

Header: #include <QItemModelScatterDataProxy>
CMake: find_package(Qt6 REQUIRED COMPONENTS Graphs)
target_link_libraries(mytarget PRIVATE Qt6::Graphs)
qmake: QT += graphs
In QML: ItemModelScatterDataProxy
Inherits: QScatterDataProxy

Properties

Public Functions

QItemModelScatterDataProxy(QObject *parent = nullptr)
QItemModelScatterDataProxy(QAbstractItemModel *itemModel, QObject *parent = nullptr)
QItemModelScatterDataProxy(QAbstractItemModel *itemModel, const QString &xPosRole, const QString &yPosRole, const QString &zPosRole, QObject *parent = nullptr)
QItemModelScatterDataProxy(QAbstractItemModel *itemModel, const QString &xPosRole, const QString &yPosRole, const QString &zPosRole, const QString &rotationRole, QObject *parent = nullptr)
virtual ~QItemModelScatterDataProxy() override
QAbstractItemModel *itemModel() const
void remap(const QString &xPosRole, const QString &yPosRole, const QString &zPosRole, const QString &rotationRole)
QString rotationRole() const
QRegularExpression rotationRolePattern() const
QString rotationRoleReplace() const
void setItemModel(QAbstractItemModel *itemModel)
void setRotationRole(const QString &role)
void setRotationRolePattern(const QRegularExpression &pattern)
void setRotationRoleReplace(const QString &replace)
void setXPosRole(const QString &role)
void setXPosRolePattern(const QRegularExpression &pattern)
void setXPosRoleReplace(const QString &replace)
void setYPosRole(const QString &role)
void setYPosRolePattern(const QRegularExpression &pattern)
void setYPosRoleReplace(const QString &replace)
void setZPosRole(const QString &role)
void setZPosRolePattern(const QRegularExpression &pattern)
void setZPosRoleReplace(const QString &replace)
QString xPosRole() const
QRegularExpression xPosRolePattern() const
QString xPosRoleReplace() const
QString yPosRole() const
QRegularExpression yPosRolePattern() const
QString yPosRoleReplace() const
QString zPosRole() const
QRegularExpression zPosRolePattern() const
QString zPosRoleReplace() const

Signals

void itemModelChanged(const QAbstractItemModel *itemModel)
void rotationRoleChanged(const QString &role)
void rotationRolePatternChanged(const QRegularExpression &pattern)
void rotationRoleReplaceChanged(const QString &replace)
void xPosRoleChanged(const QString &role)
void xPosRolePatternChanged(const QRegularExpression &pattern)
void xPosRoleReplaceChanged(const QString &replace)
void yPosRoleChanged(const QString &role)
void yPosRolePatternChanged(const QRegularExpression &pattern)
void yPosRoleReplaceChanged(const QString &replace)
void zPosRoleChanged(const QString &role)
void zPosRolePatternChanged(const QRegularExpression &pattern)
void zPosRoleReplaceChanged(const QString &replace)

Detailed Description

QItemModelScatterDataProxy allows you to use QAbstractItemModel derived models as a data source for Q3DScatterWidgetItem. It maps roles of QAbstractItemModel to the XYZ-values of Q3DScatterWidgetItem points.

The data is resolved asynchronously whenever the mapping or the model changes. QScatterDataProxy::arrayReset() is emitted when the data has been resolved. However, inserts, removes, and single data item changes after the model initialization are resolved synchronously, unless the same frame also contains a change that causes the whole model to be resolved.

Mapping ignores rows and columns of the QAbstractItemModel and treats all items equally. It requires the model to provide roles for the data items that can be mapped to X, Y, and Z-values for the scatter points.

For example, assume that you have a custom QAbstractItemModel for storing various measurements done on material samples, providing data for roles such as "density", "hardness", and "conductivity". You could visualize these properties on a scatter graph using this proxy:

// Map "density" value to X-axis, "hardness" to Y-axis and "conductivity" to Z-axis.
QItemModelScatterDataProxy *proxy = new QItemModelScatterDataProxy(customModel,
                                                                   QStringLiteral("density"),
                                                                   QStringLiteral("hardness"),
                                                                   QStringLiteral("conductivity"));

If the fields of the model do not contain the data in the exact format you need, you can specify a search pattern regular expression and a replace rule for each role to get the value in a format you need. For more information on how the replacement using regular expressions works, see the QString::replace(const QRegularExpression &rx, const QString &after) function documentation. Note that using regular expressions has an impact on performance, so it's more efficient to utilize item models where doing search and replace is not necessary to get the desired values.

For example about using the search patterns in conjunction with the roles, see ItemModelBarDataProxy usage in Simple Bar Graph.

See also Qt Graphs Data Handling with 3D.

Property Documentation

itemModel : QAbstractItemModel*

This property holds the item model to use as a data source for a 3D scatter series.

Access functions:

QAbstractItemModel *itemModel() const
void setItemModel(QAbstractItemModel *itemModel)

Notifier signal:

void itemModelChanged(const QAbstractItemModel *itemModel)

rotationRole : QString

This property holds the item model role to map into item rotation.

The model may supply the value for rotation as either a variant that is directly convertible to QQuaternion or as one of the string representations: "scalar,x,y,z" or "@angle,x,y,z". The first will construct the quaternion directly with the given values, and the second one will construct the quaternion using the QQuaternion::fromAxisAndAngle() method.

Access functions:

QString rotationRole() const
void setRotationRole(const QString &role)

Notifier signal:

void rotationRoleChanged(const QString &role)

rotationRolePattern : QRegularExpression

This property holds whether a search and replace is done on the value mapped by the rotation role before it is used as item rotation.

This property specifies the regular expression to find the portion of the mapped value to replace and rotationRoleReplace property contains the replacement string.

Access functions:

QRegularExpression rotationRolePattern() const
void setRotationRolePattern(const QRegularExpression &pattern)

Notifier signal:

void rotationRolePatternChanged(const QRegularExpression &pattern)

See also rotationRole and rotationRoleReplace.

rotationRoleReplace : QString

This property holds the replace content to be used in conjunction with the rotation role pattern.

Defaults to an empty string. For more information on how the search and replace using regular expressions works, see QString::replace(const QRegularExpression &rx, const QString &after) function documentation.

Access functions:

QString rotationRoleReplace() const
void setRotationRoleReplace(const QString &replace)

Notifier signal:

void rotationRoleReplaceChanged(const QString &replace)

See also rotationRole and rotationRolePattern.

xPosRole : QString

This property holds the item model role to map into the X position.

Access functions:

QString xPosRole() const
void setXPosRole(const QString &role)

Notifier signal:

void xPosRoleChanged(const QString &role)

xPosRolePattern : QRegularExpression

This property holds whether search and replace is done on the value mapped by the x position role before it is used as an item position value.

This property specifies the regular expression to find the portion of the mapped value to replace and xPosRoleReplace property contains the replacement string.

Access functions:

QRegularExpression xPosRolePattern() const
void setXPosRolePattern(const QRegularExpression &pattern)

Notifier signal:

void xPosRolePatternChanged(const QRegularExpression &pattern)

See also xPosRole and xPosRoleReplace.

xPosRoleReplace : QString

This property holds the replace content to be used in conjunction with the x position role pattern.

Defaults to an empty string. For more information on how the search and replace using regular expressions works, see QString::replace(const QRegularExpression &rx, const QString &after) function documentation.

Access functions:

QString xPosRoleReplace() const
void setXPosRoleReplace(const QString &replace)

Notifier signal:

void xPosRoleReplaceChanged(const QString &replace)

See also xPosRole and xPosRolePattern.

yPosRole : QString

This property holds the item model role to map into the Y position.

Access functions:

QString yPosRole() const
void setYPosRole(const QString &role)

Notifier signal:

void yPosRoleChanged(const QString &role)

yPosRolePattern : QRegularExpression

This property holds whether a search and replace is done on the value mapped by the y position role before it is used as an item position value.

This property specifies the regular expression to find the portion of the mapped value to replace and yPosRoleReplace property contains the replacement string.

Access functions:

QRegularExpression yPosRolePattern() const
void setYPosRolePattern(const QRegularExpression &pattern)

Notifier signal:

void yPosRolePatternChanged(const QRegularExpression &pattern)

See also yPosRole and yPosRoleReplace.

yPosRoleReplace : QString

This property holds the replace content to be used in conjunction with the y position role pattern.

Defaults to an empty string. For more information on how the search and replace using regular expressions works, see QString::replace(const QRegularExpression &rx, const QString &after) function documentation.

Access functions:

QString yPosRoleReplace() const
void setYPosRoleReplace(const QString &replace)

Notifier signal:

void yPosRoleReplaceChanged(const QString &replace)

See also yPosRole and yPosRolePattern.

zPosRole : QString

This property holds the item model role to map into the Z position.

Access functions:

QString zPosRole() const
void setZPosRole(const QString &role)

Notifier signal:

void zPosRoleChanged(const QString &role)

zPosRolePattern : QRegularExpression

This property holds whether a search and replace is done on the value mapped by the z position role before it is used as an item position value.

This property specifies the regular expression to find the portion of the mapped value to replace and zPosRoleReplace property contains the replacement string.

Access functions:

QRegularExpression zPosRolePattern() const
void setZPosRolePattern(const QRegularExpression &pattern)

Notifier signal:

void zPosRolePatternChanged(const QRegularExpression &pattern)

See also zPosRole and zPosRoleReplace.

zPosRoleReplace : QString

This property holds the replace content to be used in conjunction with the z position role pattern.

Defaults to an empty string. For more information on how the search and replace using regular expressions works, see QString::replace(const QRegularExpression &rx, const QString &after) function documentation.

Access functions:

QString zPosRoleReplace() const
void setZPosRoleReplace(const QString &replace)

Notifier signal:

void zPosRoleReplaceChanged(const QString &replace)

See also zPosRole and zPosRolePattern.

Member Function Documentation

[explicit] QItemModelScatterDataProxy::QItemModelScatterDataProxy(QObject *parent = nullptr)

Constructs QItemModelScatterDataProxy with optional parent.

[explicit] QItemModelScatterDataProxy::QItemModelScatterDataProxy(QAbstractItemModel *itemModel, QObject *parent = nullptr)

Constructs QItemModelScatterDataProxy with itemModel and an optional parent. Proxy doesn't take ownership of the itemModel, as typically item models are owned by other controls.

[explicit] QItemModelScatterDataProxy::QItemModelScatterDataProxy(QAbstractItemModel *itemModel, const QString &xPosRole, const QString &yPosRole, const QString &zPosRole, QObject *parent = nullptr)

Constructs QItemModelScatterDataProxy with itemModel and an optional parent. The proxy doesn't take ownership of the itemModel, as item models are typically owned by other controls. The xPosRole property is set to xPosRole, the yPosRole property to yPosRole, and the zPosRole property to zPosRole.

[explicit] QItemModelScatterDataProxy::QItemModelScatterDataProxy(QAbstractItemModel *itemModel, const QString &xPosRole, const QString &yPosRole, const QString &zPosRole, const QString &rotationRole, QObject *parent = nullptr)

Constructs QItemModelScatterDataProxy with itemModel and an optional parent. The proxy doesn't take ownership of the itemModel, as item models are typically owned by other controls. The xPosRole property is set to xPosRole, the yPosRole property to yPosRole, the zPosRole property to zPosRole, and the rotationRole property to rotationRole.

[override virtual noexcept] QItemModelScatterDataProxy::~QItemModelScatterDataProxy()

Destroys QItemModelScatterDataProxy.

void QItemModelScatterDataProxy::remap(const QString &xPosRole, const QString &yPosRole, const QString &zPosRole, const QString &rotationRole)

Changes xPosRole, yPosRole, zPosRole, and rotationRole mapping.

void QItemModelScatterDataProxy::setItemModel(QAbstractItemModel *itemModel)

Sets itemModel as the item model for Q3DScatterWidgetItem. Does not take ownership of the model, but does connect to it to listen for changes.

Note: Setter function for property itemModel.

See also itemModel().

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