C++ Match::hasArea方法代码示例

    void testPointInPolygon()
    {
      QgsPointLocator loc( mVL );
      QgsPointLocator::MatchList mValid = loc.pointInPolygon( QgsPointXY( 0.8, 0.8 ) );
      QCOMPARE( mValid.count(), 1 );
      QgsPointLocator::Match m = mValid[0];
      QVERIFY( m.isValid() );
      QVERIFY( m.hasArea() );
      QCOMPARE( m.layer(), mVL );
      QCOMPARE( m.featureId(), ( QgsFeatureId )1 );

      QgsPointLocator::MatchList mInvalid = loc.pointInPolygon( QgsPointXY( 0, 0 ) );
      QCOMPARE( mInvalid.count(), 0 );
    }

void QgsMapToolOffsetCurve::canvasReleaseEvent( QgsMapMouseEvent *e )
{
  mCtrlHeldOnFirstClick = false;

  if ( e->button() == Qt::RightButton )
  {
    cancel();
    return;
  }

  if ( mOriginalGeometry.isNull() )
  {
    // first click, get feature to modify
    deleteRubberBandAndGeometry();
    mGeometryModified = false;

    QgsPointLocator::Match match = mCanvas->snappingUtils()->snapToCurrentLayer( e->pos(),
                                   QgsPointLocator::Types( QgsPointLocator::Edge | QgsPointLocator::Area ) );

    if ( ( match.hasEdge() || match.hasArea() ) && match.layer() )
    {
      mLayer = match.layer();
      QgsFeature fet;
      if ( match.layer()->getFeatures( QgsFeatureRequest( match.featureId() ) ).nextFeature( fet ) )
      {
        mCtrlHeldOnFirstClick = ( e->modifiers() & Qt::ControlModifier ); //no geometry modification if ctrl is pressed
        prepareGeometry( match, fet );
        mRubberBand = createRubberBand();
        if ( mRubberBand )
        {
          mRubberBand->setToGeometry( mManipulatedGeometry, match.layer() );
        }
        mModifiedFeature = fet.id();
        createUserInputWidget();

        bool hasZ = QgsWkbTypes::hasZ( mLayer->wkbType() );
        bool hasM = QgsWkbTypes::hasZ( mLayer->wkbType() );
        if ( hasZ || hasM )
        {
          emit messageEmitted( QStringLiteral( "layer %1 has %2%3%4 geometry. %2%3%4 values be set to 0 when using offset tool." )
                               .arg( mLayer->name() )
                               .arg( hasZ ? "Z" : "" )
                               .arg( hasZ && hasM ? "/" : "" )
                               .arg( hasM ? "M" : "" )
                               , Qgis::Warning );
        }
      }
    }

    if ( mOriginalGeometry.isNull() )
    {
      emit messageEmitted( tr( "Could not find a nearby feature in any vector layer." ) );
      cancel();
      notifyNotVectorLayer();
    }
  }
  else
  {
    // second click - apply changes
    double offset = calculateOffset( e->snapPoint() );
    applyOffset( offset, e->modifiers() );
  }
}

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.........