QgsPointSample Class Reference

Creates random points in polygons / multipolygons. More...

#include <qgspointsample.h>

Collaboration diagram for QgsPointSample:

Public Member Functions
	QgsPointSample (QgsVectorLayer *inputLayer, const QString &outputLayer, QString nPointsAttribute, QString minDistAttribute=QString())
	~QgsPointSample ()
int	createRandomPoints (QProgressDialog *pd)
	Starts calculation of random points.

Private Member Functions
	QgsPointSample ()
void	addSamplePoints (QgsFeature &inputFeature, QgsVectorFileWriter &writer, int nPoints, double minDistance)
bool	checkMinDistance (QgsPoint &pt, QgsSpatialIndex &index, double minDistance, QMap< QgsFeatureId, QgsPoint > &pointMap)

Private Attributes
QgsVectorLayer *	mInputLayer
	Layer id of input polygon/multipolygon layer.
QString	mOutputLayer
	Output path of result layer.
QString	mNumberOfPointsAttribute
	Attribute containing number of points per feature.
QString	mMinDistanceAttribute
	Attribute containing minimum distance between sample points (or -1 if no min.
QgsFeatureId	mNCreatedPoints

Detailed Description

Creates random points in polygons / multipolygons.

Definition at line 15 of file qgspointsample.h.

Constructor & Destructor Documentation

QgsPointSample::QgsPointSample	(	QgsVectorLayer *	inputLayer,
		const QString &	outputLayer,
		QString	nPointsAttribute,
		QString	minDistAttribute = QString()
	)

Definition at line 10 of file qgspointsample.cpp.

QgsPointSample::~QgsPointSample

(

)

Definition at line 19 of file qgspointsample.cpp.

QgsPointSample::QgsPointSample ( )

private

Definition at line 15 of file qgspointsample.cpp.

Member Function Documentation

void QgsPointSample::addSamplePoints ( QgsFeature &  inputFeature, QgsVectorFileWriter &  writer, int  nPoints, double  minDistance  )

private

Definition at line 82 of file qgspointsample.cpp.

References QgsVectorFileWriter::addFeature(), QgsGeometry::boundingBox(), checkMinDistance(), QgsGeometry::fromPoint(), QgsFeature::geometry(), QgsRectangle::height(), QgsFeature::id(), QgsSpatialIndex::insertFeature(), QgsRectangle::isEmpty(), MD_RAND_MAX, mNCreatedPoints, mt_rand(), QgsFeature::setAttribute(), QgsFeature::setGeometry(), QgsRectangle::width(), QgsGeometry::within(), QgsRectangle::xMinimum(), and QgsRectangle::yMinimum().

Referenced by createRandomPoints().

bool QgsPointSample::checkMinDistance ( QgsPoint &  pt, QgsSpatialIndex &  index, double  minDistance, QMap< QgsFeatureId, QgsPoint > &  pointMap  )

private

Definition at line 134 of file qgspointsample.cpp.

References QgsSpatialIndex::nearestNeighbor(), and QgsPoint::sqrDist().

Referenced by addSamplePoints().

int QgsPointSample::createRandomPoints

(

QProgressDialog *

pd

)

Starts calculation of random points.

Returns

0 in case of success

Definition at line 23 of file qgspointsample.cpp.

References addSamplePoints(), QgsFields::append(), QgsFeature::attribute(), QgsMapLayer::crs(), QgsVectorFileWriter::deleteShapeFile(), QgsVectorLayer::geometryType(), QgsVectorLayer::getFeatures(), QgsVectorFileWriter::hasError(), mInputLayer, mMinDistanceAttribute, mNCreatedPoints, mNumberOfPointsAttribute, mOutputLayer, mt_srand(), QgsFeatureIterator::nextFeature(), QgsVectorFileWriter::NoError, QgsVectorLayer::pendingFields(), QGis::Polygon, and QGis::WKBPoint.

Member Data Documentation

QgsVectorLayer* QgsPointSample::mInputLayer

private

Layer id of input polygon/multipolygon layer.

Definition at line 32 of file qgspointsample.h.

Referenced by createRandomPoints().

QString QgsPointSample::mMinDistanceAttribute

private

Attribute containing minimum distance between sample points (or -1 if no min.

distance constraint)

Definition at line 38 of file qgspointsample.h.

Referenced by createRandomPoints().

QgsFeatureId QgsPointSample::mNCreatedPoints

private

Definition at line 39 of file qgspointsample.h.

Referenced by addSamplePoints(), and createRandomPoints().

QString QgsPointSample::mNumberOfPointsAttribute

private

Attribute containing number of points per feature.

Definition at line 36 of file qgspointsample.h.

Referenced by createRandomPoints().

QString QgsPointSample::mOutputLayer

private

Output path of result layer.

Definition at line 34 of file qgspointsample.h.

Referenced by createRandomPoints().

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

• /tmp/buildd/qgis-2.2.0+wheezy1/src/analysis/vector/qgspointsample.h
• /tmp/buildd/qgis-2.2.0+wheezy1/src/analysis/vector/qgspointsample.cpp