draw_principal_axis# sectionproperties.post.post.draw_principal_axis(ax: Axes, phi: float, cx: float, cy: float) → None[source]# Draws the principal axis on a plot. Parameters: ax (Axes) – Axes object on which to plot phi (float) – Principal axis angle in radians cx (float) – x-location of the centroid cy (float) – y-location of the centroid