+void SketchPlugin_ConstraintLength::attributeChanged(const std::string& theID) {
+ if (theID == SketchPlugin_Constraint::ENTITY_A())
+ {
+ std::shared_ptr<ModelAPI_AttributeDouble> aValueAttr = std::dynamic_pointer_cast<
+ ModelAPI_AttributeDouble>(data()->attribute(SketchPlugin_Constraint::VALUE()));
+ if (!aValueAttr->isInitialized()) { // only if it is not initialized, try to compute the current value
+ std::shared_ptr<GeomAPI_Pnt> aPoint1, aPoint2;
+ std::shared_ptr<GeomDataAPI_Point2D> aStartPoint, anEndPoint;
+ if (getPoints(aPoint1, aPoint2, aStartPoint, anEndPoint)) {
+ double aLength = aPoint1->distance(aPoint2);
+ aValueAttr->setValue(aLength);
+ }
+ }
+ }
+}