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. More...

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. More...
QString	mOutputLayer
	Output path of result layer. More...
QString	mNumberOfPointsAttribute
	Attribute containing number of points per feature. More...
QString	mMinDistanceAttribute
	Attribute containing minimum distance between sample points (or -1 if no min. More...
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-2.4.0+unstable1/src/analysis/vector/qgspointsample.h
• /tmp/buildd/qgis-2.4.0+unstable1/src/analysis/vector/qgspointsample.cpp