Circular grating stimuli and wavy lines stimuli


Completely new to this so any help would be very much appreciated.

Is there any way to create circular gratings (ie that will resemble concentric circles) and gratings that are wavy lines (ie sine) rather than straight lines? I would want to be able to alter the spatial frequency of both as well as the orientation of the wavy lines…

Many thanks.

Examples of what I’m trying to achieve: