GuiCommand: Name: Sketcher CreateEllipseByCenter MenuLocation: Sketch , Sketcher geometries , Create ellipse by center Workbenches: Sketcher_Workbench Shortcut: G E E Version: 0.15 SeeAlso: Sketcher_CreateArcOfEllipse

Sketcher CreateEllipseByCenter

Description

The Sketcher CreateEllipseByCenter tool creates an ellipse by its center, an endpoint of one of its axes, and a point along the ellipse. (v1.0) : Or optionally by both endpoints of one of its axes and a point along the ellipse.

Ellipse (white) with internal geometry (dark yellow)

Usage

See also: Drawing aids.

Pos-OVP = Positional On-View-Parameters. (v1.0) Dim-OVP = Dimensional On-View-Parameters. (v1.0)

1. There are several ways to invoke the tool:
   • Press the Ellipse by center, radius, rim point button.
   • Select the Sketcher → Sketcher geometries → Create ellipse by center option from the menu.
   • Use the keyboard shortcut: G then E, then E.
2. The cursor changes to a cross with the current tool mode icon.
3. The Ellipse parameters section ((v1.0) ) is added at the top of the Sketcher Dialog.
4. Optionally press the M key or select from the dropdown list in the parameters section to change the tool mode:
   • **Center**: 1. Pick the center of the ellipse. Or with Pos-OVP: enter its X and/or Y coordinate. 2. Pick an endpoint of one of the axes of the ellipse, this also defines one of its radii. Or with Dim-OVP: enter this radius and/or the angle of this axis. 3. Pick a point to define the other radius of the ellipse. Or with Dim-OVP: enter this radius.
   • **Axis endpoints**: (v1.0) 1. Pick the endpoints of one of the axes of the ellipse, this also defines one of its radii. Or with Pos-OVP: enter their X and/or Y coordinates. No constraints are created for these points. 2. Pick a point to define the other radius of the ellipse. Or with Pos-OVP: enter its X and/or Y coordinate. No constraint is created for this point.
5. The ellipse is created, including a set of internal geometry (major axis, minor axis and two foci), and applicable Pos-OVP and Dim-OVP based constraints are added.
6. If the tool runs in continue mode:
   1. Optionally keep creating ellipses.
   2. To finish, right-click or press Esc, or start another geometry or constraint creation tool.

Notes

• Elements of the internal geometry can be deleted. They can be recreated at any time with Sketcher RestoreInternalAlignmentGeometry.
• Once created, the major and minor axes of an ellipse are strict and cannot be swapped by resizing. This is a consequence of the solver parametrization and the same strict behavior of OpenCASCADE. An ellipse must be rotated to swap its axes.

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