+ std::shared_ptr<ModelAPI_AttributeRefAttr> aRef = std::dynamic_pointer_cast<
+ ModelAPI_AttributeRefAttr>(data()->attribute(SketchPlugin_Constraint::ENTITY_A()));
+ FeaturePtr aFeature = ModelAPI_Feature::feature(aRef->object());
+ if (aFeature) {
+ // set length value
+ std::shared_ptr<GeomDataAPI_Point2D> aPoint1 = std::dynamic_pointer_cast<
+ GeomDataAPI_Point2D>(aFeature->data()->attribute(SketchPlugin_Line::START_ID()));
+ std::shared_ptr<GeomDataAPI_Point2D> aPoint2 = std::dynamic_pointer_cast<
+ GeomDataAPI_Point2D>(aFeature->data()->attribute(SketchPlugin_Line::END_ID()));
+
+ double aLenght = aPoint1->pnt()->distance(aPoint2->pnt());
+
+ //std::shared_ptr<ModelAPI_AttributeDouble> aValueAttr = std::dynamic_pointer_cast<
+ // ModelAPI_AttributeDouble>(data()->attribute(SketchPlugin_Constraint::VALUE()));
+ //if(!aValueAttr->isInitialized()) {
+ // aValueAttr->setValue(aLenght);
+ //}
+
+ // the value should to be computed here, not in the getAISObject in order to change the model value
+ // inside the object transaction. This is important for creating a constraint by preselection.
+ // The display of the presentation in this case happens after the transaction commit
+ AttributePtr aFlyOutAttribute = data()->attribute(SketchPlugin_Constraint::FLYOUT_VALUE_PNT());
+ if (!aFlyOutAttribute->isInitialized()) {
+ compute(SketchPlugin_Constraint::FLYOUT_VALUE_PNT());
+ }
+ }
+}
+
+bool SketchPlugin_ConstraintLength::compute(const std::string& theAttributeId)
+{
+ if (theAttributeId != SketchPlugin_Constraint::FLYOUT_VALUE_PNT())
+ return false;
+
+ std::shared_ptr<GeomAPI_Pnt> aPoint1, aPoint2;
+ std::shared_ptr<GeomDataAPI_Point2D> aStartPoint, anEndPoint;
+ if (!getPoints(aPoint1, aPoint2, aStartPoint, anEndPoint))
+ return false;
+
+ std::shared_ptr<GeomDataAPI_Point2D> aFlyOutAttr = std::dynamic_pointer_cast<
+ GeomDataAPI_Point2D>(data()->attribute(theAttributeId));
+
+ std::shared_ptr<GeomAPI_Lin2d> aLine =
+ std::shared_ptr<GeomAPI_Lin2d>(new GeomAPI_Lin2d(aStartPoint->pnt(), anEndPoint->pnt()));
+ double aDist = aPoint1->distance(aPoint2)/5.;
+ std::shared_ptr<GeomAPI_Pnt2d> aFPnt = aLine->shiftedLocation(aDist);
+ aFlyOutAttr->setValue(aFPnt);
+
+ return true;
+}
+
+bool SketchPlugin_ConstraintLength::getPoints(
+ std::shared_ptr<GeomAPI_Pnt>& thePoint1, std::shared_ptr<GeomAPI_Pnt>& thePoint2,
+ std::shared_ptr<GeomDataAPI_Point2D>& theStartPoint,
+ std::shared_ptr<GeomDataAPI_Point2D>& theEndPoint)
+{
+ if (!sketch())
+ return false;
+ std::shared_ptr<GeomAPI_Pln> aPlane = sketch()->plane();
+ std::shared_ptr<ModelAPI_AttributeRefAttr> anAttr = std::dynamic_pointer_cast<
+ ModelAPI_AttributeRefAttr>(data()->attribute(SketchPlugin_Constraint::ENTITY_A()));
+ if (!anAttr)
+ return false;
+ FeaturePtr aFeature = ModelAPI_Feature::feature(anAttr->object());
+ if (!aFeature || aFeature->getKind() != SketchPlugin_Line::ID())
+ return false;
+ DataPtr aData = aFeature->data();
+ theStartPoint = std::dynamic_pointer_cast<
+ GeomDataAPI_Point2D>(aData->attribute(SketchPlugin_Line::START_ID()));
+ theEndPoint = std::dynamic_pointer_cast<
+ GeomDataAPI_Point2D>(aData->attribute(SketchPlugin_Line::END_ID()));
+ thePoint1 = sketch()->to3D(theStartPoint->x(), theStartPoint->y());
+ thePoint2 = sketch()->to3D(theEndPoint->x(), theEndPoint->y());
+ return true;