bool QgsCurvePolygon::fromWkb( QgsConstWkbPtr &wkbPtr )
{
clear();
if ( !wkbPtr )
{
return false;
}
QgsWkbTypes::Type type = wkbPtr.readHeader();
if ( QgsWkbTypes::flatType( type ) != QgsWkbTypes::CurvePolygon )
{
return false;
}
mWkbType = type;
int nRings;
wkbPtr >> nRings;
std::unique_ptr< QgsCurve > currentCurve;
for ( int i = 0; i < nRings; ++i )
{
QgsWkbTypes::Type curveType = wkbPtr.readHeader();
wkbPtr -= 1 + sizeof( int );
QgsWkbTypes::Type flatCurveType = QgsWkbTypes::flatType( curveType );
if ( flatCurveType == QgsWkbTypes::LineString )
{
currentCurve.reset( new QgsLineString() );
}
else if ( flatCurveType == QgsWkbTypes::CircularString )
{
currentCurve.reset( new QgsCircularString() );
}
else if ( flatCurveType == QgsWkbTypes::CompoundCurve )
{
currentCurve.reset( new QgsCompoundCurve() );
}
else
{
return false;
}
currentCurve->fromWkb( wkbPtr ); // also updates wkbPtr
if ( i == 0 )
{
mExteriorRing = std::move( currentCurve );
}
else
{
mInteriorRings.append( currentCurve.release() );
}
}
return true;
}
QgsConstWkbPtr QgsClipper::clippedLineWKB( QgsConstWkbPtr wkbPtr, const QgsRectangle& clipExtent, QPolygonF& line )
{
QgsWKBTypes::Type wkbType = wkbPtr.readHeader();
int nPoints;
wkbPtr >> nPoints;
int skipZM = ( QgsWKBTypes::coordDimensions( wkbType ) - 2 ) * sizeof( double );
if ( static_cast<int>( nPoints * ( 2 * sizeof( double ) + skipZM ) ) > wkbPtr.remaining() )
{
QgsDebugMsg( QString( "%1 points exceed wkb length (%2>%3)" ).arg( nPoints ).arg( nPoints * ( 2 * sizeof( double ) + skipZM ) ).arg( wkbPtr.remaining() ) );
return QgsConstWkbPtr( nullptr, 0 );
}
double p0x, p0y, p1x = 0.0, p1y = 0.0; //original coordinates
double p1x_c, p1y_c; //clipped end coordinates
double lastClipX = 0.0, lastClipY = 0.0; //last successfully clipped coords
line.clear();
line.reserve( nPoints + 1 );
for ( int i = 0; i < nPoints; ++i )
{
if ( i == 0 )
{
wkbPtr >> p1x >> p1y;
wkbPtr += skipZM;
continue;
}
else
{
bool QgsPolygonV2::fromWkb( QgsConstWkbPtr wkbPtr )
{
clear();
if ( !wkbPtr )
{
return false;
}
QgsWKBTypes::Type type = wkbPtr.readHeader();
if ( QgsWKBTypes::flatType( type ) != QgsWKBTypes::Polygon )
{
return false;
}
mWkbType = type;
QgsWKBTypes::Type ringType;
switch ( mWkbType )
{
case QgsWKBTypes::PolygonZ:
ringType = QgsWKBTypes::LineStringZ;
break;
case QgsWKBTypes::PolygonM:
ringType = QgsWKBTypes::LineStringM;
break;
case QgsWKBTypes::PolygonZM:
ringType = QgsWKBTypes::LineStringZM;
break;
case QgsWKBTypes::Polygon25D:
ringType = QgsWKBTypes::LineString25D;
break;
default:
ringType = QgsWKBTypes::LineString;
break;
}
int nRings;
wkbPtr >> nRings;
for ( int i = 0; i < nRings; ++i )
{
QgsLineStringV2* line = new QgsLineStringV2();
line->fromWkbPoints( ringType, wkbPtr );
/*if ( !line->isRing() )
{
delete line; continue;
}*/
if ( !mExteriorRing )
{
mExteriorRing = line;
}
else
{
mInteriorRings.append( line );
}
}
return true;
}
bool QgsCompoundCurve::fromWkb( QgsConstWkbPtr &wkbPtr )
{
clear();
if ( !wkbPtr )
{
return false;
}
QgsWkbTypes::Type type = wkbPtr.readHeader();
if ( QgsWkbTypes::flatType( type ) != QgsWkbTypes::CompoundCurve )
{
return false;
}
mWkbType = type;
int nCurves;
wkbPtr >> nCurves;
QgsCurve *currentCurve = nullptr;
for ( int i = 0; i < nCurves; ++i )
{
QgsWkbTypes::Type curveType = wkbPtr.readHeader();
wkbPtr -= 1 + sizeof( int );
if ( QgsWkbTypes::flatType( curveType ) == QgsWkbTypes::LineString )
{
currentCurve = new QgsLineString();
}
else if ( QgsWkbTypes::flatType( curveType ) == QgsWkbTypes::CircularString )
{
currentCurve = new QgsCircularString();
}
else
{
return false;
}
currentCurve->fromWkb( wkbPtr ); // also updates wkbPtr
mCurves.append( currentCurve );
}
return true;
}
QgsConstWkbPtr QgsSymbolV2::_getLineString( QPolygonF& pts, QgsRenderContext& context, QgsConstWkbPtr wkbPtr, bool clipToExtent )
{
QgsWKBTypes::Type wkbType = wkbPtr.readHeader();
unsigned int nPoints;
wkbPtr >> nPoints;
const QgsCoordinateTransform* ct = context.coordinateTransform();
const QgsMapToPixel& mtp = context.mapToPixel();
//apply clipping for large lines to achieve a better rendering performance
if ( clipToExtent && nPoints > 1 )
{
const QgsRectangle& e = context.extent();
double cw = e.width() / 10;
double ch = e.height() / 10;
QgsRectangle clipRect( e.xMinimum() - cw, e.yMinimum() - ch, e.xMaximum() + cw, e.yMaximum() + ch );
wkbPtr -= 1 + 2 * sizeof( int );
wkbPtr = QgsClipper::clippedLineWKB( wkbPtr, clipRect, pts );
}
else
{
pts.resize( nPoints );
int skipZM = ( QgsWKBTypes::coordDimensions( wkbType ) - 2 ) * sizeof( double );
Q_ASSERT( skipZM >= 0 );
QPointF *ptr = pts.data();
for ( unsigned int i = 0; i < nPoints; ++i, ++ptr )
{
wkbPtr >> ptr->rx() >> ptr->ry();
wkbPtr += skipZM;
}
}
//transform the QPolygonF to screen coordinates
if ( ct )
{
ct->transformPolygon( pts );
}
QPointF *ptr = pts.data();
for ( int i = 0; i < pts.size(); ++i, ++ptr )
{
mtp.transformInPlace( ptr->rx(), ptr->ry() );
}
return wkbPtr;
}
bool QgsTriangle::fromWkb( QgsConstWkbPtr &wkbPtr )
{
clear();
if ( !wkbPtr )
{
return false;
}
QgsWkbTypes::Type type = wkbPtr.readHeader();
if ( QgsWkbTypes::flatType( type ) != QgsWkbTypes::Triangle )
{
return false;
}
mWkbType = type;
QgsWkbTypes::Type ringType;
switch ( mWkbType )
{
case QgsWkbTypes::TriangleZ:
ringType = QgsWkbTypes::LineStringZ;
break;
case QgsWkbTypes::TriangleM:
ringType = QgsWkbTypes::LineStringM;
break;
case QgsWkbTypes::TriangleZM:
ringType = QgsWkbTypes::LineStringZM;
break;
default:
ringType = QgsWkbTypes::LineString;
break;
}
int nRings;
wkbPtr >> nRings;
if ( nRings > 1 )
{
return false;
}
QgsLineString *line = new QgsLineString();
line->fromWkbPoints( ringType, wkbPtr );
if ( !mExteriorRing )
{
mExteriorRing = line;
}
return true;
}
bool QgsLineString::fromWkb( QgsConstWkbPtr &wkbPtr )
{
if ( !wkbPtr )
{
return false;
}
QgsWkbTypes::Type type = wkbPtr.readHeader();
if ( QgsWkbTypes::flatType( type ) != QgsWkbTypes::LineString )
{
return false;
}
mWkbType = type;
importVerticesFromWkb( wkbPtr );
return true;
}
bool QgsCircularString::fromWkb( QgsConstWkbPtr &wkbPtr )
{
if ( !wkbPtr )
return false;
QgsWkbTypes::Type type = wkbPtr.readHeader();
if ( QgsWkbTypes::flatType( type ) != QgsWkbTypes::CircularString )
{
return false;
}
clearCache();
mWkbType = type;
//type
bool hasZ = is3D();
bool hasM = isMeasure();
int nVertices = 0;
wkbPtr >> nVertices;
mX.resize( nVertices );
mY.resize( nVertices );
hasZ ? mZ.resize( nVertices ) : mZ.clear();
hasM ? mM.resize( nVertices ) : mM.clear();
for ( int i = 0; i < nVertices; ++i )
{
wkbPtr >> mX[i];
wkbPtr >> mY[i];
if ( hasZ )
{
wkbPtr >> mZ[i];
}
if ( hasM )
{
wkbPtr >> mM[i];
}
}
return true;
}
std::unique_ptr<QgsAbstractGeometry> QgsGeometryFactory::geomFromWkb( QgsConstWkbPtr &wkbPtr )
{
if ( !wkbPtr )
return nullptr;
//find out type (bytes 2-5)
QgsWkbTypes::Type type = QgsWkbTypes::Unknown;
try
{
type = wkbPtr.readHeader();
}
catch ( const QgsWkbException &e )
{
Q_UNUSED( e );
QgsDebugMsg( "WKB exception while reading header: " + e.what() );
return nullptr;
}
wkbPtr -= 1 + sizeof( int );
std::unique_ptr< QgsAbstractGeometry > geom = geomFromWkbType( type );
if ( geom )
{
try
{
geom->fromWkb( wkbPtr ); // also updates wkbPtr
}
catch ( const QgsWkbException &e )
{
Q_UNUSED( e );
QgsDebugMsg( "WKB exception: " + e.what() );
geom.reset();
}
}
return geom;
}
bool QgsGeometryCollection::fromWkb( QgsConstWkbPtr &wkbPtr )
{
if ( !wkbPtr )
{
return false;
}
QgsWkbTypes::Type wkbType = wkbPtr.readHeader();
if ( QgsWkbTypes::flatType( wkbType ) != QgsWkbTypes::flatType( mWkbType ) )
return false;
mWkbType = wkbType;
int nGeometries = 0;
wkbPtr >> nGeometries;
QVector<QgsAbstractGeometry *> geometryListBackup = mGeometries;
mGeometries.clear();
for ( int i = 0; i < nGeometries; ++i )
{
std::unique_ptr< QgsAbstractGeometry > geom( QgsGeometryFactory::geomFromWkb( wkbPtr ) ); // also updates wkbPtr
if ( geom )
{
if ( !addGeometry( geom.release() ) )
{
qDeleteAll( mGeometries );
mGeometries = geometryListBackup;
return false;
}
}
}
qDeleteAll( geometryListBackup );
clearCache(); //set bounding box invalid
return true;
}
QgsConstWkbPtr QgsSymbolV2::_getPolygon( QPolygonF &pts, QList<QPolygonF> &holes, QgsRenderContext &context, QgsConstWkbPtr wkbPtr, bool clipToExtent )
{
QgsWKBTypes::Type wkbType = wkbPtr.readHeader();
QgsDebugMsg( QString( "wkbType=%1" ).arg( wkbType ) );
unsigned int numRings;
wkbPtr >> numRings;
if ( numRings == 0 ) // sanity check for zero rings in polygon
return wkbPtr;
holes.clear();
const QgsCoordinateTransform* ct = context.coordinateTransform();
const QgsMapToPixel& mtp = context.mapToPixel();
const QgsRectangle& e = context.extent();
double cw = e.width() / 10;
double ch = e.height() / 10;
QgsRectangle clipRect( e.xMinimum() - cw, e.yMinimum() - ch, e.xMaximum() + cw, e.yMaximum() + ch );
int skipZM = ( QgsWKBTypes::coordDimensions( wkbType ) - 2 ) * sizeof( double );
Q_ASSERT( skipZM >= 0 );
for ( unsigned int idx = 0; idx < numRings; idx++ )
{
unsigned int nPoints;
wkbPtr >> nPoints;
QPolygonF poly( nPoints );
QPointF *ptr = poly.data();
for ( unsigned int jdx = 0; jdx < nPoints; ++jdx, ++ptr )
{
wkbPtr >> ptr->rx() >> ptr->ry();
wkbPtr += skipZM;
}
if ( nPoints < 1 )
continue;
//clip close to view extent, if needed
QRectF ptsRect = poly.boundingRect();
if ( clipToExtent && !context.extent().contains( ptsRect ) )
{
QgsClipper::trimPolygon( poly, clipRect );
}
//transform the QPolygonF to screen coordinates
if ( ct )
{
ct->transformPolygon( poly );
}
ptr = poly.data();
for ( int i = 0; i < poly.size(); ++i, ++ptr )
{
mtp.transformInPlace( ptr->rx(), ptr->ry() );
}
if ( idx == 0 )
pts = poly;
else
holes.append( poly );
}
return wkbPtr;
}
//! Simplify the WKB-geometry using the specified tolerance
bool QgsMapToPixelSimplifier::simplifyWkbGeometry(
int simplifyFlags,
SimplifyAlgorithm simplifyAlgorithm,
QGis::WkbType wkbType,
QgsConstWkbPtr sourceWkbPtr,
QgsWkbPtr targetWkbPtr,
int &targetWkbSize,
const QgsRectangle &envelope, double map2pixelTol,
bool writeHeader, bool isaLinearRing )
{
bool isGeneralizable = true;
bool result = false;
// Save initial WKB settings to use when the simplification creates invalid geometries
QgsConstWkbPtr sourcePrevWkbPtr( sourceWkbPtr );
QgsWkbPtr targetPrevWkbPtr( targetWkbPtr );
int targetWkbPrevSize = targetWkbSize;
// Can replace the geometry by its BBOX ?
if (( simplifyFlags & QgsMapToPixelSimplifier::SimplifyEnvelope ) &&
isGeneralizableByMapBoundingBox( envelope, map2pixelTol ) )
{
isGeneralizable = generalizeWkbGeometryByBoundingBox( wkbType, sourceWkbPtr, targetWkbPtr, targetWkbSize, envelope, writeHeader );
if ( isGeneralizable )
return true;
}
if ( !( simplifyFlags & QgsMapToPixelSimplifier::SimplifyGeometry ) )
isGeneralizable = false;
// Write the main header of the geometry
if ( writeHeader )
{
QgsWKBTypes::Type geometryType = sourceWkbPtr.readHeader();
targetWkbPtr << ( char ) QgsApplication::endian() << QgsWKBTypes::flatType( geometryType );
targetWkbSize += targetWkbPtr - targetPrevWkbPtr;
}
unsigned int flatType = QGis::flatType( wkbType );
// Write the geometry
if ( flatType == QGis::WKBLineString || isaLinearRing )
{
QgsWkbPtr savedTargetWkbPtr( targetWkbPtr );
double x = 0.0, y = 0.0, lastX = 0, lastY = 0;
QgsRectangle r;
r.setMinimal();
int skipZM = ( QGis::wkbDimensions( wkbType ) - 2 ) * sizeof( double );
Q_ASSERT( skipZM >= 0 );
int numPoints;
sourceWkbPtr >> numPoints;
if ( numPoints <= ( isaLinearRing ? 5 : 2 ) )
isGeneralizable = false;
QgsWkbPtr numPtr( targetWkbPtr );
int numTargetPoints = 0;
targetWkbPtr << numTargetPoints;
targetWkbSize += 4;
bool isLongSegment;
bool hasLongSegments = false; //-> To avoid replace the simplified geometry by its BBOX when there are 'long' segments.
bool badLuck = false;
// Check whether the LinearRing is really closed.
if ( isaLinearRing )
{
QgsConstWkbPtr checkPtr( sourceWkbPtr );
double x1, y1, x2, y2;
checkPtr >> x1 >> y1;
checkPtr += skipZM + ( numPoints - 2 ) * ( 2 * sizeof( double ) + skipZM );
checkPtr >> x2 >> y2;
isaLinearRing = qgsDoubleNear( x1, x2 ) && qgsDoubleNear( y1, y2 );
}
// Process each vertex...
if ( simplifyAlgorithm == SnapToGrid )
{
double gridOriginX = envelope.xMinimum();
double gridOriginY = envelope.yMinimum();
// Use a factor for the maximum displacement distance for simplification, similar as GeoServer does
float gridInverseSizeXY = map2pixelTol != 0 ? ( float )( 1.0f / ( 0.8 * map2pixelTol ) ) : 0.0f;
for ( int i = 0; i < numPoints; ++i )
{
sourceWkbPtr >> x >> y;
sourceWkbPtr += skipZM;
if ( i == 0 ||
!isGeneralizable ||
!equalSnapToGrid( x, y, lastX, lastY, gridOriginX, gridOriginY, gridInverseSizeXY ) ||
( !isaLinearRing && ( i == 1 || i >= numPoints - 2 ) ) )
{
targetWkbPtr << x << y;
lastX = x;
lastY = y;
numTargetPoints++;
}
r.combineExtentWith( x, y );
}
}
QgsConstWkbPtr QgsClipper::clippedLineWKB( QgsConstWkbPtr& wkbPtr, const QgsRectangle& clipExtent, QPolygonF& line )
{
QgsWKBTypes::Type wkbType = wkbPtr.readHeader();
int nPoints;
wkbPtr >> nPoints;
int skipZM = ( QgsWKBTypes::coordDimensions( wkbType ) - 2 ) * sizeof( double );
if ( static_cast<int>( nPoints * ( 2 * sizeof( double ) + skipZM ) ) > wkbPtr.remaining() )
{
QgsDebugMsg( QString( "%1 points exceed wkb length (%2>%3)" ).arg( nPoints ).arg( nPoints * ( 2 * sizeof( double ) + skipZM ) ).arg( wkbPtr.remaining() ) );
return QgsConstWkbPtr( nullptr, 0 );
}
double p0x, p0y, p1x = 0.0, p1y = 0.0; //original coordinates
double p1x_c, p1y_c; //clipped end coordinates
double lastClipX = 0.0, lastClipY = 0.0; //last successfully clipped coords
QPolygonF pts;
wkbPtr -= sizeof( unsigned int );
wkbPtr >> pts;
nPoints = pts.size();
line.clear();
line.reserve( nPoints + 1 );
QPointF *ptr = pts.data();
for ( int i = 0; i < nPoints; ++i, ++ptr )
{
if ( i == 0 )
{
p1x = ptr->rx();
p1y = ptr->ry();
continue;
}
else
{
p0x = p1x;
p0y = p1y;
p1x = ptr->rx();
p1y = ptr->ry();
p1x_c = p1x;
p1y_c = p1y;
if ( clipLineSegment( clipExtent.xMinimum(), clipExtent.xMaximum(), clipExtent.yMinimum(), clipExtent.yMaximum(),
p0x, p0y, p1x_c, p1y_c ) )
{
bool newLine = !line.isEmpty() && ( !qgsDoubleNear( p0x, lastClipX ) || !qgsDoubleNear( p0y, lastClipY ) );
if ( newLine )
{
//add edge points to connect old and new line
connectSeparatedLines( lastClipX, lastClipY, p0x, p0y, clipExtent, line );
}
if ( line.size() < 1 || newLine )
{
//add first point
line << QPointF( p0x, p0y );
}
//add second point
lastClipX = p1x_c;
lastClipY = p1y_c;
line << QPointF( p1x_c, p1y_c );
}
}
}
return wkbPtr;
}
QgsConstWkbPtr QgsDistanceArea::measurePolygon( QgsConstWkbPtr wkbPtr, double* area, double* perimeter, bool hasZptr ) const
{
if ( !wkbPtr )
{
QgsDebugMsg( "no feature to measure" );
return wkbPtr;
}
wkbPtr.readHeader();
// get number of rings in the polygon
int numRings;
wkbPtr >> numRings;
if ( numRings == 0 )
{
QgsDebugMsg( "no rings to measure" );
return QgsConstWkbPtr( nullptr, 0 );
}
// Set pointer to the first ring
QList<QgsPoint> points;
QgsPoint pnt;
double x, y;
if ( area )
*area = 0;
if ( perimeter )
*perimeter = 0;
try
{
for ( int idx = 0; idx < numRings; idx++ )
{
int nPoints;
wkbPtr >> nPoints;
// Extract the points from the WKB and store in a pair of
// vectors.
for ( int jdx = 0; jdx < nPoints; jdx++ )
{
wkbPtr >> x >> y;
if ( hasZptr )
{
// totally ignore Z value
wkbPtr += sizeof( double );
}
pnt = QgsPoint( x, y );
if ( mEllipsoidalMode && ( mEllipsoid != GEO_NONE ) )
{
pnt = mCoordTransform.transform( pnt );
}
points.append( pnt );
}
if ( points.size() > 2 )
{
if ( area )
{
double areaTmp = computePolygonArea( points );
if ( idx == 0 )
{
// exterior ring
*area += areaTmp;
}
else
{
*area -= areaTmp; // interior rings
}
}
if ( perimeter )
{
if ( idx == 0 )
{
// exterior ring
*perimeter += computeDistance( points );
}
}
}
points.clear();
}
}
catch ( QgsCsException &cse )
{
Q_UNUSED( cse );
QgsMessageLog::logMessage( QObject::tr( "Caught a coordinate system exception while trying to transform a point. Unable to calculate polygon area or perimeter." ) );
}
return wkbPtr;
}