qgsmeshlayer.sip.in

/************************************************************************
 * This file has been generated automatically from                      *
 *                                                                      *
 * src/core/mesh/qgsmeshlayer.h                                         *
 *                                                                      *
 * Do not edit manually ! Edit header and run scripts/sipify.pl again   *
 ************************************************************************/






class QgsMeshLayer : QgsMapLayer
{
%Docstring

Represents a mesh layer supporting display of data on structured or unstructured meshes

The QgsMeshLayer is instantiated by specifying the name of a data provider,
such as mdal, and url defining the specific data set to connect to.
The vector layer constructor in turn instantiates a QgsMeshDataProvider subclass
corresponding to the provider type, and passes it the url. The data provider
connects to the data source.

The QgsMeshLayer provides a common interface to the different data types. It does not
yet support editing transactions.

The main data providers supported by QGIS are listed below.

Mesh data providers
-------------------

Memory data providerType (mesh_memory)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The memory data provider is used to construct in memory data, for example scratch
data. There is no inherent persistent storage of the data. The data source uri is constructed.
Data can be populated by setMesh(const QString &vertices, const QString &faces), where
vertices and faces is comma separated coordinates and connections for mesh.
E.g. to create mesh with one quad and one triangle

.. code-block::

      QString uri(
          "1.0, 2.0 \n" \
          "2.0, 2.0 \n" \
          "3.0, 2.0 \n" \
          "2.0, 3.0 \n" \
          "1.0, 3.0 \n" \
          "---"
          "0, 1, 3, 4 \n" \
          "1, 2, 3 \n"
        );
        QgsMeshLayer *scratchLayer = new QgsMeshLayer(uri, "My Scratch layer", "memory_mesh");

MDAL data provider (mdal)
~~~~~~~~~~~~~~~~~~~~~~~~~

Accesses data using the MDAL drivers (https://github.com/lutraconsulting/MDAL). The url
is the MDAL connection string. QGIS must be built with MDAL support to allow this provider.

.. code-block::

         QString uri = "test/land.2dm";
         QgsMeshLayer *scratchLayer = new QgsMeshLayer(uri, "My Scratch Layer",  "mdal");

.. note::

   The API is considered EXPERIMENTAL and can be changed without a notice


.. versionadded:: 3.2
%End

%TypeHeaderCode
#include "qgsmeshlayer.h"
%End
  public:

    struct LayerOptions
    {

      explicit LayerOptions( const QgsCoordinateTransformContext &transformContext = QgsCoordinateTransformContext( ) );
%Docstring
Constructor for LayerOptions with optional ``transformContext``.

.. note::

   transformContext argument was added in QGIS 3.8
%End

      QgsCoordinateTransformContext transformContext;

      bool skipCrsValidation;
    };

    explicit QgsMeshLayer( const QString &path = QString(), const QString &baseName = QString(), const QString &providerLib = QStringLiteral( "mesh_memory" ),
                           const QgsMeshLayer::LayerOptions &options = QgsMeshLayer::LayerOptions() );
%Docstring
Constructor - creates a mesh layer

The QgsMeshLayer is constructed by instantiating a data provider.  The provider
interprets the supplied path (url) of the data source to connect to and access the
data.

:param path: The path or url of the parameter.  Typically this encodes
             parameters used by the data provider as url query items.
:param baseName: The name used to represent the layer in the legend
:param providerLib: The name of the data provider, e.g., "mesh_memory", "mdal"
:param options: general mesh layer options
%End

    ~QgsMeshLayer();


    virtual QgsMeshDataProvider *dataProvider();

%Docstring
QgsMeshLayer cannot be copied.
%End
    virtual QgsMeshLayer *clone() const /Factory/;

    virtual QgsRectangle extent() const;

    virtual QgsMapLayerRenderer *createMapRenderer( QgsRenderContext &rendererContext ) /Factory/;

     virtual bool readSymbology( const QDomNode &node, QString &errorMessage,
                        QgsReadWriteContext &context, QgsMapLayer::StyleCategories categories = QgsMapLayer::AllStyleCategories );
     virtual bool writeSymbology( QDomNode &node, QDomDocument &doc, QString &errorMessage,
                         const QgsReadWriteContext &context, QgsMapLayer::StyleCategories categories = QgsMapLayer::AllStyleCategories ) const;
    virtual QString encodedSource( const QString &source, const QgsReadWriteContext &context ) const;

    virtual QString decodedSource( const QString &source, const QString &provider, const QgsReadWriteContext &context ) const;

    virtual bool readXml( const QDomNode &layer_node, QgsReadWriteContext &context );

    virtual bool writeXml( QDomNode &layer_node, QDomDocument &doc, const QgsReadWriteContext &context ) const;


    virtual void reload();


    QString providerType() const;
%Docstring
Returns the provider type for this layer
%End






    QgsMeshRendererSettings rendererSettings() const;
%Docstring
Returns renderer settings
%End
    void setRendererSettings( const QgsMeshRendererSettings &settings );
%Docstring
Sets new renderer settings
%End

    QgsMeshTimeSettings timeSettings() const;
%Docstring
Returns time format settings

.. versionadded:: 3.8
%End

    void setTimeSettings( const QgsMeshTimeSettings &settings );
%Docstring
Sets time format settings

.. versionadded:: 3.8
%End

    QString formatTime( double hours );
%Docstring
Returns (date) time in hours formatted to human readable form

:param hours: time in double in hours

:return: formatted time string

.. versionadded:: 3.8
%End

    QgsMeshDatasetValue datasetValue( const QgsMeshDatasetIndex &index, const QgsPointXY &point ) const;
%Docstring
Interpolates the value on the given point from given dataset.

.. note::

   It uses previously cached and indexed triangular mesh
   and so if the layer has not been rendered previously
   (e.g. when used in a script) it returns NaN value

:param index: dataset index specifying group and dataset to extract value from
:param point: point to query in map coordinates

:return: interpolated value at the point. Returns NaN values for values
         outside the mesh layer, nodata values and in case triangular mesh was not
         previously used for rendering


.. versionadded:: 3.4
%End

  public slots:

    virtual void setTransformContext( const QgsCoordinateTransformContext &transformContext );

%Docstring
Sets the coordinate transform context to ``transformContext``.

.. versionadded:: 3.8
%End


  signals:

    void activeScalarDatasetChanged( const QgsMeshDatasetIndex &index );
%Docstring
Emitted when active scalar dataset is changed

.. versionadded:: 3.4
%End

    void activeVectorDatasetChanged( const QgsMeshDatasetIndex &index );
%Docstring
Emitted when active vector dataset is changed

.. versionadded:: 3.4
%End

    void timeSettingsChanged( );
%Docstring
Emitted when time format is changed

.. versionadded:: 3.8
%End

  private: // Private methods
    QgsMeshLayer( const QgsMeshLayer &rhs );
};

/************************************************************************
 * This file has been generated automatically from                      *
 *                                                                      *
 * src/core/mesh/qgsmeshlayer.h                                         *
 *                                                                      *
 * Do not edit manually ! Edit header and run scripts/sipify.pl again   *
 ************************************************************************/