An abstract base class for classes which transform geometries by transforming input points to output points. More...

#include <qgsgeometrytransformer.h>

Inheritance diagram for QgsAbstractGeometryTransformer:

Public Member Functions
virtual	~QgsAbstractGeometryTransformer ()=default

virtual bool	transformPoint (double &x, double &y, double &z, double &m)=0
	Transforms the point defined by the coordinates (x, y, z) and the specified m value.

Detailed Description

An abstract base class for classes which transform geometries by transforming input points to output points.

Since: QGIS 3.18

Definition at line 32 of file qgsgeometrytransformer.h.

Constructor & Destructor Documentation

◆ ~QgsAbstractGeometryTransformer()

virtual QgsAbstractGeometryTransformer::~QgsAbstractGeometryTransformer ( )

virtualdefault

Member Function Documentation

◆ transformPoint()

virtual bool QgsAbstractGeometryTransformer::transformPoint	(	double &	x,
		double &	y,
		double &	z,
		double &	m
	)

pure virtual

Transforms the point defined by the coordinates (x, y, z) and the specified m value.

Parameters

x	point x coordinate
y	point y coordinate
z	point z coordinate, or NaN if the input point is 2D only
m	point m value, or NaN if not available

Returns: true if point was transformed (or no transformation was required), or false if point could not be transformed successfully.

Example

A transformer which multiples the x coordinate by 3 and adds 10 to the y coordinate:

class MyTransformer(QgsAbstractGeometryTransformer):
 
  def transformPoint(self, x, y, z, m):
    # returns a tuple of True to indicate success, then the modified x/y/z/m values
    return True, x*3, y+10, z, m

Implemented in QgsGcpGeometryTransformer.

The documentation for this class was generated from the following file: