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qgslinestring.cpp
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qgslinestring.cpp
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/***************************************************************************
qgslinestring.cpp
-------------------
begin : September 2014
copyright : (C) 2014 by Marco Hugentobler
email : marco at sourcepole dot ch
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "qgslinestring.h"
#include "qgsapplication.h"
#include "qgscompoundcurve.h"
#include "qgscoordinatetransform.h"
#include "qgsgeometryutils.h"
#include "qgsmaptopixel.h"
#include "qgswkbptr.h"
#include "qgslinesegment.h"
#include <nlohmann/json.hpp>
#include <cmath>
#include <memory>
#include <QPainter>
#include <limits>
#include <QDomDocument>
#include <QJsonObject>
/***************************************************************************
* This class is considered CRITICAL and any change MUST be accompanied with
* full unit tests.
* See details in QEP #17
****************************************************************************/
QgsLineString::QgsLineString()
{
mWkbType = QgsWkbTypes::LineString;
}
QgsLineString::QgsLineString( const QVector<QgsPoint> &points )
{
if ( points.isEmpty() )
{
mWkbType = QgsWkbTypes::LineString;
return;
}
QgsWkbTypes::Type ptType = points.at( 0 ).wkbType();
mWkbType = QgsWkbTypes::zmType( QgsWkbTypes::LineString, QgsWkbTypes::hasZ( ptType ), QgsWkbTypes::hasM( ptType ) );
mX.resize( points.count() );
mY.resize( points.count() );
double *x = mX.data();
double *y = mY.data();
double *z = nullptr;
double *m = nullptr;
if ( QgsWkbTypes::hasZ( mWkbType ) )
{
mZ.resize( points.count() );
z = mZ.data();
}
if ( QgsWkbTypes::hasM( mWkbType ) )
{
mM.resize( points.count() );
m = mM.data();
}
for ( const QgsPoint &pt : points )
{
*x++ = pt.x();
*y++ = pt.y();
if ( z )
*z++ = pt.z();
if ( m )
*m++ = pt.m();
}
}
QgsLineString::QgsLineString( const QVector<double> &x, const QVector<double> &y, const QVector<double> &z, const QVector<double> &m, bool is25DType )
{
mWkbType = QgsWkbTypes::LineString;
int pointCount = std::min( x.size(), y.size() );
if ( x.size() == pointCount )
{
mX = x;
}
else
{
mX = x.mid( 0, pointCount );
}
if ( y.size() == pointCount )
{
mY = y;
}
else
{
mY = y.mid( 0, pointCount );
}
if ( !z.isEmpty() && z.count() >= pointCount )
{
mWkbType = is25DType ? QgsWkbTypes::LineString25D : QgsWkbTypes::LineStringZ;
if ( z.size() == pointCount )
{
mZ = z;
}
else
{
mZ = z.mid( 0, pointCount );
}
}
if ( !m.isEmpty() && m.count() >= pointCount )
{
mWkbType = QgsWkbTypes::addM( mWkbType );
if ( m.size() == pointCount )
{
mM = m;
}
else
{
mM = m.mid( 0, pointCount );
}
}
}
QgsLineString::QgsLineString( const QgsPoint &p1, const QgsPoint &p2 )
{
mWkbType = QgsWkbTypes::LineString;
mX.resize( 2 );
mX[ 0 ] = p1.x();
mX[ 1 ] = p2.x();
mY.resize( 2 );
mY[ 0 ] = p1.y();
mY[ 1 ] = p2.y();
if ( p1.is3D() )
{
mWkbType = QgsWkbTypes::addZ( mWkbType );
mZ.resize( 2 );
mZ[ 0 ] = p1.z();
mZ[ 1 ] = p2.z();
}
if ( p1.isMeasure() )
{
mWkbType = QgsWkbTypes::addM( mWkbType );
mM.resize( 2 );
mM[ 0 ] = p1.m();
mM[ 1 ] = p2.m();
}
}
QgsLineString::QgsLineString( const QVector<QgsPointXY> &points )
{
mWkbType = QgsWkbTypes::LineString;
mX.reserve( points.size() );
mY.reserve( points.size() );
for ( const QgsPointXY &p : points )
{
mX << p.x();
mY << p.y();
}
}
QgsLineString::QgsLineString( const QgsLineSegment2D &segment )
{
mWkbType = QgsWkbTypes::LineString;
mX.resize( 2 );
mY.resize( 2 );
mX[0] = segment.startX();
mX[1] = segment.endX();
mY[0] = segment.startY();
mY[1] = segment.endY();
}
static double cubicInterpolate( double a, double b,
double A, double B, double C, double D )
{
return A * b * b * b + 3 * B * b * b * a + 3 * C * b * a * a + D * a * a * a;
}
QgsLineString *QgsLineString::fromBezierCurve( const QgsPoint &start, const QgsPoint &controlPoint1, const QgsPoint &controlPoint2, const QgsPoint &end, int segments )
{
if ( segments == 0 )
return new QgsLineString();
QVector<double> x;
x.resize( segments + 1 );
QVector<double> y;
y.resize( segments + 1 );
QVector<double> z;
double *zData = nullptr;
if ( start.is3D() && end.is3D() && controlPoint1.is3D() && controlPoint2.is3D() )
{
z.resize( segments + 1 );
zData = z.data();
}
QVector<double> m;
double *mData = nullptr;
if ( start.isMeasure() && end.isMeasure() && controlPoint1.isMeasure() && controlPoint2.isMeasure() )
{
m.resize( segments + 1 );
mData = m.data();
}
double *xData = x.data();
double *yData = y.data();
const double step = 1.0 / segments;
double a = 0;
double b = 1.0;
for ( int i = 0; i < segments; i++, a += step, b -= step )
{
if ( i == 0 )
{
*xData++ = start.x();
*yData++ = start.y();
if ( zData )
*zData++ = start.z();
if ( mData )
*mData++ = start.m();
}
else
{
*xData++ = cubicInterpolate( a, b, start.x(), controlPoint1.x(), controlPoint2.x(), end.x() );
*yData++ = cubicInterpolate( a, b, start.y(), controlPoint1.y(), controlPoint2.y(), end.y() );
if ( zData )
*zData++ = cubicInterpolate( a, b, start.z(), controlPoint1.z(), controlPoint2.z(), end.z() );
if ( mData )
*mData++ = cubicInterpolate( a, b, start.m(), controlPoint1.m(), controlPoint2.m(), end.m() );
}
}
*xData = end.x();
*yData = end.y();
if ( zData )
*zData = end.z();
if ( mData )
*mData = end.m();
return new QgsLineString( x, y, z, m );
}
QgsLineString *QgsLineString::fromQPolygonF( const QPolygonF &polygon )
{
QVector< double > x;
QVector< double > y;
x.resize( polygon.count() );
y.resize( polygon.count() );
double *xData = x.data();
double *yData = y.data();
const QPointF *src = polygon.data();
for ( int i = 0 ; i < polygon.size(); ++ i )
{
*xData++ = src->x();
*yData++ = src->y();
src++;
}
return new QgsLineString( x, y );
}
bool QgsLineString::equals( const QgsCurve &other ) const
{
const QgsLineString *otherLine = qgsgeometry_cast< const QgsLineString * >( &other );
if ( !otherLine )
return false;
if ( mWkbType != otherLine->mWkbType )
return false;
if ( mX.count() != otherLine->mX.count() )
return false;
for ( int i = 0; i < mX.count(); ++i )
{
if ( !qgsDoubleNear( mX.at( i ), otherLine->mX.at( i ) )
|| !qgsDoubleNear( mY.at( i ), otherLine->mY.at( i ) ) )
return false;
if ( is3D() && !qgsDoubleNear( mZ.at( i ), otherLine->mZ.at( i ) ) )
return false;
if ( isMeasure() && !qgsDoubleNear( mM.at( i ), otherLine->mM.at( i ) ) )
return false;
}
return true;
}
QgsLineString *QgsLineString::clone() const
{
return new QgsLineString( *this );
}
void QgsLineString::clear()
{
mX.clear();
mY.clear();
mZ.clear();
mM.clear();
mWkbType = QgsWkbTypes::LineString;
clearCache();
}
bool QgsLineString::isEmpty() const
{
return mX.isEmpty();
}
QgsLineString *QgsLineString::snappedToGrid( double hSpacing, double vSpacing, double dSpacing, double mSpacing ) const
{
// prepare result
std::unique_ptr<QgsLineString> result { createEmptyWithSameType() };
bool res = snapToGridPrivate( hSpacing, vSpacing, dSpacing, mSpacing, mX, mY, mZ, mM,
result->mX, result->mY, result->mZ, result->mM );
if ( res )
return result.release();
else
return nullptr;
}
bool QgsLineString::removeDuplicateNodes( double epsilon, bool useZValues )
{
if ( mX.count() <= 2 )
return false; // don't create degenerate lines
bool result = false;
double prevX = mX.at( 0 );
double prevY = mY.at( 0 );
bool hasZ = is3D();
bool useZ = hasZ && useZValues;
double prevZ = useZ ? mZ.at( 0 ) : 0;
int i = 1;
int remaining = mX.count();
while ( i < remaining )
{
double currentX = mX.at( i );
double currentY = mY.at( i );
double currentZ = useZ ? mZ.at( i ) : 0;
if ( qgsDoubleNear( currentX, prevX, epsilon ) &&
qgsDoubleNear( currentY, prevY, epsilon ) &&
( !useZ || qgsDoubleNear( currentZ, prevZ, epsilon ) ) )
{
result = true;
// remove point
mX.removeAt( i );
mY.removeAt( i );
if ( hasZ )
mZ.removeAt( i );
remaining--;
}
else
{
prevX = currentX;
prevY = currentY;
prevZ = currentZ;
i++;
}
}
return result;
}
QPolygonF QgsLineString::asQPolygonF() const
{
const int nb = mX.size();
QPolygonF points( nb );
const double *x = mX.constData();
const double *y = mY.constData();
QPointF *dest = points.data();
for ( int i = 0; i < nb; ++i )
{
*dest++ = QPointF( *x++, *y++ );
}
return points;
}
bool QgsLineString::fromWkb( QgsConstWkbPtr &wkbPtr )
{
if ( !wkbPtr )
{
return false;
}
QgsWkbTypes::Type type = wkbPtr.readHeader();
if ( QgsWkbTypes::flatType( type ) != QgsWkbTypes::LineString )
{
return false;
}
mWkbType = type;
importVerticesFromWkb( wkbPtr );
return true;
}
QgsRectangle QgsLineString::calculateBoundingBox() const
{
double xmin = std::numeric_limits<double>::max();
double ymin = std::numeric_limits<double>::max();
double xmax = -std::numeric_limits<double>::max();
double ymax = -std::numeric_limits<double>::max();
for ( double x : mX )
{
if ( x < xmin )
xmin = x;
if ( x > xmax )
xmax = x;
}
for ( double y : mY )
{
if ( y < ymin )
ymin = y;
if ( y > ymax )
ymax = y;
}
return QgsRectangle( xmin, ymin, xmax, ymax );
}
/***************************************************************************
* This class is considered CRITICAL and any change MUST be accompanied with
* full unit tests.
* See details in QEP #17
****************************************************************************/
bool QgsLineString::fromWkt( const QString &wkt )
{
clear();
QPair<QgsWkbTypes::Type, QString> parts = QgsGeometryUtils::wktReadBlock( wkt );
if ( QgsWkbTypes::flatType( parts.first ) != QgsWkbTypes::LineString )
return false;
mWkbType = parts.first;
if ( parts.second.compare( QLatin1String( "EMPTY" ), Qt::CaseInsensitive ) == 0 )
return true;
if ( parts.second.compare( QLatin1String( "NULL" ), Qt::CaseInsensitive ) == 0 )
return false;
setPoints( QgsGeometryUtils::pointsFromWKT( parts.second, is3D(), isMeasure() ) );
return true;
}
QByteArray QgsLineString::asWkb( WkbFlags ) const
{
int binarySize = sizeof( char ) + sizeof( quint32 ) + sizeof( quint32 );
binarySize += numPoints() * ( 2 + is3D() + isMeasure() ) * sizeof( double );
QByteArray wkbArray;
wkbArray.resize( binarySize );
QgsWkbPtr wkb( wkbArray );
wkb << static_cast<char>( QgsApplication::endian() );
wkb << static_cast<quint32>( wkbType() );
QgsPointSequence pts;
points( pts );
QgsGeometryUtils::pointsToWKB( wkb, pts, is3D(), isMeasure() );
return wkbArray;
}
/***************************************************************************
* This class is considered CRITICAL and any change MUST be accompanied with
* full unit tests.
* See details in QEP #17
****************************************************************************/
QString QgsLineString::asWkt( int precision ) const
{
QString wkt = wktTypeStr() + ' ';
if ( isEmpty() )
wkt += QStringLiteral( "EMPTY" );
else
{
QgsPointSequence pts;
points( pts );
wkt += QgsGeometryUtils::pointsToWKT( pts, precision, is3D(), isMeasure() );
}
return wkt;
}
QDomElement QgsLineString::asGml2( QDomDocument &doc, int precision, const QString &ns, const AxisOrder axisOrder ) const
{
QgsPointSequence pts;
points( pts );
QDomElement elemLineString = doc.createElementNS( ns, QStringLiteral( "LineString" ) );
if ( isEmpty() )
return elemLineString;
elemLineString.appendChild( QgsGeometryUtils::pointsToGML2( pts, doc, precision, ns, axisOrder ) );
return elemLineString;
}
QDomElement QgsLineString::asGml3( QDomDocument &doc, int precision, const QString &ns, const QgsAbstractGeometry::AxisOrder axisOrder ) const
{
QgsPointSequence pts;
points( pts );
QDomElement elemLineString = doc.createElementNS( ns, QStringLiteral( "LineString" ) );
if ( isEmpty() )
return elemLineString;
elemLineString.appendChild( QgsGeometryUtils::pointsToGML3( pts, doc, precision, ns, is3D(), axisOrder ) );
return elemLineString;
}
json QgsLineString::asJsonObject( int precision ) const
{
QgsPointSequence pts;
points( pts );
return
{
{ "type", "LineString" },
{ "coordinates", QgsGeometryUtils::pointsToJson( pts, precision ) }
};
}
QString QgsLineString::asKml( int precision ) const
{
QString kml;
if ( isRing() )
{
kml.append( QLatin1String( "<LinearRing>" ) );
}
else
{
kml.append( QLatin1String( "<LineString>" ) );
}
bool z = is3D();
kml.append( QLatin1String( "<altitudeMode>" ) );
if ( z )
{
kml.append( QLatin1String( "absolute" ) );
}
else
{
kml.append( QLatin1String( "clampToGround" ) );
}
kml.append( QLatin1String( "</altitudeMode>" ) );
kml.append( QLatin1String( "<coordinates>" ) );
int nPoints = mX.size();
for ( int i = 0; i < nPoints; ++i )
{
if ( i > 0 )
{
kml.append( QLatin1String( " " ) );
}
kml.append( qgsDoubleToString( mX[i], precision ) );
kml.append( QLatin1String( "," ) );
kml.append( qgsDoubleToString( mY[i], precision ) );
if ( z )
{
kml.append( QLatin1String( "," ) );
kml.append( qgsDoubleToString( mZ[i], precision ) );
}
else
{
kml.append( QLatin1String( ",0" ) );
}
}
kml.append( QLatin1String( "</coordinates>" ) );
if ( isRing() )
{
kml.append( QLatin1String( "</LinearRing>" ) );
}
else
{
kml.append( QLatin1String( "</LineString>" ) );
}
return kml;
}
/***************************************************************************
* This class is considered CRITICAL and any change MUST be accompanied with
* full unit tests.
* See details in QEP #17
****************************************************************************/
double QgsLineString::length() const
{
double length = 0;
int size = mX.size();
double dx, dy;
for ( int i = 1; i < size; ++i )
{
dx = mX.at( i ) - mX.at( i - 1 );
dy = mY.at( i ) - mY.at( i - 1 );
length += std::sqrt( dx * dx + dy * dy );
}
return length;
}
double QgsLineString::length3D() const
{
if ( is3D() )
{
double length = 0;
int size = mX.size();
double dx, dy, dz;
for ( int i = 1; i < size; ++i )
{
dx = mX.at( i ) - mX.at( i - 1 );
dy = mY.at( i ) - mY.at( i - 1 );
dz = mZ.at( i ) - mZ.at( i - 1 );
length += std::sqrt( dx * dx + dy * dy + dz * dz );
}
return length;
}
else
{
return length();
}
}
QgsPoint QgsLineString::startPoint() const
{
if ( numPoints() < 1 )
{
return QgsPoint();
}
return pointN( 0 );
}
QgsPoint QgsLineString::endPoint() const
{
if ( numPoints() < 1 )
{
return QgsPoint();
}
return pointN( numPoints() - 1 );
}
/***************************************************************************
* This class is considered CRITICAL and any change MUST be accompanied with
* full unit tests.
* See details in QEP #17
****************************************************************************/
QgsLineString *QgsLineString::curveToLine( double tolerance, SegmentationToleranceType toleranceType ) const
{
Q_UNUSED( tolerance )
Q_UNUSED( toleranceType )
return clone();
}
int QgsLineString::numPoints() const
{
return mX.size();
}
int QgsLineString::nCoordinates() const
{
return mX.size();
}
QgsPoint QgsLineString::pointN( int i ) const
{
if ( i < 0 || i >= mX.size() )
{
return QgsPoint();
}
double x = mX.at( i );
double y = mY.at( i );
double z = std::numeric_limits<double>::quiet_NaN();
double m = std::numeric_limits<double>::quiet_NaN();
bool hasZ = is3D();
if ( hasZ )
{
z = mZ.at( i );
}
bool hasM = isMeasure();
if ( hasM )
{
m = mM.at( i );
}
QgsWkbTypes::Type t = QgsWkbTypes::Point;
if ( mWkbType == QgsWkbTypes::LineString25D )
{
t = QgsWkbTypes::Point25D;
}
else if ( hasZ && hasM )
{
t = QgsWkbTypes::PointZM;
}
else if ( hasZ )
{
t = QgsWkbTypes::PointZ;
}
else if ( hasM )
{
t = QgsWkbTypes::PointM;
}
return QgsPoint( t, x, y, z, m );
}
/***************************************************************************
* This class is considered CRITICAL and any change MUST be accompanied with
* full unit tests.
* See details in QEP #17
****************************************************************************/
double QgsLineString::xAt( int index ) const
{
if ( index >= 0 && index < mX.size() )
return mX.at( index );
else
return 0.0;
}
double QgsLineString::yAt( int index ) const
{
if ( index >= 0 && index < mY.size() )
return mY.at( index );
else
return 0.0;
}
void QgsLineString::setXAt( int index, double x )
{
if ( index >= 0 && index < mX.size() )
mX[ index ] = x;
clearCache();
}
void QgsLineString::setYAt( int index, double y )
{
if ( index >= 0 && index < mY.size() )
mY[ index ] = y;
clearCache();
}
/***************************************************************************
* This class is considered CRITICAL and any change MUST be accompanied with
* full unit tests.
* See details in QEP #17
****************************************************************************/
void QgsLineString::points( QgsPointSequence &pts ) const
{
pts.clear();
int nPoints = numPoints();
pts.reserve( nPoints );
for ( int i = 0; i < nPoints; ++i )
{
pts.push_back( pointN( i ) );
}
}
void QgsLineString::setPoints( const QgsPointSequence &points )
{
clearCache(); //set bounding box invalid
if ( points.isEmpty() )
{
clear();
return;
}
//get wkb type from first point
const QgsPoint &firstPt = points.at( 0 );
bool hasZ = firstPt.is3D();
bool hasM = firstPt.isMeasure();
setZMTypeFromSubGeometry( &firstPt, QgsWkbTypes::LineString );
mX.resize( points.size() );
mY.resize( points.size() );
if ( hasZ )
{
mZ.resize( points.size() );
}
else
{
mZ.clear();
}
if ( hasM )
{
mM.resize( points.size() );
}
else
{
mM.clear();
}
for ( int i = 0; i < points.size(); ++i )
{
mX[i] = points.at( i ).x();
mY[i] = points.at( i ).y();
if ( hasZ )
{
double z = points.at( i ).z();
mZ[i] = std::isnan( z ) ? 0 : z;
}
if ( hasM )
{
double m = points.at( i ).m();
mM[i] = std::isnan( m ) ? 0 : m;
}
}
}
/***************************************************************************
* This class is considered CRITICAL and any change MUST be accompanied with
* full unit tests.
* See details in QEP #17
****************************************************************************/
void QgsLineString::append( const QgsLineString *line )
{
if ( !line )
{
return;
}
if ( numPoints() < 1 )
{
setZMTypeFromSubGeometry( line, QgsWkbTypes::LineString );
}
// do not store duplicit points
if ( numPoints() > 0 &&
line->numPoints() > 0 &&
endPoint() == line->startPoint() )
{
mX.pop_back();
mY.pop_back();
if ( is3D() )
{
mZ.pop_back();
}
if ( isMeasure() )
{
mM.pop_back();
}
}
mX += line->mX;
mY += line->mY;
if ( is3D() )
{
if ( line->is3D() )
{
mZ += line->mZ;
}
else
{
// if append line does not have z coordinates, fill with NaN to match number of points in final line
mZ.insert( mZ.count(), mX.size() - mZ.size(), std::numeric_limits<double>::quiet_NaN() );
}
}
if ( isMeasure() )
{
if ( line->isMeasure() )
{
mM += line->mM;
}
else
{
// if append line does not have m values, fill with NaN to match number of points in final line
mM.insert( mM.count(), mX.size() - mM.size(), std::numeric_limits<double>::quiet_NaN() );
}
}
clearCache(); //set bounding box invalid
}
QgsLineString *QgsLineString::reversed() const
{
QgsLineString *copy = clone();
std::reverse( copy->mX.begin(), copy->mX.end() );
std::reverse( copy->mY.begin(), copy->mY.end() );
if ( copy->is3D() )
{
std::reverse( copy->mZ.begin(), copy->mZ.end() );
}
if ( copy->isMeasure() )
{
std::reverse( copy->mM.begin(), copy->mM.end() );
}
return copy;
}
void QgsLineString::visitPointsByRegularDistance( const double distance, const std::function<bool ( double, double, double, double, double, double, double, double, double, double, double, double )> &visitPoint ) const
{
if ( distance < 0 )
return;
double distanceTraversed = 0;
const int totalPoints = numPoints();
if ( totalPoints == 0 )
return;
const double *x = mX.constData();
const double *y = mY.constData();
const double *z = is3D() ? mZ.constData() : nullptr;
const double *m = isMeasure() ? mM.constData() : nullptr;
double prevX = *x++;
double prevY = *y++;
double prevZ = z ? *z++ : 0.0;
double prevM = m ? *m++ : 0.0;
if ( qgsDoubleNear( distance, 0.0 ) )
{
visitPoint( prevX, prevY, prevZ, prevM, prevX, prevY, prevZ, prevM, prevX, prevY, prevZ, prevM );
return;
}
double pZ = std::numeric_limits<double>::quiet_NaN();
double pM = std::numeric_limits<double>::quiet_NaN();
double nextPointDistance = distance;
for ( int i = 1; i < totalPoints; ++i )
{
double thisX = *x++;
double thisY = *y++;
double thisZ = z ? *z++ : 0.0;
double thisM = m ? *m++ : 0.0;
const double segmentLength = std::sqrt( ( thisX - prevX ) * ( thisX - prevX ) + ( thisY - prevY ) * ( thisY - prevY ) );
while ( nextPointDistance < distanceTraversed + segmentLength || qgsDoubleNear( nextPointDistance, distanceTraversed + segmentLength ) )
{
// point falls on this segment - truncate to segment length if qgsDoubleNear test was actually > segment length
const double distanceToPoint = std::min( nextPointDistance - distanceTraversed, segmentLength );
double pX, pY;
QgsGeometryUtils::pointOnLineWithDistance( prevX, prevY, thisX, thisY, distanceToPoint, pX, pY,
z ? &prevZ : nullptr, z ? &thisZ : nullptr, z ? &pZ : nullptr,
m ? &prevM : nullptr, m ? &thisM : nullptr, m ? &pM : nullptr );
if ( !visitPoint( pX, pY, pZ, pM, prevX, prevY, prevZ, prevM, thisX, thisY, thisZ, thisM ) )
return;
nextPointDistance += distance;
}
distanceTraversed += segmentLength;
prevX = thisX;
prevY = thisY;
prevZ = thisZ;
prevM = thisM;
}
}
QgsPoint *QgsLineString::interpolatePoint( const double distance ) const
{
if ( distance < 0 )
return nullptr;
QgsWkbTypes::Type pointType = QgsWkbTypes::Point;
if ( is3D() )
pointType = QgsWkbTypes::PointZ;
if ( isMeasure() )
pointType = QgsWkbTypes::addM( pointType );
std::unique_ptr< QgsPoint > res;
visitPointsByRegularDistance( distance, [ & ]( double x, double y, double z, double m, double, double, double, double, double, double, double, double )->bool
{
res = qgis::make_unique< QgsPoint >( pointType, x, y, z, m );
return false;
} );
return res.release();
}
QgsLineString *QgsLineString::curveSubstring( double startDistance, double endDistance ) const
{
if ( startDistance < 0 && endDistance < 0 )
return createEmptyWithSameType();
endDistance = std::max( startDistance, endDistance );
double distanceTraversed = 0;
const int totalPoints = numPoints();
if ( totalPoints == 0 )
return clone();
QVector< QgsPoint > substringPoints;
QgsWkbTypes::Type pointType = QgsWkbTypes::Point;
if ( is3D() )
pointType = QgsWkbTypes::PointZ;
if ( isMeasure() )
pointType = QgsWkbTypes::addM( pointType );
const double *x = mX.constData();
const double *y = mY.constData();
const double *z = is3D() ? mZ.constData() : nullptr;
const double *m = isMeasure() ? mM.constData() : nullptr;