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qgstopologicalmesh.cpp
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qgstopologicalmesh.cpp
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/***************************************************************************
qgstopologicalmesh.cpp - QgsTopologicalMesh
---------------------
begin : 18.6.2021
copyright : (C) 2021 by Vincent Cloarec
email : vcloarec at gmail dot com
***************************************************************************
* *
* 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 "qgis.h"
#include "qgstopologicalmesh.h"
#include "qgsmesheditor.h"
#include "qgsmessagelog.h"
#include "qgsgeometryutils.h"
#include "qgslinestring.h"
#include <poly2tri.h>
#include <QSet>
static int vertexPositionInFace( int vertexIndex, const QgsMeshFace &face )
{
return face.indexOf( vertexIndex );
}
static int vertexPositionInFace( const QgsMesh &mesh, int vertexIndex, int faceIndex )
{
if ( faceIndex < 0 || faceIndex >= mesh.faceCount() )
return -1;
return vertexPositionInFace( vertexIndex, mesh.face( faceIndex ) );
}
static double crossProduct( int centralVertex, int vertex1, int vertex2, const QgsMesh &mesh )
{
QgsMeshVertex vc = mesh.vertices.at( centralVertex );
QgsMeshVertex v1 = mesh.vertices.at( vertex1 );
QgsMeshVertex v2 = mesh.vertices.at( vertex2 );
double ux1 = v1.x() - vc.x();
double uy1 = v1.y() - vc.y();
double vx1 = v2.x() - vc.x();
double vy1 = v2.y() - vc.y();
return ux1 * vy1 - uy1 * vx1;
}
QgsMeshVertexCirculator::QgsMeshVertexCirculator( const QgsTopologicalMesh &topologicalMesh, int vertexIndex )
: mFaces( topologicalMesh.mMesh->faces )
, mFacesNeighborhood( topologicalMesh.mFacesNeighborhood )
, mVertexIndex( vertexIndex )
{
if ( vertexIndex >= 0 && vertexIndex < topologicalMesh.mMesh->vertexCount() )
{
mCurrentFace = topologicalMesh.mVertexToFace[vertexIndex];
mIsValid = vertexPositionInFace( *topologicalMesh.mesh(), vertexIndex, mCurrentFace ) != -1;
}
else
{
mIsValid = false;
}
if ( mIsValid )
mLastValidFace = mCurrentFace;
}
QgsMeshVertexCirculator::QgsMeshVertexCirculator( const QgsTopologicalMesh::TopologicalFaces &topologicalFaces, int faceIndex, int vertexIndex )
: mFaces( topologicalFaces.mFaces )
, mFacesNeighborhood( topologicalFaces.mFacesNeighborhood )
, mVertexIndex( vertexIndex )
{
const QgsMeshFace &face = topologicalFaces.mFaces.at( faceIndex );
mIsValid = vertexPositionInFace( vertexIndex, face ) != -1;
mCurrentFace = faceIndex;
mLastValidFace = mCurrentFace;
}
QgsMeshVertexCirculator::QgsMeshVertexCirculator( const QgsTopologicalMesh::TopologicalFaces &topologicalFaces, int vertexIndex )
: mFaces( topologicalFaces.mFaces )
, mFacesNeighborhood( topologicalFaces.mFacesNeighborhood )
, mVertexIndex( vertexIndex )
{
if ( topologicalFaces.mVerticesToFace.contains( vertexIndex ) )
mCurrentFace = topologicalFaces.mVerticesToFace.values( vertexIndex ).first();
mLastValidFace = mCurrentFace;
mIsValid = mCurrentFace != -1;
}
int QgsMeshVertexCirculator::turnCounterClockwise() const
{
if ( mCurrentFace == -1 )
mCurrentFace = mLastValidFace;
else
{
int currentPos = positionInCurrentFace();
if ( currentPos == -1 )
return -1;
const QgsMeshFace ¤tFace = mFaces.at( mCurrentFace );
int faceSize = currentFace.size();
mLastValidFace = mCurrentFace;
mCurrentFace = mFacesNeighborhood.at( mCurrentFace ).at( ( currentPos + faceSize - 1 ) % currentFace.count() );
}
return mCurrentFace;
}
int QgsMeshVertexCirculator::turnClockwise() const
{
if ( mCurrentFace == -1 )
mCurrentFace = mLastValidFace;
else
{
int currentPos = positionInCurrentFace();
if ( currentPos == -1 )
return -1;
const QgsMeshFace ¤tFace = mFaces.at( mCurrentFace );
int faceSize = currentFace.size();
mLastValidFace = mCurrentFace;
mCurrentFace = mFacesNeighborhood.at( mCurrentFace ).at( ( currentPos ) % faceSize );
}
return mCurrentFace;
}
int QgsMeshVertexCirculator::currentFaceIndex() const
{
return mCurrentFace;
}
QgsMeshFace QgsMeshVertexCirculator::currentFace() const
{
if ( mCurrentFace != -1 )
return mFaces.at( mCurrentFace );
else
return QgsMeshFace();
}
bool QgsMeshVertexCirculator::goBoundaryClockwise() const
{
if ( !isValid() )
return false;
if ( mCurrentFace == -1 )
mCurrentFace = mLastValidFace;
int firstFace = mCurrentFace;
while ( turnClockwise() != -1 && currentFaceIndex() != firstFace ) {}
if ( mCurrentFace == firstFace )
return false; // a complete turn, so the vertex is not a boundary vertex, something went wrong
return ( turnCounterClockwise() != -1 );
}
bool QgsMeshVertexCirculator::goBoundaryCounterClockwise() const
{
if ( !isValid() )
return false;
if ( mCurrentFace == -1 )
mCurrentFace = mLastValidFace;
int firstFace = mCurrentFace;
while ( turnCounterClockwise() != -1 && currentFaceIndex() != firstFace ) {}
if ( mCurrentFace == firstFace )
return false; // a complete turn, so the vertex is not a boundary vertex, something went wrong
return ( turnClockwise() != -1 );
}
int QgsMeshVertexCirculator::oppositeVertexClockwise() const
{
if ( mCurrentFace == -1 )
return -1;
const QgsMeshFace &face = currentFace();
if ( face.isEmpty() )
return -1;
int vertexPosition = vertexPositionInFace( mVertexIndex, currentFace() );
if ( vertexPosition == -1 )
return -1;
return face.at( ( vertexPosition + 1 ) % face.count() );
}
int QgsMeshVertexCirculator::oppositeVertexCounterClockwise() const
{
if ( mCurrentFace == -1 )
return -1;
const QgsMeshFace &face = currentFace();
if ( face.isEmpty() )
return -1;
int vertexPosition = vertexPositionInFace( mVertexIndex, currentFace() );
if ( vertexPosition == -1 )
return -1;
return face.at( ( vertexPosition - 1 + face.count() ) % face.count() );
}
bool QgsMeshVertexCirculator::isValid() const
{
return mIsValid;
}
QList<int> QgsMeshVertexCirculator::facesAround() const
{
QList<int> ret;
if ( !isValid() )
return ret;
if ( mCurrentFace != -1 )
ret.append( mCurrentFace );
while ( turnCounterClockwise() != ret.first() && currentFaceIndex() != -1 )
ret.append( currentFaceIndex() );
if ( currentFaceIndex() == -1 ) //we encounter a boundary, restart with other direction
{
ret.clear();
if ( turnClockwise() == -1 )
return ret;
ret.append( currentFaceIndex() );
while ( turnClockwise() != -1 )
{
ret.append( currentFaceIndex() );
}
}
return ret;
}
int QgsMeshVertexCirculator::positionInCurrentFace() const
{
if ( mCurrentFace < 0 || mCurrentFace > mFaces.count() )
return -1;
return vertexPositionInFace( mVertexIndex, mFaces.at( mCurrentFace ) );
}
QgsTopologicalMesh::Changes QgsTopologicalMesh::addFaces( const QgsTopologicalMesh::TopologicalFaces &topologicalFaces )
{
Changes changes;
changes.mFacesToAdd = topologicalFaces.mFaces;
changes.mAddedFacesFirstIndex = mMesh->faceCount();
changes.mFacesNeighborhoodToAdd.resize( changes.mFacesToAdd.count() );
for ( int i = 0; i < changes.mFacesToAdd.count(); ++i )
changes.mFacesNeighborhoodToAdd[i] = QVector<int>( changes.mFacesToAdd.at( i ).count(), -1 );
for ( int boundary : topologicalFaces.mBoundaries )
{
//if the boundary is a free vertex in the destination mesh, no need to check
if ( mVertexToFace.at( boundary ) == -1 )
continue;
const QList<int> &linkedFaces = topologicalFaces.mVerticesToFace.values( boundary );
for ( int linkedFace : linkedFaces )
{
QgsMeshVertexCirculator newFacesCirculator( topologicalFaces, linkedFace, boundary );
//search for face boundary on clockwise side of new faces
newFacesCirculator.goBoundaryClockwise();
int oppositeVertexForNewFace = newFacesCirculator.oppositeVertexClockwise();
if ( mVertexToFace.at( oppositeVertexForNewFace ) == -1 )
continue;
QgsMeshVertexCirculator meshCirculator = vertexCirculator( boundary );
meshCirculator.goBoundaryCounterClockwise();
int oppositeVertexForMeshFace = meshCirculator.oppositeVertexCounterClockwise();
const QgsMeshFace &newFaceBoundary = newFacesCirculator.currentFace();
int boundaryPositionInNewFace = vertexPositionInFace( boundary, newFaceBoundary );
if ( oppositeVertexForMeshFace != oppositeVertexForNewFace )
{
changes.mFacesNeighborhoodToAdd[newFacesCirculator.currentFaceIndex()][boundaryPositionInNewFace] = -1 ;
}
else
{
const QgsMeshFace &meshFaceBoundary = meshCirculator.currentFace();
int boundaryPositionInMeshFace = vertexPositionInFace( meshCirculator.oppositeVertexCounterClockwise(), meshFaceBoundary );
changes.mNeighborhoodChanges.append( std::array<int, 4>(
{
meshCirculator.currentFaceIndex(),
boundaryPositionInMeshFace,
-1,
changes.addedFaceIndexInMesh( newFacesCirculator.currentFaceIndex() )
} ) );
changes.mFacesNeighborhoodToAdd[newFacesCirculator.currentFaceIndex()][boundaryPositionInNewFace] = meshCirculator.currentFaceIndex();
}
}
}
for ( int f = 0; f < changes.mFacesToAdd.count(); ++f )
for ( int n = 0; n < changes.mFacesToAdd.at( f ).count(); ++n )
if ( changes.mFacesNeighborhoodToAdd.at( f ).at( n ) == -1 )
changes.mFacesNeighborhoodToAdd[f][n] = changes.addedFaceIndexInMesh( topologicalFaces.mFacesNeighborhood.at( f ).at( n ) );
const QList<int> &verticesToFaceToChange = topologicalFaces.mVerticesToFace.keys();
for ( const int vtc : verticesToFaceToChange )
if ( mVertexToFace.at( vtc ) == -1 )
changes.mVerticesToFaceChanges.append( {vtc,
mVertexToFace.at( vtc ),
changes.addedFaceIndexInMesh( topologicalFaces.mVerticesToFace.values( vtc ).first() ) } );
applyChanges( changes );
return changes;
}
void QgsTopologicalMesh::applyChanges( const QgsTopologicalMesh::Changes &changes )
{
int initialVerticesCount = mMesh->vertices.count();
if ( !changes.mVerticesToAdd.empty() )
{
int newSize = mMesh->vertices.count() + changes.mVerticesToAdd.count();
mMesh->vertices.resize( newSize );
mVertexToFace.resize( newSize );
}
if ( !changes.mFacesToAdd.empty() > 0 )
{
int newSize = mMesh->faceCount() + changes.mFacesToAdd.count();
mMesh->faces.resize( newSize );
mFacesNeighborhood.resize( newSize );
}
for ( int i = 0; i < changes.mFacesToRemove.count(); ++i )
{
mMesh->faces[changes.removedFaceIndexInmesh( i )] = QgsMeshFace();
mFacesNeighborhood[changes.removedFaceIndexInmesh( i )] = FaceNeighbors();//changes.facesNeighborhoodToRemove[i];
}
for ( int i = 0; i < changes.mVerticesToRemoveIndexes.count(); ++i )
{
int vertexIndex = changes.mVerticesToRemoveIndexes.at( i );
if ( mVertexToFace.at( vertexIndex ) == -1 )
dereferenceAsFreeVertex( vertexIndex );
mMesh->vertices[vertexIndex] = QgsMeshVertex();
mVertexToFace[vertexIndex] = -1;
}
for ( int i = 0; i < changes.mVerticesToAdd.count(); ++i )
{
mMesh->vertices[initialVerticesCount + i] = changes.mVerticesToAdd.at( i );
mVertexToFace[initialVerticesCount + i] = changes.mVertexToFaceToAdd.at( i );
if ( changes.mVertexToFaceToAdd.at( i ) == -1 )
referenceAsFreeVertex( initialVerticesCount + i );
}
for ( int i = 0; i < changes.mFacesToAdd.count(); ++i )
{
mMesh->faces[changes.addedFaceIndexInMesh( i )] = changes.mFacesToAdd.at( i );
mFacesNeighborhood[changes.addedFaceIndexInMesh( i )] = changes.mFacesNeighborhoodToAdd.at( i );
}
for ( const std::array<int, 4> neigborChange : std::as_const( changes.mNeighborhoodChanges ) )
{
const int faceIndex = neigborChange.at( 0 );
const int positionInFace = neigborChange.at( 1 );
const int valueToApply = neigborChange.at( 3 );
mFacesNeighborhood[faceIndex][positionInFace] = valueToApply;
}
for ( const std::array<int, 3> vertexToFaceChange : std::as_const( changes.mVerticesToFaceChanges ) )
{
int vertexIndex = vertexToFaceChange.at( 0 );
mVertexToFace[vertexToFaceChange.at( 0 )] = vertexToFaceChange.at( 2 );
if ( vertexToFaceChange.at( 2 ) == -1 &&
vertexToFaceChange.at( 1 ) != -1 &&
!mMesh->vertices.at( vertexIndex ).isEmpty() )
referenceAsFreeVertex( vertexIndex );
if ( vertexToFaceChange.at( 1 ) == -1 && vertexToFaceChange.at( 2 ) != -1 )
dereferenceAsFreeVertex( vertexIndex );
}
for ( int i = 0; i < changes.mChangeCoordinateVerticesIndexes.count(); ++i )
{
int vertexIndex = changes.mChangeCoordinateVerticesIndexes.at( i );
if ( !changes.mNewZValues.isEmpty() )
mMesh->vertices[vertexIndex].setZ( changes.mNewZValues.at( i ) );
if ( !changes.mNewXYValues.isEmpty() )
{
const QgsPointXY &pt = changes.mNewXYValues.at( i );
mMesh->vertices[vertexIndex].setX( pt.x() );
mMesh->vertices[vertexIndex].setY( pt.y() );
}
}
}
void QgsTopologicalMesh::reverseChanges( const QgsTopologicalMesh::Changes &changes )
{
for ( const std::array<int, 4> neigborChange : std::as_const( changes.mNeighborhoodChanges ) )
{
const int faceIndex = neigborChange.at( 0 );
const int positionInFace = neigborChange.at( 1 );
const int valueToApply = neigborChange.at( 2 );
mFacesNeighborhood[faceIndex][positionInFace] = valueToApply;
}
for ( int i = 0; i < changes.mFacesToRemove.count(); ++i )
{
mMesh->faces[changes.removedFaceIndexInmesh( i )] = changes.mFacesToRemove.at( i );
mFacesNeighborhood[changes.removedFaceIndexInmesh( i )] = changes.mFacesNeighborhoodToRemove.at( i );
}
for ( int i = 0; i < changes.mVerticesToRemoveIndexes.count(); ++i )
{
int vertexIndex = changes.mVerticesToRemoveIndexes.at( i );
mMesh->vertices[vertexIndex] = changes.mRemovedVertices.at( i );
mVertexToFace[vertexIndex] = changes.mVerticesToFaceRemoved.at( i );
if ( mVertexToFace.at( vertexIndex ) == -1 )
referenceAsFreeVertex( vertexIndex );
}
int verticesToFaceChangesCount = changes.mVerticesToFaceChanges.count();
for ( int i = 0; i < verticesToFaceChangesCount; ++i )
{
const std::array<int, 3> vertexToFaceChange = changes.mVerticesToFaceChanges.at( verticesToFaceChangesCount - i - 1 );
int vertexIndex = vertexToFaceChange.at( 0 );
mVertexToFace[vertexIndex] = vertexToFaceChange.at( 1 );
if ( vertexToFaceChange.at( 2 ) == -1 && vertexToFaceChange.at( 1 ) != -1 )
dereferenceAsFreeVertex( vertexIndex );
if ( vertexToFaceChange.at( 1 ) == -1 &&
vertexToFaceChange.at( 2 ) != -1 &&
!mMesh->vertex( vertexIndex ).isEmpty() )
referenceAsFreeVertex( vertexIndex );
}
if ( !changes.mFacesToAdd.empty() > 0 )
{
int newSize = mMesh->faceCount() - changes.mFacesToAdd.count();
mMesh->faces.resize( newSize );
mFacesNeighborhood.resize( newSize );
}
if ( !changes.mVerticesToAdd.isEmpty() )
{
int newSize = mMesh->vertexCount() - changes.mVerticesToAdd.count();
for ( int i = newSize; i < mMesh->vertexCount(); ++i )
if ( mVertexToFace.at( i ) == -1 )
dereferenceAsFreeVertex( i );
mMesh->vertices.resize( newSize );
mVertexToFace.resize( newSize );
}
for ( int i = 0; i < changes.mChangeCoordinateVerticesIndexes.count(); ++i )
{
int vertexIndex = changes.mChangeCoordinateVerticesIndexes.at( i );
if ( !changes.mOldZValues.isEmpty() )
mMesh->vertices[vertexIndex].setZ( changes.mOldZValues.at( i ) );
if ( !changes.mOldXYValues.isEmpty() )
{
const QgsPointXY &pt = changes.mOldXYValues.at( i );
mMesh->vertices[vertexIndex].setX( pt.x() );
mMesh->vertices[vertexIndex].setY( pt.y() );
}
}
}
QgsMeshVertexCirculator QgsTopologicalMesh::vertexCirculator( int vertexIndex ) const
{
return QgsMeshVertexCirculator( *this, vertexIndex );
}
QSet<int> QgsTopologicalMesh::concernedFacesBy( const QList<int> faceIndexes ) const
{
QSet<int> faces;
for ( const int faceIndex : faceIndexes )
{
const QgsMeshFace &face = mMesh->face( faceIndex );
for ( int i = 0; i < face.count(); ++i )
faces.unite( qgis::listToSet( facesAroundVertex( face.at( i ) ) ) );
}
return faces;
}
void QgsTopologicalMesh::dereferenceAsFreeVertex( int vertexIndex )
{
mFreeVertices.remove( vertexIndex );
}
void QgsTopologicalMesh::referenceAsFreeVertex( int vertexIndex )
{
// QSet used to retrieve free vertex without going through all the vertices container.
// But maybe later we could use more sophisticated reference (spatial index?), to retrieve free vertex in an extent
mFreeVertices.insert( vertexIndex );
}
QgsMeshEditingError QgsTopologicalMesh::checkConsistency() const
{
for ( int faceIndex = 0 ; faceIndex < mMesh->faces.count( ); ++faceIndex )
{
const QgsMeshFace &face = mMesh->faces.at( faceIndex );
const FaceNeighbors &neighborhood = mFacesNeighborhood.at( faceIndex );
if ( face.count() != neighborhood.count() )
return QgsMeshEditingError( Qgis::MeshEditingErrorType::InvalidFace, faceIndex );
for ( int i = 0; i < face.count(); ++i )
{
int vertexIndex = face.at( i );
// check if each vertices is linked to a face (not free vertex)
if ( mVertexToFace.at( vertexIndex ) == -1 )
return QgsMeshEditingError( Qgis::MeshEditingErrorType::InvalidVertex, vertexIndex );
int neighborIndex = neighborhood.at( i );
if ( neighborIndex != -1 )
{
const QgsMeshFace &neighborFace = mMesh->faces.at( neighborIndex );
int neighborSize = neighborFace.size();
const FaceNeighbors &neighborhoodOfNeighbor = mFacesNeighborhood.at( neighborIndex );
int posInNeighbor = vertexPositionInFace( *mMesh, vertexIndex, neighborIndex );
if ( neighborhoodOfNeighbor.isEmpty() || neighborhoodOfNeighbor.at( ( posInNeighbor + neighborSize - 1 ) % neighborSize ) != faceIndex )
return QgsMeshEditingError( Qgis::MeshEditingErrorType::InvalidFace, faceIndex );
}
}
}
return QgsMeshEditingError();
}
QgsMesh *QgsTopologicalMesh::mesh() const
{
return mMesh;
}
int QgsTopologicalMesh::firstFaceLinked( int vertexIndex ) const
{
if ( vertexIndex < 0 || vertexIndex >= mMesh->vertexCount() )
return -1;
return mVertexToFace.at( vertexIndex );
}
bool QgsTopologicalMesh::isVertexOnBoundary( int vertexIndex ) const
{
QgsMeshVertexCirculator circulator = vertexCirculator( vertexIndex );
if ( circulator.isValid() )
return circulator.goBoundaryClockwise();
return false;
}
bool QgsTopologicalMesh::isVertexFree( int vertexIndex ) const
{
if ( vertexIndex < 0 || vertexIndex >= mMesh->vertexCount() )
return false;
if ( mMesh->vertices.at( vertexIndex ).isEmpty() )
return false;
return mVertexToFace.at( vertexIndex ) == -1;
}
QList<int> QgsTopologicalMesh::freeVerticesIndexes() const
{
#if QT_VERSION < QT_VERSION_CHECK(5, 14, 0)
return mFreeVertices.values();
#else
return QList<int>( mFreeVertices.begin(), mFreeVertices.end() );
#endif
}
QgsMeshEditingError QgsTopologicalMesh::counterClockWiseFaces( QgsMeshFace &face, QgsMesh *mesh )
{
// First check if the face is convex and put it counter clockwise
// If the index are not well ordered (edges intersect), invalid face --> return false
int faceSize = face.count();
if ( faceSize < 3 )
return QgsMeshEditingError( Qgis::MeshEditingErrorType::FlatFace, -1 );
int direction = 0;
for ( int i = 0; i < faceSize; ++i )
{
int iv0 = face[i];
int iv1 = face[( i + 1 ) % faceSize];
int iv2 = face[( i + 2 ) % faceSize];
if ( iv0 < 0 || iv0 >= mesh->vertexCount() )
return QgsMeshEditingError( Qgis::MeshEditingErrorType::InvalidVertex, iv0 );
if ( iv1 < 0 || iv1 >= mesh->vertexCount() )
return QgsMeshEditingError( Qgis::MeshEditingErrorType::InvalidVertex, iv1 );
if ( iv2 < 0 || iv2 >= mesh->vertexCount() )
return QgsMeshEditingError( Qgis::MeshEditingErrorType::InvalidVertex, iv2 );
const QgsMeshVertex &v0 = mesh->vertices.at( iv0 ) ;
const QgsMeshVertex &v1 = mesh->vertices.at( iv1 ) ;
const QgsMeshVertex &v2 = mesh->vertices.at( iv2 ) ;
if ( v0.isEmpty() )
return QgsMeshEditingError( Qgis::MeshEditingErrorType::InvalidVertex, iv0 );
if ( v1.isEmpty() )
return QgsMeshEditingError( Qgis::MeshEditingErrorType::InvalidVertex, iv1 );
if ( v2.isEmpty() )
return QgsMeshEditingError( Qgis::MeshEditingErrorType::InvalidVertex, iv2 );
double crossProd = crossProduct( iv1, iv0, iv2, *mesh ); //if cross product>0, we have two edges clockwise
if ( direction != 0 && crossProd * direction < 0 ) // We have a convex face or a (partially) flat face
return QgsMeshEditingError( Qgis::MeshEditingErrorType::InvalidFace, -1 );
else if ( crossProd == 0 )
return QgsMeshEditingError( Qgis::MeshEditingErrorType::FlatFace, -1 );
else if ( direction == 0 && crossProd != 0 )
direction = crossProd / std::fabs( crossProd );
}
if ( direction > 0 )// clockwise --> reverse the order of the index;
{
for ( int i = 0; i < faceSize / 2; ++i )
{
int temp = face[i];
face[i] = face.at( faceSize - i - 1 );
face[faceSize - i - 1] = temp;
}
}
return QgsMeshEditingError( Qgis::MeshEditingErrorType::NoError, -1 );
}
void QgsTopologicalMesh::reindex()
{
QVector<int> oldToNewIndex( mMesh->vertices.count(), -1 );
int verticesTotalCount = mMesh->vertexCount();
int oldIndex = 0;
int newIndex = 0;
while ( oldIndex < verticesTotalCount )
{
if ( mMesh->vertex( oldIndex ).isEmpty() )
{
oldIndex++;
}
else
{
oldToNewIndex[oldIndex] = newIndex;
if ( oldIndex != newIndex )
mMesh->vertices[newIndex] = mMesh->vertices[oldIndex];
oldToNewIndex[oldIndex] = newIndex;
oldIndex++;
newIndex++;
}
}
mMesh->vertices.resize( newIndex );
oldIndex = 0;
newIndex = 0;
int facesTotalCount = mMesh->faceCount();
while ( oldIndex < facesTotalCount )
{
if ( mMesh->face( oldIndex ).isEmpty() )
oldIndex++;
else
{
if ( oldIndex != newIndex )
mMesh->faces[newIndex] = mMesh->faces[oldIndex];
QgsMeshFace &face = mMesh->faces[newIndex];
for ( int i = 0; i < face.count(); ++i )
face[i] = oldToNewIndex[face.at( i )];
newIndex++;
oldIndex++;
}
}
mMesh->faces.resize( newIndex );
mVertexToFace.clear();
mFacesNeighborhood.clear();
}
QVector<QgsMeshFace> QgsTopologicalMesh::Changes::addedFaces() const
{
return mFacesToAdd;
}
QVector<QgsMeshFace> QgsTopologicalMesh::Changes::removedFaces() const
{
return mFacesToRemove;
}
QList<int> QgsTopologicalMesh::Changes::removedFaceIndexes() const
{
return mFaceIndexesToRemove;
}
QVector<QgsMeshVertex> QgsTopologicalMesh::Changes::addedVertices() const
{
return mVerticesToAdd;
}
QList<int> QgsTopologicalMesh::Changes::changedCoordinatesVerticesIndexes() const
{
return mChangeCoordinateVerticesIndexes;
}
QList<double> QgsTopologicalMesh::Changes::newVerticesZValues() const
{
return mNewZValues;
}
QList<QgsPointXY> QgsTopologicalMesh::Changes::newVerticesXYValues() const
{
return mNewXYValues;
}
QList<QgsPointXY> QgsTopologicalMesh::Changes::oldVerticesXYValues() const
{
return mOldXYValues;
}
QList<int> QgsTopologicalMesh::Changes::nativeFacesIndexesGeometryChanged() const
{
return mNativeFacesIndexesGeometryChanged;
}
int QgsTopologicalMesh::Changes::addedFaceIndexInMesh( int internalIndex ) const
{
if ( internalIndex == -1 )
return -1;
return internalIndex + mAddedFacesFirstIndex;
}
int QgsTopologicalMesh::Changes::removedFaceIndexInmesh( int internalIndex ) const
{
if ( internalIndex == -1 )
return -1;
return mFaceIndexesToRemove.at( internalIndex );
}
void QgsTopologicalMesh::Changes::clearChanges()
{
mAddedFacesFirstIndex = 0;
mFaceIndexesToRemove.clear();
mFacesToAdd.clear();
mFacesNeighborhoodToAdd.clear();
mFacesToRemove.clear();
mFacesNeighborhoodToRemove.clear();
mNeighborhoodChanges.clear();
mVerticesToAdd.clear();
mVertexToFaceToAdd.clear();
mVerticesToRemoveIndexes.clear();
mRemovedVertices.clear();
mVerticesToFaceRemoved.clear();
mVerticesToFaceChanges.clear();
mChangeCoordinateVerticesIndexes.clear();
mNewZValues.clear();
mOldZValues.clear();
mNewXYValues.clear();
mOldXYValues.clear();
mNativeFacesIndexesGeometryChanged.clear();
}
QgsTopologicalMesh::Changes QgsTopologicalMesh::addFreeVertex( const QgsMeshVertex &vertex )
{
Changes changes;
changes.mVerticesToAdd.append( vertex );
changes.mVertexToFaceToAdd.append( -1 );
mMesh->vertices.append( vertex );
mVertexToFace.append( -1 );
referenceAsFreeVertex( mMesh->vertices.count() - 1 );
return changes;
}
QgsTopologicalMesh::Changes QgsTopologicalMesh::removeVertexFillHole( int vertexIndex )
{
if ( mVertexToFace.at( vertexIndex ) == -1 ) //it is a free vertex
{
Changes changes;
changes.mRemovedVertices.append( mMesh->vertices.at( vertexIndex ) );
changes.mVerticesToRemoveIndexes.append( vertexIndex );
changes.mVerticesToFaceRemoved.append( -1 );
dereferenceAsFreeVertex( vertexIndex );
mMesh->vertices[vertexIndex] = QgsMeshVertex();
return changes;
}
//search concerned faces
QgsMeshVertexCirculator circulator = vertexCirculator( vertexIndex );
circulator.goBoundaryClockwise();
QList<int> boundariesVertexIndex;
QList<int> associateFaceToBoundaries;
QList<int> removedFacesIndexes;
do
{
removedFacesIndexes.append( circulator.currentFaceIndex() );
boundariesVertexIndex.append( circulator.oppositeVertexClockwise() );
const QgsMeshFace ¤tFace = circulator.currentFace();
associateFaceToBoundaries.append( mFacesNeighborhood.at( circulator.currentFaceIndex() ).at(
vertexPositionInFace( boundariesVertexIndex.last(), currentFace ) ) );
if ( currentFace.count() > 3 ) // quad or more, need other vertices
{
int posInface = vertexPositionInFace( vertexIndex, currentFace );
for ( int i = 2; i < currentFace.count() - 1; ++i )
{
boundariesVertexIndex.append( currentFace.at( ( posInface + i ) % currentFace.count() ) );
associateFaceToBoundaries.append( mFacesNeighborhood.at( circulator.currentFaceIndex() ).at(
vertexPositionInFace( boundariesVertexIndex.last(), currentFace ) ) );
}
}
}
while ( circulator.turnCounterClockwise() != -1 && circulator.currentFaceIndex() != removedFacesIndexes.first() );
bool boundaryFill = false;
if ( circulator.currentFaceIndex() == -1 ) //we are on boundary of the mesh
{
boundaryFill = true;
//we need to add last vertex/boundary faces that was not added because we are on mesh boundary
circulator.goBoundaryCounterClockwise();
boundariesVertexIndex.append( circulator.oppositeVertexCounterClockwise() );
associateFaceToBoundaries.append( -1 );
}
int currentVertexToFace = mVertexToFace.at( vertexIndex );
// here, we use the method removeFaces that effectivly removes and then constructs changes
Changes changes = removeFaces( removedFacesIndexes );
changes.mRemovedVertices.append( mMesh->vertices.at( vertexIndex ) );
changes.mVerticesToRemoveIndexes.append( vertexIndex );
changes.mVerticesToFaceRemoved.append( currentVertexToFace );
// these changes contain information that will lead to reference the removed vertex as free vertex when reverse/reapply
dereferenceAsFreeVertex( vertexIndex );
mMesh->vertices[vertexIndex] = QgsMeshVertex();
mVertexToFace[vertexIndex] = -1;
QList<QList<int>> holes;
QList<QList<int>> associateMeshFacesToHoles;
if ( boundaryFill )
{
// The hole is not a closed polygon, we need to close it, but the closing segment can intersect another segment.
// In this case we consider as many polygons as necessary.
while ( boundariesVertexIndex.count() > 1 )
{
int concavePointPos = -1;
const QgsPoint &p1 = mMesh->vertices.at( boundariesVertexIndex.first() );
const QgsPoint *p2 = &mMesh->vertices.at( boundariesVertexIndex.last() );
for ( int i = 1; i < boundariesVertexIndex.count() - 1; ++i )
{
const QgsPoint *pointToTest = &mMesh->vertices.at( boundariesVertexIndex.at( i ) );
if ( QgsGeometryUtils::leftOfLine( *pointToTest, p1, *p2 ) < 0 )
{
concavePointPos = i;
p2 = pointToTest;
}
}
if ( concavePointPos == -1 ) //all boundaries are concave
{
holes.append( boundariesVertexIndex );
associateMeshFacesToHoles.append( associateFaceToBoundaries );
break;
}
else if ( concavePointPos == 1 ) //we don't have concave boundarie from the first point
{
boundariesVertexIndex.removeFirst();
associateFaceToBoundaries.removeFirst();
}
else //concave point between first and last --> split
{
QList<int> partialHoleVertexIndex = boundariesVertexIndex.mid( 0, concavePointPos + 1 );
QList<int> partialAssociateFaces = associateFaceToBoundaries.mid( 0, concavePointPos + 1 );
holes.append( partialHoleVertexIndex );
partialAssociateFaces[partialAssociateFaces.count() - 1] = -1;
associateMeshFacesToHoles.append( partialAssociateFaces );
boundariesVertexIndex = boundariesVertexIndex.mid( concavePointPos );
associateFaceToBoundaries = associateFaceToBoundaries.mid( concavePointPos );
}
}
}
else
{
holes.append( boundariesVertexIndex );
associateMeshFacesToHoles.append( associateFaceToBoundaries );
}
Q_ASSERT( holes.count() == associateMeshFacesToHoles.count() );
int oldFacesCount = mMesh->faceCount();
for ( int i = 0; i < holes.count(); ++i )
{
const QList<int> &holeVertices = holes.at( i );
const QList<int> &associateMeshFacesToHole = associateMeshFacesToHoles.at( i );
QHash<p2t::Point *, int> mapPoly2TriPointToVertex;
std::vector<p2t::Point *> holeToFill( holeVertices.count() );
for ( int i = 0; i < holeVertices.count(); ++i )
{
const QgsMeshVertex &vertex = mMesh->vertex( holeVertices.at( i ) );
holeToFill[i] = new p2t::Point( vertex.x(), vertex.y() );
mapPoly2TriPointToVertex.insert( holeToFill[i], holeVertices.at( i ) );
}
std::unique_ptr<p2t::CDT> cdt( new p2t::CDT( holeToFill ) );
try
{
cdt->Triangulate();
std::vector<p2t::Triangle *> triangles = cdt->GetTriangles();
QVector<QgsMeshFace> newFaces( triangles.size() );
for ( size_t i = 0; i < triangles.size(); ++i )
{
QgsMeshFace &face = newFaces[i];
face.resize( 3 );
for ( int j = 0; j < 3; j++ )
{
int vertInd = mapPoly2TriPointToVertex.value( triangles.at( i )->GetPoint( j ), -1 );
if ( vertInd == -1 )
throw std::exception();
Q_ASSERT( !mMesh->vertices.at( vertInd ).isEmpty() );
face[j] = vertInd;
}
}
QgsMeshEditingError error;
QgsTopologicalMesh::TopologicalFaces topologicalFaces = createNewTopologicalFaces( newFaces, false, error );
if ( error.errorType != Qgis::MeshEditingErrorType::NoError )
throw std::exception();
int newFaceIndexStartIndex = mMesh->faceCount();
QgsTopologicalMesh::Changes addChanges;
addChanges.mAddedFacesFirstIndex = newFaceIndexStartIndex;
addChanges.mFacesToAdd = topologicalFaces.meshFaces();
addChanges.mFacesNeighborhoodToAdd = topologicalFaces.mFacesNeighborhood;
// vertices to face changes
const QList<int> &verticesToFaceToChange = topologicalFaces.mVerticesToFace.keys();
for ( const int vtc : verticesToFaceToChange )
if ( mVertexToFace.at( vtc ) == -1 )
addChanges.mVerticesToFaceChanges.append( {vtc,
mVertexToFace.at( vtc ),
addChanges.addedFaceIndexInMesh( topologicalFaces.mVerticesToFace.values( vtc ).first() ) } );
// reindex neighborhood for new faces
for ( int i = 0; i < topologicalFaces.mFaces.count(); ++i )
{
FaceNeighbors &faceNeighbors = addChanges.mFacesNeighborhoodToAdd[i];
faceNeighbors = topologicalFaces.mFacesNeighborhood.at( i );
for ( int n = 0; n < faceNeighbors.count(); ++n )
{
if ( faceNeighbors.at( n ) != -1 )
faceNeighbors[n] += newFaceIndexStartIndex; //reindex internal neighborhood
}
}
// link neighborhood for boundaries of each side
for ( int i = 0 ; i < holeVertices.count(); ++i )
{
int vertexHoleIndex = holeVertices.at( i );
int meshFaceBoundaryIndex = associateMeshFacesToHole.at( i );
QgsMeshVertexCirculator circulator = QgsMeshVertexCirculator( topologicalFaces, vertexHoleIndex );
circulator.goBoundaryClockwise();
int newFaceBoundaryLocalIndex = circulator.currentFaceIndex();
int newFaceBoundaryIndexInMesh = circulator.currentFaceIndex() + newFaceIndexStartIndex;
const QgsMeshFace &newFace = circulator.currentFace();
int positionInNewFaces = vertexPositionInFace( vertexHoleIndex, newFace );
if ( meshFaceBoundaryIndex != -1 )
{
const QgsMeshFace meshFace = mMesh->face( meshFaceBoundaryIndex );
int positionInMeshFaceBoundary = vertexPositionInFace( *mMesh, vertexHoleIndex, meshFaceBoundaryIndex );
positionInMeshFaceBoundary = ( positionInMeshFaceBoundary - 1 + meshFace.count() ) % meshFace.count(); //take the position just before
addChanges.mNeighborhoodChanges.append( {meshFaceBoundaryIndex, positionInMeshFaceBoundary, -1, newFaceBoundaryIndexInMesh} );
}
addChanges.mFacesNeighborhoodToAdd[newFaceBoundaryLocalIndex][positionInNewFaces] = meshFaceBoundaryIndex;
}
applyChanges( addChanges );