QgsInterpolator Class Reference

Interface class for interpolations. More...

#include <qgsinterpolator.h>

Inheritance diagram for QgsInterpolator:

Classes
struct	LayerData
	A layer together with the information about interpolation attribute / z-coordinate interpolation and the type (point, structure line, breakline) More...

Public Types
enum	InputType { POINTS, STRUCTURE_LINES, BREAK_LINES }
	Describes the type of input data. More...

Public Member Functions
	QgsInterpolator (const QList< LayerData > &layerData)
virtual	~QgsInterpolator ()
virtual int	interpolatePoint (double x, double y, double &result)=0
	Calculates interpolation value for map coordinates x, y.

Protected Member Functions
int	cacheBaseData ()
	Caches the vertex and value data from the provider.

Protected Attributes
QVector< vertexData >	mCachedBaseData
bool	mDataIsCached
	Flag that tells if the cache already has been filled.
QList< LayerData >	mLayerData

Private Member Functions
	QgsInterpolator ()
int	addVerticesToCache (QgsGeometry *geom, bool zCoord, double attributeValue)
	Helper method that adds the vertices of a geometry to the mCachedBaseData.

Detailed Description

Interface class for interpolations.

Interpolators take the vertices of a vector layer as base data. The z-Value can be an attribute or the z-coordinates in case of 25D types

Definition at line 36 of file qgsinterpolator.h.

Member Enumeration Documentation

enum QgsInterpolator::InputType

Describes the type of input data.

Enumerator:

POINTS
STRUCTURE_LINES
BREAK_LINES

Definition at line 40 of file qgsinterpolator.h.

Constructor & Destructor Documentation

QgsInterpolator::QgsInterpolator

(

const QList< LayerData > &

layerData

)

Definition at line 23 of file qgsinterpolator.cpp.

QgsInterpolator::~QgsInterpolator ( )

virtual

Definition at line 33 of file qgsinterpolator.cpp.

QgsInterpolator::QgsInterpolator ( )

private

Definition at line 28 of file qgsinterpolator.cpp.

Member Function Documentation

int QgsInterpolator::addVerticesToCache ( QgsGeometry *  geom, bool  zCoord, double  attributeValue  )

private

Helper method that adds the vertices of a geometry to the mCachedBaseData.

Parameters

geom	the geometry
zCoord	true if the z-coordinate of the geometry is to be interpolated
attributeValue	the attribute value for interpolation (if not interpolated from z-coordinate)

Returns

0 in case of success

Definition at line 103 of file qgsinterpolator.cpp.

References QgsGeometry::asWkb(), index, mCachedBaseData, mDataIsCached, QGis::WKBLineString, QGis::WKBLineString25D, QGis::WKBMultiLineString, QGis::WKBMultiLineString25D, QGis::WKBMultiPoint, QGis::WKBMultiPoint25D, QGis::WKBMultiPolygon, QGis::WKBMultiPolygon25D, QGis::WKBPoint, QGis::WKBPoint25D, QGis::WKBPolygon, QGis::WKBPolygon25D, QgsGeometry::wkbType(), vertexData::x, vertexData::y, and vertexData::z.

Referenced by cacheBaseData().

int QgsInterpolator::cacheBaseData ( )

protected

Caches the vertex and value data from the provider.

All the vertex data will be held in virtual memory

Returns

0 in case of success

Definition at line 38 of file qgsinterpolator.cpp.

References addVerticesToCache(), QgsFeature::attribute(), QgsFeature::geometry(), QgsVectorLayer::getFeatures(), mCachedBaseData, mLayerData, and QgsFeatureIterator::nextFeature().

Referenced by QgsIDWInterpolator::interpolatePoint().

virtual int QgsInterpolator::interpolatePoint ( double  x, double  y, double &  result  )

pure virtual

Calculates interpolation value for map coordinates x, y.

Parameters

x	x-coordinate (in map units)
y	y-coordinate (in map units)
result	out: interpolation result

Returns

0 in case of success

Implemented in QgsTINInterpolator, and QgsIDWInterpolator.

Referenced by QgsGridFileWriter::writeFile().

Member Data Documentation

QVector<vertexData> QgsInterpolator::mCachedBaseData

protected

Definition at line 73 of file qgsinterpolator.h.

Referenced by addVerticesToCache(), cacheBaseData(), and QgsIDWInterpolator::interpolatePoint().

bool QgsInterpolator::mDataIsCached

protected

Flag that tells if the cache already has been filled.

Definition at line 76 of file qgsinterpolator.h.

Referenced by addVerticesToCache(), and QgsIDWInterpolator::interpolatePoint().

QList<LayerData> QgsInterpolator::mLayerData

protected

Definition at line 79 of file qgsinterpolator.h.

Referenced by cacheBaseData(), and QgsTINInterpolator::initialize().

---

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

• /tmp/buildd/qgis-2.2.0+wheezy1/src/analysis/interpolation/qgsinterpolator.h
• /tmp/buildd/qgis-2.2.0+wheezy1/src/analysis/interpolation/qgsinterpolator.cpp