circle marker weird filling

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The circle marker is doing something weird. How can I fix this? Is it the edge thing or the order or what? How do I 'smooth' the edges? Is it because it is filled? It doesn't do it when it's not 'filled'? C2 is an RGB colour code.
plot(time,strain,'-o','Color',C2,'LineWidth',lw,'MarkerSize',ms,'MarkerEdgeColor',C2,'MarkerFaceColor',C2);
  3 Comments
Herline van der Spuy
Herline van der Spuy on 26 Oct 2021
Luckily, the figure is scale down a bit. And you can't see the difference on the pdf. So that's okay. But thank you for the help.

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Accepted Answer

Walter Roberson
Walter Roberson on 22 Oct 2021
Linewidth problems. The circle is drawn as a series of straight segments and when the Linewidth is not 1 the ends of the lines extend out in a way that leaves the shape non-circular. The line segments are constant width, not feathered taking into account the line width.
  3 Comments
Kelly Kearney
Kelly Kearney on 22 Oct 2021
You can play around with layering separate line and marker objects to get a more aesthetically pleasing look:
lw = 5;
mksz = 8;
subplot(3,1,1);
plot(1:10, 1:10, '-bo', 'markersize', mksz, 'linewidth', lw, 'markeredgecolor', 'b', 'markerfacecolor', 'r');
% If you want a linewidth around the markers comparable to the line, layer
% edgeless markers of different sizes
subplot(3,1,2);
plot(1:10, 1:10, '-bo', 'markersize', mksz+lw, 'linewidth', lw, 'markeredgecolor', 'none', 'markerfacecolor', 'b');
hold on;
plot(1:10, 1:10, 'o', 'markersize', mksz-lw/2, 'markeredgecolor', 'none', 'markerfacecolor', 'r');
% If you're okay with a thinner marker outline, you can use markers with a
% different line width
subplot(3,1,3);
plot(1:10, 1:10, '-b', 'linewidth', lw);
hold on;
plot(1:10, 1:10, 'o', 'markersize', mksz, 'linewidth', 1, 'markeredgecolor', 'b', 'markerfacecolor', 'r');
(Note: the auto-generated Answers image is pretty low-res... it looks better when run in actual Matlab)

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More Answers (1)

Image Analyst
Image Analyst on 22 Oct 2021
Try a dot
plot(time,strain,'b.-','Color',C2,'LineWidth',lw,'MarkerSize',ms,'MarkerEdgeColor',C2,'MarkerFaceColor',C2);

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