C++ Match::vertexIndex方法代码示例

 void testNearestVertex()
 {
   QgsPointLocator loc( mVL );
   QgsPointXY pt( 2, 2 );
   QgsPointLocator::Match m = loc.nearestVertex( pt, 999 );
   QVERIFY( m.isValid() );
   QVERIFY( m.hasVertex() );
   QCOMPARE( m.layer(), mVL );
   QCOMPARE( m.featureId(), ( QgsFeatureId )1 );
   QCOMPARE( m.point(), QgsPointXY( 1, 1 ) );
   QCOMPARE( m.distance(), std::sqrt( 2.0 ) );
   QCOMPARE( m.vertexIndex(), 2 );
 }

 void testNearestEdge()
 {
   QgsPointLocator loc( mVL );
   QgsPointXY pt( 1.1, 0.5 );
   QgsPointLocator::Match m = loc.nearestEdge( pt, 999 );
   QVERIFY( m.isValid() );
   QVERIFY( m.hasEdge() );
   QCOMPARE( m.layer(), mVL );
   QCOMPARE( m.featureId(), ( QgsFeatureId )1 );
   QCOMPARE( m.point(), QgsPointXY( 1, 0.5 ) );
   QCOMPARE( m.distance(), 0.1 );
   QCOMPARE( m.vertexIndex(), 1 );
   QgsPointXY pt1, pt2;
   m.edgePoints( pt1, pt2 );
   QCOMPARE( pt1, QgsPointXY( 1, 0 ) );
   QCOMPARE( pt2, QgsPointXY( 1, 1 ) );
 }

int QgsMapToolCapture::fetchLayerPoint( const QgsPointLocator::Match &match, QgsPoint &layerPoint )
{
  QgsVectorLayer *vlayer = qobject_cast<QgsVectorLayer *>( mCanvas->currentLayer() );
  QgsVectorLayer *sourceLayer = match.layer();
  if ( match.isValid() && match.hasVertex() && sourceLayer &&
       ( sourceLayer->crs() == vlayer->crs() ) )
  {
    QgsFeature f;
    QgsFeatureRequest request;
    request.setFilterFid( match.featureId() );
    bool fetched = match.layer()->getFeatures( request ).nextFeature( f );
    if ( fetched )
    {
      QgsVertexId vId;
      if ( !f.geometry().vertexIdFromVertexNr( match.vertexIndex(), vId ) )
        return 2;

      layerPoint = f.geometry().constGet()->vertexAt( vId );

      // ZM support depends on the target layer
      if ( !QgsWkbTypes::hasZ( vlayer->wkbType() ) )
      {
        layerPoint.dropZValue();
      }

      if ( !QgsWkbTypes::hasM( vlayer->wkbType() ) )
      {
        layerPoint.dropMValue();
      }

      return 0;
    }
    else
    {
      return 2;
    }
  }
  else
  {
    return 1;
  }
}

QgsPoint QgsMapToolCapture::mapPoint( const QgsMapMouseEvent &e ) const
{
  QgsPoint newPoint = mapPoint( e.mapPoint() );

  // set z value from snapped point if necessary
  if ( QgsWkbTypes::hasZ( newPoint.wkbType() ) )
  {
    // if snapped, z dimension is taken from the corresponding snapped
    // point.
    if ( e.isSnapped() )
    {
      const QgsPointLocator::Match match = e.mapPointMatch();

      if ( match.layer() && QgsWkbTypes::hasZ( match.layer()->wkbType() ) )
      {
        const QgsFeature ft = match.layer()->getFeature( match.featureId() );
        newPoint.setZ( ft.geometry().vertexAt( match.vertexIndex() ).z() );
      }
    }
  }

  return newPoint;
}

QgsGeometry* QgsMapToolDeletePart::partUnderPoint( QPoint point, QgsFeatureId& fid, int& partNum )
{
  QgsFeature f;
  QgsGeometry* geomPart = new QgsGeometry();

  switch ( vlayer->geometryType() )
  {
    case QGis::Point:
    case QGis::Line:
    {
      QgsPointLocator::Match match = mCanvas->snappingUtils()->snapToCurrentLayer( point, QgsPointLocator::Vertex | QgsPointLocator::Edge );
      if ( !match.isValid() )
        return geomPart;

      int snapVertex = match.vertexIndex();
      vlayer->getFeatures( QgsFeatureRequest().setFilterFid( match.featureId() ) ).nextFeature( f );
      const QgsGeometry* g = f.constGeometry();
      if ( !g->isMultipart() )
      {
        fid = match.featureId();
        delete geomPart;
        return QgsGeometry::fromPoint( match.point() );
      }
      if ( g->wkbType() == QGis::WKBMultiPoint || g->wkbType() == QGis::WKBMultiPoint25D )
      {
        fid = match.featureId();
        partNum = snapVertex;
        delete geomPart;
        return QgsGeometry::fromPoint( match.point() );
      }
      if ( g->wkbType() == QGis::WKBMultiLineString || g->wkbType() == QGis::WKBMultiLineString25D )
      {
        QgsMultiPolyline mline = g->asMultiPolyline();
        for ( int part = 0; part < mline.count(); part++ )
        {
          if ( snapVertex < mline[part].count() )
          {
            fid = match.featureId();
            partNum = part;
            delete geomPart;
            return QgsGeometry::fromPolyline( mline[part] );
          }
          snapVertex -= mline[part].count();
        }
      }
      break;
    }
    case QGis::Polygon:
    {
      QgsPoint layerCoords = toLayerCoordinates( vlayer, point );
      double searchRadius = QgsTolerance::vertexSearchRadius( mCanvas->currentLayer(), mCanvas->mapSettings() );
      QgsRectangle selectRect( layerCoords.x() - searchRadius, layerCoords.y() - searchRadius,
                               layerCoords.x() + searchRadius, layerCoords.y() + searchRadius );
      QgsFeatureIterator fit = vlayer->getFeatures( QgsFeatureRequest().setFilterRect( selectRect ) );
      fit.nextFeature( f );
      const QgsGeometry* g = f.constGeometry();
      if ( !g )
        return geomPart;
      if ( !g->isMultipart() )
      {
        fid = f.id();
        return geomPart;
      }
      QgsMultiPolygon mpolygon = g->asMultiPolygon();
      for ( int part = 0; part < mpolygon.count(); part++ ) // go through the polygons
      {
        const QgsPolygon& polygon = mpolygon[part];
        QgsGeometry* partGeo = QgsGeometry::fromPolygon( polygon );
        if ( partGeo->contains( &layerCoords ) )
        {
          fid = f.id();
          partNum = part;
          delete geomPart;
          return partGeo;
        }
        delete partGeo;
      }
      break;
    }
    default:
    {
      break;
    }
  }
  return geomPart;
}

QgsGeometry QgsMapToolDeletePart::partUnderPoint( QPoint point, QgsFeatureId &fid, int &partNum )
{
  QgsFeature f;
  QgsGeometry geomPart;

  switch ( vlayer->geometryType() )
  {
    case QgsWkbTypes::PointGeometry:
    case QgsWkbTypes::LineGeometry:
    {
      QgsPointLocator::Match match = mCanvas->snappingUtils()->snapToCurrentLayer( point, QgsPointLocator::Types( QgsPointLocator::Vertex | QgsPointLocator::Edge ) );
      if ( !match.isValid() )
        return geomPart;

      int snapVertex = match.vertexIndex();
      vlayer->getFeatures( QgsFeatureRequest().setFilterFid( match.featureId() ) ).nextFeature( f );
      QgsGeometry g = f.geometry();
      if ( !g.isMultipart() )
      {
        fid = match.featureId();
        return QgsGeometry::fromPointXY( match.point() );
      }
      else if ( QgsWkbTypes::geometryType( g.wkbType() ) == QgsWkbTypes::PointGeometry )
      {
        fid = match.featureId();
        partNum = snapVertex;
        return QgsGeometry::fromPointXY( match.point() );
      }
      else if ( QgsWkbTypes::geometryType( g.wkbType() ) == QgsWkbTypes::LineGeometry )
      {
        QgsMultiPolylineXY mline = g.asMultiPolyline();
        for ( int part = 0; part < mline.count(); part++ )
        {
          if ( snapVertex < mline[part].count() )
          {
            fid = match.featureId();
            partNum = part;
            return QgsGeometry::fromPolylineXY( mline[part] );
          }
          snapVertex -= mline[part].count();
        }
      }
      break;
    }
    case QgsWkbTypes::PolygonGeometry:
    {
      QgsPointLocator::Match match = mCanvas->snappingUtils()->snapToCurrentLayer( point, QgsPointLocator::Area );
      if ( !match.isValid() )
        return geomPart;

      vlayer->getFeatures( QgsFeatureRequest().setFilterFid( match.featureId() ) ).nextFeature( f );
      QgsGeometry g = f.geometry();
      if ( g.isNull() )
        return geomPart;

      QgsPointXY layerCoords = toLayerCoordinates( vlayer, point );

      if ( !g.isMultipart() )
      {
        fid = f.id();
        return geomPart;
      }
      QgsMultiPolygonXY mpolygon = g.asMultiPolygon();
      for ( int part = 0; part < mpolygon.count(); part++ ) // go through the polygons
      {
        const QgsPolygonXY &polygon = mpolygon[part];
        QgsGeometry partGeo = QgsGeometry::fromPolygonXY( polygon );
        if ( partGeo.contains( &layerCoords ) )
        {
          fid = f.id();
          partNum = part;
          return partGeo;
        }
      }
      break;
    }
    default:
    {
      break;
    }
  }
  return geomPart;
}

void QgsMapToolOffsetCurve::prepareGeometry( const QgsPointLocator::Match &match, QgsFeature &snappedFeature )
{
  QgsVectorLayer *vl = match.layer();
  if ( !vl )
  {
    return;
  }

  mOriginalGeometry = QgsGeometry();
  mManipulatedGeometry = QgsGeometry();
  mModifiedPart = -1;
  mModifiedRing = -1;

  //assign feature part by vertex number (snap to vertex) or by before vertex number (snap to segment)
  QgsGeometry geom = snappedFeature.geometry();
  if ( geom.isNull() )
  {
    return;
  }
  mOriginalGeometry = geom;

  QgsWkbTypes::Type geomType = geom.wkbType();
  if ( QgsWkbTypes::geometryType( geomType ) == QgsWkbTypes::LineGeometry )
  {
    if ( !match.hasEdge() )
    {
      return;
    }
    if ( !geom.isMultipart() )
    {
      mManipulatedGeometry = geom;
    }
    else
    {
      int vertex = match.vertexIndex();
      QgsVertexId vertexId;
      geom.vertexIdFromVertexNr( vertex, vertexId );
      mModifiedPart = vertexId.part;

      QgsMultiPolylineXY multiLine = geom.asMultiPolyline();
      mManipulatedGeometry = QgsGeometry::fromPolylineXY( multiLine.at( mModifiedPart ) );
    }
  }
  else if ( QgsWkbTypes::geometryType( geomType ) == QgsWkbTypes::PolygonGeometry )
  {
    if ( !match.hasEdge() && match.hasArea() )
    {
      if ( !geom.isMultipart() )
      {
        mManipulatedGeometry = geom;
      }
      else
      {
        // get the correct part
        QgsMultiPolygonXY mpolygon = geom.asMultiPolygon();
        for ( int part = 0; part < mpolygon.count(); part++ ) // go through the polygons
        {
          const QgsPolygonXY &polygon = mpolygon[part];
          QgsGeometry partGeo = QgsGeometry::fromPolygonXY( polygon );
          const QgsPointXY layerCoords = match.point();
          if ( partGeo.contains( &layerCoords ) )
          {
            mModifiedPart = part;
            mManipulatedGeometry = partGeo;
          }
        }
      }
    }
    else if ( match.hasEdge() )
    {
      int vertex = match.vertexIndex();
      QgsVertexId vertexId;
      geom.vertexIdFromVertexNr( vertex, vertexId );
      QgsDebugMsg( QStringLiteral( "%1" ).arg( vertexId.ring ) );

      if ( !geom.isMultipart() )
      {
        QgsPolygonXY poly = geom.asPolygon();
        // if has rings
        if ( poly.count() > 0 )
        {
          mModifiedRing = vertexId.ring;
          mManipulatedGeometry = QgsGeometry::fromPolygonXY( QgsPolygonXY() << poly.at( mModifiedRing ) );
        }
        else
        {
          mManipulatedGeometry = QgsGeometry::fromPolygonXY( poly );
        }

      }
      else
      {
        mModifiedPart = vertexId.part;
        // get part, get ring
        QgsMultiPolygonXY multiPoly = geom.asMultiPolygon();
        // if has rings
        if ( multiPoly.at( mModifiedPart ).count() > 0 )
        {
          mModifiedRing = vertexId.ring;
          mManipulatedGeometry = QgsGeometry::fromPolygonXY( QgsPolygonXY() << multiPoly.at( mModifiedPart ).at( mModifiedRing ) );
//.........这里部分代码省略.........