+ConstraintWrapperPtr SketchSolver_ConstraintMovement::fixPointOnEllipse(
+ const EntityWrapperPtr& theConic)
+{
+ static const double scale = 0.01;
+ static const int nbParams = 6;
+ myFixedValues.reserve(nbParams); // moved point; center and focus of ellipse
+
+ EdgeWrapperPtr anEdge = std::dynamic_pointer_cast<PlaneGCSSolver_EdgeWrapper>(theConic);
+ std::shared_ptr<GCS::Ellipse> aConic = std::dynamic_pointer_cast<GCS::Ellipse>(anEdge->entity());
+
+ // major axis direction
+ double dx = *aConic->focus1.x - *aConic->center.x;
+ double dy = *aConic->focus1.y - *aConic->center.y;
+ double norm = sqrt(dx * dx + dy* dy);
+ if (norm < tolerance) {
+ dx = 1.0;
+ dy = 0.0;
+ }
+ else {
+ dx /= norm;
+ dy /= norm;
+ }
+
+ double aMajorRad = aConic->getRadMaj();
+
+ // initialize fixed values
+ myFixedValues.push_back(*aConic->center.x + dx * aMajorRad);
+ myFixedValues.push_back(*aConic->center.y + dy * aMajorRad);
+ myFixedValues.push_back(*aConic->center.x);
+ myFixedValues.push_back(*aConic->center.y);
+ myFixedValues.push_back(*aConic->focus1.x);
+ myFixedValues.push_back(*aConic->focus1.y);
+
+ // create a moved point
+ GCS::Point aPointOnEllipse = createGCSPoint(&myFixedValues[0], &myFixedValues[1]);
+
+ std::list<GCSConstraintPtr> aConstraints;
+ // point-on-circle
+ GCSConstraintPtr aNewConstraint(
+ new GCS::ConstraintPointOnEllipse(aPointOnEllipse, *aConic));
+ aNewConstraint->rescale(scale);
+ aConstraints.push_back(aNewConstraint);
+ // fixed center (x)
+ aNewConstraint = GCSConstraintPtr(
+ new GCS::ConstraintEqual(&myFixedValues[2], aConic->center.x));
+ aNewConstraint->rescale(scale);
+ aConstraints.push_back(aNewConstraint);
+ // fixed center (y)
+ aNewConstraint = GCSConstraintPtr(
+ new GCS::ConstraintEqual(&myFixedValues[3], aConic->center.y));
+ aNewConstraint->rescale(scale);
+ aConstraints.push_back(aNewConstraint);
+ // focus on the major axis
+ GCS::Point aStartPoint = createGCSPoint(&myFixedValues[2], &myFixedValues[3]);
+ GCS::Point aEndPoint = createGCSPoint(&myFixedValues[4], &myFixedValues[5]);
+ aNewConstraint = GCSConstraintPtr(
+ new GCS::ConstraintPointOnLine(aConic->focus1, aStartPoint, aEndPoint));
+ aNewConstraint->rescale(scale);
+ aConstraints.push_back(aNewConstraint);
+
+ return ConstraintWrapperPtr(
+ new PlaneGCSSolver_ConstraintWrapper(aConstraints, getType()));
+}