Construction Aid Ellipse Arc > Vector - Vector (Construct Menu)

This command draws a Construction Aid ellipse arc by entering both half-axes of the underlying ellipse independently so that they can be at any angle to each another.

The center point of the ellipse can be entered with the mouse by clicking anywhere in the drawing.

The first point through which the ellipse should run is the end point of the first half axis. It can be entered with the mouse by clicking anywhere in the drawing.

The second point through which the ellipse should run is the end point of the second half axis. It can be entered with the mouse by clicking anywhere in the drawing.

The start angle of the Construction Aid ellipse arc can be entered with the mouse by clicking anywhere in the drawing. The position of this point relative to the center determines the start angle.

The end angle of the Construction Aid ellipse arc can be entered with the mouse by clicking anywhere in the drawing. The position of this point relative to the center determines the end angle.

The appearance of the ellipse arc is determined by the current arc direction setting. This is set using the command Toggle Arc Direction (F2), with the F2 key or the button in the panel. If the arc direction is positive, the ellipse arc is drawn in a mathematically positive (i.e. anti-clockwise) direction from the start angle to the end angle. If the arc direction is negative, the ellipse arc is drawn in a mathematically negative (i.e. clockwise) direction from the start angle to the end angle (see graphic).

The resulting ellipse arc is shown during entry and changes immediately if the current arc direction is changed during entry.

The arc direction settings saved in an ellipse arc are not affected by changing the current arc direction. To change the arc direction of an existing arc, use the command Transform Object to > Invert.