QgsTransectSample Class Reference

A class for the creation of transect sample lines based on a set of strata polygons and baselines. More...

#include <qgstransectsample.h>

Collaboration diagram for QgsTransectSample:

Public Types
enum	DistanceUnits { Meters, StrataUnits }

Public Member Functions
	QgsTransectSample (QgsVectorLayer *strataLayer, QString strataIdAttribute, QString minDistanceAttribute, QString nPointsAttribute, DistanceUnits minDistUnits, QgsVectorLayer *baselineLayer, bool shareBaseline, QString baselineStrataId, const QString &outputPointLayer, const QString &outputLineLayer, const QString &usedBaselineLayer, double minTransectLength=0.0)
	~QgsTransectSample ()
int	createSample (QProgressDialog *pd)

Private Member Functions
	QgsTransectSample ()
QgsGeometry *	findBaselineGeometry (QVariant strataId)

Static Private Member Functions
static bool	otherTransectWithinDistance (QgsGeometry *geom, double minDistLayerUnit, double minDistance, QgsSpatialIndex &sIndex, const QMap< QgsFeatureId, QgsGeometry * > &lineFeatureMap, QgsDistanceArea &da)
	Returns true if another transect is within the specified minimum distance.
static bool	closestSegmentPoints (QgsGeometry &g1, QgsGeometry &g2, double &dist, QgsPoint &pt1, QgsPoint &pt2)
	Finds the closest points between two line segments.
static QgsGeometry *	closestMultilineElement (const QgsPoint &pt, QgsGeometry *multiLine)
	Returns a copy of the multiline element closest to a point (caller takes ownership)
static QgsGeometry *	clipBufferLine (QgsGeometry *stratumGeom, QgsGeometry *clippedBaseline, double tolerance)
	Returns clipped buffer line.

Private Attributes
QgsVectorLayer *	mStrataLayer
QString	mStrataIdAttribute
QString	mMinDistanceAttribute
QString	mNPointsAttribute
QgsVectorLayer *	mBaselineLayer
bool	mShareBaseline
QString	mBaselineStrataId
QString	mOutputPointLayer
QString	mOutputLineLayer
QString	mUsedBaselineLayer
DistanceUnits	mMinDistanceUnits
double	mMinTransectLength

Detailed Description

A class for the creation of transect sample lines based on a set of strata polygons and baselines.

Definition at line 16 of file qgstransectsample.h.

Member Enumeration Documentation

enum QgsTransectSample::DistanceUnits

Enumerator:

Meters
StrataUnits

Definition at line 20 of file qgstransectsample.h.

Constructor & Destructor Documentation

QgsTransectSample::QgsTransectSample	(	QgsVectorLayer *	strataLayer,
		QString	strataIdAttribute,
		QString	minDistanceAttribute,
		QString	nPointsAttribute,
		DistanceUnits	minDistUnits,
		QgsVectorLayer *	baselineLayer,
		bool	shareBaseline,
		QString	baselineStrataId,
		const QString &	outputPointLayer,
		const QString &	outputLineLayer,
		const QString &	usedBaselineLayer,
		double	minTransectLength = 0.0
	)

Definition at line 15 of file qgstransectsample.cpp.

QgsTransectSample::~QgsTransectSample

(

)

Definition at line 28 of file qgstransectsample.cpp.

QgsTransectSample::QgsTransectSample ( )

private

Definition at line 24 of file qgstransectsample.cpp.

Member Function Documentation

QgsGeometry * QgsTransectSample::clipBufferLine ( QgsGeometry *  stratumGeom, QgsGeometry *  clippedBaseline, double  tolerance  )

staticprivate

Returns clipped buffer line.

Iteratively applies reduced tolerances if the result is not a single line

Parameters

stratumGeom	stratum polygon
clippedBaseline	base line geometry clipped to the stratum
tolerance	buffer distance (in layer units)

Returns

clipped buffer line or 0 in case of error

Definition at line 538 of file qgstransectsample.cpp.

References QgsGeometry::asMultiPolygon(), QgsGeometry::asPolygon(), QgsGeometry::buffer(), QgsGeometry::fromMultiPolyline(), QgsGeometry::fromPolygon(), QgsGeometry::intersection(), QgsGeometry::intersects(), QgsGeometry::isMultipart(), QGis::Line, size, QgsGeometry::type(), QGis::WKBMultiPolygon, QGis::WKBMultiPolygon25D, QgsGeometry::wkbType(), and QGis::WKBUnknown.

Referenced by createSample().

QgsGeometry * QgsTransectSample::closestMultilineElement ( const QgsPoint &  pt, QgsGeometry *  multiLine  )

staticprivate

Returns a copy of the multiline element closest to a point (caller takes ownership)

Definition at line 503 of file qgstransectsample.cpp.

References QgsGeometry::asMultiPolyline(), QgsGeometry::distance(), QgsGeometry::fromPoint(), QgsGeometry::fromPolyline(), QGis::WKBMultiLineString, QGis::WKBMultiLineString25D, and QgsGeometry::wkbType().

Referenced by createSample().

bool QgsTransectSample::closestSegmentPoints ( QgsGeometry &  g1, QgsGeometry &  g2, double &  dist, QgsPoint &  pt1, QgsPoint &  pt2  )

staticprivate

Finds the closest points between two line segments.

Parameters

g1	first input geometry. Must be a linestring with two vertices
g2	second input geometry. Must be a linestring with two vertices
dist	out: distance between the segments
pt1	out: closest point on first geometry
pt2	out: closest point on secont geometry

Returns

true in case of success

Definition at line 381 of file qgstransectsample.cpp.

References QgsGeometry::asPolyline(), qgsDoubleNear(), QgsPoint::setX(), QgsPoint::setY(), QgsPoint::sqrDist(), QgsPoint::sqrDistToSegment(), QGis::WKBLineString, QGis::WKBLineString25D, QgsGeometry::wkbType(), QgsPoint::x(), and QgsPoint::y().

Referenced by otherTransectWithinDistance().

int QgsTransectSample::createSample

(

QProgressDialog *

pd

)

Definition at line 32 of file qgstransectsample.cpp.

References QgsVectorFileWriter::addFeature(), QgsFields::append(), QgsGeometry::asPoint(), QgsFeature::attribute(), QgsDistanceArea::bearing(), clipBufferLine(), closestMultilineElement(), QgsGeometry::closestSegmentWithContext(), QgsMapLayer::crs(), QGis::DecimalDegrees, QgsGeometry::distance(), QgsCoordinateReferenceSystem::EpsgCrsId, QgsVectorLayer::featureCount(), QgsFields::field(), findBaselineGeometry(), QgsGeometry::fromPolyline(), QgsFeature::geometry(), QgsFeature::geometryAndOwnership(), QgsVectorLayer::getFeatures(), QgsVectorFileWriter::hasError(), QgsSpatialIndex::insertFeature(), QgsGeometry::interpolate(), QgsGeometry::intersection(), QgsMapLayer::isValid(), QgsGeometry::length(), M_PI, QgsCoordinateReferenceSystem::mapUnits(), mBaselineLayer, MD_RAND_MAX, QgsDistanceArea::measure(), Meters, mMinDistanceAttribute, mMinDistanceUnits, mMinTransectLength, mNPointsAttribute, mOutputLineLayer, mOutputPointLayer, mStrataIdAttribute, mStrataLayer, mt_rand(), mt_srand(), mUsedBaselineLayer, QgsFeatureIterator::nextFeature(), QgsVectorFileWriter::NoError, otherTransectWithinDistance(), QgsVectorLayer::pendingFields(), QgsFeature::setAttribute(), QgsDistanceArea::setEllipsoidalMode(), QgsFeature::setGeometry(), QgsDistanceArea::setSourceCrs(), QgsFeatureRequest::setSubsetOfAttributes(), QgsCoordinateReferenceSystem::srsid(), QgsField::type(), QGis::WKBLineString, QGis::WKBMultiLineString, QGis::WKBMultiLineString25D, QGis::WKBPoint, QgsGeometry::wkbType(), QGis::WKBUnknown, QgsPoint::x(), and QgsPoint::y().

QgsGeometry * QgsTransectSample::findBaselineGeometry ( QVariant  strataId )

private

Definition at line 322 of file qgstransectsample.cpp.

References QgsFeature::attribute(), QgsFeature::geometryAndOwnership(), QgsVectorLayer::getFeatures(), mBaselineLayer, mBaselineStrataId, mShareBaseline, QgsFeatureIterator::nextFeature(), and QgsVectorLayer::pendingFields().

Referenced by createSample().

bool QgsTransectSample::otherTransectWithinDistance ( QgsGeometry *  geom, double  minDistLayerUnit, double  minDistance, QgsSpatialIndex &  sIndex, const QMap< QgsFeatureId, QgsGeometry * > &  lineFeatureMap, QgsDistanceArea &  da  )

staticprivate

Returns true if another transect is within the specified minimum distance.

Definition at line 342 of file qgstransectsample.cpp.

References QgsGeometry::boundingBox(), QgsGeometry::buffer(), closestSegmentPoints(), QgsSpatialIndex::intersects(), and QgsDistanceArea::measureLine().

Referenced by createSample().

Member Data Documentation

QgsVectorLayer* QgsTransectSample::mBaselineLayer

private

Definition at line 47 of file qgstransectsample.h.

Referenced by createSample(), and findBaselineGeometry().

QString QgsTransectSample::mBaselineStrataId

private

Definition at line 49 of file qgstransectsample.h.

Referenced by findBaselineGeometry().

QString QgsTransectSample::mMinDistanceAttribute

private

Definition at line 44 of file qgstransectsample.h.

Referenced by createSample().

DistanceUnits QgsTransectSample::mMinDistanceUnits

private

Definition at line 55 of file qgstransectsample.h.

Referenced by createSample().

double QgsTransectSample::mMinTransectLength

private

Definition at line 57 of file qgstransectsample.h.

Referenced by createSample().

QString QgsTransectSample::mNPointsAttribute

private

Definition at line 45 of file qgstransectsample.h.

Referenced by createSample().

QString QgsTransectSample::mOutputLineLayer

private

Definition at line 52 of file qgstransectsample.h.

Referenced by createSample().

QString QgsTransectSample::mOutputPointLayer

private

Definition at line 51 of file qgstransectsample.h.

Referenced by createSample().

bool QgsTransectSample::mShareBaseline

private

Definition at line 48 of file qgstransectsample.h.

Referenced by findBaselineGeometry().

QString QgsTransectSample::mStrataIdAttribute

private

Definition at line 43 of file qgstransectsample.h.

Referenced by createSample().

QgsVectorLayer* QgsTransectSample::mStrataLayer

private

Definition at line 42 of file qgstransectsample.h.

Referenced by createSample().

QString QgsTransectSample::mUsedBaselineLayer

private

Definition at line 53 of file qgstransectsample.h.

Referenced by createSample().

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