Sketcher: Arco di ellisse
Arco di ellisse |
Posizione nel menu |
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Sketch → Geometrie → Crea un arco di ellisse |
Ambiente |
Sketcher, Part Design |
Avvio veloce |
Nessuno |
Introdotto nella versione |
- |
Vedere anche |
Ellisse, Arco |
Descrizione
Questo strumento disegna un arco di ellisse selezionando quattro punti: il centro, la fine del raggio maggiore, il punto iniziale e il punto finale dell'arco. Quando si avvia lo strumento, il puntatore del mouse si trasforma in una croce bianca con un'icona a forma di ellisse rossa. Le coordinate sono indicate in tempo reale.
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