Sketcher CreateArcOfEllipse: Difference between revisions

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{{GuiCommand
{{GuiCommand
|Name=Sketcher CreateArcOfEllipse
|Name=Sketcher CreateArcOfEllipse
|MenuLocation=Sketch → Sketcher geometries → Create an arc of ellipse
|MenuLocation=Sketch → Sketcher geometries → Create arc of ellipse
|Workbenches=[[Sketcher_Workbench|Sketcher]]
|Workbenches=[[Sketcher_Workbench|Sketcher]]
|Shortcut={{KEY|G}} {{KEY|E}} {{KEY|A}}
|Shortcut={{KEY|G}} {{KEY|E}} {{KEY|A}}
|Version=0.15
|Version=0.15
|SeeAlso=[[Sketcher_CreateEllipseByCenter|Sketcher Ellipse by center]], [[Sketcher_CompCreateArc|Sketcher Arc]]
|SeeAlso=[[Sketcher_CreateEllipseByCenter|Sketcher CreateEllipseByCenter]]
}}
}}


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The [[Image:Sketcher_CreateArcOfEllipse.svg|24px]] [[Sketcher_CreateArcOfEllipse|Sketcher CreateArcOfEllipse]] tool creates an arc of ellipse.
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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[[Image:Sketcher_CreateArcOfEllipse_Example.png]]
[[File:Sketcher_ArcOfEllipseExample1.png‎|none|500px]]
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{{Caption|Arc of ellipse (white) with internal geometry (dark yellow)}}
{{Caption|The sequence of clicks is indicated by yellow arrows with numbers.<br/>C is the center, a - major diameter, b - minor diameter, F1, F2 are foci.}}


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

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


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# There are several ways to invoke the tool:
* Press the {{Button|[[File:Sketcher_CreateArcOfEllipse.svg|16px]] [[Sketcher_CreateArcOfEllipse|Create an arc of ellipse]]}} button.
#* Press the {{Button|[[Image:Sketcher_CreateArcOfEllipse.svg|16px]] [[Sketcher_CreateArcOfEllipse|Arc of ellipse by center, radius, endpoints]]}} button.
* 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.
#* Select the {{MenuCommand|Sketcher → Sketcher geometries → [[Image:Sketcher_CreateArcOfEllipse.svg|16px]] Create arc of ellipse}} option from the menu.
* 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_ConstrainInternalAlignment|Internal Alignment Constraint]] and [[Sketcher_RestoreInternalAlignmentGeometry|Sketcher Show Hide Internal Geometry]].
#* Use the keyboard shortcut: {{KEY|G}} then {{KEY|E}}, then {{KEY|A}}.
* Pressing {{KEY|ESC}} or clicking the right mouse button cancels the function.
# The cursor changes to a white cross with the tool icon.
# Pick the center of the arc.
# Pick an endpoint of one of the axes of the arc, this also defines one of its radii.
# 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).
# If the tool runs in [[Sketcher_Workbench#Continue_modes|continue mode]]:
## Optionally keep creating arcs.
## To finish, right-click or press {{KEY|Esc}}, or start another geometry or constraint creation tool.


==Notes== <!--T:17-->
==Peculiarities==


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* Elements of the internal geometry can be deleted. They can be recreated at any time with [[Sketcher_RestoreInternalAlignmentGeometry|Sketcher RestoreInternalAlignmentGeometry]].
* 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 arc of ellipse are strict and cannot be swapped by resizing. This is a consequence of the solver parametrization and the same strict behavior of [[OpenCASCADE|OpenCASCADE]]. An arc of ellipse 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 09:11, 13 April 2024

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 CreateEllipseByCenter

Description

The Sketcher CreateArcOfEllipse tool creates an arc of ellipse.

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

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. 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 arc of 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 arc of ellipse must be rotated to swap its axes.