How to make a circle MarkerSize on a plot equal to a specific diameter relative to the scale being used
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I have a question about using MarkerSize for 'Marker' = 'o' using the plot function
MarkerSize is given in points. I would like to set the diameter of the Marker 'o'
Is there a conversion to obtain a numerical value given by the scale you're using.
For example, on a degrees plot: plot(A, B, 'Marker', 'o', 'MarkerSize', .75)
where A and B are in degrees.
I would like the diameter to equal .75 degrees. Thanks for your help !
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Walter Roberson
2011-8-31
It could be done in theory, through a multistep process involving finding the plotting area of the axes in units in points, and relating that to the xlim or ylim to determine the proper ratio.
Finding the actual plotting area inside the box limits is tricky in my experience; I'm not sure I have ever managed to do it.
This is a case where scatter() does not help; I generally turn to scatter() when point plotting via plot() is not sufficiently flexible, but scatter() uses points for its marker size as well.
Hmmm... you could probably rectangle() circles in places at the appropriate locations (the rectangle() routine can draw circles.)
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Nando Trindade
2011-9-1
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Walter Roberson
2011-9-1
arrayfun() the loop for simplicity. Something like,
w = 1.5;
arrayfun(@(x,y) rectangle('Position', [x-w/2, y-w/2, w, w], 'Curvature', [1 1], 'EdgeColor', 'r', 'FaceColor', 'r'), X, Y);
Different sizes for each would be a small modification:
arrayfun(@(x,y,w) rectangle('Position', [x-w/2, y-w/2, w, w], 'Curvature', [1 1], 'EdgeColor', 'r', 'FaceColor', 'r'), X, Y, W);
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