From 79b1a844d2efcc1b4c7acf43c27c97aa3accd8da Mon Sep 17 00:00:00 2001
From: nds <natalia.donis@opencascade.com>
Date: Thu, 28 May 2015 18:59:09 +0300
Subject: [PATCH] Temporary fix, which will be corrected by MPV. Crash fix:
 Create circle, translation, Undo, Redo.

The reason is that SketchPlugin_Circle::execute() flushes redisplay on 1st result creation. SketcerPrs listen it and obtains all results in the references list. The 2nd result is not created yet and it leads to crash.
---
 src/SketchPlugin/SketchPlugin_Circle.cpp      | 29 +++++++++----------
 src/SketcherPrs/SketcherPrs_Mirror.cpp        | 12 ++++++++
 .../SketcherPrs_Transformation.cpp            |  6 ++++
 3 files changed, 31 insertions(+), 16 deletions(-)

diff --git a/src/SketchPlugin/SketchPlugin_Circle.cpp b/src/SketchPlugin/SketchPlugin_Circle.cpp
index 8625d578b..1b74f50ee 100644
--- a/src/SketchPlugin/SketchPlugin_Circle.cpp
+++ b/src/SketchPlugin/SketchPlugin_Circle.cpp
@@ -55,22 +55,19 @@ void SketchPlugin_Circle::execute()
 
       // make a visible circle
       std::shared_ptr<GeomDataAPI_Dir> aNDir = std::dynamic_pointer_cast<GeomDataAPI_Dir>(
-          aSketch->data()->attribute(SketchPlugin_Sketch::NORM_ID()));
-      bool aHasPlane = aNDir && !(aNDir->x() == 0 && aNDir->y() == 0 && aNDir->z() == 0);
-      if (aHasPlane) {
-        std::shared_ptr<GeomAPI_Dir> aNormal(new GeomAPI_Dir(aNDir->x(), aNDir->y(), aNDir->z()));
-        // compute the circle radius
-        double aRadius = aRadiusAttr->value();
-
-        std::shared_ptr<GeomAPI_Shape> aCircleShape = GeomAlgoAPI_EdgeBuilder::lineCircle(
-            aCenter, aNormal, aRadius);
-        aShapes.push_back(aCircleShape);
-        std::shared_ptr<ModelAPI_ResultConstruction> aConstr2 = document()->createConstruction(
-            data(), 1);
-        aConstr2->setShape(aCircleShape);
-        aConstr2->setIsInHistory(false);
-        setResult(aConstr2, 1);
-      }
+        aSketch->data()->attribute(SketchPlugin_Sketch::NORM_ID()));
+      std::shared_ptr<GeomAPI_Dir> aNormal(new GeomAPI_Dir(aNDir->x(), aNDir->y(), aNDir->z()));
+      // compute the circle radius
+      double aRadius = aRadiusAttr->value();
+
+      std::shared_ptr<GeomAPI_Shape> aCircleShape = GeomAlgoAPI_EdgeBuilder::lineCircle(
+        aCenter, aNormal, aRadius);
+      aShapes.push_back(aCircleShape);
+      std::shared_ptr<ModelAPI_ResultConstruction> aConstr2 = document()->createConstruction(
+        data(), 1);
+      aConstr2->setShape(aCircleShape);
+      aConstr2->setIsInHistory(false);
+      setResult(aConstr2, 1);
     }
   }
 }
diff --git a/src/SketcherPrs/SketcherPrs_Mirror.cpp b/src/SketcherPrs/SketcherPrs_Mirror.cpp
index 2c680a64a..dca445bfd 100644
--- a/src/SketcherPrs/SketcherPrs_Mirror.cpp
+++ b/src/SketcherPrs/SketcherPrs_Mirror.cpp
@@ -52,11 +52,23 @@ bool SketcherPrs_Mirror::updatePoints(double theStep) const
   gp_Pnt aP1;
   for (i = 0; i < aNb; i++) {
     aObj = anAttrB->object(i);
+    if (!aObj.get()) // TODO:empty_result
+      // this check should be removed here after the result flush is corrected
+      // the problem is, that feature::execute() flushes redisplay by each result creation
+      // but it is possible(e.g. in the sketch circle, that there should be more than one result.
+      // Here, crash happens, because the second result is not created yet
+      continue;
     aP1 = aMgr->getPosition(aObj, this, theStep);
     myPntArray->SetVertice(i + 1, aP1);
   }  
   for (i = 0; i < aNb; i++) {
     aObj = anAttrC->object(i);
+    if (!aObj.get()) // TODO:empty_result
+      // this check should be removed here after the result flush is corrected
+      // the problem is, that feature::execute() flushes redisplay by each result creation
+      // but it is possible(e.g. in the sketch circle, that there should be more than one result.
+      // Here, crash happens, because the second result is not created yet
+      continue;
     aP1 = aMgr->getPosition(aObj, this, theStep);
     myPntArray->SetVertice(aNb + i + 1, aP1);
   }  
diff --git a/src/SketcherPrs/SketcherPrs_Transformation.cpp b/src/SketcherPrs/SketcherPrs_Transformation.cpp
index dcbe96667..47f32f7b5 100644
--- a/src/SketcherPrs/SketcherPrs_Transformation.cpp
+++ b/src/SketcherPrs/SketcherPrs_Transformation.cpp
@@ -47,6 +47,12 @@ bool SketcherPrs_Transformation::updatePoints(double theStep) const
   gp_Pnt aP1;
   for (i = 0; i < aNbB; i++) {
     aObj = anAttrB->object(i);
+    if (!aObj.get()) // TODO:empty_result
+      // this check should be removed here after the result flush is corrected
+      // the problem is, that feature::execute() flushes redisplay by each result creation
+      // but it is possible(e.g. in the sketch circle, that there should be more than one result.
+      // Here, crash happens, because the second result is not created yet
+      continue;
     aP1 = aMgr->getPosition(aObj, this, theStep);
     myPntArray->SetVertice(i + 1, aP1);
   }  
-- 
2.39.2