Sketcher CreateArcOfEllipse: Difference between revisions

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The [[Image:Sketcher_CreateArcOfEllipse.svg|24px]] [[Sketcher_CreateArcOfEllipse|Sketcher CreateArcOfEllipse]] tool creates an arc of ellipse by its center, an endpoint of one of its axes, and two points along the arc.
This tool draws an arc of ellipse by picking four points: the center, the end of major radius, the start point and the end point. When starting the tool, the mouse pointer changes to a white cross with a red ellipse arc icon. Besides are coordinates shown in real time.

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[[File:Sketcher_ArcOfEllipseExample1.png‎|none|500px]]
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{{Caption|The sequence of clicks is indicated by yellow arrows with numbers.<br>
C is the center, a the major diameter, b the minor diameter, F1 and F2 are foci.}}


==Usage== <!--T:4-->
==Usage== <!--T:4-->

See also: [[Sketcher_Workbench#Drawing_aids|Drawing aids]].


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# There are several ways to invoke the command:
# There are several ways to invoke the tool:
#* Press the {{Button|[[Image:Sketcher_CreateArcOfEllipse.svg|16px]] [[Sketcher_CreateArcOfEllipse|Arc of ellipse by center, major radius, endpoints]]}} button.
#* Press the {{Button|[[Image:Sketcher_CreateArcOfEllipse.svg|16px]] [[Sketcher_CreateArcOfEllipse|Arc of ellipse by center, major radius, endpoints]]}} button.
#* Select the {{MenuCommand|Sketcher → Sketcher geometries → [[Image:Sketcher_CreateArcOfEllipse.svg|16px]] Create arc of ellipse}} option from the menu.
#* Select the {{MenuCommand|Sketcher → Sketcher geometries → [[Image:Sketcher_CreateArcOfEllipse.svg|16px]] Create arc of ellipse}} option from the menu.
#* The keyboard shortcut: {{KEY|G}} then {{KEY|E}}, {{KEY|A}}.
#* Use the keyboard shortcut: {{KEY|G}} then {{KEY|E}}, then {{KEY|A}}.
# The cursor changes to a white cross with the tool icon.
# First click in 3D view sets ellipse center. Second click sets the first radius and orientation of the ellipse. Third click sets the other radius and the start of the arc. The fourth click sets the end of the arc.
# Pick the center of the arc.
# After the fourth click, the arc of ellipse is created, together with a set of construction geometry aligned to it (major diameter, minor diameter, two foci). The construction geometry can be manually deleted if not needed, and recreated later. See [[Sketcher_RestoreInternalAlignmentGeometry|Sketcher Show Hide Internal Geometry]].
# Pick an endpoint of one of the axes of the arc, this also defines one of its radii.
# Pressing {{KEY|ESC}} or clicking the right mouse button cancels the function.
# Pick the start point of the arc, this also defines the other radius of the arc.
# Pick the endpoint of the arc.
# The arc of ellipse is created, including a set of internal geometry (major axis, minor axis and two foci).
# Optionally deleted one or more elements of the internal geometry. They can be recreated at any time with [[Sketcher_RestoreInternalAlignmentGeometry|Sketcher RestoreInternalAlignmentGeometry]].


==Peculiarities== <!--T:14-->
==Peculiarities== <!--T:14-->


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* Major and minor axes of underlying ellipse are strict and cannot be swapped by resizing. The underlying ellipse must be rotated to swap the axes.
* 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.

* Unlike ellipse that can be constrained to become a circle, ellipse arc cannot represent an arc of circle.
* Moving the arc of ellipse by edge is the same as moving ellipse's center.


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Revision as of 18:07, 13 February 2024

This documentation is a work in progress. Please don't mark it as translatable since it will change in the next hours and days.

Sketcher CreateArcOfEllipse

Menu location
Sketch → Sketcher geometries → Create arc of ellipse
Workbenches
Sketcher
Default shortcut
G E A
Introduced in version
0.15
See also
Sketcher Ellipse by center

Description

The Sketcher CreateArcOfEllipse tool creates an arc of ellipse by its center, an endpoint of one of its axes, and two points along the arc.

Usage

See also: Drawing aids.

  1. There are several ways to invoke the tool:
  2. The cursor changes to a white cross with the tool icon.
  3. Pick the center of the arc.
  4. Pick an endpoint of one of the axes of the arc, this also defines one of its radii.
  5. Pick the start point of the arc, this also defines the other radius of the arc.
  6. Pick the endpoint of the arc.
  7. The arc of ellipse is created, including a set of internal geometry (major axis, minor axis and two foci).
  8. Optionally deleted one or more elements of the internal geometry. They can be recreated at any time with Sketcher RestoreInternalAlignmentGeometry.

Peculiarities

  • 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.