QGIS/python/core/auto_generated/qgsdistancearea.sip.in

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




class QgsDistanceArea
{
%Docstring
A general purpose distance and area calculator, capable of performing ellipsoid based calculations.

Measurements can either be performed on existing QgsGeometry objects, or using
lists of points.

If a valid ellipsoid() has been set for the QgsDistanceArea, all calculations will be
performed using ellipsoidal algorithms (e.g. using Vincenty's formulas). If no
ellipsoid has been set, all calculations will be performed using Cartesian
formulas only. The behavior can be determined by calling willUseEllipsoid().

In order to perform accurate calculations, the source coordinate reference system
of all measured geometries must first be specified using setSourceCrs().

Usually, the measurements returned by QgsDistanceArea are in meters. If no valid
ellipsoid is set, then the units may not be meters. The units can be retrieved
by calling lengthUnits() and areaUnits().
%End

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

    QgsDistanceArea();
%Docstring
Constructor
%End

    bool willUseEllipsoid() const;
%Docstring
Returns whether calculations will use the ellipsoid. Calculations will only use the
ellipsoid if a valid ellipsoid() has been set.

.. seealso:: :py:func:`ellipsoid`

.. versionadded:: 2.14
%End

    void setSourceCrs( const QgsCoordinateReferenceSystem &crs, const QgsCoordinateTransformContext &context );
%Docstring
Sets source spatial reference system ``crs``.

.. seealso:: :py:func:`sourceCrs`

.. versionadded:: 2.2
%End

    QgsCoordinateReferenceSystem sourceCrs() const;
%Docstring
Returns the source spatial reference system.

.. seealso:: :py:func:`setSourceCrs`

.. seealso:: :py:func:`ellipsoidCrs`
%End

    QgsCoordinateReferenceSystem ellipsoidCrs() const;
%Docstring
Returns the ellipsoid (destination) spatial reference system.

.. seealso:: :py:func:`sourceCrs`

.. seealso:: :py:func:`ellipsoid`

.. versionadded:: 3.6
%End

    bool setEllipsoid( const QString &ellipsoid );
%Docstring
Sets the ``ellipsoid`` by its acronym. Known ellipsoid acronyms can be
retrieved using :py:func:`QgsEllipsoidUtils.acronyms()`
Calculations will only use the ellipsoid if a valid ellipsoid has been set.

:return: ``True`` if ellipsoid was successfully set

.. seealso:: :py:func:`ellipsoid`

.. seealso:: :py:func:`willUseEllipsoid`
%End

    bool setEllipsoid( double semiMajor, double semiMinor );
%Docstring
Sets ellipsoid by supplied radii. Calculations will only use the ellipsoid if
a valid ellipsoid been set.

:return: ``True`` if ellipsoid was successfully set

.. seealso:: :py:func:`ellipsoid`

.. seealso:: :py:func:`willUseEllipsoid`
%End

    QString ellipsoid() const;
%Docstring
Returns ellipsoid's acronym. Calculations will only use the
ellipsoid if a valid ellipsoid has been set.

.. seealso:: :py:func:`setEllipsoid`

.. seealso:: :py:func:`willUseEllipsoid`

.. seealso:: :py:func:`ellipsoidCrs`
%End

    double ellipsoidSemiMajor() const;
%Docstring
Returns the ellipsoid's semi major axis.

.. seealso:: :py:func:`ellipsoid`

.. seealso:: :py:func:`ellipsoidSemiMinor`

.. seealso:: :py:func:`ellipsoidInverseFlattening`
%End

    double ellipsoidSemiMinor() const;
%Docstring
Returns ellipsoid's semi minor axis.

.. seealso:: :py:func:`ellipsoid`

.. seealso:: :py:func:`ellipsoidSemiMajor`

.. seealso:: :py:func:`ellipsoidInverseFlattening`
%End

    double ellipsoidInverseFlattening() const;
%Docstring
Returns ellipsoid's inverse flattening.
The inverse flattening is calculated with invf = a/(a-b).

.. seealso:: :py:func:`ellipsoid`

.. seealso:: :py:func:`ellipsoidSemiMajor`

.. seealso:: :py:func:`ellipsoidSemiMinor`
%End

    double measureArea( const QgsGeometry &geometry ) const;
%Docstring
Measures the area of a geometry.

:param geometry: geometry to measure

:return: area of geometry. For geometry collections, non surface geometries will be ignored. The units for the
         returned area can be retrieved by calling areaUnits().

.. seealso:: :py:func:`measureLength`

.. seealso:: :py:func:`measurePerimeter`

.. seealso:: :py:func:`areaUnits`

.. versionadded:: 2.12
%End

    double measureLength( const QgsGeometry &geometry ) const;
%Docstring
Measures the length of a geometry.

:param geometry: geometry to measure

:return: length of geometry. For geometry collections, non curve geometries will be ignored. The units for the
         returned distance can be retrieved by calling lengthUnits().

.. seealso:: :py:func:`lengthUnits`

.. seealso:: :py:func:`measureArea`

.. seealso:: :py:func:`measurePerimeter`

.. versionadded:: 2.12
%End

    double measurePerimeter( const QgsGeometry &geometry ) const;
%Docstring
Measures the perimeter of a polygon geometry.

:param geometry: geometry to measure

:return: perimeter of geometry. For geometry collections, any non-polygon geometries will be ignored. The units for the
         returned perimeter can be retrieved by calling lengthUnits().

.. seealso:: :py:func:`lengthUnits`

.. seealso:: :py:func:`measureArea`

.. seealso:: :py:func:`measurePerimeter`

.. versionadded:: 2.12
%End

    double measureLine( const QVector<QgsPointXY> &points ) const;
%Docstring
Measures the length of a line with multiple segments.

:param points: list of points in line

:return: length of line. The units for the returned length can be retrieved by calling lengthUnits().

.. seealso:: :py:func:`lengthUnits`
%End

    double measureLine( const QgsPointXY &p1, const QgsPointXY &p2 ) const;
%Docstring
Measures the distance between two points.

:param p1: start of line
:param p2: end of line

:return: distance between points. The units for the returned distance can be retrieved by calling lengthUnits().

.. seealso:: :py:func:`lengthUnits`
%End

    double measureLineProjected( const QgsPointXY &p1, double distance = 1, double azimuth = M_PI_2, QgsPointXY *projectedPoint /Out/ = 0 ) const;
%Docstring
Calculates the distance from one point with distance in meters and azimuth (direction)
When the sourceCrs() is geographic, computeSpheroidProject() will be called
otherwise QgsPoint.project() will be called after QgsUnitTypes.fromUnitToUnitFactor() has been applied to the distance

:param p1: start point [can be Cartesian or Geographic]
:param distance: must be in meters
:param azimuth: - azimuth in radians, clockwise from North

:return: - distance in mapUnits
         - projectedPoint: calculated projected point

.. seealso:: :py:func:`sourceCrs`

.. seealso:: :py:func:`computeSpheroidProject`

.. note::

   The input Point must be in the coordinate reference system being used

.. versionadded:: 3.0
%End

    QgsUnitTypes::DistanceUnit lengthUnits() const;
%Docstring
Returns the units of distance for length calculations made by this object.

.. seealso:: :py:func:`areaUnits`

.. versionadded:: 2.14
%End

    QgsUnitTypes::AreaUnit areaUnits() const;
%Docstring
Returns the units of area for areal calculations made by this object.

.. seealso:: :py:func:`lengthUnits`

.. versionadded:: 2.14
%End

    double measurePolygon( const QVector<QgsPointXY> &points ) const;
%Docstring
Measures the area of the polygon described by a set of points.
%End

    double bearing( const QgsPointXY &p1, const QgsPointXY &p2 ) const;
%Docstring
Computes the bearing (in radians) between two points.
%End

    static QString formatDistance( double distance, int decimals, QgsUnitTypes::DistanceUnit unit, bool keepBaseUnit = false );
%Docstring
Returns an distance formatted as a friendly string.

:param distance: distance to format
:param decimals: number of decimal places to show
:param unit: unit of distance
:param keepBaseUnit: set to ``False`` to allow conversion of large distances to more suitable units, e.g., meters to
                     kilometers

:return: formatted distance string

.. seealso:: :py:func:`formatArea`

.. versionadded:: 2.16
%End

    static QString formatArea( double area, int decimals, QgsUnitTypes::AreaUnit unit, bool keepBaseUnit = false );
%Docstring
Returns an area formatted as a friendly string.

:param area: area to format
:param decimals: number of decimal places to show
:param unit: unit of area
:param keepBaseUnit: set to ``False`` to allow conversion of large areas to more suitable units, e.g., square meters to
                     square kilometers

:return: formatted area string

.. seealso:: :py:func:`formatDistance`

.. versionadded:: 2.14
%End

    double convertLengthMeasurement( double length, QgsUnitTypes::DistanceUnit toUnits ) const;
%Docstring
Takes a length measurement calculated by this QgsDistanceArea object and converts it to a
different distance unit.

:param length: length value calculated by this class to convert. It is assumed that the length
               was calculated by this class, ie that its unit of length is equal to lengthUnits().
:param toUnits: distance unit to convert measurement to

:return: converted distance

.. seealso:: :py:func:`convertAreaMeasurement`

.. versionadded:: 2.14
%End

    double convertAreaMeasurement( double area, QgsUnitTypes::AreaUnit toUnits ) const;
%Docstring
Takes an area measurement calculated by this QgsDistanceArea object and converts it to a
different areal unit.

:param area: area value calculated by this class to convert. It is assumed that the area
             was calculated by this class, ie that its unit of area is equal to areaUnits().
:param toUnits: area unit to convert measurement to

:return: converted area

.. seealso:: :py:func:`convertLengthMeasurement`

.. versionadded:: 2.14
%End

    QgsPointXY computeSpheroidProject( const QgsPointXY &p1, double distance = 1, double azimuth = M_PI_2 ) const;
%Docstring
Given a location, an azimuth and a distance, computes the
location of the projected point. Based on Vincenty's formula
for the geodetic direct problem as described in "Geocentric
Datum of Australia Technical Manual", Chapter 4.

:param p1: - location of first geographic (latitude/longitude) point as degrees.
:param distance: - distance in meters.
:param azimuth: - azimuth in radians, clockwise from North

:return: p2 - location of projected point as longitude/latitude.

.. note::

   code (and documentation) taken from rttopo project
   https://git.osgeo.org/gogs/rttopo/librttopo
   - spheroid_project.spheroid_project(...)
   -  Valid bounds checking for degrees (latitude=+- 85.05115) is based values used for
   -> 'WGS84 Web Mercator (Auxiliary Sphere)' calculations
   --> latitudes outside these bounds cause the calculations to become unstable and can return invalid results

.. versionadded:: 3.0
%End

    QVector<QVector<QgsPointXY> > geodesicLine( const QgsPointXY &p1, const QgsPointXY &p2, double interval, bool breakLine = false ) const;
%Docstring
Calculates the geodesic line between ``p1`` and ``p2``, which represents the shortest path on the
ellipsoid between these two points.

The ellipsoid settings defined on this QgsDistanceArea object will be used during the calculations.

``p1`` and ``p2`` must be in the sourceCrs() of this QgsDistanceArea object. The returned line
will also be in this same CRS.

The ``interval`` parameter gives the maximum distance between points on the computed line.
This argument is always specified in meters. A shorter distance results in a denser line,
at the cost of extra computing time.

If the geodesic line crosses the antimeridian (+/- 180 degrees longitude) and ``breakLine`` is ``True``, then
the line will be split into two parts, broken at the antimeridian. In this case the function
will return two lines, corresponding to the portions at either side of the antimeridian.

.. versionadded:: 3.6
%End

    double latitudeGeodesicCrossesAntimeridian( const QgsPointXY &p1, const QgsPointXY &p2, double &fractionAlongLine /Out/ ) const;
%Docstring
Calculates the latitude at which the geodesic line joining ``p1`` and ``p2`` crosses
the antimeridian (longitude +/- 180 degrees).

The ellipsoid settings defined on this QgsDistanceArea object will be used during the calculations.

``p1`` and ``p2`` must be in the ellipsoidCrs() of this QgsDistanceArea object. The returned latitude
will also be in this same CRS.

:param p1: Starting point, in ellipsoidCrs()
:param p2: Ending point, in ellipsoidCrs()

:return: - the latitude at which the geodesic crosses the antimeridian
         - fractionAlongLine: will be set to the fraction along the geodesic line joining ``p1`` to ``p2`` at which the antimeridian crossing occurs.

.. seealso:: :py:func:`splitGeometryAtAntimeridian`


.. versionadded:: 3.6
%End

    QgsGeometry splitGeometryAtAntimeridian( const QgsGeometry &geometry ) const;
%Docstring
Splits a (Multi)LineString ``geometry`` at the antimeridian (longitude +/- 180 degrees).
The returned geometry will always be a multi-part geometry.

Whenever line segments in the input geometry cross the antimeridian, they will be
split into two segments, with the latitude of the breakpoint being determined using a geodesic
line connecting the points either side of this segment.

The ellipsoid settings defined on this QgsDistanceArea object will be used during the calculations.

``geometry`` must be in the sourceCrs() of this QgsDistanceArea object. The returned geometry
will also be in this same CRS.

If ``geometry`` contains M or Z values, these will be linearly interpolated for the new vertices
created at the antimeridian.

.. note::

   Non-(Multi)LineString geometries will be returned unchanged.

.. seealso:: :py:func:`latitudeGeodesicCrossesAntimeridian`

.. versionadded:: 3.6
%End

};


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