Need to create filled circles with a solid border that iterate over each other.

I am designing code that is ment to simulate impacts on a surface. it creates circles that land on top of each other. I would like each craterr to be a filled crater with a hard border such as a a black circle with a blue border so that it covers previous crater borders.

Answer 1

[Voss]

xy = [0 0; 1 1; 2.5 0.5; -2 -1] % crater centers

xy = 4×2

0 0 1.0000 1.0000 2.5000 0.5000 -2.0000 -1.0000

r = [3; 2; 1; 2] % crater radii

r = 4×1

3 2 1 2

% use patch to create the circles:
figure
axis equal
ax = gca();
th = linspace(0,2*pi,100);
for ii = 1:size(xy,1)
    patch(ax,xy(ii,1)+r(ii)*cos(th),xy(ii,2)+r(ii)*sin(th),'k','EdgeColor','b');
end

Answer 2

[Image Analyst]

If you want it as a digital image, see my attached demo. Feel free to adapt it to your needs.