ADD GML export to QgsTriangle

Author: lbartoletti

python/core/geometry/qgstriangle.sip

@@ -68,6 +68,14 @@ class QgsTriangle : QgsPolygonV2
     virtual bool fromWkt( const QString &wkt );
 
 
+    QDomElement asGML2( QDomDocument &doc, int precision = 17, const QString &ns = "gml" ) const;
+%Docstring
+ :rtype: QDomElement
+%End
+    QDomElement asGML3( QDomDocument &doc, int precision = 17, const QString &ns = "gml" ) const;
+%Docstring
+ :rtype: QDomElement
+%End
 
     virtual QgsPolygonV2 *surfaceToPolygon() const /Factory/;
 

src/core/geometry/qgstriangle.cpp

@@ -224,6 +224,44 @@ bool QgsTriangle::fromWkt( const QString &wkt )
   return true;
 }
 
+QDomElement QgsTriangle::asGML2( QDomDocument &doc, int precision, const QString &ns ) const
+{
+  if ( !isEmpty() )  /* else crash */
+    return QgsPolygonV2::asGML2( doc, precision, ns );
+
+  return QDomElement(); /* Crash: "QgsPolygonV2().asGML2( doc, precision, ns )"*/
+}
+
+QDomElement QgsTriangle::asGML3( QDomDocument &doc, int precision, const QString &ns ) const
+{
+  if ( isEmpty() ) /* else crash */
+    return QDomElement();
+
+  QDomElement elemCurveTriangle = doc.createElementNS( ns, QStringLiteral( "Triangle" ) );
+  QDomElement elemExterior = doc.createElementNS( ns, QStringLiteral( "exterior" ) );
+  QDomElement curveElem = exteriorRing()->asGML3( doc, precision, ns );
+  if ( curveElem.tagName() == QLatin1String( "LineString" ) )
+  {
+    curveElem.setTagName( QStringLiteral( "LinearRing" ) );
+  }
+  elemExterior.appendChild( curveElem );
+  elemCurveTriangle.appendChild( elemExterior );
+
+  /* No interior ring for triangle
+  for ( int i = 0, n = numInteriorRings(); i < n; ++i )
+  {
+    QDomElement elemInterior = doc.createElementNS( ns, QStringLiteral( "interior" ) );
+    QDomElement innerRing = interiorRing( i )->asGML3( doc, precision, ns );
+    if ( innerRing.tagName() == QLatin1String( "LineString" ) )
+    {
+      innerRing.setTagName( QStringLiteral( "LinearRing" ) );
+    }
+    elemInterior.appendChild( innerRing );
+    elemCurveTriangle.appendChild( elemInterior );
+  }*/
+  return elemCurveTriangle;
+}
+
 QgsPolygonV2 *QgsTriangle::surfaceToPolygon() const
 {
   return toPolygon();

src/core/geometry/qgstriangle.h

@@ -74,8 +74,8 @@ class CORE_EXPORT QgsTriangle : public QgsPolygonV2
     bool fromWkt( const QString &wkt ) override;
 
     // inherited: QString asWkt( int precision = 17 ) const;
-    // inherited: QDomElement asGML2( QDomDocument& doc, int precision = 17, const QString& ns = "gml" ) const;
-    // inherited: QDomElement asGML3( QDomDocument& doc, int precision = 17, const QString& ns = "gml" ) const;
+    QDomElement asGML2( QDomDocument &doc, int precision = 17, const QString &ns = "gml" ) const;
+    QDomElement asGML3( QDomDocument &doc, int precision = 17, const QString &ns = "gml" ) const;
     // inherited: QString asJSON( int precision = 17 ) const;
 
     QgsPolygonV2 *surfaceToPolygon() const override SIP_FACTORY;

tests/src/core/testqgsgeometry.cpp

@@ -5959,6 +5959,32 @@ void TestQgsGeometry::triangle()
   QVERIFY( !t6.fromWkb( wkbPointPtr ) );
   QCOMPARE( t6.wkbType(), QgsWkbTypes::Triangle );
 
+  //asGML2
+  QgsTriangle exportEmptyTriangle( QgsPoint( 1, 2 ),
+                                   QgsPoint( 3, 4 ),
+                                   QgsPoint( 5, 6 ) );
+  QgsTriangle exportTriangle( QgsPoint( 1, 2 ),
+                              QgsPoint( 3, 4 ),
+                              QgsPoint( 6, 5 ) );
+  QgsTriangle exportTriangleFloat( QgsPoint( 1 + 1 / 3.0, 2 + 2 / 3.0 ),
+                                   QgsPoint( 3 + 1 / 3.0, 4 + 2 / 3.0 ),
+                                   QgsPoint( 6 + 1 / 3.0, 5 + 2 / 3.0 ) );
+  QDomDocument doc( QStringLiteral( "gml" ) );
+  QString expectedGML2( QStringLiteral( "<Polygon xmlns=\"gml\"><outerBoundaryIs xmlns=\"gml\"><LinearRing xmlns=\"gml\"><coordinates xmlns=\"gml\" cs=\",\" ts=\" \">1,2 3,4 6,5 1,2</coordinates></LinearRing></outerBoundaryIs></Polygon>" ) );
+  QGSCOMPAREGML( elemToString( exportTriangle.asGML2( doc ) ), expectedGML2 );
+  QString expectedGML2prec3( QStringLiteral( "<Polygon xmlns=\"gml\"><outerBoundaryIs xmlns=\"gml\"><LinearRing xmlns=\"gml\"><coordinates xmlns=\"gml\" cs=\",\" ts=\" \">1.333,2.667 3.333,4.667 6.333,5.667 1.333,2.667</coordinates></LinearRing></outerBoundaryIs></Polygon>" ) );
+  QGSCOMPAREGML( elemToString( exportTriangleFloat.asGML2( doc, 3 ) ), expectedGML2prec3 );
+  QString expectedGML2empty( QStringLiteral( "" ) ); // TODO: FIXME?
+  QGSCOMPAREGML( elemToString( exportEmptyTriangle.asGML2( doc ) ), expectedGML2empty );
+
+  //asGML3
+  QString expectedGML3( QStringLiteral( "<Triangle xmlns=\"gml\"><exterior xmlns=\"gml\"><LinearRing xmlns=\"gml\"><posList xmlns=\"gml\" srsDimension=\"2\">1 2 3 4 6 5 1 2</posList></LinearRing></exterior></Triangle>" ) );
+  QCOMPARE( elemToString( exportTriangle.asGML3( doc ) ), expectedGML3 );
+  QString expectedGML3prec3( QStringLiteral( "<Triangle xmlns=\"gml\"><exterior xmlns=\"gml\"><LinearRing xmlns=\"gml\"><posList xmlns=\"gml\" srsDimension=\"2\">1.333 2.667 3.333 4.667 6.333 5.667 1.333 2.667</posList></LinearRing></exterior></Triangle>" ) );
+  QCOMPARE( elemToString( exportTriangleFloat.asGML3( doc, 3 ) ), expectedGML3prec3 );
+  QString expectedGML3empty( QStringLiteral( "" ) ); // TODO: FIXME?
+  QGSCOMPAREGML( elemToString( exportEmptyTriangle.asGML3( doc ) ), expectedGML3empty );
+
   // lengths and angles
   QgsTriangle t7( QgsPoint( 0, 0 ), QgsPoint( 0, 5 ), QgsPoint( 5, 5 ) );