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qgsgeometry.cpp
5526 lines (4892 loc) · 137 KB
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qgsgeometry.cpp
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/***************************************************************************
qgsgeometry.cpp - Geometry (stored as Open Geospatial Consortium WKB)
-------------------------------------------------------------------
Date : 02 May 2005
Copyright : (C) 2005 by Brendan Morley
email : morb at ozemail dot com dot au
***************************************************************************
* *
* 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. *
* *
***************************************************************************/
/* $Id$ */
#include <limits>
#include <cstdarg>
#include <cstdio>
#include "qgis.h"
#include "qgsgeometry.h"
#include "qgsapplication.h"
#include "qgslogger.h"
#include "qgspoint.h"
#include "qgsrectangle.h"
#include "qgslogger.h"
#define DEFAULT_QUADRANT_SEGMENTS 8
#define CATCH_GEOS(r) \
catch (GEOSException &e) \
{ \
Q_UNUSED(e); \
QgsDebugMsg("GEOS: " + QString( e.what() ) ); \
return r; \
}
class GEOSException
{
public:
GEOSException( const char *theMsg )
{
if ( strcmp( theMsg, "Unknown exception thrown" ) == 0 && lastMsg )
{
delete [] theMsg;
char *aMsg = new char[strlen( lastMsg )+1];
strcpy( aMsg, lastMsg );
msg = aMsg;
}
else
{
msg = theMsg;
lastMsg = msg;
}
}
// copy constructor
GEOSException( const GEOSException &rhs )
{
*this = rhs;
}
~GEOSException()
{
if ( lastMsg == msg )
lastMsg = NULL;
delete [] msg;
}
const char *what()
{
return msg;
}
private:
const char *msg;
static const char *lastMsg;
};
const char *GEOSException::lastMsg = NULL;
static void throwGEOSException( const char *fmt, ... )
{
va_list ap;
va_start( ap, fmt );
size_t buflen = vsnprintf( NULL, 0, fmt, ap );
char *msg = new char[buflen+1];
vsnprintf( msg, buflen + 1, fmt, ap );
va_end( ap );
QgsDebugMsg( QString( "GEOS exception encountered: %1" ).arg( msg ) );
throw GEOSException( msg );
}
static void printGEOSNotice( const char *fmt, ... )
{
#if defined(QGISDEBUG)
va_list ap;
va_start( ap, fmt );
size_t buflen = vsnprintf( NULL, 0, fmt, ap );
char *msg = new char[buflen+1];
vsnprintf( msg, buflen + 1, fmt, ap );
va_end( ap );
QgsDebugMsg( QString( "GEOS notice: " ).arg( msg ) );
delete [] msg;
#endif
}
class GEOSInit
{
public:
GEOSInit()
{
initGEOS( printGEOSNotice, throwGEOSException );
}
~GEOSInit()
{
finishGEOS();
}
};
static GEOSInit geosinit;
#if defined(GEOS_VERSION_MAJOR) && (GEOS_VERSION_MAJOR<3)
#define GEOSGeom_getCoordSeq(g) GEOSGeom_getCoordSeq( (GEOSGeometry *) g )
#define GEOSGetExteriorRing(g) GEOSGetExteriorRing( (GEOSGeometry *)g )
#define GEOSGetNumInteriorRings(g) GEOSGetNumInteriorRings( (GEOSGeometry *)g )
#define GEOSGetInteriorRingN(g,i) GEOSGetInteriorRingN( (GEOSGeometry *)g, i )
#define GEOSDisjoint(g0,g1) GEOSDisjoint( (GEOSGeometry *)g0, (GEOSGeometry*)g1 )
#define GEOSIntersection(g0,g1) GEOSIntersection( (GEOSGeometry*) g0, (GEOSGeometry*)g1 )
#define GEOSBuffer(g, d, s) GEOSBuffer( (GEOSGeometry*) g, d, s )
#define GEOSArea(g, a) GEOSArea( (GEOSGeometry*) g, a )
#define GEOSSimplify(g, t) GEOSSimplify( (GEOSGeometry*) g, t )
#define GEOSGetCentroid(g) GEOSGetCentroid( (GEOSGeometry*) g )
#define GEOSCoordSeq_getSize(cs,n) GEOSCoordSeq_getSize( (GEOSCoordSequence *) cs, n )
#define GEOSCoordSeq_getX(cs,i,x) GEOSCoordSeq_getX( (GEOSCoordSequence *)cs, i, x )
#define GEOSCoordSeq_getY(cs,i,y) GEOSCoordSeq_getY( (GEOSCoordSequence *)cs, i, y )
static GEOSGeometry *createGeosCollection( int typeId, QVector<GEOSGeometry*> geoms );
static GEOSGeometry *cloneGeosGeom( const GEOSGeometry *geom )
{
// for GEOS < 3.0 we have own cloning function
// because when cloning multipart geometries they're copied into more general geometry collection instance
int type = GEOSGeomTypeId(( GEOSGeometry * ) geom );
if ( type == GEOS_MULTIPOINT || type == GEOS_MULTILINESTRING || type == GEOS_MULTIPOLYGON )
{
QVector<GEOSGeometry *> geoms;
try
{
for ( int i = 0; i < GEOSGetNumGeometries(( GEOSGeometry * )geom ); ++i )
geoms << GEOSGeom_clone(( GEOSGeometry * ) GEOSGetGeometryN(( GEOSGeometry * ) geom, i ) );
return createGeosCollection( type, geoms );
}
catch ( GEOSException &e )
{
Q_UNUSED( e );
for ( int i = 0; i < geoms.count(); i++ )
GEOSGeom_destroy( geoms[i] );
return 0;
}
}
else
{
return GEOSGeom_clone(( GEOSGeometry * ) geom );
}
}
#define GEOSGeom_clone(g) cloneGeosGeom(g)
#endif
QgsGeometry::QgsGeometry()
: mGeometry( 0 ),
mGeometrySize( 0 ),
mGeos( 0 ),
mDirtyWkb( FALSE ),
mDirtyGeos( FALSE )
{
}
QgsGeometry::QgsGeometry( QgsGeometry const & rhs )
: mGeometry( 0 ),
mGeometrySize( rhs.mGeometrySize ),
mDirtyWkb( rhs.mDirtyWkb ),
mDirtyGeos( rhs.mDirtyGeos )
{
if ( mGeometrySize && rhs.mGeometry )
{
mGeometry = new unsigned char[mGeometrySize];
memcpy( mGeometry, rhs.mGeometry, mGeometrySize );
}
// deep-copy the GEOS Geometry if appropriate
if ( rhs.mGeos )
{
mGeos = GEOSGeom_clone( rhs.mGeos );
}
else
{
mGeos = 0;
}
}
//! Destructor
QgsGeometry::~QgsGeometry()
{
if ( mGeometry )
{
delete [] mGeometry;
}
if ( mGeos )
{
GEOSGeom_destroy( mGeos );
}
}
static unsigned int getNumGeosPoints( const GEOSGeometry *geom )
{
unsigned int n;
const GEOSCoordSequence *cs = GEOSGeom_getCoordSeq( geom );
GEOSCoordSeq_getSize( cs, &n );
return n;
}
static GEOSGeometry *createGeosPoint( const QgsPoint &point )
{
GEOSCoordSequence *coord = GEOSCoordSeq_create( 1, 2 );
GEOSCoordSeq_setX( coord, 0, point.x() );
GEOSCoordSeq_setY( coord, 0, point.y() );
return GEOSGeom_createPoint( coord );
}
static GEOSCoordSequence *createGeosCoordSequence( const QgsPolyline& points )
{
GEOSCoordSequence *coord = 0;
try
{
coord = GEOSCoordSeq_create( points.count(), 2 );
int i;
for ( i = 0; i < points.count(); i++ )
{
GEOSCoordSeq_setX( coord, i, points[i].x() );
GEOSCoordSeq_setY( coord, i, points[i].y() );
}
return coord;
}
catch ( GEOSException &e )
{
Q_UNUSED( e );
if ( coord )
GEOSCoordSeq_destroy( coord );
throw;
}
}
static GEOSGeometry *createGeosCollection( int typeId, QVector<GEOSGeometry*> geoms )
{
GEOSGeometry **geomarr = new GEOSGeometry*[ geoms.size()];
if ( !geomarr )
return 0;
for ( int i = 0; i < geoms.size(); i++ )
geomarr[i] = geoms[i];
GEOSGeometry *geom = 0;
try
{
geom = GEOSGeom_createCollection( typeId, geomarr, geoms.size() );
}
catch ( GEOSException &e )
{
Q_UNUSED( e );
}
delete [] geomarr;
return geom;
}
static GEOSGeometry *createGeosLineString( const QgsPolyline& polyline )
{
GEOSCoordSequence *coord = 0;
try
{
coord = createGeosCoordSequence( polyline );
return GEOSGeom_createLineString( coord );
}
catch ( GEOSException &e )
{
Q_UNUSED( e );
//MH: for strange reasons, geos3 crashes when removing the coordinate sequence
//if ( coord )
//GEOSCoordSeq_destroy( coord );
return 0;
}
}
static GEOSGeometry *createGeosLinearRing( const QgsPolyline& polyline )
{
GEOSCoordSequence *coord = 0;
if (polyline.count() == 0)
return 0;
try
{
if ( polyline[0] != polyline[polyline.size()-1] )
{
// Ring not closed
QgsPolyline closed( polyline );
closed << closed[0];
coord = createGeosCoordSequence( closed );
}
else
{
coord = createGeosCoordSequence( polyline );
}
return GEOSGeom_createLinearRing( coord );
}
catch ( GEOSException &e )
{
Q_UNUSED( e );
if ( coord )
GEOSCoordSeq_destroy( coord );
return 0;
}
}
static GEOSGeometry *createGeosPolygon( const QVector<GEOSGeometry*> &rings )
{
GEOSGeometry *shell = rings[0];
GEOSGeometry **holes = NULL;
if ( rings.size() > 1 )
{
holes = new GEOSGeometry*[ rings.size()-1 ];
if ( !holes )
return 0;
for ( int i = 0; i < rings.size() - 1; i++ )
holes[i] = rings[i+1];
}
GEOSGeometry *geom = GEOSGeom_createPolygon( shell, holes, rings.size() - 1 );
if ( holes )
delete [] holes;
return geom;
}
static GEOSGeometry *createGeosPolygon( GEOSGeometry *shell )
{
return createGeosPolygon( QVector<GEOSGeometry*>() << shell );
}
static GEOSGeometry *createGeosPolygon( const QgsPolygon& polygon )
{
if ( polygon.count() == 0 )
return 0;
QVector<GEOSGeometry *> geoms;
try
{
for ( int i = 0; i < polygon.count(); i++ )
geoms << createGeosLinearRing( polygon[i] );
return createGeosPolygon( geoms );
}
catch ( GEOSException &e )
{
Q_UNUSED( e );
for ( int i = 0; i < geoms.count(); i++ )
GEOSGeom_destroy( geoms[i] );
return 0;
}
}
static QgsGeometry *fromGeosGeom( GEOSGeometry *geom )
{
if ( !geom )
return 0;
QgsGeometry* g = new QgsGeometry;
g->fromGeos( geom );
return g;
}
QgsGeometry* QgsGeometry::fromWkt( QString wkt )
{
#if defined(GEOS_VERSION_MAJOR) && (GEOS_VERSION_MAJOR>=3)
GEOSWKTReader *reader = GEOSWKTReader_create();;
QgsGeometry *g = fromGeosGeom( GEOSWKTReader_read( reader, wkt.toLocal8Bit().data() ) );
GEOSWKTReader_destroy( reader );
return g;
#else
return fromGeosGeom( GEOSGeomFromWKT( wkt.toLocal8Bit().data() ) );
#endif
}
QgsGeometry* QgsGeometry::fromPoint( const QgsPoint& point )
{
return fromGeosGeom( createGeosPoint( point ) );
}
QgsGeometry* QgsGeometry::fromPolyline( const QgsPolyline& polyline )
{
return fromGeosGeom( createGeosLineString( polyline ) );
}
QgsGeometry* QgsGeometry::fromPolygon( const QgsPolygon& polygon )
{
return fromGeosGeom( createGeosPolygon( polygon ) );
}
QgsGeometry* QgsGeometry::fromMultiPoint( const QgsMultiPoint& multipoint )
{
QVector<GEOSGeometry *> geoms;
try
{
for ( int i = 0; i < multipoint.size(); ++i )
{
geoms << createGeosPoint( multipoint[i] );
}
return fromGeosGeom( createGeosCollection( GEOS_MULTIPOINT, geoms ) );
}
catch ( GEOSException &e )
{
Q_UNUSED( e );
for ( int i = 0; i < geoms.size(); ++i )
GEOSGeom_destroy( geoms[i] );
return 0;
}
}
QgsGeometry* QgsGeometry::fromMultiPolyline( const QgsMultiPolyline& multiline )
{
QVector<GEOSGeometry *> geoms;
try
{
for ( int i = 0; i < multiline.count(); i++ )
geoms << createGeosLineString( multiline[i] );
return fromGeosGeom( createGeosCollection( GEOS_MULTILINESTRING, geoms ) );
}
catch ( GEOSException &e )
{
Q_UNUSED( e );
for ( int i = 0; i < geoms.count(); i++ )
GEOSGeom_destroy( geoms[i] );
return 0;
}
}
QgsGeometry* QgsGeometry::fromMultiPolygon( const QgsMultiPolygon& multipoly )
{
if ( multipoly.count() == 0 )
return 0;
QVector<GEOSGeometry *> geoms;
try
{
for ( int i = 0; i < multipoly.count(); i++ )
geoms << createGeosPolygon( multipoly[i] );
return fromGeosGeom( createGeosCollection( GEOS_MULTIPOLYGON, geoms ) );
}
catch ( GEOSException &e )
{
Q_UNUSED( e );
for ( int i = 0; i < geoms.count(); i++ )
GEOSGeom_destroy( geoms[i] );
return 0;
}
}
QgsGeometry* QgsGeometry::fromRect( const QgsRectangle& rect )
{
QgsPolyline ring;
ring.append( QgsPoint( rect.xMinimum(), rect.yMinimum() ) );
ring.append( QgsPoint( rect.xMaximum(), rect.yMinimum() ) );
ring.append( QgsPoint( rect.xMaximum(), rect.yMaximum() ) );
ring.append( QgsPoint( rect.xMinimum(), rect.yMaximum() ) );
ring.append( QgsPoint( rect.xMinimum(), rect.yMinimum() ) );
QgsPolygon polygon;
polygon.append( ring );
return fromPolygon( polygon );
}
QgsGeometry & QgsGeometry::operator=( QgsGeometry const & rhs )
{
if ( &rhs == this )
{
return *this;
}
// remove old geometry if it exists
if ( mGeometry )
{
delete [] mGeometry;
mGeometry = 0;
}
mGeometrySize = rhs.mGeometrySize;
// deep-copy the GEOS Geometry if appropriate
mGeos = rhs.mGeos ? GEOSGeom_clone( rhs.mGeos ) : 0;
mDirtyGeos = rhs.mDirtyGeos;
mDirtyWkb = rhs.mDirtyWkb;
if ( mGeometrySize && rhs.mGeometry )
{
mGeometry = new unsigned char[mGeometrySize];
memcpy( mGeometry, rhs.mGeometry, mGeometrySize );
}
return *this;
} // QgsGeometry::operator=( QgsGeometry const & rhs )
void QgsGeometry::fromWkb( unsigned char * wkb, size_t length )
{
// delete any existing WKB geometry before assigning new one
if ( mGeometry )
{
delete [] mGeometry;
mGeometry = 0;
}
if ( mGeos )
{
GEOSGeom_destroy( mGeos );
mGeos = 0;
}
mGeometry = wkb;
mGeometrySize = length;
mDirtyWkb = FALSE;
mDirtyGeos = TRUE;
}
unsigned char * QgsGeometry::asWkb()
{
if ( mDirtyWkb )
{
// convert from GEOS
exportGeosToWkb();
}
return mGeometry;
}
size_t QgsGeometry::wkbSize()
{
if ( mDirtyWkb )
{
exportGeosToWkb();
}
return mGeometrySize;
}
QGis::WkbType QgsGeometry::wkbType()
{
unsigned char *geom = asWkb(); // ensure that wkb representation exists
if ( geom )
{
unsigned int wkbType;
memcpy( &wkbType, ( geom + 1 ), sizeof( wkbType ) );
return ( QGis::WkbType ) wkbType;
}
else
{
return QGis::WKBUnknown;
}
}
QGis::GeometryType QgsGeometry::type()
{
if ( mDirtyWkb )
{
// convert from GEOS
exportGeosToWkb();
}
QGis::WkbType type = wkbType();
if ( type == QGis::WKBPoint || type == QGis::WKBPoint25D ||
type == QGis::WKBMultiPoint || type == QGis::WKBMultiPoint25D )
return QGis::Point;
if ( type == QGis::WKBLineString || type == QGis::WKBLineString25D ||
type == QGis::WKBMultiLineString || type == QGis::WKBMultiLineString25D )
return QGis::Line;
if ( type == QGis::WKBPolygon || type == QGis::WKBPolygon25D ||
type == QGis::WKBMultiPolygon || type == QGis::WKBMultiPolygon25D )
return QGis::Polygon;
return QGis::UnknownGeometry;
}
bool QgsGeometry::isMultipart()
{
if ( mDirtyWkb )
{
// convert from GEOS
exportGeosToWkb();
}
QGis::WkbType type = wkbType();
if ( type == QGis::WKBMultiPoint ||
type == QGis::WKBMultiPoint25D ||
type == QGis::WKBMultiLineString ||
type == QGis::WKBMultiLineString25D ||
type == QGis::WKBMultiPolygon ||
type == QGis::WKBMultiPolygon25D )
return true;
return false;
}
void QgsGeometry::fromGeos( GEOSGeometry* geos )
{
// TODO - make this more heap-friendly
if ( mGeos )
{
GEOSGeom_destroy( mGeos );
mGeos = 0;
}
if ( mGeometry )
{
delete [] mGeometry;
mGeometry = 0;
}
mGeos = geos;
mDirtyWkb = TRUE;
mDirtyGeos = FALSE;
}
QgsPoint QgsGeometry::closestVertex( const QgsPoint& point, int& atVertex, int& beforeVertex, int& afterVertex, double& sqrDist )
{
// TODO: implement with GEOS
if ( mDirtyWkb )
{
exportGeosToWkb();
}
if ( !mGeometry )
{
QgsDebugMsg( "WKB geometry not available!" );
return QgsPoint( 0, 0 );
}
int vertexnr = -1;
int vertexcounter = 0;
QGis::WkbType wkbType;
double actdist = std::numeric_limits<double>::max();
double x = 0;
double y = 0;
double *tempx, *tempy;
memcpy( &wkbType, ( mGeometry + 1 ), sizeof( int ) );
beforeVertex = -1;
afterVertex = -1;
bool hasZValue = false;
switch ( wkbType )
{
case QGis::WKBPoint25D:
case QGis::WKBPoint:
{
x = *(( double * )( mGeometry + 5 ) );
y = *(( double * )( mGeometry + 5 + sizeof( double ) ) );
actdist = point.sqrDist( x, y );
vertexnr = 0;
break;
}
case QGis::WKBLineString25D:
hasZValue = true;
// fall-through
case QGis::WKBLineString:
{
unsigned char* ptr = mGeometry + 5;
int* npoints = ( int* )ptr;
ptr += sizeof( int );
for ( int index = 0;index < *npoints;++index )
{
tempx = ( double* )ptr;
ptr += sizeof( double );
tempy = ( double* )ptr;
if ( point.sqrDist( *tempx, *tempy ) < actdist )
{
x = *tempx;
y = *tempy;
actdist = point.sqrDist( *tempx, *tempy );
vertexnr = index;
if ( index == 0 )//assign the rubber band indices
{
beforeVertex = -1;
}
else
{
beforeVertex = index - 1;
}
if ( index == ( *npoints - 1 ) )
{
afterVertex = -1;
}
else
{
afterVertex = index + 1;
}
}
ptr += sizeof( double );
if ( hasZValue ) //skip z-coordinate for 25D geometries
{
ptr += sizeof( double );
}
}
break;
}
case QGis::WKBPolygon25D:
hasZValue = true;
case QGis::WKBPolygon:
{
int* nrings = ( int* )( mGeometry + 5 );
int* npoints;
unsigned char* ptr = mGeometry + 9;
for ( int index = 0;index < *nrings;++index )
{
npoints = ( int* )ptr;
ptr += sizeof( int );
for ( int index2 = 0;index2 < *npoints;++index2 )
{
tempx = ( double* )ptr;
ptr += sizeof( double );
tempy = ( double* )ptr;
if ( point.sqrDist( *tempx, *tempy ) < actdist )
{
x = *tempx;
y = *tempy;
actdist = point.sqrDist( *tempx, *tempy );
vertexnr = vertexcounter;
//assign the rubber band indices
if ( index2 == 0 )
{
beforeVertex = vertexcounter + ( *npoints - 2 );
afterVertex = vertexcounter + 1;
}
else if ( index2 == ( *npoints - 1 ) )
{
beforeVertex = vertexcounter - 1;
afterVertex = vertexcounter - ( *npoints - 2 );
}
else
{
beforeVertex = vertexcounter - 1;
afterVertex = vertexcounter + 1;
}
}
ptr += sizeof( double );
if ( hasZValue ) //skip z-coordinate for 25D geometries
{
ptr += sizeof( double );
}
++vertexcounter;
}
}
break;
}
case QGis::WKBMultiPoint25D:
hasZValue = true;
case QGis::WKBMultiPoint:
{
unsigned char* ptr = mGeometry + 5;
int* npoints = ( int* )ptr;
ptr += sizeof( int );
for ( int index = 0;index < *npoints;++index )
{
ptr += ( 1 + sizeof( int ) ); //skip endian and point type
tempx = ( double* )ptr;
tempy = ( double* )( ptr + sizeof( double ) );
if ( point.sqrDist( *tempx, *tempy ) < actdist )
{
x = *tempx;
y = *tempy;
actdist = point.sqrDist( *tempx, *tempy );
vertexnr = index;
}
ptr += ( 2 * sizeof( double ) );
if ( hasZValue ) //skip z-coordinate for 25D geometries
{
ptr += sizeof( double );
}
}
break;
}
case QGis::WKBMultiLineString25D:
hasZValue = true;
case QGis::WKBMultiLineString:
{
unsigned char* ptr = mGeometry + 5;
int* nlines = ( int* )ptr;
int* npoints = 0;
ptr += sizeof( int );
for ( int index = 0;index < *nlines;++index )
{
ptr += ( sizeof( int ) + 1 );
npoints = ( int* )ptr;
ptr += sizeof( int );
for ( int index2 = 0;index2 < *npoints;++index2 )
{
tempx = ( double* )ptr;
ptr += sizeof( double );
tempy = ( double* )ptr;
ptr += sizeof( double );
if ( point.sqrDist( *tempx, *tempy ) < actdist )
{
x = *tempx;
y = *tempy;
actdist = point.sqrDist( *tempx, *tempy );
vertexnr = vertexcounter;
if ( index2 == 0 )//assign the rubber band indices
{
beforeVertex = -1;
}
else
{
beforeVertex = vertexnr - 1;
}
if ( index2 == ( *npoints ) - 1 )
{
afterVertex = -1;
}
else
{
afterVertex = vertexnr + 1;
}
}
if ( hasZValue ) //skip z-coordinate for 25D geometries
{
ptr += sizeof( double );
}
++vertexcounter;
}
}
break;
}
case QGis::WKBMultiPolygon25D:
hasZValue = true;
case QGis::WKBMultiPolygon:
{
unsigned char* ptr = mGeometry + 5;
int* npolys = ( int* )ptr;
int* nrings;
int* npoints;
ptr += sizeof( int );
for ( int index = 0;index < *npolys;++index )
{
ptr += ( 1 + sizeof( int ) ); //skip endian and polygon type
nrings = ( int* )ptr;
ptr += sizeof( int );
for ( int index2 = 0;index2 < *nrings;++index2 )
{
npoints = ( int* )ptr;
ptr += sizeof( int );
for ( int index3 = 0;index3 < *npoints;++index3 )
{
tempx = ( double* )ptr;
ptr += sizeof( double );
tempy = ( double* )ptr;
if ( point.sqrDist( *tempx, *tempy ) < actdist )
{
x = *tempx;
y = *tempy;
actdist = point.sqrDist( *tempx, *tempy );
vertexnr = vertexcounter;
//assign the rubber band indices
if ( index3 == 0 )
{
beforeVertex = vertexcounter + ( *npoints - 2 );
afterVertex = vertexcounter + 1;
}
else if ( index3 == ( *npoints - 1 ) )
{
beforeVertex = vertexcounter - 1;
afterVertex = vertexcounter - ( *npoints - 2 );
}
else
{
beforeVertex = vertexcounter - 1;
afterVertex = vertexcounter + 1;
}
}
ptr += sizeof( double );
if ( hasZValue ) //skip z-coordinate for 25D geometries
{
ptr += sizeof( double );
}
++vertexcounter;
}
}
}
break;
}
default:
break;
}
sqrDist = actdist;
atVertex = vertexnr;
return QgsPoint( x, y );
}
void QgsGeometry::adjacentVertices( int atVertex, int& beforeVertex, int& afterVertex )
{
// TODO: implement with GEOS
if ( mDirtyWkb )
{
exportGeosToWkb();
}
beforeVertex = -1;
afterVertex = -1;
if ( !mGeometry )
{
QgsDebugMsg( "WKB geometry not available!" );
return;
}
int vertexcounter = 0;
QGis::WkbType wkbType;
bool hasZValue = false;
memcpy( &wkbType, ( mGeometry + 1 ), sizeof( int ) );
switch ( wkbType )
{
case QGis::WKBPoint:
{
// NOOP - Points do not have adjacent verticies
break;
}
case QGis::WKBLineString25D:
case QGis::WKBLineString:
{
unsigned char* ptr = mGeometry + 5;
int* npoints = ( int* ) ptr;
const int index = atVertex;
// assign the rubber band indices
if ( index == 0 )
{
beforeVertex = -1;
}
else
{
beforeVertex = index - 1;
}
if ( index == ( *npoints - 1 ) )
{
afterVertex = -1;