Use snap indicator for measure angle tool

Fixes #14954

src/app/qgsmaptoolmeasureangle.cpp

@@ -23,13 +23,14 @@
 #include "qgsrubberband.h"
 #include "qgssnappingutils.h"
 #include "qgssettings.h"
+#include "qgssnapindicator.h"
 
 #include <QMouseEvent>
 #include <cmath>
 
 QgsMapToolMeasureAngle::QgsMapToolMeasureAngle( QgsMapCanvas *canvas )
   : QgsMapTool( canvas )
-
+  , mSnapIndicator( new QgsSnapIndicator( canvas ) )
 {
   mToolName = tr( "Measure angle" );
 
@@ -44,12 +45,14 @@ QgsMapToolMeasureAngle::~QgsMapToolMeasureAngle()
 
 void QgsMapToolMeasureAngle::canvasMoveEvent( QgsMapMouseEvent *e )
 {
+  QgsPointXY point = e->snapPoint();
+  mSnapIndicator->setMatch( e->mapPointMatch() );
+
   if ( !mRubberBand || mAnglePoints.empty() || mAnglePoints.size() > 2 )
   {
     return;
   }
 
-  QgsPointXY point = snapPoint( e->pos() );
   mRubberBand->movePoint( point );
   if ( mAnglePoints.size() == 2 )
   {
@@ -103,7 +106,7 @@ void QgsMapToolMeasureAngle::canvasReleaseEvent( QgsMapMouseEvent *e )
 
   if ( mAnglePoints.size() < 3 )
   {
-    QgsPointXY newPoint = snapPoint( e->pos() );
+    QgsPointXY newPoint = e->snapPoint();
     mAnglePoints.push_back( newPoint );
     mRubberBand->addPoint( newPoint );
   }
@@ -125,6 +128,8 @@ void QgsMapToolMeasureAngle::activate()
 
 void QgsMapToolMeasureAngle::deactivate()
 {
+  mSnapIndicator->setMatch( QgsPointLocator::Match() );
+
   stopMeasuring();
   QgsMapTool::deactivate();
 }
@@ -142,12 +147,6 @@ void QgsMapToolMeasureAngle::createRubberBand()
   mRubberBand->setWidth( 3 );
 }
 
-QgsPointXY QgsMapToolMeasureAngle::snapPoint( QPoint p )
-{
-  QgsPointLocator::Match m = mCanvas->snappingUtils()->snapToMap( p );
-  return m.isValid() ? m.point() : mCanvas->getCoordinateTransform()->toMapCoordinates( p );
-}
-
 void QgsMapToolMeasureAngle::updateSettings()
 {
   if ( mAnglePoints.size() != 3 )

src/app/qgsmaptoolmeasureangle.h

@@ -23,6 +23,7 @@
 
 class QgsDisplayAngle;
 class QgsRubberBand;
+class QgsSnapIndicator;
 
 //! Map tool to measure angle between two segments
 class APP_EXPORT QgsMapToolMeasureAngle: public QgsMapTool
@@ -54,12 +55,12 @@ class APP_EXPORT QgsMapToolMeasureAngle: public QgsMapTool
 
     //! Creates a new rubber band and deletes the old one
     void createRubberBand();
-    //! Snaps point to background layers
-    QgsPointXY snapPoint( QPoint p );
 
     //! Tool for measuring
     QgsDistanceArea mDa;
 
+    std::unique_ptr<QgsSnapIndicator> mSnapIndicator;
+
   public slots:
     //! Recalculate angle if projection state changed
     void updateSettings();