Contents

QItemModelScatterDataProxy Class

Proxy class for presenting data in item models with Q3DScatter. More...

Header: #include <QItemModelScatterDataProxy>
qmake: QT += datavisualization
Since: QtDataVisualization 1.0
Instantiated By: ItemModelScatterDataProxy
Inherits: QScatterDataProxy

This class was introduced in QtDataVisualization 1.0.

Properties

Public Functions

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

Signals

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

Detailed Description

QItemModelScatterDataProxy allows you to use QAbstractItemModel derived models as a data source for Q3DScatter. It maps roles of QAbstractItemModel to the XYZ-values of Q3DScatter 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 how the replace using regular expressions works, see QString::replace(const QRegExp &rx, const QString &after) function documentation. Note that using regular expressions has an impact on the 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 Qt Quick 2 Bars Example.

See also Qt Data Visualization Data Handling.

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 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 given values, and the second one will construct the quaternion using QQuaternion::fromAxisAndAngle() method.

Access functions:

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

Notifier signal:

void rotationRoleChanged(const QString &role)

rotationRolePattern : QRegExp

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:

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

Notifier signal:

void rotationRolePatternChanged(const QRegExp &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 QRegExp &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 : QRegExp

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:

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

Notifier signal:

void xPosRolePatternChanged(const QRegExp &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 QRegExp &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 : QRegExp

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:

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

Notifier signal:

void yPosRolePatternChanged(const QRegExp &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 QRegExp &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 : QRegExp

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:

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

Notifier signal:

void zPosRolePatternChanged(const QRegExp &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 QRegExp &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

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

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

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

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

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

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

QItemModelScatterDataProxy::QItemModelScatterDataProxy(QObject *parent = nullptr)

Constructs QItemModelScatterDataProxy with optional parent.

[virtual] 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 Q3DScatter. 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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