How do you fill a given geometry with the zig-zag lines or spiral lines ?

I wanted to know how do you automatically fill the given geometries with zigzag or spiral contours for the entire region??(You can actually consider a square or rectangle or a circle or any arbitrary shape)

Answer 1

[KSSV]

doc patch, fill

t = linspace(0,2*pi) ;
x = sin(t) ;
patch(t,x,'r')