Sketcher CreateArcOfEllipse/zh-cn

Sketcher CreateArcOfEllipse
Menu location
Sketch → Geometries → Elliptical Arc
Workbenches
Sketcher
Default shortcut
G E A
Introduced in version
0.15
See also
Sketcher CreateEllipseByCenter

描述

The Sketcher CreateArcOfEllipse tool creates an elliptical arc.

Arc of ellipse (white) with internal geometry (dark yellow)

用法

See also: Drawing aids.

Pos-OVP = Positional On-View-Parameters.
Dim-OVP = Dimensional On-View-Parameters.

introduced in 26.3: OVP support added.

1. There are several ways to invoke the tool:
   • Press the Elliptical Arc button.
   • Select the Sketch → Geometries → Elliptical Arc option from the menu.
   • Use the keyboard shortcut: G then E, then A.
2. The cursor changes to a cross with the tool icon.
3. Pick the center of the arc. Or with Pos-OVP: enter its X- and/or Y-coordinate.
4. Pick an endpoint of one of the axes of the arc, this also defines one of its radii. Or with Dim-OVP: enter this radius and/or the angle of this axis. The angle is relative to the X-axis of the sketch.
5. Pick the start point of the arc, this also defines the other radius of the arc. Or with Dim-OVP: enter this radius and/or the start parameter of the arc. The parameter is relative to the first axis of the arc. No constraint is created for this parameter.
6. Pick the endpoint of the arc. Or with Dim-OVP: enter the end parameter of the arc. The parameter is relative to the start of the arc. No constraint is created for this parameter.
7. The elliptical arc 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.
8. If the tool runs in continue mode:
   1. Optionally keep creating arcs.
   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 elliptical arc are strict and cannot be swapped by resizing. This is a consequence of the solver parametrization and the same strict behavior of OpenCASCADE. An elliptical arc must be rotated to swap its axes.