Add support for Wind Barb rendering for mesh vector datasets

python/PyQt6/core/auto_additions/qgsmeshrenderersettings.py

@@ -6,6 +6,16 @@ QgsMeshRendererVectorArrowSettings.Scaled = QgsMeshRendererVectorArrowSettings.A
 QgsMeshRendererVectorArrowSettings.Fixed = QgsMeshRendererVectorArrowSettings.ArrowScalingMethod.Fixed
 QgsMeshRendererVectorStreamlineSettings.MeshGridded = QgsMeshRendererVectorStreamlineSettings.SeedingStartPointsMethod.MeshGridded
 QgsMeshRendererVectorStreamlineSettings.Random = QgsMeshRendererVectorStreamlineSettings.SeedingStartPointsMethod.Random
+# monkey patching scoped based enum
+QgsMeshRendererVectorWindBarbSettings.WindSpeedUnit.MetersPerSecond.__doc__ = "Meters per second"
+QgsMeshRendererVectorWindBarbSettings.WindSpeedUnit.KilometersPerHour.__doc__ = "Kilometers per hour"
+QgsMeshRendererVectorWindBarbSettings.WindSpeedUnit.Knots.__doc__ = "Knots (Nautical miles per hour)"
+QgsMeshRendererVectorWindBarbSettings.WindSpeedUnit.MilesPerHour.__doc__ = "Miles per hour"
+QgsMeshRendererVectorWindBarbSettings.WindSpeedUnit.FeetPerSecond.__doc__ = "Feet per second"
+QgsMeshRendererVectorWindBarbSettings.WindSpeedUnit.OtherUnit.__doc__ = "Other unit"
+QgsMeshRendererVectorWindBarbSettings.WindSpeedUnit.__doc__ = "Wind speed units. Wind barbs use knots so we use this enum for preset conversion values\n\n" + '* ``MetersPerSecond``: ' + QgsMeshRendererVectorWindBarbSettings.WindSpeedUnit.MetersPerSecond.__doc__ + '\n' + '* ``KilometersPerHour``: ' + QgsMeshRendererVectorWindBarbSettings.WindSpeedUnit.KilometersPerHour.__doc__ + '\n' + '* ``Knots``: ' + QgsMeshRendererVectorWindBarbSettings.WindSpeedUnit.Knots.__doc__ + '\n' + '* ``MilesPerHour``: ' + QgsMeshRendererVectorWindBarbSettings.WindSpeedUnit.MilesPerHour.__doc__ + '\n' + '* ``FeetPerSecond``: ' + QgsMeshRendererVectorWindBarbSettings.WindSpeedUnit.FeetPerSecond.__doc__ + '\n' + '* ``OtherUnit``: ' + QgsMeshRendererVectorWindBarbSettings.WindSpeedUnit.OtherUnit.__doc__
+# --
 QgsMeshRendererVectorSettings.Arrows = QgsMeshRendererVectorSettings.Symbology.Arrows
 QgsMeshRendererVectorSettings.Streamlines = QgsMeshRendererVectorSettings.Symbology.Streamlines
 QgsMeshRendererVectorSettings.Traces = QgsMeshRendererVectorSettings.Symbology.Traces
+QgsMeshRendererVectorSettings.WindBarbs = QgsMeshRendererVectorSettings.Symbology.WindBarbs

python/PyQt6/core/auto_generated/mesh/qgsmeshrenderersettings.sip.in

@@ -419,6 +419,84 @@ Writes configuration to a new DOM element
 
 };
 
+class QgsMeshRendererVectorWindBarbSettings
+{
+%Docstring(signature="appended")
+
+Represents a mesh renderer settings for vector datasets displayed with wind barbs
+
+.. note::
+
+   The API is considered EXPERIMENTAL and can be changed without a notice
+
+.. versionadded:: 3.38
+%End
+
+%TypeHeaderCode
+#include "qgsmeshrenderersettings.h"
+%End
+  public:
+    enum class WindSpeedUnit
+    {
+      MetersPerSecond,
+      KilometersPerHour,
+      Knots,
+      MilesPerHour,
+      FeetPerSecond,
+      OtherUnit
+    };
+
+    double magnitudeMultiplier() const;
+%Docstring
+Returns the multiplier for the magnitude to convert it to knots
+%End
+
+    void setMagnitudeMultiplier( double magnitudeMultiplier );
+%Docstring
+Sets a multiplier for the magnitude to convert it to knots
+%End
+
+    double shaftLength() const;
+%Docstring
+Returns the shaft length (in millimeters)
+%End
+
+    void setShaftLength( double shaftLength );
+%Docstring
+Sets the shaft length  (in millimeters)
+%End
+
+    Qgis::RenderUnit shaftLengthUnits();
+%Docstring
+Sets the units for the shaft length
+%End
+
+    void setShaftLengthUnits( Qgis::RenderUnit shaftLengthUnit );
+%Docstring
+Returns the units for the shaft length
+%End
+
+    WindSpeedUnit magnitudeUnits() const;
+%Docstring
+Returns the units that the data are in
+%End
+
+    void setMagnitudeUnits( WindSpeedUnit units );
+%Docstring
+Sets the units that the data are in
+%End
+
+    QDomElement writeXml( QDomDocument &doc ) const;
+%Docstring
+Writes configuration to a new DOM element
+%End
+    void readXml( const QDomElement &elem );
+%Docstring
+Reads configuration from the given DOM element
+%End
+
+};
+
 class QgsMeshRendererVectorSettings
 {
 %Docstring(signature="appended")
@@ -444,7 +522,9 @@ Represents a renderer settings for vector datasets
       //! Displaying vector dataset with streamlines
       Streamlines,
       //! Displaying vector dataset with particle traces
-      Traces
+      Traces,
+      //! Displaying vector dataset with wind barbs
+      WindBarbs
     };
 
     double lineWidth() const;
@@ -609,6 +689,20 @@ Returns settings for vector rendered with traces
 Sets settings for vector rendered with traces
 
 .. versionadded:: 3.12
+%End
+
+    QgsMeshRendererVectorWindBarbSettings windBarbSettings() const;
+%Docstring
+Returns settings for vector rendered with wind barbs
+
+.. versionadded:: 3.38
+%End
+
+    void setWindBarbSettings( const QgsMeshRendererVectorWindBarbSettings &windBarbSettings );
+%Docstring
+Sets settings for vector rendered with wind barbs
+
+.. versionadded:: 3.38
 %End
 
     QDomElement writeXml( QDomDocument &doc, const QgsReadWriteContext &context = QgsReadWriteContext() ) const;

python/core/auto_additions/qgsmeshrenderersettings.py

@@ -0,0 +1,10 @@
+# The following has been generated automatically from src/core/mesh/qgsmeshrenderersettings.h
+# monkey patching scoped based enum
+QgsMeshRendererVectorWindBarbSettings.WindSpeedUnit.MetersPerSecond.__doc__ = "Meters per second"
+QgsMeshRendererVectorWindBarbSettings.WindSpeedUnit.KilometersPerHour.__doc__ = "Kilometers per hour"
+QgsMeshRendererVectorWindBarbSettings.WindSpeedUnit.Knots.__doc__ = "Knots (Nautical miles per hour)"
+QgsMeshRendererVectorWindBarbSettings.WindSpeedUnit.MilesPerHour.__doc__ = "Miles per hour"
+QgsMeshRendererVectorWindBarbSettings.WindSpeedUnit.FeetPerSecond.__doc__ = "Feet per second"
+QgsMeshRendererVectorWindBarbSettings.WindSpeedUnit.OtherUnit.__doc__ = "Other unit"
+QgsMeshRendererVectorWindBarbSettings.WindSpeedUnit.__doc__ = "Wind speed units. Wind barbs use knots so we use this enum for preset conversion values\n\n" + '* ``MetersPerSecond``: ' + QgsMeshRendererVectorWindBarbSettings.WindSpeedUnit.MetersPerSecond.__doc__ + '\n' + '* ``KilometersPerHour``: ' + QgsMeshRendererVectorWindBarbSettings.WindSpeedUnit.KilometersPerHour.__doc__ + '\n' + '* ``Knots``: ' + QgsMeshRendererVectorWindBarbSettings.WindSpeedUnit.Knots.__doc__ + '\n' + '* ``MilesPerHour``: ' + QgsMeshRendererVectorWindBarbSettings.WindSpeedUnit.MilesPerHour.__doc__ + '\n' + '* ``FeetPerSecond``: ' + QgsMeshRendererVectorWindBarbSettings.WindSpeedUnit.FeetPerSecond.__doc__ + '\n' + '* ``OtherUnit``: ' + QgsMeshRendererVectorWindBarbSettings.WindSpeedUnit.OtherUnit.__doc__
+# --

python/core/auto_generated/mesh/qgsmeshrenderersettings.sip.in

@@ -419,6 +419,84 @@ Writes configuration to a new DOM element
 
 };
 
+class QgsMeshRendererVectorWindBarbSettings
+{
+%Docstring(signature="appended")
+
+Represents a mesh renderer settings for vector datasets displayed with wind barbs
+
+.. note::
+
+   The API is considered EXPERIMENTAL and can be changed without a notice
+
+.. versionadded:: 3.38
+%End
+
+%TypeHeaderCode
+#include "qgsmeshrenderersettings.h"
+%End
+  public:
+    enum class WindSpeedUnit
+    {
+      MetersPerSecond,
+      KilometersPerHour,
+      Knots,
+      MilesPerHour,
+      FeetPerSecond,
+      OtherUnit
+    };
+
+    double magnitudeMultiplier() const;
+%Docstring
+Returns the multiplier for the magnitude to convert it to knots
+%End
+
+    void setMagnitudeMultiplier( double magnitudeMultiplier );
+%Docstring
+Sets a multiplier for the magnitude to convert it to knots
+%End
+
+    double shaftLength() const;
+%Docstring
+Returns the shaft length (in millimeters)
+%End
+
+    void setShaftLength( double shaftLength );
+%Docstring
+Sets the shaft length  (in millimeters)
+%End
+
+    Qgis::RenderUnit shaftLengthUnits();
+%Docstring
+Sets the units for the shaft length
+%End
+
+    void setShaftLengthUnits( Qgis::RenderUnit shaftLengthUnit );
+%Docstring
+Returns the units for the shaft length
+%End
+
+    WindSpeedUnit magnitudeUnits() const;
+%Docstring
+Returns the units that the data are in
+%End
+
+    void setMagnitudeUnits( WindSpeedUnit units );
+%Docstring
+Sets the units that the data are in
+%End
+
+    QDomElement writeXml( QDomDocument &doc ) const;
+%Docstring
+Writes configuration to a new DOM element
+%End
+    void readXml( const QDomElement &elem );
+%Docstring
+Reads configuration from the given DOM element
+%End
+
+};
+
 class QgsMeshRendererVectorSettings
 {
 %Docstring(signature="appended")
@@ -444,7 +522,9 @@ Represents a renderer settings for vector datasets
       //! Displaying vector dataset with streamlines
       Streamlines,
       //! Displaying vector dataset with particle traces
-      Traces
+      Traces,
+      //! Displaying vector dataset with wind barbs
+      WindBarbs
     };
 
     double lineWidth() const;
@@ -609,6 +689,20 @@ Returns settings for vector rendered with traces
 Sets settings for vector rendered with traces
 
 .. versionadded:: 3.12
+%End
+
+    QgsMeshRendererVectorWindBarbSettings windBarbSettings() const;
+%Docstring
+Returns settings for vector rendered with wind barbs
+
+.. versionadded:: 3.38
+%End
+
+    void setWindBarbSettings( const QgsMeshRendererVectorWindBarbSettings &windBarbSettings );
+%Docstring
+Sets settings for vector rendered with wind barbs
+
+.. versionadded:: 3.38
 %End
 
     QDomElement writeXml( QDomDocument &doc, const QgsReadWriteContext &context = QgsReadWriteContext() ) const;

src/core/mesh/qgsmeshrenderersettings.cpp

@@ -612,6 +612,7 @@ QDomElement QgsMeshRendererVectorSettings::writeXml( QDomDocument &doc, const Qg
   elem.appendChild( mArrowsSettings.writeXml( doc ) );
   elem.appendChild( mStreamLinesSettings.writeXml( doc ) );
   elem.appendChild( mTracesSettings.writeXml( doc ) );
+  elem.appendChild( mWindBarbSettings.writeXml( doc ) );
 
   return elem;
 }
@@ -644,6 +645,10 @@ void QgsMeshRendererVectorSettings::readXml( const QDomElement &elem, const QgsR
   const QDomElement elemTraces = elem.firstChildElement( QStringLiteral( "vector-traces-settings" ) );
   if ( ! elemTraces.isNull() )
     mTracesSettings.readXml( elemTraces );
+
+  const QDomElement elemWindBarb = elem.firstChildElement( QStringLiteral( "vector-windbarb-settings" ) );
+  if ( ! elemWindBarb.isNull() )
+    mWindBarbSettings.readXml( elemWindBarb );
 }
 
 QgsInterpolatedLineColor::ColoringMethod QgsMeshRendererVectorSettings::coloringMethod() const
@@ -744,3 +749,73 @@ bool QgsMeshRendererSettings::hasSettings( int datasetGroupIndex ) const
 {
   return mRendererScalarSettings.contains( datasetGroupIndex ) || mRendererVectorSettings.contains( datasetGroupIndex );
 }
+
+QgsMeshRendererVectorWindBarbSettings QgsMeshRendererVectorSettings::windBarbSettings() const
+{
+  return mWindBarbSettings;
+}
+
+void QgsMeshRendererVectorSettings::setWindBarbSettings( const QgsMeshRendererVectorWindBarbSettings &windBarbSettings )
+{
+  mWindBarbSettings = windBarbSettings;
+}
+
+void QgsMeshRendererVectorWindBarbSettings::readXml( const QDomElement &elem )
+{
+  mShaftLength = elem.attribute( QStringLiteral( "shaft-length" ), QStringLiteral( "10" ) ).toDouble();
+  mShaftLengthUnits = static_cast<Qgis::RenderUnit>(
+                        elem.attribute( QStringLiteral( "shaft-length-units" ) ).toInt() );
+  mMagnitudeMultiplier = elem.attribute( QStringLiteral( "magnitude-multiplier" ), QStringLiteral( "1" ) ).toDouble();
+  mMagnitudeUnits = static_cast<WindSpeedUnit>(
+                      elem.attribute( QStringLiteral( "magnitude-units" ), QStringLiteral( "0" ) ).toInt() );
+}
+
+QDomElement QgsMeshRendererVectorWindBarbSettings::writeXml( QDomDocument &doc ) const
+{
+  QDomElement elem = doc.createElement( QStringLiteral( "vector-windbarb-settings" ) );
+  elem.setAttribute( QStringLiteral( "shaft-length" ), mShaftLength );
+  elem.setAttribute( QStringLiteral( "shaft-length-units" ), static_cast< int >( mShaftLengthUnits ) );
+  elem.setAttribute( QStringLiteral( "magnitude-multiplier" ), mMagnitudeMultiplier );
+  elem.setAttribute( QStringLiteral( "magnitude-units" ), static_cast< int >( mMagnitudeUnits ) );
+  return elem;
+}
+
+double QgsMeshRendererVectorWindBarbSettings::magnitudeMultiplier() const
+{
+  return mMagnitudeMultiplier;
+}
+
+void QgsMeshRendererVectorWindBarbSettings::setMagnitudeMultiplier( double magnitudeMultiplier )
+{
+  mMagnitudeMultiplier = magnitudeMultiplier;
+}
+
+double QgsMeshRendererVectorWindBarbSettings::shaftLength() const
+{
+  return mShaftLength;
+}
+
+void QgsMeshRendererVectorWindBarbSettings::setShaftLength( double shaftLength )
+{
+  mShaftLength = shaftLength;
+}
+
+Qgis::RenderUnit QgsMeshRendererVectorWindBarbSettings::shaftLengthUnits()
+{
+  return mShaftLengthUnits;
+}
+
+void QgsMeshRendererVectorWindBarbSettings::setShaftLengthUnits( Qgis::RenderUnit shaftLengthUnit )
+{
+  mShaftLengthUnits = shaftLengthUnit;
+}
+
+QgsMeshRendererVectorWindBarbSettings::WindSpeedUnit QgsMeshRendererVectorWindBarbSettings::magnitudeUnits() const
+{
+  return mMagnitudeUnits;
+}
+
+void QgsMeshRendererVectorWindBarbSettings::setMagnitudeUnits( WindSpeedUnit units )
+{
+  mMagnitudeUnits = units;
+}

src/core/mesh/qgsmeshrenderersettings.h

@@ -395,6 +395,81 @@ class CORE_EXPORT QgsMeshRendererVectorTracesSettings
 
 };
 
+/**
+ * \ingroup core
+ *
+ * \brief Represents a mesh renderer settings for vector datasets displayed with wind barbs
+ *
+ * \note The API is considered EXPERIMENTAL and can be changed without a notice
+ *
+ * \since QGIS 3.38
+ */
+class CORE_EXPORT QgsMeshRendererVectorWindBarbSettings
+{
+  public:
+    //! Wind speed units. Wind barbs use knots so we use this enum for preset conversion values
+    enum class WindSpeedUnit
+    {
+      MetersPerSecond = 0, //!< Meters per second
+      KilometersPerHour, //!< Kilometers per hour
+      Knots, //!< Knots (Nautical miles per hour)
+      MilesPerHour, //!< Miles per hour
+      FeetPerSecond, //!< Feet per second
+      OtherUnit //!< Other unit
+    };
+
+    /**
+     * Returns the multiplier for the magnitude to convert it to knots
+     */
+    double magnitudeMultiplier() const;
+
+    /**
+     * Sets a multiplier for the magnitude to convert it to knots
+     */
+    void setMagnitudeMultiplier( double magnitudeMultiplier );
+
+    /**
+     * Returns the shaft length (in millimeters)
+     */
+    double shaftLength() const;
+
+    /**
+     * Sets the shaft length  (in millimeters)
+     */
+    void setShaftLength( double shaftLength );
+
+    /**
+     * Sets the units for the shaft length
+     */
+    Qgis::RenderUnit shaftLengthUnits();
+
+    /**
+     * Returns the units for the shaft length
+     */
+    void setShaftLengthUnits( Qgis::RenderUnit shaftLengthUnit );
+
+    /**
+     * Returns the units that the data are in
+     */
+    WindSpeedUnit magnitudeUnits() const;
+
+    /**
+     * Sets the units that the data are in
+     */
+    void setMagnitudeUnits( WindSpeedUnit units );
+
+    //! Writes configuration to a new DOM element
+    QDomElement writeXml( QDomDocument &doc ) const;
+    //! Reads configuration from the given DOM element
+    void readXml( const QDomElement &elem );
+
+  private:
+    double mShaftLength = 10;
+    Qgis::RenderUnit mShaftLengthUnits = Qgis::RenderUnit::Millimeters;
+    WindSpeedUnit mMagnitudeUnits = WindSpeedUnit::MetersPerSecond;
+    double mMagnitudeMultiplier = 1;
+};
+
 /**
  * \ingroup core
  *
@@ -419,7 +494,9 @@ class CORE_EXPORT QgsMeshRendererVectorSettings
       //! Displaying vector dataset with streamlines
       Streamlines,
       //! Displaying vector dataset with particle traces
-      Traces
+      Traces,
+      //! Displaying vector dataset with wind barbs
+      WindBarbs
     };
 
     //! Returns line width of the arrow (in millimeters)
@@ -551,6 +628,18 @@ class CORE_EXPORT QgsMeshRendererVectorSettings
      */
     void setTracesSettings( const QgsMeshRendererVectorTracesSettings &tracesSettings );
 
+    /**
+    * Returns settings for vector rendered with wind barbs
+    * \since QGIS 3.38
+    */
+    QgsMeshRendererVectorWindBarbSettings windBarbSettings() const;
+
+    /**
+     * Sets settings for vector rendered with wind barbs
+     * \since QGIS 3.38
+     */
+    void setWindBarbSettings( const QgsMeshRendererVectorWindBarbSettings &windBarbSettings );
+
     //! Writes configuration to a new DOM element
     QDomElement writeXml( QDomDocument &doc, const QgsReadWriteContext &context = QgsReadWriteContext() ) const;
     //! Reads configuration from the given DOM element
@@ -573,6 +662,7 @@ class CORE_EXPORT QgsMeshRendererVectorSettings
     QgsMeshRendererVectorArrowSettings mArrowsSettings;
     QgsMeshRendererVectorStreamlineSettings mStreamLinesSettings;
     QgsMeshRendererVectorTracesSettings mTracesSettings;
+    QgsMeshRendererVectorWindBarbSettings mWindBarbSettings;
 };
 
 /**

src/core/mesh/qgsmeshvectorrenderer.cpp

@@ -62,11 +62,11 @@ QgsMeshVectorArrowRenderer::QgsMeshVectorArrowRenderer(
   , mDatasetValuesMag( datasetValuesMag )
   , mMinMag( datasetMagMinimumValue )
   , mMaxMag( datasetMagMaximumValue )
+  , mDataType( dataType )
+  , mBufferedExtent( context.mapExtent() )
   , mContext( context )
   , mCfg( settings )
-  , mDataType( dataType )
   , mOutputSize( size )
-  , mBufferedExtent( context.mapExtent() )
 {
   // should be checked in caller
   Q_ASSERT( !mDatasetValuesMag.empty() );
@@ -292,7 +292,7 @@ void QgsMeshVectorArrowRenderer::drawVectorDataOnPoints( const QSet<int> indexes
     const double V = mDatasetValuesMag[i];  // pre-calculated magnitude
     const QgsPointXY lineStart = mContext.mapToPixel().transform( center.x(), center.y() );
 
-    drawVectorArrow( lineStart, xVal, yVal, V );
+    drawVector( lineStart, xVal, yVal, V );
   }
 }
 
@@ -405,13 +405,13 @@ void QgsMeshVectorArrowRenderer::drawVectorDataOnGrid( )
           continue;
 
         const QgsPointXY lineStart( x, y );
-        drawVectorArrow( lineStart, val.x(), val.y(), val.scalar() );
+        drawVector( lineStart, val.x(), val.y(), val.scalar() );
       }
     }
   }
 }
 
-void QgsMeshVectorArrowRenderer::drawVectorArrow( const QgsPointXY &lineStart, double xVal, double yVal, double magnitude )
+void QgsMeshVectorArrowRenderer::drawVector( const QgsPointXY &lineStart, double xVal, double yVal, double magnitude )
 {
   QgsPointXY lineEnd;
   double vectorLength;
@@ -518,10 +518,163 @@ QgsMeshVectorRenderer *QgsMeshVectorRenderer::makeVectorRenderer(
         layerExtent,
         datasetMagMaximumValue );
       break;
+    case QgsMeshRendererVectorSettings::WindBarbs:
+      renderer = new QgsMeshVectorWindBarbRenderer(
+        m,
+        datasetVectorValues,
+        datasetValuesMag,
+        datasetMagMaximumValue,
+        datasetMagMinimumValue,
+        dataType,
+        settings,
+        context,
+        size );
+      break;
   }
 
   return renderer;
 }
 
 
+QgsMeshVectorWindBarbRenderer::QgsMeshVectorWindBarbRenderer(
+  const QgsTriangularMesh &m,
+  const QgsMeshDataBlock &datasetValues,
+  const QVector<double> &datasetValuesMag,
+  double datasetMagMaximumValue, double datasetMagMinimumValue,
+  QgsMeshDatasetGroupMetadata::DataType dataType,
+  const QgsMeshRendererVectorSettings &settings,
+  QgsRenderContext &context,
+  QSize size )  : QgsMeshVectorArrowRenderer( m,
+        datasetValues,
+        datasetValuesMag,
+        datasetMagMinimumValue,
+        datasetMagMaximumValue,
+        dataType,
+        settings,
+        context,
+        size )
+{
+}
+
+QgsMeshVectorWindBarbRenderer::~QgsMeshVectorWindBarbRenderer() = default;
+
+void QgsMeshVectorWindBarbRenderer::drawVector( const QgsPointXY &lineStart, double xVal, double yVal, double magnitude )
+{
+  // do not render if magnitude is outside of the filtered range (if filtering is enabled)
+  if ( mCfg.filterMin() >= 0 && magnitude < mCfg.filterMin() )
+    return;
+  if ( mCfg.filterMax() >= 0 && magnitude > mCfg.filterMax() )
+    return;
+
+  QPen pen( mContext.painter()->pen() );
+  pen.setColor( mVectorColoring.color( magnitude ) );
+  mContext.painter()->setPen( pen );
+
+  // we need a brush to fill center circle and pennants
+  QBrush brush( pen.color() );
+  mContext.painter()->setBrush( brush );
+
+  const double shaftLength = mContext.convertToPainterUnits( mCfg.windBarbSettings().shaftLength(),
+                             mCfg.windBarbSettings().shaftLengthUnits() );
+  const double d = shaftLength / 25; // this is a magic number ratio between shaft length and other barb dimensions
+  const double centerRadius = d;
+  const double zeroCircleRadius = 2 * d;
+  const double barbLength = 8 * d + pen.widthF();
+  const double barbAngle = 135;
+  const double barbOffset = 2 * d + pen.widthF();
+
+  // Determine the angle of the vector, counter-clockwise, from east
+  // (and associated trigs)
+  const double vectorAngle = -1.0 * atan( ( -1.0 * yVal ) / xVal ) - mContext.mapToPixel().mapRotation() * M_DEG2RAD;
+  const double cosAlpha = cos( vectorAngle ) * mag( xVal );
+  const double sinAlpha = sin( vectorAngle ) * mag( xVal );
+
+  // Now determine the X and Y distances of the end of the line from the start
+  // Flip the Y axis (pixel vs real-world axis)
+  const double xDist = cosAlpha * shaftLength;
+  const double yDist = - sinAlpha * shaftLength;
+
+  if ( std::abs( xDist ) < 1 && std::abs( yDist ) < 1 )
+    return;
+
+  // Determine the line coords
+  const QgsPointXY lineEnd = QgsPointXY( lineStart.x() - xDist,
+                                         lineStart.y() - yDist );
+
+  // Check to see if both of the coords are outside the QImage area, if so, skip the whole vector
+  if ( ( lineStart.x() < 0 || lineStart.x() > mOutputSize.width() ||
+         lineStart.y() < 0 || lineStart.y() > mOutputSize.height() ) &&
+       ( lineEnd.x() < 0   || lineEnd.x() > mOutputSize.width() ||
+         lineEnd.y() < 0   || lineEnd.y() > mOutputSize.height() ) )
+    return;
+
+  // scale the magnitude to convert it to knots
+  double knots = magnitude * mCfg.windBarbSettings().magnitudeMultiplier() ;
+  QgsPointXY nextLineOrigin = lineEnd;
+
+  // special case for no wind, just an empty circle
+  if ( knots < 2.5 )
+  {
+    mContext.painter()->setBrush( Qt::NoBrush );
+    mContext.painter()->drawEllipse( lineStart.toQPointF(), zeroCircleRadius, zeroCircleRadius );
+    mContext.painter()->setBrush( brush );
+    return;
+  }
+
+  const double azimuth = lineEnd.azimuth( lineStart );
+
+  // conditionally draw the shaft
+  if ( knots < 47.5 && knots > 7.5 )
+  {
+    // When first barb is a '10', we want to draw the shaft and barb as a single polyline for a proper join
+    const QVector< QPointF > pts{ lineStart.toQPointF(),
+                                  lineEnd.toQPointF(),
+                                  nextLineOrigin.project( barbLength, azimuth + barbAngle ).toQPointF() };
+    mContext.painter()->drawPolyline( pts );
+    nextLineOrigin = nextLineOrigin.project( barbOffset, azimuth );
+    knots -= 10;
+  }
+  else
+  {
+    // draw just the shaft
+    mContext.painter()->drawLine( lineStart.toQPointF(), lineEnd.toQPointF() );
+  }
+
+  // draw the center circle
+  mContext.painter()->drawEllipse( lineStart.toQPointF(), centerRadius, centerRadius );
+
+  // draw pennants (50)
+  while ( knots > 47.5 )
+  {
+    const QVector< QPointF > pts{ nextLineOrigin.toQPointF(),
+                                  nextLineOrigin.project( barbLength / 1.414, azimuth + 90 ).toQPointF(),
+                                  nextLineOrigin.project( barbLength / 1.414, azimuth ).toQPointF() };
+    mContext.painter()->drawPolygon( pts );
+    knots -= 50;
+
+    // don't use an offset for the next pennant
+    if ( knots > 47.5 )
+      nextLineOrigin = nextLineOrigin.project( barbLength / 1.414, azimuth );
+    else
+      nextLineOrigin = nextLineOrigin.project( barbLength / 1.414 + barbOffset, azimuth );
+  }
+
+  // draw large barbs (10)
+  while ( knots > 7.5 )
+  {
+    mContext.painter()->drawLine( nextLineOrigin.toQPointF(), nextLineOrigin.project( barbLength, azimuth + barbAngle ).toQPointF() );
+    nextLineOrigin = nextLineOrigin.project( barbOffset, azimuth );
+    knots -= 10;
+  }
+
+  // draw small barb (5)
+  if ( knots > 2.5 )
+  {
+    // a single '5' barb should not start at the line end
+    if ( nextLineOrigin == lineEnd )
+      nextLineOrigin = nextLineOrigin.project( barbLength / 2, azimuth );
+
+    mContext.painter()->drawLine( nextLineOrigin.toQPointF(), nextLineOrigin.project( barbLength / 2, azimuth + barbAngle ).toQPointF() );
+  }
+}
 ///@endcond

src/core/mesh/qgsmeshvectorrenderer.h

@@ -105,7 +105,7 @@ class QgsMeshVectorArrowRenderer : public QgsMeshVectorRenderer
     //! Draws data on user-defined grid
     void drawVectorDataOnGrid( );
     //! Draws arrow from start point and vector data
-    void drawVectorArrow( const QgsPointXY &lineStart, double xVal, double yVal, double magnitude );
+    virtual void drawVector( const QgsPointXY &lineStart, double xVal, double yVal, double magnitude );
     //! Calculates the end point of the arrow based on start point and vector data
     bool calcVectorLineEnd( QgsPointXY &lineEnd,
                             double &vectorLength,
@@ -130,18 +130,46 @@ class QgsMeshVectorArrowRenderer : public QgsMeshVectorRenderer
     const QVector<double> &mDatasetValuesMag; //magnitudes
     double mMinMag = 0.0;
     double mMaxMag = 0.0;
-    QgsRenderContext &mContext;
-    const QgsMeshRendererVectorSettings mCfg;
     QgsMeshDatasetGroupMetadata::DataType mDataType = QgsMeshDatasetGroupMetadata::DataType::DataOnVertices;
-    QSize mOutputSize;
     QgsRectangle mBufferedExtent;
     QPen mPen;
 
+  protected:
+    QgsRenderContext &mContext;
+    const QgsMeshRendererVectorSettings mCfg;
+    QSize mOutputSize;
     QgsInterpolatedLineColor mVectorColoring;
 
 };
 
+/**
+ * \ingroup core
+ *
+ * \brief Helper private class for rendering vector datasets using Wind Barbs
+ *
+ * \note not available in Python bindings
+ * \since QGIS 3.38
+ */
+class QgsMeshVectorWindBarbRenderer : public QgsMeshVectorArrowRenderer
+{
+  public:
+    //! Ctor
+    QgsMeshVectorWindBarbRenderer( const QgsTriangularMesh &m,
+                                   const QgsMeshDataBlock &datasetValues,
+                                   const QVector<double> &datasetValuesMag,
+                                   double datasetMagMaximumValue,
+                                   double datasetMagMinimumValue,
+                                   QgsMeshDatasetGroupMetadata::DataType dataType,
+                                   const QgsMeshRendererVectorSettings &settings,
+                                   QgsRenderContext &context,
+                                   QSize size );
+    //! Dtor
+    ~QgsMeshVectorWindBarbRenderer() override;
 
+  private:
+    void drawVector( const QgsPointXY &lineStart, double xVal, double yVal, double magnitude ) override;
+
+};
 
 ///@endcond
 

src/gui/mesh/qgsmeshrenderervectorsettingswidget.cpp

@@ -27,7 +27,8 @@ QgsMeshRendererVectorSettingsWidget::QgsMeshRendererVectorSettingsWidget( QWidge
   widgets << mMinMagSpinBox << mMaxMagSpinBox
           << mHeadWidthSpinBox << mHeadLengthSpinBox
           << mMinimumShaftSpinBox << mMaximumShaftSpinBox
-          << mScaleShaftByFactorOfSpinBox << mShaftLengthSpinBox;
+          << mScaleShaftByFactorOfSpinBox << mShaftLengthSpinBox
+          << mWindBarbLengthSpinBox << mWindBarbMagnitudeMultiplierSpinBox;
 
   // Setup defaults and clear values for spin boxes
   for ( const auto &widget : std::as_const( widgets ) )
@@ -48,6 +49,9 @@ QgsMeshRendererVectorSettingsWidget::QgsMeshRendererVectorSettingsWidget( QWidge
   mTracesParticlesCountSpinBox->setClearValue( 1000 );
   mTracesMaxLengthSpinBox->setClearValue( 100.0 );
 
+  mWindBarbLengthSpinBox->setClearValue( 10.0 );
+  mWindBarbMagnitudeMultiplierSpinBox->setClearValue( 1.0 );
+
   connect( mColorWidget, &QgsColorButton::colorChanged, this, &QgsMeshRendererVectorSettingsWidget::widgetChanged );
   connect( mColoringMethodComboBox, qOverload<int>( &QComboBox::currentIndexChanged ),
            this, &QgsMeshRendererVectorSettingsWidget::onColoringMethodChanged );
@@ -114,6 +118,19 @@ QgsMeshRendererVectorSettingsWidget::QgsMeshRendererVectorSettingsWidget( QWidge
 
   connect( mTracesTailLengthMapUnitWidget, &QgsUnitSelectionWidget::changed,
            this, &QgsMeshRendererVectorSettingsWidget::widgetChanged );
+
+  mWindBarbLengthMapUnitWidget->setUnits(
+  {
+    Qgis::RenderUnit::Millimeters,
+    Qgis::RenderUnit::Pixels,
+    Qgis::RenderUnit::Points
+  } );
+
+  connect( mWindBarbLengthMapUnitWidget, &QgsUnitSelectionWidget::changed,
+           this, &QgsMeshRendererVectorSettingsWidget::widgetChanged );
+  connect( mWindBarbUnitsComboBox, qOverload<int>( &QComboBox::currentIndexChanged ),
+           this, &QgsMeshRendererVectorSettingsWidget::onWindBarbUnitsChanged );
+  onWindBarbUnitsChanged( 0 );
 }
 
 void QgsMeshRendererVectorSettingsWidget::setLayer( QgsMeshLayer *layer )
@@ -191,6 +208,15 @@ QgsMeshRendererVectorSettings QgsMeshRendererVectorSettingsWidget::settings() co
   tracesSettings.setParticlesCount( mTracesParticlesCountSpinBox->value() );
   settings.setTracesSettings( tracesSettings );
 
+  // Wind Barb settings
+  QgsMeshRendererVectorWindBarbSettings windBarbSettings;
+  windBarbSettings.setShaftLength( mWindBarbLengthSpinBox->value() );
+  windBarbSettings.setShaftLengthUnits( mWindBarbLengthMapUnitWidget->unit() );
+  windBarbSettings.setMagnitudeUnits(
+    static_cast<QgsMeshRendererVectorWindBarbSettings::WindSpeedUnit>( mWindBarbUnitsComboBox->currentIndex() ) );
+  windBarbSettings.setMagnitudeMultiplier( mWindBarbMagnitudeMultiplierSpinBox->value() );
+  settings.setWindBarbSettings( windBarbSettings );
+
   return settings;
 }
 
@@ -264,6 +290,12 @@ void QgsMeshRendererVectorSettingsWidget::syncToLayer( )
   mTracesTailLengthMapUnitWidget->setUnit( tracesSettings.maximumTailLengthUnit() );
   mTracesParticlesCountSpinBox->setValue( tracesSettings.particlesCount() );
 
+  // Wind Barb settings
+  const QgsMeshRendererVectorWindBarbSettings windBarbSettings = settings.windBarbSettings();
+  mWindBarbLengthSpinBox->setValue( windBarbSettings.shaftLength() );
+  mWindBarbMagnitudeMultiplierSpinBox->setValue( windBarbSettings.magnitudeMultiplier() );
+  mWindBarbUnitsComboBox->setCurrentIndex( static_cast<int>( windBarbSettings.magnitudeUnits() ) );
+  onWindBarbUnitsChanged( static_cast<int>( windBarbSettings.magnitudeUnits() ) );
 }
 
 void QgsMeshRendererVectorSettingsWidget::onSymbologyChanged( int currentIndex )
@@ -272,6 +304,7 @@ void QgsMeshRendererVectorSettingsWidget::onSymbologyChanged( int currentIndex )
   mArrowLengthGroupBox->setVisible( currentIndex == QgsMeshRendererVectorSettings::Arrows );
   mHeadOptionsGroupBox->setVisible( currentIndex == QgsMeshRendererVectorSettings::Arrows );
   mTracesGroupBox->setVisible( currentIndex == QgsMeshRendererVectorSettings::Traces );
+  mWindBarbGroupBox->setVisible( currentIndex == QgsMeshRendererVectorSettings::WindBarbs );
 
   mDisplayVectorsOnGridGroupBox->setVisible( currentIndex != QgsMeshRendererVectorSettings::Traces );
   filterByMagnitudeLabel->setVisible( currentIndex != QgsMeshRendererVectorSettings::Traces );
@@ -282,6 +315,7 @@ void QgsMeshRendererVectorSettingsWidget::onSymbologyChanged( int currentIndex )
 
   mDisplayVectorsOnGridGroupBox->setEnabled(
     currentIndex == QgsMeshRendererVectorSettings::Arrows ||
+    currentIndex == QgsMeshRendererVectorSettings::WindBarbs ||
     ( currentIndex == QgsMeshRendererVectorSettings::Streamlines &&
       mStreamlinesSeedingMethodComboBox->currentIndex() == QgsMeshRendererVectorStreamlineSettings::MeshGridded ) ) ;
 }
@@ -295,6 +329,36 @@ void QgsMeshRendererVectorSettingsWidget::onStreamLineSeedingMethodChanged( int
   mDisplayVectorsOnGridGroupBox->setEnabled( !enabled );
 }
 
+void QgsMeshRendererVectorSettingsWidget::onWindBarbUnitsChanged( int currentIndex )
+{
+  const QgsMeshRendererVectorWindBarbSettings::WindSpeedUnit units =
+    static_cast<QgsMeshRendererVectorWindBarbSettings::WindSpeedUnit>( currentIndex );
+  double multiplier;
+  switch ( units )
+  {
+    case QgsMeshRendererVectorWindBarbSettings::WindSpeedUnit::Knots:
+    case QgsMeshRendererVectorWindBarbSettings::WindSpeedUnit::OtherUnit:
+      multiplier = 1.0;
+      break;
+    case QgsMeshRendererVectorWindBarbSettings::WindSpeedUnit::MetersPerSecond:
+      multiplier = 3600.0 / 1852.0;
+      break;
+    case QgsMeshRendererVectorWindBarbSettings::WindSpeedUnit::KilometersPerHour:
+      multiplier = 1.852;
+      break;
+    case QgsMeshRendererVectorWindBarbSettings::WindSpeedUnit::MilesPerHour:
+      multiplier = 1.609344 / 1.852;
+      break;
+    case QgsMeshRendererVectorWindBarbSettings::WindSpeedUnit::FeetPerSecond:
+      multiplier = 3600.0 / 1.852 / 5280.0 * 1.609344 ;
+      break;
+  }
+
+  mWindBarbMagnitudeMultiplierLabel->setVisible( units == QgsMeshRendererVectorWindBarbSettings::WindSpeedUnit::OtherUnit );
+  mWindBarbMagnitudeMultiplierSpinBox->setVisible( units == QgsMeshRendererVectorWindBarbSettings::WindSpeedUnit::OtherUnit );
+  mWindBarbMagnitudeMultiplierSpinBox->setValue( multiplier );
+}
+
 void QgsMeshRendererVectorSettingsWidget::onColoringMethodChanged()
 {
   mColorRampShaderGroupBox->setVisible( mColoringMethodComboBox->currentData() == QgsInterpolatedLineColor::ColorRamp );

src/gui/mesh/qgsmeshrenderervectorsettingswidget.h

@@ -68,6 +68,7 @@ class QgsMeshRendererVectorSettingsWidget : public QWidget, private Ui::QgsMeshR
   private slots:
     void onSymbologyChanged( int currentIndex );
     void onStreamLineSeedingMethodChanged( int currentIndex );
+    void onWindBarbUnitsChanged( int currentIndex );
     void onColoringMethodChanged();
     void onColorRampMinMaxChanged();
     void loadColorRampShader();

src/ui/mesh/qgsmeshrenderervectorsettingswidgetbase.ui

@@ -6,8 +6,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>399</width>
-    <height>861</height>
+    <width>426</width>
+    <height>1006</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -26,20 +26,7 @@
    <property name="bottomMargin">
     <number>0</number>
    </property>
-   <item row="5" column="1">
-    <widget class="QgsColorButton" name="mColorWidget">
-     <property name="minimumSize">
-      <size>
-       <width>120</width>
-       <height>0</height>
-      </size>
-     </property>
-    </widget>
-   </item>
-   <item row="4" column="1">
-    <widget class="QComboBox" name="mColoringMethodComboBox"/>
-   </item>
-   <item row="15" column="0">
+   <item row="16" column="0">
     <spacer name="verticalSpacer">
      <property name="orientation">
       <enum>Qt::Vertical</enum>
@@ -52,94 +39,65 @@
      </property>
     </spacer>
    </item>
-   <item row="14" column="0" colspan="2">
-    <widget class="QGroupBox" name="mTracesGroupBox">
-     <property name="title">
-      <string>Traces</string>
+   <item row="7" column="0" colspan="2">
+    <layout class="QGridLayout" name="gridLayout_3">
+     <item row="0" column="0" rowspan="2">
+      <widget class="QLabel" name="filterByMagnitudeLabel">
+       <property name="text">
+        <string>Filter by magnitude</string>
+       </property>
+      </widget>
+     </item>
+     <item row="1" column="1">
+      <widget class="QLabel" name="maximumMagLabel">
+       <property name="text">
+        <string>Max</string>
+       </property>
+      </widget>
+     </item>
+     <item row="1" column="2">
+      <widget class="QgsDoubleSpinBox" name="mMaxMagSpinBox">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
+       <property name="minimum">
+        <double>-1000000000000000.000000000000000</double>
+       </property>
+       <property name="maximum">
+        <double>1000000000000000.000000000000000</double>
+       </property>
+      </widget>
+     </item>
+     <item row="0" column="1">
+      <widget class="QLabel" name="minimumMagLabel">
+       <property name="text">
+        <string>Min</string>
+       </property>
+      </widget>
+     </item>
+     <item row="0" column="2">
+      <widget class="QgsDoubleSpinBox" name="mMinMagSpinBox">
+       <property name="minimum">
+        <double>-1000000000000000.000000000000000</double>
+       </property>
+       <property name="maximum">
+        <double>1000000000000000.000000000000000</double>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item row="5" column="1">
+    <widget class="QgsColorButton" name="mColorWidget">
+     <property name="minimumSize">
+      <size>
+       <width>120</width>
+       <height>0</height>
+      </size>
      </property>
-     <layout class="QVBoxLayout" name="verticalLayout_6">
-      <property name="sizeConstraint">
-       <enum>QLayout::SetDefaultConstraint</enum>
-      </property>
-      <item>
-       <layout class="QHBoxLayout" name="horizontalLayout_6">
-        <property name="topMargin">
-         <number>0</number>
-        </property>
-        <item>
-         <widget class="QLabel" name="label_2">
-          <property name="text">
-           <string>Particles count</string>
-          </property>
-         </widget>
-        </item>
-        <item>
-         <widget class="QgsSpinBox" name="mTracesParticlesCountSpinBox">
-          <property name="maximum">
-           <number>1000000</number>
-          </property>
-          <property name="singleStep">
-           <number>100</number>
-          </property>
-          <property name="value">
-           <number>1000</number>
-          </property>
-         </widget>
-        </item>
-       </layout>
-      </item>
-      <item>
-       <layout class="QHBoxLayout" name="horizontalLayout_7">
-        <property name="topMargin">
-         <number>0</number>
-        </property>
-        <item>
-         <widget class="QLabel" name="label_3">
-          <property name="text">
-           <string>Max tail length</string>
-          </property>
-         </widget>
-        </item>
-        <item>
-         <widget class="QgsDoubleSpinBox" name="mTracesMaxLengthSpinBox">
-          <property name="sizePolicy">
-           <sizepolicy hsizetype="Ignored" vsizetype="Fixed">
-            <horstretch>0</horstretch>
-            <verstretch>0</verstretch>
-           </sizepolicy>
-          </property>
-          <property name="minimumSize">
-           <size>
-            <width>0</width>
-            <height>0</height>
-           </size>
-          </property>
-          <property name="maximumSize">
-           <size>
-            <width>16777215</width>
-            <height>16777215</height>
-           </size>
-          </property>
-          <property name="minimum">
-           <double>1.000000000000000</double>
-          </property>
-          <property name="maximum">
-           <double>99999999999999.000000000000000</double>
-          </property>
-          <property name="singleStep">
-           <double>10.000000000000000</double>
-          </property>
-          <property name="value">
-           <double>10.000000000000000</double>
-          </property>
-         </widget>
-        </item>
-        <item>
-         <widget class="QgsUnitSelectionWidget" name="mTracesTailLengthMapUnitWidget" native="true"/>
-        </item>
-       </layout>
-      </item>
-     </layout>
     </widget>
    </item>
    <item row="6" column="0" colspan="2">
@@ -231,13 +189,43 @@
      </layout>
     </widget>
    </item>
-   <item row="4" column="0">
-    <widget class="QLabel" name="label_4">
-     <property name="text">
-      <string>Coloring Method</string>
+   <item row="4" column="1">
+    <widget class="QComboBox" name="mColoringMethodComboBox"/>
+   </item>
+   <item row="3" column="1">
+    <widget class="QgsDoubleSpinBox" name="mLineWidthSpinBox">
+     <property name="sizePolicy">
+      <sizepolicy hsizetype="Ignored" vsizetype="Preferred">
+       <horstretch>0</horstretch>
+       <verstretch>0</verstretch>
+      </sizepolicy>
      </property>
     </widget>
    </item>
+   <item row="2" column="1">
+    <widget class="QComboBox" name="mSymbologyVectorComboBox">
+     <item>
+      <property name="text">
+       <string>Arrows</string>
+      </property>
+     </item>
+     <item>
+      <property name="text">
+       <string>Streamlines</string>
+      </property>
+     </item>
+     <item>
+      <property name="text">
+       <string>Traces</string>
+      </property>
+     </item>
+     <item>
+      <property name="text">
+       <string>Wind Barbs</string>
+      </property>
+     </item>
+    </widget>
+   </item>
    <item row="1" column="0">
     <widget class="QWidget" name="widget" native="true">
      <layout class="QVBoxLayout" name="verticalLayout_5">
@@ -256,75 +244,69 @@
      </layout>
     </widget>
    </item>
-   <item row="2" column="1">
-    <widget class="QComboBox" name="mSymbologyVectorComboBox">
-     <item>
-      <property name="text">
-       <string>Arrows</string>
-      </property>
-     </item>
-     <item>
-      <property name="text">
-       <string>Streamlines</string>
-      </property>
-     </item>
-     <item>
-      <property name="text">
-       <string>Traces</string>
-      </property>
-     </item>
+   <item row="11" column="0" colspan="2">
+    <widget class="QGroupBox" name="mHeadOptionsGroupBox">
+     <property name="title">
+      <string>Head Options</string>
+     </property>
+     <layout class="QGridLayout" name="gridLayout_4">
+      <item row="1" column="2">
+       <widget class="QLabel" name="percShaftLenLabel_2">
+        <property name="text">
+         <string>% of shaft length</string>
+        </property>
+       </widget>
+      </item>
+      <item row="0" column="1">
+       <widget class="QgsDoubleSpinBox" name="mHeadWidthSpinBox">
+        <property name="maximum">
+         <double>100.000000000000000</double>
+        </property>
+       </widget>
+      </item>
+      <item row="1" column="1">
+       <widget class="QgsDoubleSpinBox" name="mHeadLengthSpinBox">
+        <property name="sizePolicy">
+         <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+          <horstretch>0</horstretch>
+          <verstretch>0</verstretch>
+         </sizepolicy>
+        </property>
+        <property name="maximum">
+         <double>100.000000000000000</double>
+        </property>
+       </widget>
+      </item>
+      <item row="0" column="2">
+       <widget class="QLabel" name="percShaftLenLabel">
+        <property name="text">
+         <string>% of shaft length</string>
+        </property>
+       </widget>
+      </item>
+      <item row="1" column="0">
+       <widget class="QLabel" name="headLengthLabel">
+        <property name="text">
+         <string>Length</string>
+        </property>
+       </widget>
+      </item>
+      <item row="0" column="0">
+       <widget class="QLabel" name="headWidthLabel">
+        <property name="text">
+         <string>Width</string>
+        </property>
+       </widget>
+      </item>
+     </layout>
     </widget>
    </item>
-   <item row="7" column="0" colspan="2">
-    <layout class="QGridLayout" name="gridLayout_3">
-     <item row="0" column="0" rowspan="2">
-      <widget class="QLabel" name="filterByMagnitudeLabel">
-       <property name="text">
-        <string>Filter by magnitude</string>
-       </property>
-      </widget>
-     </item>
-     <item row="1" column="1">
-      <widget class="QLabel" name="maximumMagLabel">
-       <property name="text">
-        <string>Max</string>
-       </property>
-      </widget>
-     </item>
-     <item row="1" column="2">
-      <widget class="QgsDoubleSpinBox" name="mMaxMagSpinBox">
-       <property name="sizePolicy">
-        <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
-         <horstretch>0</horstretch>
-         <verstretch>0</verstretch>
-        </sizepolicy>
-       </property>
-       <property name="minimum">
-        <double>-1000000000000000.000000000000000</double>
-       </property>
-       <property name="maximum">
-        <double>1000000000000000.000000000000000</double>
-       </property>
-      </widget>
-     </item>
-     <item row="0" column="1">
-      <widget class="QLabel" name="minimumMagLabel">
-       <property name="text">
-        <string>Min</string>
-       </property>
-      </widget>
-     </item>
-     <item row="0" column="2">
-      <widget class="QgsDoubleSpinBox" name="mMinMagSpinBox">
-       <property name="minimum">
-        <double>-1000000000000000.000000000000000</double>
-       </property>
-       <property name="maximum">
-        <double>1000000000000000.000000000000000</double>
-       </property>
-      </widget>
-     </item>
-    </layout>
+   <item row="4" column="0">
+    <widget class="QLabel" name="label_4">
+     <property name="text">
+      <string>Coloring Method</string>
+     </property>
+    </widget>
    </item>
    <item row="13" column="0" colspan="2">
     <widget class="QGroupBox" name="mStreamlineWidget">
@@ -376,20 +358,6 @@
      </layout>
     </widget>
    </item>
-   <item row="2" column="0">
-    <widget class="QLabel" name="symbologyLabel">
-     <property name="text">
-      <string>Symbology</string>
-     </property>
-    </widget>
-   </item>
-   <item row="3" column="0">
-    <widget class="QLabel" name="label_6">
-     <property name="text">
-      <string>Line width</string>
-     </property>
-    </widget>
-   </item>
    <item row="10" column="0" colspan="2">
     <widget class="QGroupBox" name="mDisplayVectorsOnGridGroupBox">
      <property name="title">
@@ -457,61 +425,18 @@
      </layout>
     </widget>
    </item>
-   <item row="11" column="0" colspan="2">
-    <widget class="QGroupBox" name="mHeadOptionsGroupBox">
-     <property name="title">
-      <string>Head Options</string>
+   <item row="2" column="0">
+    <widget class="QLabel" name="symbologyLabel">
+     <property name="text">
+      <string>Symbology</string>
+     </property>
+    </widget>
+   </item>
+   <item row="3" column="0">
+    <widget class="QLabel" name="label_6">
+     <property name="text">
+      <string>Line width</string>
      </property>
-     <layout class="QGridLayout" name="gridLayout_4">
-      <item row="1" column="2">
-       <widget class="QLabel" name="percShaftLenLabel_2">
-        <property name="text">
-         <string>% of shaft length</string>
-        </property>
-       </widget>
-      </item>
-      <item row="0" column="1">
-       <widget class="QgsDoubleSpinBox" name="mHeadWidthSpinBox">
-        <property name="maximum">
-         <double>100.000000000000000</double>
-        </property>
-       </widget>
-      </item>
-      <item row="1" column="1">
-       <widget class="QgsDoubleSpinBox" name="mHeadLengthSpinBox">
-        <property name="sizePolicy">
-         <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
-          <horstretch>0</horstretch>
-          <verstretch>0</verstretch>
-         </sizepolicy>
-        </property>
-        <property name="maximum">
-         <double>100.000000000000000</double>
-        </property>
-       </widget>
-      </item>
-      <item row="0" column="2">
-       <widget class="QLabel" name="percShaftLenLabel">
-        <property name="text">
-         <string>% of shaft length</string>
-        </property>
-       </widget>
-      </item>
-      <item row="1" column="0">
-       <widget class="QLabel" name="headLengthLabel">
-        <property name="text">
-         <string>Length</string>
-        </property>
-       </widget>
-      </item>
-      <item row="0" column="0">
-       <widget class="QLabel" name="headWidthLabel">
-        <property name="text">
-         <string>Width</string>
-        </property>
-       </widget>
-      </item>
-     </layout>
     </widget>
    </item>
    <item row="5" column="0">
@@ -521,16 +446,6 @@
      </property>
     </widget>
    </item>
-   <item row="3" column="1">
-    <widget class="QgsDoubleSpinBox" name="mLineWidthSpinBox">
-     <property name="sizePolicy">
-      <sizepolicy hsizetype="Ignored" vsizetype="Preferred">
-       <horstretch>0</horstretch>
-       <verstretch>0</verstretch>
-      </sizepolicy>
-     </property>
-    </widget>
-   </item>
    <item row="12" column="0" colspan="2">
     <widget class="QGroupBox" name="mArrowLengthGroupBox">
      <property name="title">
@@ -670,6 +585,184 @@
      </layout>
     </widget>
    </item>
+   <item row="14" column="0" colspan="2">
+    <widget class="QGroupBox" name="mTracesGroupBox">
+     <property name="title">
+      <string>Traces</string>
+     </property>
+     <layout class="QVBoxLayout" name="verticalLayout_6">
+      <property name="sizeConstraint">
+       <enum>QLayout::SetDefaultConstraint</enum>
+      </property>
+      <item>
+       <layout class="QHBoxLayout" name="horizontalLayout_6">
+        <property name="topMargin">
+         <number>0</number>
+        </property>
+        <item>
+         <widget class="QLabel" name="label_2">
+          <property name="text">
+           <string>Particles count</string>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QgsSpinBox" name="mTracesParticlesCountSpinBox">
+          <property name="maximum">
+           <number>1000000</number>
+          </property>
+          <property name="singleStep">
+           <number>100</number>
+          </property>
+          <property name="value">
+           <number>1000</number>
+          </property>
+         </widget>
+        </item>
+       </layout>
+      </item>
+      <item>
+       <layout class="QHBoxLayout" name="horizontalLayout_7">
+        <property name="topMargin">
+         <number>0</number>
+        </property>
+        <item>
+         <widget class="QLabel" name="label_3">
+          <property name="text">
+           <string>Max tail length</string>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QgsDoubleSpinBox" name="mTracesMaxLengthSpinBox">
+          <property name="sizePolicy">
+           <sizepolicy hsizetype="Ignored" vsizetype="Fixed">
+            <horstretch>0</horstretch>
+            <verstretch>0</verstretch>
+           </sizepolicy>
+          </property>
+          <property name="minimumSize">
+           <size>
+            <width>0</width>
+            <height>0</height>
+           </size>
+          </property>
+          <property name="maximumSize">
+           <size>
+            <width>16777215</width>
+            <height>16777215</height>
+           </size>
+          </property>
+          <property name="minimum">
+           <double>1.000000000000000</double>
+          </property>
+          <property name="maximum">
+           <double>99999999999999.000000000000000</double>
+          </property>
+          <property name="singleStep">
+           <double>10.000000000000000</double>
+          </property>
+          <property name="value">
+           <double>10.000000000000000</double>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QgsUnitSelectionWidget" name="mTracesTailLengthMapUnitWidget" native="true"/>
+        </item>
+       </layout>
+      </item>
+     </layout>
+    </widget>
+   </item>
+   <item row="15" column="0" colspan="2">
+    <widget class="QGroupBox" name="mWindBarbGroupBox">
+     <property name="title">
+      <string>Wind Barbs</string>
+     </property>
+     <layout class="QFormLayout" name="formLayout_4">
+      <item row="1" column="0">
+       <widget class="QLabel" name="windBarbLengthLabel">
+        <property name="text">
+         <string>Length</string>
+        </property>
+       </widget>
+      </item>
+      <item row="2" column="0">
+       <widget class="QLabel" name="windBarbUnitsLabel">
+        <property name="text">
+         <string>Data units</string>
+        </property>
+       </widget>
+      </item>
+      <item row="2" column="1">
+       <widget class="QComboBox" name="mWindBarbUnitsComboBox">
+        <property name="toolTip">
+         <string>Select the units the data are in.&lt;br&gt;Values are converted to knots for rendering the wind barbs.</string>
+        </property>
+        <item>
+         <property name="text">
+          <string>m/s</string>
+         </property>
+        </item>
+        <item>
+         <property name="text">
+          <string>km/h</string>
+         </property>
+        </item>
+        <item>
+         <property name="text">
+          <string>knots</string>
+         </property>
+        </item>
+        <item>
+         <property name="text">
+          <string>mi/h</string>
+         </property>
+        </item>
+        <item>
+         <property name="text">
+          <string>ft/s</string>
+         </property>
+        </item>
+        <item>
+         <property name="text">
+          <string>other units</string>
+         </property>
+        </item>
+       </widget>
+      </item>
+      <item row="3" column="0">
+       <widget class="QLabel" name="mWindBarbMagnitudeMultiplierLabel">
+        <property name="text">
+         <string>Multiplier</string>
+        </property>
+       </widget>
+      </item>
+      <item row="3" column="1">
+       <widget class="QgsDoubleSpinBox" name="mWindBarbMagnitudeMultiplierSpinBox">
+        <property name="toolTip">
+         <string>Data will be multiplied by this value to be converted to knots (nautical miles per hour)</string>
+        </property>
+       </widget>
+      </item>
+      <item row="1" column="1">
+       <layout class="QHBoxLayout" name="horizontalLayout_2">
+        <item>
+         <widget class="QgsDoubleSpinBox" name="mWindBarbLengthSpinBox">
+          <property name="toolTip">
+           <string>This defines the shaft length.&lt;br&gt;The pennants and barbs are scaled proportionally.</string>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QgsUnitSelectionWidget" name="mWindBarbLengthMapUnitWidget" native="true"/>
+        </item>
+       </layout>
+      </item>
+     </layout>
+    </widget>
+   </item>
   </layout>
  </widget>
  <customwidgets>

tests/src/core/testqgsmeshlayerrenderer.cpp

@@ -85,6 +85,7 @@ class TestQgsMeshRenderer : public QgsTest
     void test_face_vector_on_user_grid();
     void test_face_vector_on_user_grid_streamlines();
     void test_vertex_vector_on_user_grid();
+    void test_vertex_vector_on_user_grid_wind_barbs();
     void test_vertex_vector_on_user_grid_streamlines();
     void test_vertex_vector_on_user_grid_streamlines_colorRamp();
     void test_vertex_vector_traces();
@@ -161,6 +162,7 @@ void TestQgsMeshRenderer::initTestCase()
   // Mdal layer
   mMdalLayer = new QgsMeshLayer( mDataDir + "/quad_and_triangle.2dm", "Triangle and Quad Mdal", "mdal" );
   mMdalLayer->dataProvider()->addDataset( mDataDir + "/quad_and_triangle_vertex_scalar_with_inactive_face.dat" );
+  mMdalLayer->dataProvider()->addDataset( mDataDir + "/quad_and_triangle_vertex_vector2.dat" );
   QVERIFY( mMdalLayer->isValid() );
 
   // Memory layer
@@ -474,6 +476,34 @@ void TestQgsMeshRenderer::test_vertex_scalar_dataset_with_inactive_face_renderin
   QVERIFY( imageCheck( "quad_and_triangle_vertex_scalar_dataset_with_inactive_face", mMdalLayer ) );
 }
 
+void TestQgsMeshRenderer::test_vertex_vector_on_user_grid_wind_barbs()
+{
+  const QgsMeshDatasetIndex ds( 2, 0 );
+  const QgsMeshDatasetGroupMetadata metadata = mMdalLayer->dataProvider()->datasetGroupMetadata( ds );
+  QCOMPARE( metadata.name(), QStringLiteral( "VertexVectorDataset2" ) );
+
+  QgsMeshRendererSettings rendererSettings = mMdalLayer->rendererSettings();
+  QgsMeshRendererVectorSettings settings = rendererSettings.vectorSettings( ds.group() );
+  settings.setOnUserDefinedGrid( true );
+  settings.setUserGridCellWidth( 30 );
+  settings.setUserGridCellHeight( 30 );
+  settings.setLineWidth( 0.5 );
+  settings.setSymbology( QgsMeshRendererVectorSettings::WindBarbs );
+  settings.setColoringMethod( QgsInterpolatedLineColor::SingleColor );
+  QgsMeshRendererVectorWindBarbSettings windBarbSettings = settings.windBarbSettings();
+  windBarbSettings.setShaftLength( 20 );
+  windBarbSettings.setShaftLengthUnits( Qgis::RenderUnit::Pixels );
+  windBarbSettings.setMagnitudeUnits( QgsMeshRendererVectorWindBarbSettings::WindSpeedUnit::OtherUnit );
+  windBarbSettings.setMagnitudeMultiplier( 2 );
+  settings.setWindBarbSettings( windBarbSettings );
+  rendererSettings.setVectorSettings( ds.group(), settings );
+  mMdalLayer->setRendererSettings( rendererSettings );
+  mMdalLayer->setStaticVectorDatasetIndex( ds );
+
+  QVERIFY( imageCheck( "quad_and_triangle_vertex_vector_user_grid_dataset_wind_barbs", mMemoryLayer ) );
+  QVERIFY( imageCheck( "quad_and_triangle_vertex_vector_user_grid_dataset_wind_barbs_rotated_45", mMemoryLayer, 45.0 ) );
+}
+
 void TestQgsMeshRenderer::test_face_vector_on_user_grid()
 {
   const QgsMeshDatasetIndex ds( 3, 0 );