C++ qgspointlocator::Match类代码示例

 bool acceptMatch( const QgsPointLocator::Match& match ) { return match.point() != mPoint; }

QgsPoint QgsMeasureTool::snapPoint( const QPoint& p )
{
  QgsPointLocator::Match m = mCanvas->snappingUtils()->snapToMap( p );
  return m.isValid() ? m.point() : mCanvas->getCoordinateTransform()->toMapCoordinates( p );
}

    void testLayerUpdates()
    {

      QgsPointLocator loc( mVL );

      QgsPointLocator::Match mAddV0 = loc.nearestVertex( QgsPoint( 12, 12 ), 999 );
      QVERIFY( mAddV0.isValid() );
      QCOMPARE( mAddV0.point(), QgsPoint( 1, 1 ) );

      mVL->startEditing();

      // add a new feature
      QgsFeature ff( 0 );
      QgsPolygon polygon;
      QgsPolyline polyline;
      polyline << QgsPoint( 10, 11 ) << QgsPoint( 11, 10 ) << QgsPoint( 11, 11 ) << QgsPoint( 10, 11 );
      polygon << polyline;
      ff.setGeometry( QgsGeometry::fromPolygon( polygon ) );
      QgsFeatureList flist;
      flist << ff;
      bool resA = mVL->addFeature( ff );
      QVERIFY( resA );

      // verify it is added in the point locator
      QgsPointLocator::Match mAddV = loc.nearestVertex( QgsPoint( 12, 12 ), 999 );
      QVERIFY( mAddV.isValid() );
      QCOMPARE( mAddV.point(), QgsPoint( 11, 11 ) );
      QgsPointLocator::Match mAddE = loc.nearestEdge( QgsPoint( 11.1, 10.5 ), 999 );
      QVERIFY( mAddE.isValid() );
      QCOMPARE( mAddE.point(), QgsPoint( 11, 10.5 ) );
      QgsPointLocator::MatchList mAddA = loc.pointInPolygon( QgsPoint( 10.8, 10.8 ) );
      QVERIFY( mAddA.count() == 1 );

      // change geometry
      QgsGeometry* newGeom = new QgsGeometry( *ff.constGeometry() );
      newGeom->moveVertex( 10, 10, 2 ); // change 11,11 to 10,10
      mVL->changeGeometry( ff.id(), newGeom );
      delete newGeom;

      // verify it is changed in the point locator
      QgsPointLocator::Match mChV = loc.nearestVertex( QgsPoint( 12, 12 ), 999 );
      QVERIFY( mChV.isValid() );
      QVERIFY( mChV.point() != QgsPoint( 11, 11 ) ); // that point does not exist anymore
      mChV = loc.nearestVertex( QgsPoint( 9, 9 ), 999 );
      QVERIFY( mChV.isValid() );
      QVERIFY( mChV.point() == QgsPoint( 10, 10 ) ); // updated point

      // delete feature
      bool resD = mVL->deleteFeature( ff.id() );
      QVERIFY( resD );

      // verify it is deleted from the point locator
      QgsPointLocator::Match mDelV = loc.nearestVertex( QgsPoint( 12, 12 ), 999 );
      QVERIFY( mDelV.isValid() );
      QCOMPARE( mDelV.point(), QgsPoint( 1, 1 ) );

      mVL->rollBack();
    }

 bool acceptMatch( const QgsPointLocator::Match& m ) override {
     return m.hasEdge();
 }

QgsCadUtils::AlignMapPointOutput QgsCadUtils::alignMapPoint( const QgsPointXY &originalMapPoint, const QgsCadUtils::AlignMapPointContext &ctx )
{
  QgsCadUtils::AlignMapPointOutput res;
  res.valid = true;
  res.softLockCommonAngle = -1;

  // try to snap to anything
  QgsPointLocator::Match snapMatch = ctx.snappingUtils->snapToMap( originalMapPoint );
  QgsPointXY point = snapMatch.isValid() ? snapMatch.point() : originalMapPoint;

  // try to snap explicitly to a segment - useful for some constraints
  QgsPointXY edgePt0, edgePt1;
  EdgesOnlyFilter edgesOnlyFilter;
  QgsPointLocator::Match edgeMatch = ctx.snappingUtils->snapToMap( originalMapPoint, &edgesOnlyFilter );
  if ( edgeMatch.hasEdge() )
    edgeMatch.edgePoints( edgePt0, edgePt1 );

  res.edgeMatch = edgeMatch;

  QgsPointXY previousPt, penultimatePt;
  if ( ctx.cadPointList.count() >= 2 )
    previousPt = ctx.cadPointList.at( 1 );
  if ( ctx.cadPointList.count() >= 3 )
    penultimatePt = ctx.cadPointList.at( 2 );

  // *****************************
  // ---- X constraint
  if ( ctx.xConstraint.locked )
  {
    if ( !ctx.xConstraint.relative )
    {
      point.setX( ctx.xConstraint.value );
    }
    else if ( ctx.cadPointList.count() >= 2 )
    {
      point.setX( previousPt.x() + ctx.xConstraint.value );
    }
    if ( edgeMatch.hasEdge() && !ctx.yConstraint.locked )
    {
      // intersect with snapped segment line at X ccordinate
      const double dx = edgePt1.x() - edgePt0.x();
      if ( dx == 0 )
      {
        point.setY( edgePt0.y() );
      }
      else
      {
        const double dy = edgePt1.y() - edgePt0.y();
        point.setY( edgePt0.y() + ( dy * ( point.x() - edgePt0.x() ) ) / dx );
      }
    }
  }

  // *****************************
  // ---- Y constraint
  if ( ctx.yConstraint.locked )
  {
    if ( !ctx.yConstraint.relative )
    {
      point.setY( ctx.yConstraint.value );
    }
    else if ( ctx.cadPointList.count() >= 2 )
    {
      point.setY( previousPt.y() + ctx.yConstraint.value );
    }
    if ( edgeMatch.hasEdge() && !ctx.xConstraint.locked )
    {
      // intersect with snapped segment line at Y ccordinate
      const double dy = edgePt1.y() - edgePt0.y();
      if ( dy == 0 )
      {
        point.setX( edgePt0.x() );
      }
      else
      {
        const double dx = edgePt1.x() - edgePt0.x();
        point.setX( edgePt0.x() + ( dx * ( point.y() - edgePt0.y() ) ) / dy );
      }
    }
  }

  // *****************************
  // ---- Common Angle constraint
  if ( !ctx.angleConstraint.locked && ctx.cadPointList.count() >= 2 && ctx.commonAngleConstraint.locked && ctx.commonAngleConstraint.value != 0 )
  {
    double commonAngle = ctx.commonAngleConstraint.value * M_PI / 180;
    // see if soft common angle constraint should be performed
    // only if not in HardLock mode
    double softAngle = std::atan2( point.y() - previousPt.y(),
                                   point.x() - previousPt.x() );
    double deltaAngle = 0;
    if ( ctx.commonAngleConstraint.relative && ctx.cadPointList.count() >= 3 )
    {
      // compute the angle relative to the last segment (0° is aligned with last segment)
      deltaAngle = std::atan2( previousPt.y() - penultimatePt.y(),
                               previousPt.x() - penultimatePt.x() );
      softAngle -= deltaAngle;
    }
    int quo = std::round( softAngle / commonAngle );
    if ( std::fabs( softAngle - quo * commonAngle ) * 180.0 * M_1_PI <= SOFT_CONSTRAINT_TOLERANCE_DEGREES )
//.........这里部分代码省略.........

 bool acceptMatch( const QgsPointLocator::Match& match )
 {
   QgsPoint p1, p2;
   match.edgePoints( p1, p2 );
   return !( p1 == mP1 && p2 == mP2 ) && !( p1 == mP2 && p2 == mP1 );
 }

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() );
      }
      if ( g.wkbType() == QgsWkbTypes::MultiPoint || g.wkbType() == QgsWkbTypes::MultiPoint25D )
      {
        fid = match.featureId();
        partNum = snapVertex;
        return QgsGeometry::fromPointXY( match.point() );
      }
      if ( g.wkbType() == QgsWkbTypes::MultiLineString || g.wkbType() == QgsWkbTypes::MultiLineString25D )
      {
        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:
    {
      QgsPointXY 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 );
      QgsGeometry g = f.geometry();
      if ( g.isNull() )
        return geomPart;
      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::canvasReleaseEvent( QgsMapMouseEvent* e )
{
  if ( !mCanvas )
  {
    return;
  }

  QgsVectorLayer* layer = currentVectorLayer();
  if ( !layer )
  {
    deleteRubberBandAndGeometry();
    notifyNotVectorLayer();
    return;
  }

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

  if ( !mOriginalGeometry )
  {
    deleteRubberBandAndGeometry();
    mGeometryModified = false;
    mForceCopy = false;

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

    QgsSnappingUtils* snapping = mCanvas->snappingUtils();

    // store previous settings
    int oldType;
    double oldSearchRadius;
    QgsTolerance::UnitType oldSearchRadiusUnit;
    QgsSnappingUtils::SnapToMapMode oldMode = snapping->snapToMapMode();
    snapping->defaultSettings( oldType, oldSearchRadius, oldSearchRadiusUnit );

    // setup new settings (temporary)
    QSettings settings;
    snapping->setSnapToMapMode( QgsSnappingUtils::SnapAllLayers );
    snapping->setDefaultSettings( QgsPointLocator::Edge,
                                  settings.value( "/qgis/digitizing/search_radius_vertex_edit", 10 ).toDouble(),
                                  ( QgsTolerance::UnitType ) settings.value( "/qgis/digitizing/search_radius_vertex_edit_unit", QgsTolerance::Pixels ).toInt() );

    QgsPointLocator::Match match = snapping->snapToMap( e->pos() );

    // restore old settings
    snapping->setSnapToMapMode( oldMode );
    snapping->setDefaultSettings( oldType, oldSearchRadius, oldSearchRadiusUnit );

    if ( match.hasEdge() && match.layer() )
    {
      mSourceLayerId = match.layer()->id();
      QgsFeature fet;
      if ( match.layer()->getFeatures( QgsFeatureRequest( match.featureId() ) ).nextFeature( fet ) )
      {
        mForceCopy = ( e->modifiers() & Qt::ControlModifier ); //no geometry modification if ctrl is pressed
        mOriginalGeometry = createOriginGeometry( match.layer(), match, fet );
        mRubberBand = createRubberBand();
        if ( mRubberBand )
        {
          mRubberBand->setToGeometry( mOriginalGeometry, layer );
        }
        mModifiedFeature = fet.id();
        createDistanceWidget();
      }
    }
    return;
  }

  applyOffset();
}