qgis · lbartoletti · Dec 17, 2025 · Dec 17, 2025 · Dec 17, 2025 · Dec 17, 2025
diff --git a/images/images.qrc b/images/images.qrc
@@ -294,6 +294,7 @@
         <file>themes/default/mActionDeselectActiveLayer.svg</file>
         <file>themes/default/mActionDigitizeShape.svg</file>
         <file>themes/default/mActionDigitizeWithCurve.svg</file>
+        <file>themes/default/mActionDigitizeWithNURBS.svg</file>
         <file>themes/default/mActionDigitizeWithSegment.svg</file>
         <file>themes/default/mActionDuplicateLayer.svg</file>
         <file>themes/default/mActionDuplicateComposer.svg</file>
@@ -744,6 +745,7 @@
         <file>themes/default/mIconSnappingAllLayers.svg</file>
         <file>themes/default/mIconSnappingArea.svg</file>
         <file>themes/default/mIconSnappingCentroid.svg</file>
+        <file>themes/default/mIconSnappingControlPoint.svg</file>
         <file>themes/default/mIconSnappingMiddle.svg</file>
         <file>themes/default/mIconSnappingOnScale.svg</file>
         <file>themes/default/mIconSnappingVertex.svg</file>

diff --git a/images/themes/default/mActionDigitizeWithNURBS.svg b/images/themes/default/mActionDigitizeWithNURBS.svg
diff --git a/images/themes/default/mIconSnappingControlPoint.svg b/images/themes/default/mIconSnappingControlPoint.svg
diff --git a/python/PyQt6/core/auto_additions/qgis.py b/python/PyQt6/core/auto_additions/qgis.py
@@ -325,6 +325,9 @@
 QgsWkbTypes.TIN = Qgis.WkbType.TIN
 QgsWkbTypes.TIN.is_monkey_patched = True
 QgsWkbTypes.TIN.__doc__ = "TIN \n.. versionadded:: 3.40"
+QgsWkbTypes.NurbsCurve = Qgis.WkbType.NurbsCurve
+QgsWkbTypes.NurbsCurve.is_monkey_patched = True
+QgsWkbTypes.NurbsCurve.__doc__ = "NurbsCurve \n.. versionadded:: 4.0"
 QgsWkbTypes.NoGeometry = Qgis.WkbType.NoGeometry
 QgsWkbTypes.NoGeometry.is_monkey_patched = True
 QgsWkbTypes.NoGeometry.__doc__ = "No geometry"
@@ -373,6 +376,9 @@
 QgsWkbTypes.TINZ = Qgis.WkbType.TINZ
 QgsWkbTypes.TINZ.is_monkey_patched = True
 QgsWkbTypes.TINZ.__doc__ = "TINZ"
+QgsWkbTypes.NurbsCurveZ = Qgis.WkbType.NurbsCurveZ
+QgsWkbTypes.NurbsCurveZ.is_monkey_patched = True
+QgsWkbTypes.NurbsCurveZ.__doc__ = "NurbsCurveZ \n.. versionadded:: 4.0"
 QgsWkbTypes.PointM = Qgis.WkbType.PointM
 QgsWkbTypes.PointM.is_monkey_patched = True
 QgsWkbTypes.PointM.__doc__ = "PointM"
@@ -418,6 +424,9 @@
 QgsWkbTypes.TINM = Qgis.WkbType.TINM
 QgsWkbTypes.TINM.is_monkey_patched = True
 QgsWkbTypes.TINM.__doc__ = "TINM"
+QgsWkbTypes.NurbsCurveM = Qgis.WkbType.NurbsCurveM
+QgsWkbTypes.NurbsCurveM.is_monkey_patched = True
+QgsWkbTypes.NurbsCurveM.__doc__ = "NurbsCurveM \n.. versionadded:: 4.0"
 QgsWkbTypes.PointZM = Qgis.WkbType.PointZM
 QgsWkbTypes.PointZM.is_monkey_patched = True
 QgsWkbTypes.PointZM.__doc__ = "PointZM"
@@ -463,6 +472,9 @@
 QgsWkbTypes.TriangleZM = Qgis.WkbType.TriangleZM
 QgsWkbTypes.TriangleZM.is_monkey_patched = True
 QgsWkbTypes.TriangleZM.__doc__ = "TriangleZM"
+QgsWkbTypes.NurbsCurveZM = Qgis.WkbType.NurbsCurveZM
+QgsWkbTypes.NurbsCurveZM.is_monkey_patched = True
+QgsWkbTypes.NurbsCurveZM.__doc__ = "NurbsCurveZM \n.. versionadded:: 4.0"
 QgsWkbTypes.Point25D = Qgis.WkbType.Point25D
 QgsWkbTypes.Point25D.is_monkey_patched = True
 QgsWkbTypes.Point25D.__doc__ = "Point25D"
@@ -531,6 +543,10 @@
 
   .. versionadded:: 3.40
 
+* ``NurbsCurve``: NurbsCurve
+
+  .. versionadded:: 4.0
+
 * ``NoGeometry``: No geometry
 * ``PointZ``: PointZ
 * ``LineStringZ``: LineStringZ
@@ -547,6 +563,10 @@
 * ``MultiSurfaceZ``: MultiSurfaceZ
 * ``PolyhedralSurfaceZ``: PolyhedralSurfaceZ
 * ``TINZ``: TINZ
+* ``NurbsCurveZ``: NurbsCurveZ
+
+  .. versionadded:: 4.0
+
 * ``PointM``: PointM
 * ``LineStringM``: LineStringM
 * ``PolygonM``: PolygonM
@@ -562,6 +582,10 @@
 * ``MultiSurfaceM``: MultiSurfaceM
 * ``PolyhedralSurfaceM``: PolyhedralSurfaceM
 * ``TINM``: TINM
+* ``NurbsCurveM``: NurbsCurveM
+
+  .. versionadded:: 4.0
+
 * ``PointZM``: PointZM
 * ``LineStringZM``: LineStringZM
 * ``PolygonZM``: PolygonZM
@@ -577,6 +601,10 @@
 * ``PolyhedralSurfaceZM``: PolyhedralSurfaceM
 * ``TINZM``: TINZM
 * ``TriangleZM``: TriangleZM
+* ``NurbsCurveZM``: NurbsCurveZM
+
+  .. versionadded:: 4.0
+
 * ``Point25D``: Point25D
 * ``LineString25D``: LineString25D
 * ``Polygon25D``: Polygon25D
@@ -715,6 +743,7 @@
 Qgis.CaptureTechnique.CircularString.__doc__ = "Capture in circular strings"
 Qgis.CaptureTechnique.Streaming.__doc__ = "Streaming points digitizing mode (points are automatically added as the mouse cursor moves)."
 Qgis.CaptureTechnique.Shape.__doc__ = "Digitize shapes."
+Qgis.CaptureTechnique.NurbsCurve.__doc__ = "Digitizes NURBS curves with control points. \n.. versionadded:: 4.0"
 Qgis.CaptureTechnique.__doc__ = """Capture technique.
 
 .. versionadded:: 3.26
@@ -723,11 +752,28 @@
 * ``CircularString``: Capture in circular strings
 * ``Streaming``: Streaming points digitizing mode (points are automatically added as the mouse cursor moves).
 * ``Shape``: Digitize shapes.
+* ``NurbsCurve``: Digitizes NURBS curves with control points.
+
+  .. versionadded:: 4.0
+
 
 """
 # --
 Qgis.CaptureTechnique.baseClass = Qgis
 # monkey patching scoped based enum
+Qgis.NurbsMode.ControlPoints.__doc__ = "Direct control points mode - the curve is attracted to control points but does not pass through them"
+Qgis.NurbsMode.PolyBezier.__doc__ = "Poly-Bézier mode (vector graphics style) - anchors with tangent handles, the curve passes through anchor points"
+Qgis.NurbsMode.__doc__ = """NURBS digitizing mode.
+
+.. versionadded:: 4.0
+
+* ``ControlPoints``: Direct control points mode - the curve is attracted to control points but does not pass through them
+* ``PolyBezier``: Poly-Bézier mode (vector graphics style) - anchors with tangent handles, the curve passes through anchor points
+
+"""
+# --
+Qgis.NurbsMode.baseClass = Qgis
+# monkey patching scoped based enum
 Qgis.VectorLayerTypeFlag.SqlQuery.__doc__ = "SQL query layer"
 Qgis.VectorLayerTypeFlag.__doc__ = """Vector layer type flags.
 
@@ -1390,6 +1436,9 @@
 QgsSnappingConfig.SnappingTypes.LineEndpointFlag = Qgis.SnappingType.LineEndpoint
 QgsSnappingConfig.LineEndpointFlag.is_monkey_patched = True
 QgsSnappingConfig.LineEndpointFlag.__doc__ = "Start or end points of lines, or first vertex in polygon rings only \n.. versionadded:: 3.20"
+QgsSnappingConfig.ControlPoint = Qgis.SnappingType.ControlPoint
+QgsSnappingConfig.ControlPoint.is_monkey_patched = True
+QgsSnappingConfig.ControlPoint.__doc__ = "On control points (for NURBS curves) \n.. versionadded:: 4.0"
 Qgis.SnappingType.__doc__ = """SnappingTypeFlag defines on what object the snapping is performed
 
 .. versionadded:: 3.26
@@ -1425,6 +1474,10 @@
 
   Available as ``QgsSnappingConfig.LineEndpointFlag`` in older QGIS releases.
 
+* ``ControlPoint``: On control points (for NURBS curves)
+
+  .. versionadded:: 4.0
+
 
 """
 # --
@@ -5672,6 +5725,10 @@
 QgsVertexId.VertexType.CurveVertex = Qgis.VertexType.Curve
 QgsVertexId.CurveVertex.is_monkey_patched = True
 QgsVertexId.CurveVertex.__doc__ = "An intermediate point on a segment defining the curvature of the segment"
+QgsVertexId.ControlPointVertex = Qgis.VertexType.ControlPoint
+QgsVertexId.VertexType.ControlPointVertex = Qgis.VertexType.ControlPoint
+QgsVertexId.ControlPointVertex.is_monkey_patched = True
+QgsVertexId.ControlPointVertex.__doc__ = "A NURBS control point (does not lie on the curve) \n.. versionadded:: 4.0"
 Qgis.VertexType.__doc__ = """Types of vertex.
 
 .. versionadded:: 3.22
@@ -5684,6 +5741,13 @@
 
   Available as ``QgsVertexId.CurveVertex`` in older QGIS releases.
 
+* ``ControlPoint``: A NURBS control point (does not lie on the curve)
+
+  .. versionadded:: 4.0
+
+
+  Available as ``QgsVertexId.ControlPointVertex`` in older QGIS releases.
+
 
 """
 # --

diff --git a/python/PyQt6/core/auto_additions/qgsgeometryutils.py b/python/PyQt6/core/auto_additions/qgsgeometryutils.py
@@ -14,6 +14,7 @@
     QgsGeometryUtils.projectPointOnSegment = staticmethod(QgsGeometryUtils.projectPointOnSegment)
     QgsGeometryUtils.leftOfLine = staticmethod(QgsGeometryUtils.leftOfLine)
     QgsGeometryUtils.interpolatePointOnArc = staticmethod(QgsGeometryUtils.interpolatePointOnArc)
+    QgsGeometryUtils.interpolatePointOnCubicBezier = staticmethod(QgsGeometryUtils.interpolatePointOnCubicBezier)
     QgsGeometryUtils.segmentMidPoint = staticmethod(QgsGeometryUtils.segmentMidPoint)
     QgsGeometryUtils.segmentMidPointFromCenter = staticmethod(QgsGeometryUtils.segmentMidPointFromCenter)
     QgsGeometryUtils.circleTangentDirection = staticmethod(QgsGeometryUtils.circleTangentDirection)

diff --git a/python/PyQt6/core/auto_additions/qgsnurbscurve.py b/python/PyQt6/core/auto_additions/qgsnurbscurve.py
@@ -0,0 +1,6 @@
+# The following has been generated automatically from src/core/geometry/qgsnurbscurve.h
+try:
+    QgsNurbsCurve.__overridden_methods__ = ['clone', 'isClosed', 'isClosed2D', 'curveToLine', 'draw', 'drawAsPolygon', 'endPoint', 'equals', 'indexOf', 'interpolatePoint', 'numPoints', 'pointAt', 'points', 'reversed', 'scroll', 'startPoint', 'sumUpArea', 'xAt', 'yAt', 'zAt', 'mAt', 'asQPolygonF', 'addToPainterPath', 'curveSubstring', 'length', 'segmentLength', 'distanceBetweenVertices', 'snappedToGrid', 'simplifyByDistance', 'removeDuplicateNodes', 'vertexAngle', 'swapXy', 'transform', 'createEmptyWithSameType', 'closestSegment', 'boundingBox', 'boundingBox3D', 'moveVertex', 'insertVertex', 'wkbSize', 'asWkb', 'asWkt', 'asGml2', 'asGml3', 'asKml', 'dimension', 'isEmpty', 'clear', 'boundingBoxIntersects', 'centroid', 'addZValue', 'addMValue', 'dropZValue', 'dropMValue', 'deleteVertex', 'fromWkb', 'fromWkt', 'fuzzyEqual', 'fuzzyDistanceEqual', 'geometryType', 'hasCurvedSegments', 'partCount', 'toCurveType', 'vertexAt', 'vertexCount', 'vertexNumberFromVertexId', 'isValid', 'clearCache', 'compareToSameClass', 'calculateBoundingBox3D']
+    QgsNurbsCurve.__group__ = ['geometry']
+except (NameError, AttributeError):
+    pass
diff --git a/python/PyQt6/core/auto_additions/qgsnurbsutils.py b/python/PyQt6/core/auto_additions/qgsnurbsutils.py
@@ -0,0 +1,7 @@
+# The following has been generated automatically from src/core/geometry/qgsnurbsutils.h
+try:
+    QgsNurbsUtils.containsNurbsCurve = staticmethod(QgsNurbsUtils.containsNurbsCurve)
+    QgsNurbsUtils.findMutableNurbsCurveForVertex = staticmethod(QgsNurbsUtils.findMutableNurbsCurveForVertex)
+    QgsNurbsUtils.__group__ = ['geometry']
+except (NameError, AttributeError):
+    pass
diff --git a/python/PyQt6/core/auto_additions/qgspointlocator.py b/python/PyQt6/core/auto_additions/qgspointlocator.py
@@ -6,6 +6,7 @@
 QgsPointLocator.Centroid = QgsPointLocator.Type.Centroid
 QgsPointLocator.MiddleOfSegment = QgsPointLocator.Type.MiddleOfSegment
 QgsPointLocator.LineEndpoint = QgsPointLocator.Type.LineEndpoint
+QgsPointLocator.ControlPoint = QgsPointLocator.Type.ControlPoint
 QgsPointLocator.All = QgsPointLocator.Type.All
 QgsPointLocator.Types = lambda flags=0: QgsPointLocator.Type(flags)
 try:

diff --git a/python/PyQt6/core/auto_generated/geometry/qgsabstractgeometry.sip.in b/python/PyQt6/core/auto_generated/geometry/qgsabstractgeometry.sip.in
@@ -46,6 +46,8 @@ Abstract base class for all geometries.
       sipType = sipType_QgsCircularString;
     else if ( qgsgeometry_cast<QgsCompoundCurve *>( sipCpp ) != nullptr )
       sipType = sipType_QgsCompoundCurve;
+    else if ( qgsgeometry_cast<QgsNurbsCurve *>( sipCpp ) != nullptr )
+      sipType = sipType_QgsNurbsCurve;
     else if ( qgsgeometry_cast<QgsTriangle *>( sipCpp ) != nullptr )
       sipType = sipType_QgsTriangle;
     else if ( qgsgeometry_cast<QgsPolygon *>( sipCpp ) != nullptr )