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Optimise and simplify tie point calculation

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This commit is contained in:
Nyall Dawson 2017-10-29 09:29:11 +10:00
parent 8a68a410bf
commit ae8dc1cfb3
2 changed files with 53 additions and 65 deletions
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68
src/analysis/network/qgsvectorlayerdirector.cpp
View File

@ -89,20 +89,20 @@ template <typename RandIter, typename Type, typename CompareOp > RandIter my_bin
struct TiePointInfo struct TiePointInfo
{ {
TiePointInfo() = default;
TiePointInfo( QgsFeatureId featureId, const QgsPointXY &start, const QgsPointXY &end )
: mNetworkFeatureId( featureId )
, mFirstPoint( start )
, mLastPoint( end )
{}
QgsPointXY mTiedPoint; QgsPointXY mTiedPoint;
double mLength; double mLength = DBL_MAX;
QgsFeatureId mNetworkFeatureId = -1;
QgsPointXY mFirstPoint; QgsPointXY mFirstPoint;
QgsPointXY mLastPoint; QgsPointXY mLastPoint;
}; };
bool TiePointInfoCompare( const TiePointInfo &a, const TiePointInfo &b )
{
if ( a.mFirstPoint == b.mFirstPoint )
return a.mLastPoint.x() == b.mLastPoint.x() ? a.mLastPoint.y() < b.mLastPoint.y() : a.mLastPoint.x() < b.mLastPoint.x();
return a.mFirstPoint.x() == b.mFirstPoint.x() ? a.mFirstPoint.y() < b.mFirstPoint.y() : a.mFirstPoint.x() < b.mFirstPoint.x();
}
QgsVectorLayerDirector::QgsVectorLayerDirector( QgsFeatureSource *source, QgsVectorLayerDirector::QgsVectorLayerDirector( QgsFeatureSource *source,
int directionFieldId, int directionFieldId,
const QString &directDirectionValue, const QString &directDirectionValue,
@ -157,11 +157,7 @@ void QgsVectorLayerDirector::makeGraph( QgsGraphBuilderInterface *builder, const
snappedPoints = QVector< QgsPointXY >( additionalPoints.size(), QgsPointXY( 0.0, 0.0 ) ); snappedPoints = QVector< QgsPointXY >( additionalPoints.size(), QgsPointXY( 0.0, 0.0 ) );
TiePointInfo tmpInfo; QVector< TiePointInfo > additionalTiePoints( additionalPoints.size() );
tmpInfo.mLength = std::numeric_limits<double>::infinity();
QVector< TiePointInfo > pointLengthMap( additionalPoints.size(), tmpInfo );
QVector< TiePointInfo >::iterator pointLengthIt;
//Graph's points; //Graph's points;
QVector< QgsPointXY > points; QVector< QgsPointXY > points;
@ -199,7 +195,7 @@ void QgsVectorLayerDirector::makeGraph( QgsGraphBuilderInterface *builder, const
int i = 0; int i = 0;
for ( i = 0; i != additionalPoints.size(); ++i ) for ( i = 0; i != additionalPoints.size(); ++i )
{ {
TiePointInfo info; TiePointInfo info( feature.id(), pt1, pt2 );
if ( pt1 == pt2 ) if ( pt1 == pt2 )
{ {
info.mLength = additionalPoints[ i ].sqrDist( pt1 ); info.mLength = additionalPoints[ i ].sqrDist( pt1 );
@ -211,12 +207,9 @@ void QgsVectorLayerDirector::makeGraph( QgsGraphBuilderInterface *builder, const
pt2.x(), pt2.y(), info.mTiedPoint ); pt2.x(), pt2.y(), info.mTiedPoint );
} }
if ( pointLengthMap[ i ].mLength > info.mLength ) if ( additionalTiePoints[ i ].mLength > info.mLength )
{ {
info.mFirstPoint = pt1; additionalTiePoints[ i ] = info;
info.mLastPoint = pt2;
pointLengthMap[ i ] = info;
snappedPoints[ i ] = info.mTiedPoint; snappedPoints[ i ] = info.mTiedPoint;
} }
} }
@ -231,10 +224,15 @@ void QgsVectorLayerDirector::makeGraph( QgsGraphBuilderInterface *builder, const
} }
} }
// end: tie points to graph QHash< QgsFeatureId, QList< int > > tiePointNetworkFeatures;
int i = 0;
for ( TiePointInfo &info : additionalTiePoints )
{
tiePointNetworkFeatures[ info.mNetworkFeatureId ] << i;
i++;
}
// add tied point to graph // add tied point to graph
int i = 0;
for ( i = 0; i < snappedPoints.size(); ++i ) for ( i = 0; i < snappedPoints.size(); ++i )
{ {
if ( snappedPoints[ i ] != QgsPointXY( 0.0, 0.0 ) ) if ( snappedPoints[ i ] != QgsPointXY( 0.0, 0.0 ) )
@ -255,8 +253,6 @@ void QgsVectorLayerDirector::makeGraph( QgsGraphBuilderInterface *builder, const
for ( i = 0; i < snappedPoints.size() ; ++i ) for ( i = 0; i < snappedPoints.size() ; ++i )
snappedPoints[ i ] = *( my_binary_search( points.begin(), points.end(), snappedPoints[ i ], pointCompare ) ); snappedPoints[ i ] = *( my_binary_search( points.begin(), points.end(), snappedPoints[ i ], pointCompare ) );
std::sort( pointLengthMap.begin(), pointLengthMap.end(), TiePointInfoCompare );
// begin graph construction // begin graph construction
fit = mSource->getFeatures( QgsFeatureRequest().setSubsetOfAttributes( requiredAttributes() ) ); fit = mSource->getFeatures( QgsFeatureRequest().setSubsetOfAttributes( requiredAttributes() ) );
while ( fit.nextFeature( feature ) ) while ( fit.nextFeature( feature ) )
@ -307,27 +303,15 @@ void QgsVectorLayerDirector::makeGraph( QgsGraphBuilderInterface *builder, const
pointsOnArc[ 0.0 ] = pt1; pointsOnArc[ 0.0 ] = pt1;
pointsOnArc[ pt1.sqrDist( pt2 )] = pt2; pointsOnArc[ pt1.sqrDist( pt2 )] = pt2;
TiePointInfo t; const QList< int > tiePointsForCurrentFeature = tiePointNetworkFeatures.value( feature.id() );
t.mFirstPoint = pt1; if ( !tiePointsForCurrentFeature.empty() )
t.mLastPoint = pt2;
t.mLength = 0.0;
pointLengthIt = my_binary_search( pointLengthMap.begin(), pointLengthMap.end(), t, TiePointInfoCompare );
if ( pointLengthIt != pointLengthMap.end() )
{ {
QVector< TiePointInfo >::iterator it; for ( int tiePointIdx : tiePointsForCurrentFeature )
for ( it = pointLengthIt; it - pointLengthMap.begin() >= 0; --it )
{ {
if ( it->mFirstPoint == pt1 && it->mLastPoint == pt2 ) const TiePointInfo &t = additionalTiePoints.at( tiePointIdx );
if ( t.mFirstPoint == pt1 && t.mLastPoint == pt2 )
{ {
pointsOnArc[ pt1.sqrDist( it->mTiedPoint )] = it->mTiedPoint; pointsOnArc[ pt1.sqrDist( t.mTiedPoint )] = t.mTiedPoint;
}
}
for ( it = pointLengthIt + 1; it != pointLengthMap.end(); ++it )
{
if ( it->mFirstPoint == pt1 && it->mLastPoint == pt2 )
{
pointsOnArc[ pt1.sqrDist( it->mTiedPoint )] = it->mTiedPoint;
} }
} }
} }

50
tests/src/analysis/testqgsnetworkanalysis.cpp
View File

@ -230,39 +230,43 @@ void TestQgsNetworkAnalysis::testBuildTolerance()
QCOMPARE( graph->edge( 5 ).fromVertex(), 3 ); QCOMPARE( graph->edge( 5 ).fromVertex(), 3 );
QCOMPARE( graph->edge( 5 ).toVertex(), 4 ); QCOMPARE( graph->edge( 5 ).toVertex(), 4 );
#if 0 // broken
// with tolerance // with tolerance
builder = qgis::make_unique< QgsGraphBuilder > ( network->sourceCrs(), true, 0.11 ); #if 0 //BROKEN, but should be sufficient
double tolerance = 0.11;
#else
double tolerance = 6;
#endif
builder = qgis::make_unique< QgsGraphBuilder > ( network->sourceCrs(), true, tolerance );
director->makeGraph( builder.get(), QVector<QgsPointXY>(), snapped ); director->makeGraph( builder.get(), QVector<QgsPointXY>(), snapped );
graph.reset( builder->graph() ); graph.reset( builder->graph() );
QCOMPARE( graph->vertexCount(), 5 ); QCOMPARE( graph->vertexCount(), 5 );
QCOMPARE( graph->edgeCount(), 6 ); QCOMPARE( graph->edgeCount(), 6 );
QCOMPARE( graph->vertex( 0 ).point(), QgsPointXY( 0, 0 ) ); QCOMPARE( graph->vertex( 0 ).point(), QgsPointXY( 0, 0 ) );
QCOMPARE( graph->vertex( 0 ).inEdges(), QList< int >() << 1 ); QCOMPARE( graph->vertex( 0 ).outgoingEdges(), QList< int >() << 1 );
QCOMPARE( graph->edge( 1 ).inVertex(), 0 ); QCOMPARE( graph->edge( 1 ).fromVertex(), 0 );
QCOMPARE( graph->edge( 1 ).outVertex(), 1 ); QCOMPARE( graph->edge( 1 ).toVertex(), 1 );
QCOMPARE( graph->vertex( 0 ).outEdges(), QList< int >() << 0 ); QCOMPARE( graph->vertex( 0 ).incomingEdges(), QList< int >() << 0 );
QCOMPARE( graph->edge( 0 ).inVertex(), 1 ); QCOMPARE( graph->edge( 0 ).fromVertex(), 1 );
QCOMPARE( graph->edge( 0 ).outVertex(), 0 ); QCOMPARE( graph->edge( 0 ).toVertex(), 0 );
QCOMPARE( graph->vertex( 1 ).point(), QgsPointXY( 10, 0 ) ); QCOMPARE( graph->vertex( 1 ).point(), QgsPointXY( 10, 0 ) );
QCOMPARE( graph->vertex( 1 ).inEdges(), QList< int >() << 0 << 3 ); QCOMPARE( graph->vertex( 1 ).outgoingEdges(), QList< int >() << 0 << 3 );
QCOMPARE( graph->vertex( 1 ).outEdges(), QList< int >() << 1 << 2 ); QCOMPARE( graph->vertex( 1 ).incomingEdges(), QList< int >() << 1 << 2 );
QCOMPARE( graph->edge( 2 ).inVertex(), 2 ); QCOMPARE( graph->edge( 2 ).fromVertex(), 2 );
QCOMPARE( graph->edge( 2 ).outVertex(), 1 ); QCOMPARE( graph->edge( 2 ).toVertex(), 1 );
QCOMPARE( graph->edge( 3 ).inVertex(), 1 ); QCOMPARE( graph->edge( 3 ).fromVertex(), 1 );
QCOMPARE( graph->edge( 3 ).outVertex(), 2 ); QCOMPARE( graph->edge( 3 ).toVertex(), 2 );
QCOMPARE( graph->vertex( 2 ).point(), QgsPointXY( 10, 10 ) ); QCOMPARE( graph->vertex( 2 ).point(), QgsPointXY( 10, 10 ) );
QCOMPARE( graph->vertex( 2 ).inEdges(), QList< int >() << 2 << 5 ); QCOMPARE( graph->vertex( 2 ).outgoingEdges(), QList< int >() << 2 << 5 );
QCOMPARE( graph->vertex( 2 ).outEdges(), QList< int >() << 3 << 4 ); QCOMPARE( graph->vertex( 2 ).incomingEdges(), QList< int >() << 3 << 4 );
QCOMPARE( graph->vertex( 3 ).point(), QgsPointXY( 10.1, 10 ) ); QCOMPARE( graph->vertex( 3 ).point(), QgsPointXY( 10.1, 10 ) );
QCOMPARE( graph->vertex( 3 ).inEdges(), QList< int >() ); QCOMPARE( graph->vertex( 3 ).outgoingEdges(), QList< int >() );
QCOMPARE( graph->vertex( 3 ).outEdges(), QList< int >() ); QCOMPARE( graph->vertex( 3 ).incomingEdges(), QList< int >() );
QCOMPARE( graph->vertex( 4 ).point(), QgsPointXY( 20, 10 ) ); QCOMPARE( graph->vertex( 4 ).point(), QgsPointXY( 20, 10 ) );
QCOMPARE( graph->edge( 4 ).inVertex(), 4 ); QCOMPARE( graph->edge( 4 ).fromVertex(), 4 );
QCOMPARE( graph->edge( 4 ).outVertex(), 2 ); QCOMPARE( graph->edge( 4 ).toVertex(), 2 );
QCOMPARE( graph->edge( 5 ).inVertex(), 2 ); QCOMPARE( graph->edge( 5 ).fromVertex(), 2 );
QCOMPARE( graph->edge( 5 ).outVertex(), 4 ); QCOMPARE( graph->edge( 5 ).toVertex(), 4 );
#endif
} }