Sketcher: Creare Arc de Elipsă

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Sketcher CreateArcOfEllipse

Menu location
Sketch → Sketcher geometries → Create an arc of ellipse
Workbenches
Sketcher
Default shortcut
None
Introduced in version
-
See also
Sketcher Ellipse, Sketcher Arc

Descriere

Acest instrument desenează un arc de elipsă prin alegerea a patru puncte: centrul, sfârșitul semiaxei majore, punctul de început și punctul final. Când porniți instrumentul, indicatorul mouse-ului se modifică într-o cruce albă cu o pictogramă arc de elipsă roșie. Pe lângă acestea, coordonatele sunt afișate în timp real.

The sequence of clicks is indicated by yellow arrows with numbers. C is the center, a - major diameter, b - minor diameter, F1, F2 are foci.

Usage

  • Invoke the command by clicking a toolbar button, picking the menu item, or by using keyboard shortcut (needs to be assigned first in Interface Customization).
  • 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.
  • 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 Internal Alignment Constraint and Sketcher Show Hide Internal Geometry.
  • Pressing ESC or clicking the right mouse button cancels the function.

Peculiarities

  • 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.
  • 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.

Version

Introduced in FreeCAD v0.15.4309