[feature] Add "Linear Referencing" symbol layer type

This new symbol layer type allows placing text labels at regular
intervals along a line (or at positions corresponding to
existing vertices). Positions can be calculated using
Cartesian distances, or interpolated from z/m values.

Functionality includes:

- Labels can be placed using fixed cartesian 2d distances,
at regular linearly interpolated spacing calculated using
the Z or M values in geometries, or at existing vertices
- Labels can show either the running total distance, or
the linearly interpolated Z/M value
- Uses text rendered to draw labels, so the full range
of functionality is available for the labels (including
buffers, shadows, etc)
- Uses the QGIS numeric format classes to format numbers
as strings, so users have full range of customisation
options for eg decimal places
- An optional "skip multiples of" setting. If set, then
labels which are a multiple of this value will be skipped
over. This allows construction of complex referencing labels,
eg where a symbol has two linear referencing symbol layers,
one set to label every 100m in a small font, skipping multiples
of 1000, and a second set to label every 1000m in a big
bold font
- Labels are rendered using an angle calculated by averaging
the linestring, so sharp tiny jaggies don't result in
unslightly label rotation
- Optionally, markers can be placed at referenced points
in the line string, using a full QGIS marker symbol (this allows
eg showing a cross-hatch at the labeled point, for a "ruler"
style line)
- Data defined control over the placement intervals, skip
multiples setting, marker visibility and average angle
calculation length

Notes:

- When using the distance-based placement or labels, the
distances are calculated using 2D only, Cartesian calculations
based on the original layer CRS. This could potentially be
extended in future to expose options for 3D Cartesian distances,
or ellipsoidal distance calculations.

Sponsored by the Swiss QGIS User Group

CMakeLists.txt

@@ -1103,7 +1103,7 @@ if (WITH_CORE AND WITH_BINDINGS)
   include(SIPMacros)
 
   set(SIP_INCLUDES ${PYQT_SIP_DIR} ${CMAKE_SOURCE_DIR}/python)
-  set(SIP_CONCAT_PARTS 25)
+  set(SIP_CONCAT_PARTS 20)
 
   if (NOT BINDINGS_GLOBAL_INSTALL)
     set(Python_SITEARCH ${QGIS_DATA_DIR}/python)

python/PyQt6/core/auto_additions/qgis.py

@@ -2911,6 +2911,21 @@
 Qgis.MarkerLinePlacements = lambda flags=0: Qgis.MarkerLinePlacement(flags)
 Qgis.MarkerLinePlacements.baseClass = Qgis
 MarkerLinePlacements = Qgis  # dirty hack since SIP seems to introduce the flags in module
+# monkey patching scoped based enum
+Qgis.LinearReferencingPlacement.IntervalCartesian2D.__doc__ = "Place labels at regular intervals, using Cartesian distance calculations on a 2D plane"
+Qgis.LinearReferencingPlacement.IntervalZ.__doc__ = "Place labels at regular intervals, linearly interpolated using Z values"
+Qgis.LinearReferencingPlacement.IntervalM.__doc__ = "Place labels at regular intervals, linearly interpolated using M values"
+Qgis.LinearReferencingPlacement.Vertex.__doc__ = "Place labels on every vertex in the line"
+Qgis.LinearReferencingPlacement.__doc__ = "Defines how/where the labels should be placed in a linear referencing symbol layer.\n\n.. versionadded:: 3.40\n\n" + '* ``IntervalCartesian2D``: ' + Qgis.LinearReferencingPlacement.IntervalCartesian2D.__doc__ + '\n' + '* ``IntervalZ``: ' + Qgis.LinearReferencingPlacement.IntervalZ.__doc__ + '\n' + '* ``IntervalM``: ' + Qgis.LinearReferencingPlacement.IntervalM.__doc__ + '\n' + '* ``Vertex``: ' + Qgis.LinearReferencingPlacement.Vertex.__doc__
+# --
+Qgis.LinearReferencingPlacement.baseClass = Qgis
+# monkey patching scoped based enum
+Qgis.LinearReferencingLabelSource.CartesianDistance2D.__doc__ = "Distance along line, calculated using Cartesian calculations on a 2D plane."
+Qgis.LinearReferencingLabelSource.Z.__doc__ = "Z values"
+Qgis.LinearReferencingLabelSource.M.__doc__ = "M values"
+Qgis.LinearReferencingLabelSource.__doc__ = "Defines what quantity to use for the labels shown in a linear referencing symbol layer.\n\n.. versionadded:: 3.40\n\n" + '* ``CartesianDistance2D``: ' + Qgis.LinearReferencingLabelSource.CartesianDistance2D.__doc__ + '\n' + '* ``Z``: ' + Qgis.LinearReferencingLabelSource.Z.__doc__ + '\n' + '* ``M``: ' + Qgis.LinearReferencingLabelSource.M.__doc__
+# --
+Qgis.LinearReferencingLabelSource.baseClass = Qgis
 QgsGradientFillSymbolLayer.GradientColorType = Qgis.GradientColorSource
 # monkey patching scoped based enum
 QgsGradientFillSymbolLayer.SimpleTwoColor = Qgis.GradientColorSource.SimpleTwoColor

python/PyQt6/core/auto_additions/qgslinearreferencingsymbollayer.py

@@ -0,0 +1,6 @@
+# The following has been generated automatically from src/core/symbology/qgslinearreferencingsymbollayer.h
+QgsLinearReferencingSymbolLayer.create = staticmethod(QgsLinearReferencingSymbolLayer.create)
+try:
+    QgsLinearReferencingSymbolLayer.__group__ = ['symbology']
+except NameError:
+    pass

python/PyQt6/core/auto_additions/qgssymbollayer.py

@@ -280,7 +280,13 @@
 QgsSymbolLayer.Property.PropertyLineClipping = QgsSymbolLayer.Property.LineClipping
 QgsSymbolLayer.PropertyLineClipping.is_monkey_patched = True
 QgsSymbolLayer.PropertyLineClipping.__doc__ = "Line clipping mode (since QGIS 3.24)"
-QgsSymbolLayer.Property.__doc__ = "Data definable properties.\n\n" + '* ``PropertySize``: ' + QgsSymbolLayer.Property.Size.__doc__ + '\n' + '* ``PropertyAngle``: ' + QgsSymbolLayer.Property.Angle.__doc__ + '\n' + '* ``PropertyName``: ' + QgsSymbolLayer.Property.Name.__doc__ + '\n' + '* ``PropertyFillColor``: ' + QgsSymbolLayer.Property.FillColor.__doc__ + '\n' + '* ``PropertyStrokeColor``: ' + QgsSymbolLayer.Property.StrokeColor.__doc__ + '\n' + '* ``PropertyStrokeWidth``: ' + QgsSymbolLayer.Property.StrokeWidth.__doc__ + '\n' + '* ``PropertyStrokeStyle``: ' + QgsSymbolLayer.Property.StrokeStyle.__doc__ + '\n' + '* ``PropertyOffset``: ' + QgsSymbolLayer.Property.Offset.__doc__ + '\n' + '* ``PropertyCharacter``: ' + QgsSymbolLayer.Property.Character.__doc__ + '\n' + '* ``PropertyWidth``: ' + QgsSymbolLayer.Property.Width.__doc__ + '\n' + '* ``PropertyHeight``: ' + QgsSymbolLayer.Property.Height.__doc__ + '\n' + '* ``PropertyPreserveAspectRatio``: ' + QgsSymbolLayer.Property.PreserveAspectRatio.__doc__ + '\n' + '* ``PropertyFillStyle``: ' + QgsSymbolLayer.Property.FillStyle.__doc__ + '\n' + '* ``PropertyJoinStyle``: ' + QgsSymbolLayer.Property.JoinStyle.__doc__ + '\n' + '* ``PropertySecondaryColor``: ' + QgsSymbolLayer.Property.SecondaryColor.__doc__ + '\n' + '* ``PropertyLineAngle``: ' + QgsSymbolLayer.Property.LineAngle.__doc__ + '\n' + '* ``PropertyLineDistance``: ' + QgsSymbolLayer.Property.LineDistance.__doc__ + '\n' + '* ``PropertyGradientType``: ' + QgsSymbolLayer.Property.GradientType.__doc__ + '\n' + '* ``PropertyCoordinateMode``: ' + QgsSymbolLayer.Property.CoordinateMode.__doc__ + '\n' + '* ``PropertyGradientSpread``: ' + QgsSymbolLayer.Property.GradientSpread.__doc__ + '\n' + '* ``PropertyGradientReference1X``: ' + QgsSymbolLayer.Property.GradientReference1X.__doc__ + '\n' + '* ``PropertyGradientReference1Y``: ' + QgsSymbolLayer.Property.GradientReference1Y.__doc__ + '\n' + '* ``PropertyGradientReference2X``: ' + QgsSymbolLayer.Property.GradientReference2X.__doc__ + '\n' + '* ``PropertyGradientReference2Y``: ' + QgsSymbolLayer.Property.GradientReference2Y.__doc__ + '\n' + '* ``PropertyGradientReference1IsCentroid``: ' + QgsSymbolLayer.Property.GradientReference1IsCentroid.__doc__ + '\n' + '* ``PropertyGradientReference2IsCentroid``: ' + QgsSymbolLayer.Property.GradientReference2IsCentroid.__doc__ + '\n' + '* ``PropertyBlurRadius``: ' + QgsSymbolLayer.Property.BlurRadius.__doc__ + '\n' + '* ``PropertyShapeburstUseWholeShape``: ' + QgsSymbolLayer.Property.ShapeburstUseWholeShape.__doc__ + '\n' + '* ``PropertyShapeburstMaxDistance``: ' + QgsSymbolLayer.Property.ShapeburstMaxDistance.__doc__ + '\n' + '* ``PropertyShapeburstIgnoreRings``: ' + QgsSymbolLayer.Property.ShapeburstIgnoreRings.__doc__ + '\n' + '* ``PropertyFile``: ' + QgsSymbolLayer.Property.File.__doc__ + '\n' + '* ``PropertyDistanceX``: ' + QgsSymbolLayer.Property.DistanceX.__doc__ + '\n' + '* ``PropertyDistanceY``: ' + QgsSymbolLayer.Property.DistanceY.__doc__ + '\n' + '* ``PropertyDisplacementX``: ' + QgsSymbolLayer.Property.DisplacementX.__doc__ + '\n' + '* ``PropertyDisplacementY``: ' + QgsSymbolLayer.Property.DisplacementY.__doc__ + '\n' + '* ``PropertyOpacity``: ' + QgsSymbolLayer.Property.Opacity.__doc__ + '\n' + '* ``PropertyCustomDash``: ' + QgsSymbolLayer.Property.CustomDash.__doc__ + '\n' + '* ``PropertyCapStyle``: ' + QgsSymbolLayer.Property.CapStyle.__doc__ + '\n' + '* ``PropertyPlacement``: ' + QgsSymbolLayer.Property.Placement.__doc__ + '\n' + '* ``PropertyInterval``: ' + QgsSymbolLayer.Property.Interval.__doc__ + '\n' + '* ``PropertyOffsetAlongLine``: ' + QgsSymbolLayer.Property.OffsetAlongLine.__doc__ + '\n' + '* ``PropertyAverageAngleLength``: ' + QgsSymbolLayer.Property.AverageAngleLength.__doc__ + '\n' + '* ``PropertyHorizontalAnchor``: ' + QgsSymbolLayer.Property.HorizontalAnchor.__doc__ + '\n' + '* ``PropertyVerticalAnchor``: ' + QgsSymbolLayer.Property.VerticalAnchor.__doc__ + '\n' + '* ``PropertyLayerEnabled``: ' + QgsSymbolLayer.Property.LayerEnabled.__doc__ + '\n' + '* ``PropertyArrowWidth``: ' + QgsSymbolLayer.Property.ArrowWidth.__doc__ + '\n' + '* ``PropertyArrowStartWidth``: ' + QgsSymbolLayer.Property.ArrowStartWidth.__doc__ + '\n' + '* ``PropertyArrowHeadLength``: ' + QgsSymbolLayer.Property.ArrowHeadLength.__doc__ + '\n' + '* ``PropertyArrowHeadThickness``: ' + QgsSymbolLayer.Property.ArrowHeadThickness.__doc__ + '\n' + '* ``PropertyArrowHeadType``: ' + QgsSymbolLayer.Property.ArrowHeadType.__doc__ + '\n' + '* ``PropertyArrowType``: ' + QgsSymbolLayer.Property.ArrowType.__doc__ + '\n' + '* ``PropertyOffsetX``: ' + QgsSymbolLayer.Property.OffsetX.__doc__ + '\n' + '* ``PropertyOffsetY``: ' + QgsSymbolLayer.Property.OffsetY.__doc__ + '\n' + '* ``PropertyPointCount``: ' + QgsSymbolLayer.Property.PointCount.__doc__ + '\n' + '* ``PropertyRandomSeed``: ' + QgsSymbolLayer.Property.RandomSeed.__doc__ + '\n' + '* ``PropertyClipPoints``: ' + QgsSymbolLayer.Property.ClipPoints.__doc__ + '\n' + '* ``PropertyDensityArea``: ' + QgsSymbolLayer.Property.DensityArea.__doc__ + '\n' + '* ``PropertyFontFamily``: ' + QgsSymbolLayer.Property.FontFamily.__doc__ + '\n' + '* ``PropertyFontStyle``: ' + QgsSymbolLayer.Property.FontStyle.__doc__ + '\n' + '* ``PropertyDashPatternOffset``: ' + QgsSymbolLayer.Property.DashPatternOffset.__doc__ + '\n' + '* ``PropertyTrimStart``: ' + QgsSymbolLayer.Property.TrimStart.__doc__ + '\n' + '* ``PropertyTrimEnd``: ' + QgsSymbolLayer.Property.TrimEnd.__doc__ + '\n' + '* ``PropertyLineStartWidthValue``: ' + QgsSymbolLayer.Property.LineStartWidthValue.__doc__ + '\n' + '* ``PropertyLineEndWidthValue``: ' + QgsSymbolLayer.Property.LineEndWidthValue.__doc__ + '\n' + '* ``PropertyLineStartColorValue``: ' + QgsSymbolLayer.Property.LineStartColorValue.__doc__ + '\n' + '* ``PropertyLineEndColorValue``: ' + QgsSymbolLayer.Property.LineEndColorValue.__doc__ + '\n' + '* ``PropertyMarkerClipping``: ' + QgsSymbolLayer.Property.MarkerClipping.__doc__ + '\n' + '* ``PropertyRandomOffsetX``: ' + QgsSymbolLayer.Property.RandomOffsetX.__doc__ + '\n' + '* ``PropertyRandomOffsetY``: ' + QgsSymbolLayer.Property.RandomOffsetY.__doc__ + '\n' + '* ``PropertyLineClipping``: ' + QgsSymbolLayer.Property.LineClipping.__doc__
+QgsSymbolLayer.SkipMultiples = QgsSymbolLayer.Property.SkipMultiples
+QgsSymbolLayer.SkipMultiples.is_monkey_patched = True
+QgsSymbolLayer.SkipMultiples.__doc__ = "Skip multiples of (since QGIS 3.40)"
+QgsSymbolLayer.ShowMarker = QgsSymbolLayer.Property.ShowMarker
+QgsSymbolLayer.ShowMarker.is_monkey_patched = True
+QgsSymbolLayer.ShowMarker.__doc__ = "Show markers (since QGIS 3.40)"
+QgsSymbolLayer.Property.__doc__ = "Data definable properties.\n\n" + '* ``PropertySize``: ' + QgsSymbolLayer.Property.Size.__doc__ + '\n' + '* ``PropertyAngle``: ' + QgsSymbolLayer.Property.Angle.__doc__ + '\n' + '* ``PropertyName``: ' + QgsSymbolLayer.Property.Name.__doc__ + '\n' + '* ``PropertyFillColor``: ' + QgsSymbolLayer.Property.FillColor.__doc__ + '\n' + '* ``PropertyStrokeColor``: ' + QgsSymbolLayer.Property.StrokeColor.__doc__ + '\n' + '* ``PropertyStrokeWidth``: ' + QgsSymbolLayer.Property.StrokeWidth.__doc__ + '\n' + '* ``PropertyStrokeStyle``: ' + QgsSymbolLayer.Property.StrokeStyle.__doc__ + '\n' + '* ``PropertyOffset``: ' + QgsSymbolLayer.Property.Offset.__doc__ + '\n' + '* ``PropertyCharacter``: ' + QgsSymbolLayer.Property.Character.__doc__ + '\n' + '* ``PropertyWidth``: ' + QgsSymbolLayer.Property.Width.__doc__ + '\n' + '* ``PropertyHeight``: ' + QgsSymbolLayer.Property.Height.__doc__ + '\n' + '* ``PropertyPreserveAspectRatio``: ' + QgsSymbolLayer.Property.PreserveAspectRatio.__doc__ + '\n' + '* ``PropertyFillStyle``: ' + QgsSymbolLayer.Property.FillStyle.__doc__ + '\n' + '* ``PropertyJoinStyle``: ' + QgsSymbolLayer.Property.JoinStyle.__doc__ + '\n' + '* ``PropertySecondaryColor``: ' + QgsSymbolLayer.Property.SecondaryColor.__doc__ + '\n' + '* ``PropertyLineAngle``: ' + QgsSymbolLayer.Property.LineAngle.__doc__ + '\n' + '* ``PropertyLineDistance``: ' + QgsSymbolLayer.Property.LineDistance.__doc__ + '\n' + '* ``PropertyGradientType``: ' + QgsSymbolLayer.Property.GradientType.__doc__ + '\n' + '* ``PropertyCoordinateMode``: ' + QgsSymbolLayer.Property.CoordinateMode.__doc__ + '\n' + '* ``PropertyGradientSpread``: ' + QgsSymbolLayer.Property.GradientSpread.__doc__ + '\n' + '* ``PropertyGradientReference1X``: ' + QgsSymbolLayer.Property.GradientReference1X.__doc__ + '\n' + '* ``PropertyGradientReference1Y``: ' + QgsSymbolLayer.Property.GradientReference1Y.__doc__ + '\n' + '* ``PropertyGradientReference2X``: ' + QgsSymbolLayer.Property.GradientReference2X.__doc__ + '\n' + '* ``PropertyGradientReference2Y``: ' + QgsSymbolLayer.Property.GradientReference2Y.__doc__ + '\n' + '* ``PropertyGradientReference1IsCentroid``: ' + QgsSymbolLayer.Property.GradientReference1IsCentroid.__doc__ + '\n' + '* ``PropertyGradientReference2IsCentroid``: ' + QgsSymbolLayer.Property.GradientReference2IsCentroid.__doc__ + '\n' + '* ``PropertyBlurRadius``: ' + QgsSymbolLayer.Property.BlurRadius.__doc__ + '\n' + '* ``PropertyShapeburstUseWholeShape``: ' + QgsSymbolLayer.Property.ShapeburstUseWholeShape.__doc__ + '\n' + '* ``PropertyShapeburstMaxDistance``: ' + QgsSymbolLayer.Property.ShapeburstMaxDistance.__doc__ + '\n' + '* ``PropertyShapeburstIgnoreRings``: ' + QgsSymbolLayer.Property.ShapeburstIgnoreRings.__doc__ + '\n' + '* ``PropertyFile``: ' + QgsSymbolLayer.Property.File.__doc__ + '\n' + '* ``PropertyDistanceX``: ' + QgsSymbolLayer.Property.DistanceX.__doc__ + '\n' + '* ``PropertyDistanceY``: ' + QgsSymbolLayer.Property.DistanceY.__doc__ + '\n' + '* ``PropertyDisplacementX``: ' + QgsSymbolLayer.Property.DisplacementX.__doc__ + '\n' + '* ``PropertyDisplacementY``: ' + QgsSymbolLayer.Property.DisplacementY.__doc__ + '\n' + '* ``PropertyOpacity``: ' + QgsSymbolLayer.Property.Opacity.__doc__ + '\n' + '* ``PropertyCustomDash``: ' + QgsSymbolLayer.Property.CustomDash.__doc__ + '\n' + '* ``PropertyCapStyle``: ' + QgsSymbolLayer.Property.CapStyle.__doc__ + '\n' + '* ``PropertyPlacement``: ' + QgsSymbolLayer.Property.Placement.__doc__ + '\n' + '* ``PropertyInterval``: ' + QgsSymbolLayer.Property.Interval.__doc__ + '\n' + '* ``PropertyOffsetAlongLine``: ' + QgsSymbolLayer.Property.OffsetAlongLine.__doc__ + '\n' + '* ``PropertyAverageAngleLength``: ' + QgsSymbolLayer.Property.AverageAngleLength.__doc__ + '\n' + '* ``PropertyHorizontalAnchor``: ' + QgsSymbolLayer.Property.HorizontalAnchor.__doc__ + '\n' + '* ``PropertyVerticalAnchor``: ' + QgsSymbolLayer.Property.VerticalAnchor.__doc__ + '\n' + '* ``PropertyLayerEnabled``: ' + QgsSymbolLayer.Property.LayerEnabled.__doc__ + '\n' + '* ``PropertyArrowWidth``: ' + QgsSymbolLayer.Property.ArrowWidth.__doc__ + '\n' + '* ``PropertyArrowStartWidth``: ' + QgsSymbolLayer.Property.ArrowStartWidth.__doc__ + '\n' + '* ``PropertyArrowHeadLength``: ' + QgsSymbolLayer.Property.ArrowHeadLength.__doc__ + '\n' + '* ``PropertyArrowHeadThickness``: ' + QgsSymbolLayer.Property.ArrowHeadThickness.__doc__ + '\n' + '* ``PropertyArrowHeadType``: ' + QgsSymbolLayer.Property.ArrowHeadType.__doc__ + '\n' + '* ``PropertyArrowType``: ' + QgsSymbolLayer.Property.ArrowType.__doc__ + '\n' + '* ``PropertyOffsetX``: ' + QgsSymbolLayer.Property.OffsetX.__doc__ + '\n' + '* ``PropertyOffsetY``: ' + QgsSymbolLayer.Property.OffsetY.__doc__ + '\n' + '* ``PropertyPointCount``: ' + QgsSymbolLayer.Property.PointCount.__doc__ + '\n' + '* ``PropertyRandomSeed``: ' + QgsSymbolLayer.Property.RandomSeed.__doc__ + '\n' + '* ``PropertyClipPoints``: ' + QgsSymbolLayer.Property.ClipPoints.__doc__ + '\n' + '* ``PropertyDensityArea``: ' + QgsSymbolLayer.Property.DensityArea.__doc__ + '\n' + '* ``PropertyFontFamily``: ' + QgsSymbolLayer.Property.FontFamily.__doc__ + '\n' + '* ``PropertyFontStyle``: ' + QgsSymbolLayer.Property.FontStyle.__doc__ + '\n' + '* ``PropertyDashPatternOffset``: ' + QgsSymbolLayer.Property.DashPatternOffset.__doc__ + '\n' + '* ``PropertyTrimStart``: ' + QgsSymbolLayer.Property.TrimStart.__doc__ + '\n' + '* ``PropertyTrimEnd``: ' + QgsSymbolLayer.Property.TrimEnd.__doc__ + '\n' + '* ``PropertyLineStartWidthValue``: ' + QgsSymbolLayer.Property.LineStartWidthValue.__doc__ + '\n' + '* ``PropertyLineEndWidthValue``: ' + QgsSymbolLayer.Property.LineEndWidthValue.__doc__ + '\n' + '* ``PropertyLineStartColorValue``: ' + QgsSymbolLayer.Property.LineStartColorValue.__doc__ + '\n' + '* ``PropertyLineEndColorValue``: ' + QgsSymbolLayer.Property.LineEndColorValue.__doc__ + '\n' + '* ``PropertyMarkerClipping``: ' + QgsSymbolLayer.Property.MarkerClipping.__doc__ + '\n' + '* ``PropertyRandomOffsetX``: ' + QgsSymbolLayer.Property.RandomOffsetX.__doc__ + '\n' + '* ``PropertyRandomOffsetY``: ' + QgsSymbolLayer.Property.RandomOffsetY.__doc__ + '\n' + '* ``PropertyLineClipping``: ' + QgsSymbolLayer.Property.LineClipping.__doc__ + '\n' + '* ``SkipMultiples``: ' + QgsSymbolLayer.Property.SkipMultiples.__doc__ + '\n' + '* ``ShowMarker``: ' + QgsSymbolLayer.Property.ShowMarker.__doc__
 # --
 QgsMarkerSymbolLayer.Left = QgsMarkerSymbolLayer.HorizontalAnchorPoint.Left
 QgsMarkerSymbolLayer.HCenter = QgsMarkerSymbolLayer.HorizontalAnchorPoint.HCenter

python/PyQt6/core/auto_generated/qgis.sip.in

@@ -1628,6 +1628,21 @@ The development version
     typedef QFlags<Qgis::MarkerLinePlacement> MarkerLinePlacements;
 
 
+    enum class LinearReferencingPlacement /BaseType=IntFlag/
+    {
+      IntervalCartesian2D,
+      IntervalZ,
+      IntervalM,
+      Vertex,
+    };
+
+    enum class LinearReferencingLabelSource /BaseType=IntEnum/
+    {
+      CartesianDistance2D,
+      Z,
+      M,
+    };
+
     enum class GradientColorSource /BaseType=IntEnum/
       {
       SimpleTwoColor,