fix #36585 where snapping on segments with a constraint snapped to ed…

…ges instead of vertices
qgis · May 21, 2020 · 2942312 · 2942312
1 parent 66ebe34
commit 2942312
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Showing 3 changed files with 24 additions and 15 deletions.
diff --git a/src/core/qgscadutils.cpp b/src/core/qgscadutils.cpp
@@ -42,16 +42,19 @@ QgsCadUtils::AlignMapPointOutput QgsCadUtils::alignMapPoint( const QgsPointXY &o
 
   // try to snap to anything
   QgsPointLocator::Match snapMatch = ctx.snappingUtils->snapToMap( originalMapPoint, nullptr, true );
+  res.snapMatch = snapMatch;
   QgsPointXY point = snapMatch.isValid() ? snapMatch.point() : originalMapPoint;
-
-  // try to snap explicitly to a segment - useful for some constraints
   QgsPointXY edgePt0, edgePt1;
-  EdgesOnlyFilter edgesOnlyFilter;
-  QgsPointLocator::Match edgeMatch = ctx.snappingUtils->snapToMap( originalMapPoint, &edgesOnlyFilter, true );
-  if ( edgeMatch.hasEdge() )
-    edgeMatch.edgePoints( edgePt0, edgePt1 );
-
-  res.edgeMatch = edgeMatch;
+  if ( snapMatch.hasEdge() )
+  {
+    snapMatch.edgePoints( edgePt0, edgePt1 );
+    // note : res.edgeMatch should be removed, as we can just check snapMatch.hasEdge()
+    res.edgeMatch = snapMatch;
+  }
+  else
+  {
+    res.edgeMatch = QgsPointLocator::Match();
+  }
 
   QgsPointXY previousPt, penultimatePt;
   if ( ctx.cadPointList.count() >= 2 )
@@ -71,7 +74,7 @@ QgsCadUtils::AlignMapPointOutput QgsCadUtils::alignMapPoint( const QgsPointXY &o
     {
       point.setX( previousPt.x() + ctx.xConstraint.value );
     }
-    if ( edgeMatch.hasEdge() && !ctx.yConstraint.locked )
+    if ( snapMatch.hasEdge() && !ctx.yConstraint.locked )
     {
       // intersect with snapped segment line at X coordinate
       const double dx = edgePt1.x() - edgePt0.x();
@@ -99,7 +102,7 @@ QgsCadUtils::AlignMapPointOutput QgsCadUtils::alignMapPoint( const QgsPointXY &o
     {
       point.setY( previousPt.y() + ctx.yConstraint.value );
     }
-    if ( edgeMatch.hasEdge() && !ctx.xConstraint.locked )
+    if ( snapMatch.hasEdge() && !ctx.xConstraint.locked )
     {
       // intersect with snapped segment line at Y coordinate
       const double dy = edgePt1.y() - edgePt0.y();
@@ -224,7 +227,7 @@ QgsCadUtils::AlignMapPointOutput QgsCadUtils::alignMapPoint( const QgsPointXY &o
       point.setY( previousPt.y() + sina * v );
     }
 
-    if ( edgeMatch.hasEdge() && !ctx.distanceConstraint.locked )
+    if ( snapMatch.hasEdge() && !ctx.distanceConstraint.locked )
     {
       // magnetize to the intersection of the snapped segment and the lockedAngle
 
@@ -287,7 +290,7 @@ QgsCadUtils::AlignMapPointOutput QgsCadUtils::alignMapPoint( const QgsPointXY &o
                    previousPt.y() + ( point.y() - previousPt.y() ) * vP );
       }
 
-      if ( edgeMatch.hasEdge() && !ctx.angleConstraint.locked )
+      if ( snapMatch.hasEdge() && !ctx.angleConstraint.locked )
       {
         // we will magnietize to the intersection of that segment and the lockedDistance !
         res.valid &= QgsGeometryUtils::lineCircleIntersection( previousPt, ctx.distanceConstraint.value, edgePt0, edgePt1, point );

diff --git a/src/core/qgscadutils.h b/src/core/qgscadutils.h
@@ -92,7 +92,13 @@ class CORE_EXPORT QgsCadUtils
       //! map point aligned according to the constraints
       QgsPointXY finalMapPoint;
 
-      //! Snapped segment - only valid if actually used for something
+      //! Snapped point - only valid if actually used for something
+      QgsPointLocator::Match snapMatch;
+
+      /**
+       * Snapped segment - only valid if actually used for something
+       * \deprecated will be removed in QGIS 4.0 - use snapMatch instead
+       */
       QgsPointLocator::Match edgeMatch;
 
       //! Angle (in degrees) to which we have soft-locked ourselves (if not set it is -1)

diff --git a/src/gui/qgsadvanceddigitizingdockwidget.cpp b/src/gui/qgsadvanceddigitizingdockwidget.cpp
@@ -648,10 +648,10 @@ bool QgsAdvancedDigitizingDockWidget::applyConstraints( QgsMapMouseEvent *e )
   bool res = output.valid;
   QgsPointXY point = output.finalMapPoint;
   mSnappedSegment.clear();
-  if ( output.edgeMatch.hasEdge() )
+  if ( output.snapMatch.hasEdge() )
   {
     QgsPointXY edgePt0, edgePt1;
-    output.edgeMatch.edgePoints( edgePt0, edgePt1 );
+    output.snapMatch.edgePoints( edgePt0, edgePt1 );
     mSnappedSegment << edgePt0 << edgePt1;
   }
   if ( mAngleConstraint->lockMode() != CadConstraint::HardLock )