### 2.13 Elliptical arc

To draw an arc of an ellipse defined with three points B, A, C (defining an oriented angle), two radius rx, ry and a direction.

• Shortcut: Alt+Maj+A
• We give a name.
• We enter a commad like [B, A, C, rx, ry]: A is the center’s affix, the starting point of the arc is on the half-line $\left[AB\right)$, the last point on the half-line $\left[A,C\right)$. the boolean “counterclockwise” is used to set the turning direction.
• If the coordinate system is not orthonormal, the arc will be deformed. The system is orthonormal as soon as the variable Xscale and Yscale are equal: see option Preferences/window in the menu. To get a non deformed arc in a non orthonormal system, use the macro : RellipticArc().
• Arrows can be set at the ends of an arc.
• Corresponding graphical command: EllipticArc (to be used in a User-defined type element).