Add QgsAbstractGeometry::asKml

qgis · Jan 16, 2020 · 6c32a6a · 6c32a6a
1 parent 34d3aaa
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diff --git a/python/core/auto_generated/geometry/qgsabstractgeometry.sip.in b/python/core/auto_generated/geometry/qgsabstractgeometry.sip.in
@@ -273,6 +273,13 @@ Returns a GeoJSON representation of the geometry as a QString.
 %End
 
 
+    virtual QString asKml( int precision = 17 ) const = 0;
+%Docstring
+Returns a KML representation of the geometry.
+
+.. versionadded:: 3.12
+%End
+
 
 
     virtual void transform( const QgsCoordinateTransform &ct, QgsCoordinateTransform::TransformDirection d = QgsCoordinateTransform::ForwardTransform, bool transformZ = false ) throw( QgsCsException ) = 0;

diff --git a/python/core/auto_generated/geometry/qgscurve.sip.in b/python/core/auto_generated/geometry/qgscurve.sip.in
@@ -150,6 +150,9 @@ Returns a reversed copy of the curve, where the direction of the curve has been
     virtual QgsAbstractGeometry *boundary() const /Factory/;
 
 
+    virtual QString asKml( int precision = 17 ) const;
+
+
     virtual QgsCurve *segmentize( double tolerance = M_PI_2 / 90, SegmentationToleranceType toleranceType = MaximumAngle ) const /Factory/;
 
 %Docstring

diff --git a/python/core/auto_generated/geometry/qgscurvepolygon.sip.in b/python/core/auto_generated/geometry/qgscurvepolygon.sip.in
@@ -54,6 +54,8 @@ Curve polygon geometry type
 
     virtual QDomElement asGml3( QDomDocument &doc, int precision = 17, const QString &ns = "gml", QgsAbstractGeometry::AxisOrder axisOrder = QgsAbstractGeometry::AxisOrder::XY ) const;
 
+    virtual QString asKml( int precision = 17 ) const;
+
 
     virtual double area() const;
 

diff --git a/python/core/auto_generated/geometry/qgsgeometrycollection.sip.in b/python/core/auto_generated/geometry/qgsgeometrycollection.sip.in
@@ -162,6 +162,8 @@ An IndexError will be raised if no geometry with the specified index exists.
 
     virtual QDomElement asGml3( QDomDocument &doc, int precision = 17, const QString &ns = "gml", QgsAbstractGeometry::AxisOrder axisOrder = QgsAbstractGeometry::AxisOrder::XY ) const;
 
+    virtual QString asKml( int precision = 17 ) const;
+
 
     virtual QgsRectangle boundingBox() const;
 

diff --git a/python/core/auto_generated/geometry/qgslinestring.sip.in b/python/core/auto_generated/geometry/qgslinestring.sip.in
@@ -431,6 +431,8 @@ segment in the line.
 
     virtual QDomElement asGml3( QDomDocument &doc, int precision = 17, const QString &ns = "gml", QgsAbstractGeometry::AxisOrder axisOrder = QgsAbstractGeometry::AxisOrder::XY ) const;
 
+    virtual QString asKml( int precision = 17 ) const;
+
 
     virtual double length() const;
 

diff --git a/python/core/auto_generated/geometry/qgspoint.sip.in b/python/core/auto_generated/geometry/qgspoint.sip.in
@@ -369,6 +369,8 @@ M value is preserved.
 
     virtual QDomElement asGml3( QDomDocument &doc, int precision = 17, const QString &ns = "gml", QgsAbstractGeometry::AxisOrder axisOrder = QgsAbstractGeometry::AxisOrder::XY ) const;
 
+    virtual QString asKml( int precision = 17 ) const;
+
     virtual void draw( QPainter &p ) const;
 
     virtual void transform( const QgsCoordinateTransform &ct, QgsCoordinateTransform::TransformDirection d = QgsCoordinateTransform::ForwardTransform, bool transformZ = false ) throw( QgsCsException );

diff --git a/src/core/geometry/qgsabstractgeometry.h b/src/core/geometry/qgsabstractgeometry.h
@@ -307,6 +307,12 @@ class CORE_EXPORT QgsAbstractGeometry
      */
     virtual json asJsonObject( int precision = 17 ) SIP_SKIP const;
 
+    /**
+     * Returns a KML representation of the geometry.
+     * \since QGIS 3.12
+     */
+    virtual QString asKml( int precision = 17 ) const = 0;
+
 
     //render pipeline
 

diff --git a/src/core/geometry/qgscurve.cpp b/src/core/geometry/qgscurve.cpp
@@ -145,6 +145,17 @@ QgsAbstractGeometry *QgsCurve::boundary() const
   return multiPoint;
 }
 
+QString QgsCurve::asKml( int precision ) const
+{
+  std::unique_ptr<QgsLineString> lineString( curveToLine() );
+  if ( !lineString )
+  {
+    return QString();
+  }
+  QString kml = lineString->asKml( precision );
+  return kml;
+}
+
 QgsCurve *QgsCurve::segmentize( double tolerance, SegmentationToleranceType toleranceType ) const
 {
   return curveToLine( tolerance, toleranceType );

diff --git a/src/core/geometry/qgscurve.h b/src/core/geometry/qgscurve.h
@@ -149,6 +149,8 @@ class CORE_EXPORT QgsCurve: public QgsAbstractGeometry
 
     QgsAbstractGeometry *boundary() const override SIP_FACTORY;
 
+    QString asKml( int precision = 17 ) const override;
+
     /**
      * Returns a geometry without curves. Caller takes ownership
      * \param tolerance segmentation tolerance

diff --git a/src/core/geometry/qgscurvepolygon.cpp b/src/core/geometry/qgscurvepolygon.cpp
@@ -437,6 +437,27 @@ json QgsCurvePolygon::asJsonObject( int precision ) const
   };
 }
 
+QString QgsCurvePolygon::asKml( int precision ) const
+{
+  QString kml;
+  kml.append( QLatin1String( "<Polygon>" ) );
+  if ( mExteriorRing )
+  {
+    kml.append( QLatin1String( "<outerBoundaryIs>" ) );
+    kml.append( mExteriorRing->asKml( precision ) );
+    kml.append( QLatin1String( "</outerBoundaryIs>" ) );
+  }
+  const QVector<QgsCurve *> &interiorRings = mInteriorRings;
+  for ( const QgsCurve *ring : interiorRings )
+  {
+    kml.append( QLatin1String( "<innerBoundaryIs>" ) );
+    kml.append( ring->asKml( precision ) );
+    kml.append( QLatin1String( "</innerBoundaryIs>" ) );
+  }
+  kml.append( QLatin1String( "</Polygon>" ) );
+  return kml;
+}
+
 double QgsCurvePolygon::area() const
 {
   if ( !mExteriorRing )

diff --git a/src/core/geometry/qgscurvepolygon.h b/src/core/geometry/qgscurvepolygon.h
@@ -56,6 +56,7 @@ class CORE_EXPORT QgsCurvePolygon: public QgsSurface
     QDomElement asGml2( QDomDocument &doc, int precision = 17, const QString &ns = "gml", QgsAbstractGeometry::AxisOrder axisOrder = QgsAbstractGeometry::AxisOrder::XY ) const override;
     QDomElement asGml3( QDomDocument &doc, int precision = 17, const QString &ns = "gml", QgsAbstractGeometry::AxisOrder axisOrder = QgsAbstractGeometry::AxisOrder::XY ) const override;
     json asJsonObject( int precision = 17 ) const override SIP_SKIP;
+    QString asKml( int precision = 17 ) const override;
 
     //surface interface
     double area() const override;

diff --git a/src/core/geometry/qgsgeometrycollection.cpp b/src/core/geometry/qgsgeometrycollection.cpp
@@ -445,6 +445,19 @@ json QgsGeometryCollection::asJsonObject( int precision ) const
   };
 }
 
+QString QgsGeometryCollection::asKml( int precision ) const
+{
+  QString kml;
+  kml.append( QLatin1String( "<MultiGeometry>" ) );
+  const QVector< QgsAbstractGeometry * > &geometries = mGeometries;
+  for ( const QgsAbstractGeometry *geometry : geometries )
+  {
+    kml.append( geometry->asKml( precision ) );
+  }
+  kml.append( QLatin1String( "</MultiGeometry>" ) );
+  return kml;
+}
+
 QgsRectangle QgsGeometryCollection::boundingBox() const
 {
   if ( mBoundingBox.isNull() )

diff --git a/src/core/geometry/qgsgeometrycollection.h b/src/core/geometry/qgsgeometrycollection.h
@@ -184,6 +184,7 @@ class CORE_EXPORT QgsGeometryCollection: public QgsAbstractGeometry
     QDomElement asGml2( QDomDocument &doc, int precision = 17, const QString &ns = "gml", QgsAbstractGeometry::AxisOrder axisOrder = QgsAbstractGeometry::AxisOrder::XY ) const override;
     QDomElement asGml3( QDomDocument &doc, int precision = 17, const QString &ns = "gml", QgsAbstractGeometry::AxisOrder axisOrder = QgsAbstractGeometry::AxisOrder::XY ) const override;
     json asJsonObject( int precision = 17 ) const override SIP_SKIP;
+    QString asKml( int precision = 17 ) const override;
 
     QgsRectangle boundingBox() const override;
 

diff --git a/src/core/geometry/qgslinestring.cpp b/src/core/geometry/qgslinestring.cpp
@@ -518,6 +518,62 @@ json QgsLineString::asJsonObject( int precision ) const
   };
 }
 
+QString QgsLineString::asKml( int precision ) const
+{
+  QString kml;
+  if ( isRing() )
+  {
+    kml.append( QLatin1String( "<LinearRing>" ) );
+  }
+  else
+  {
+    kml.append( QLatin1String( "<LineString>" ) );
+  }
+  bool z = is3D();
+  kml.append( QLatin1String( "<altitudeMode>" ) );
+  if ( z )
+  {
+    kml.append( QLatin1String( "absolute" ) );
+  }
+  else
+  {
+    kml.append( QLatin1String( "clampToGround" ) );
+  }
+  kml.append( QLatin1String( "</altitudeMode>" ) );
+  kml.append( QLatin1String( "<coordinates>" ) );
+
+  int nPoints = mX.size();
+  for ( int i = 0; i < nPoints; ++i )
+  {
+    if ( i > 0 )
+    {
+      kml.append( QLatin1String( " " ) );
+    }
+    kml.append( qgsDoubleToString( mX[i], precision ) );
+    kml.append( QLatin1String( "," ) );
+    kml.append( qgsDoubleToString( mY[i], precision ) );
+    if ( z )
+    {
+      kml.append( QLatin1String( "," ) );
+      kml.append( qgsDoubleToString( mZ[i], precision ) );
+    }
+    else
+    {
+      kml.append( QLatin1String( ",0" ) );
+    }
+  }
+  kml.append( QLatin1String( "</coordinates>" ) );
+  if ( isRing() )
+  {
+    kml.append( QLatin1String( "</LinearRing>" ) );
+  }
+  else
+  {
+    kml.append( QLatin1String( "</LineString>" ) );
+  }
+  return kml;
+}
+
 /***************************************************************************
  * This class is considered CRITICAL and any change MUST be accompanied with
  * full unit tests.

diff --git a/src/core/geometry/qgslinestring.h b/src/core/geometry/qgslinestring.h
@@ -580,6 +580,7 @@ class CORE_EXPORT QgsLineString: public QgsCurve
     QDomElement asGml2( QDomDocument &doc, int precision = 17, const QString &ns = "gml", QgsAbstractGeometry::AxisOrder axisOrder = QgsAbstractGeometry::AxisOrder::XY ) const override;
     QDomElement asGml3( QDomDocument &doc, int precision = 17, const QString &ns = "gml", QgsAbstractGeometry::AxisOrder axisOrder = QgsAbstractGeometry::AxisOrder::XY ) const override;
     json asJsonObject( int precision = 17 ) const override SIP_SKIP;
+    QString asKml( int precision = 17 ) const override;
 
     //curve interface
     double length() const override;

diff --git a/src/core/geometry/qgspoint.cpp b/src/core/geometry/qgspoint.cpp
@@ -306,6 +306,11 @@ json QgsPoint::asJsonObject( int precision ) const
   return j;
 }
 
+QString QgsPoint::asKml( int precision ) const
+{
+  return QStringLiteral( "<Point><coordinates>%1,%2</coordinates></Point>" ).arg( qgsDoubleToString( mX, precision ), qgsDoubleToString( mY, precision ) );
+}
+
 void QgsPoint::draw( QPainter &p ) const
 {
   p.drawRect( QRectF( mX - 2, mY - 2, 4, 4 ) );

diff --git a/src/core/geometry/qgspoint.h b/src/core/geometry/qgspoint.h
@@ -488,6 +488,7 @@ class CORE_EXPORT QgsPoint: public QgsAbstractGeometry
     QDomElement asGml2( QDomDocument &doc, int precision = 17, const QString &ns = "gml", QgsAbstractGeometry::AxisOrder axisOrder = QgsAbstractGeometry::AxisOrder::XY ) const override;
     QDomElement asGml3( QDomDocument &doc, int precision = 17, const QString &ns = "gml", QgsAbstractGeometry::AxisOrder axisOrder = QgsAbstractGeometry::AxisOrder::XY ) const override;
     json asJsonObject( int precision = 17 ) const override SIP_SKIP;
+    QString asKml( int precision = 17 ) const override;
     void draw( QPainter &p ) const override;
     void transform( const QgsCoordinateTransform &ct, QgsCoordinateTransform::TransformDirection d = QgsCoordinateTransform::ForwardTransform, bool transformZ = false ) override SIP_THROW( QgsCsException );
     void transform( const QTransform &t, double zTranslate = 0.0, double zScale = 1.0, double mTranslate = 0.0, double mScale = 1.0 ) override;