Sketcher CreateEllipseByCenter: Difference between revisions

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The [[Image:Sketcher_CreateEllipseByCenter.svg|24px]] [[Sketcher_CreateEllipseByCenter|Sketcher CreateEllipseByCenter]] tool creates an ellipse by its center, an endpoint of one of its axes, and a point along the ellipse. {{Version|0.22}}: Or optionally by both endpoints of one of its axes and a point along the ellipse.
The [[Image:Sketcher_CreateEllipseByCenter.svg|24px]] [[Sketcher_CreateEllipseByCenter|Sketcher CreateEllipseByCenter]] tool creates an ellipse by its center, an endpoint of one of its axes, and a point along the ellipse. {{Version|0.22}}: Or optionally by both endpoints of one of its axes and a point along the ellipse.

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[[Image:Sketcher_CreateEllipseByCenter_Example.png]]
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{{Caption|Ellipse (white) with internal geometry (dark yellow)}}


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


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


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Pos-OVP = Positional [[Sketcher_Preferences#General|On-View-Parameters]]. {{Version|0.22}}<br>
Pos-OVP = Positional [[Sketcher_Preferences#General|On-View-Parameters]]. {{Version|0.22}}<br>
Dim-OVP = Dimensional On-View-Parameters. {{Version|0.22}}
Dim-OVP = Dimensional On-View-Parameters. {{Version|0.22}}
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# There are several ways to invoke the tool:
# There are several ways to invoke the tool:
#* Press the {{Button|[[Image:Sketcher_CreateEllipseByCenter.svg|16px]] [[Sketcher_CreateEllipseByCenter|Ellipse by center, major radius, point]]}} button.
#* Press the {{Button|[[Image:Sketcher_CreateEllipseByCenter.svg|16px]] [[Sketcher_CreateEllipseByCenter|Ellipse by center, radius, rim point]]}} button.
#* Select the {{MenuCommand|Sketcher → Sketcher geometries → [[Image:Sketcher_CreateEllipseByCenter.svg|16px]] Create Ellipse by center}} option from the menu.
#* Select the {{MenuCommand|Sketcher → Sketcher geometries → [[Image:Sketcher_CreateEllipseByCenter.svg|16px]] Create ellipse by center}} option from the menu.
#* Use the keyboard shortcut: {{KEY|G}} then {{KEY|E}}, then {{KEY|E}}.
#* Use the keyboard shortcut: {{KEY|G}} then {{KEY|E}}, then {{KEY|E}}.
# The cursor changes to a white cross with the current tool mode icon.
# The cursor changes to a cross with the current tool mode icon.
# The '''Ellipse parameters''' section ({{Version|0.22}}) is added at the top of the [[Sketcher_Dialog|Sketcher Dialog]].
# The '''Ellipse parameters''' section ({{Version|0.22}}) is added at the top of the [[Sketcher_Dialog|Sketcher Dialog]].
# Optionally press the {{KEY|M}} key or select from the dropdown list in the parameters section to change the tool mode:
# Optionally press the {{KEY|M}} key or select from the dropdown list in the parameters section to change the tool mode:
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#*# Pick the center of the ellipse. Or with Pos-OVP: enter its X and/or Y coordinate.
#*# Pick the center of the ellipse. Or with Pos-OVP: enter its X and/or Y coordinate.
#*# 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.
#*# 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.
#*# Pick a point to define the other radius of the ellipse. Or with Dim-OVP: enter this second radius.
#*# Pick a point to define the other radius of the ellipse. Or with Dim-OVP: enter this radius.
#* [[Image:Sketcher_CreateEllipseBy3Points.svg|16px]] '''Axis endpoints and radius''': {{Version|0.22}}
#* [[Image:Sketcher_CreateEllipseBy3Points.svg|16px]] '''Axis endpoints''': {{Version|0.22}}
#*# 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.
#*# 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.
#*# 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.
#*# 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.
# 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.
# 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.
# If the tool runs in [[Sketcher_Workbench#Continue_modes|continue mode]]:
# Optionally deleted one or more elements of the internal geometry. They can be recreated at any time with [[Sketcher_RestoreInternalAlignmentGeometry|Sketcher RestoreInternalAlignmentGeometry]].
## Optionally keep creating ellipses.
## To finish, right-click or press {{KEY|Esc}}, or start another geometry or constraint creation tool.


==Peculiarities== <!--T:15-->
==Notes== <!--T:19-->


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* Elements of the internal geometry can be deleted. They can be recreated at any time with [[Sketcher_RestoreInternalAlignmentGeometry|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.
* 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|OpenCASCADE]]. An ellipse must be rotated to swap its axes.
* An ellipse can function as a circle if its axes are deleted, and one of its foci is constrained to coincide with its center. But a radius constraint won't work on such a circle.





Revision as of 09:24, 18 April 2024

Sketcher CreateEllipseByCenter

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

Description

The Sketcher CreateEllipseByCenter tool creates an ellipse by its center, an endpoint of one of its axes, and a point along the ellipse. introduced in version 0.22: 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. introduced in version 0.22
Dim-OVP = Dimensional On-View-Parameters. introduced in version 0.22

  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 (introduced in version 0.22) 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: introduced in version 0.22
      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.