how i can fill a circle with different styles like striped,...?

i have circle with specified raduis and center:

r1=10;

x1=20; y1=30;

i draw it like this:

nd = 50;

angle = 0:2*pi/nd:2*pi;

x0 = x1 + r1 *cos(angle); y0 = y1 + r1 *sin(angle);

figure

plot(x0,y0,'k')

axis equal

i want to fill this circle in striped mode or other styles.

Does anyone know how I can do these things?