MATLAB: Plot MarkerSize units normalized

markersizenormalizedplotunits

Hello! I need to plot a lot of circle of a precise size every small time-step. I was using a for with plot rcos-rsin, but it was very slow. Then I tried scatter that was very faster, but finally I used plot with 'o' parameter and MarkerSize set, that is absolutely the fastest solution. The only problem I have is the size of the marker, that never matches with what I suppose to. I tried changing 'units' to 'normalized' to both gca and gcf, but it doesn't seem to affect the MarkerSize option.

So, how do I get MarkerSize proportional to axes? Thank you.

Best Answer

Sorry, the MarkerSize is always in points.

curunits = get(gca, 'Units');
set(gca, 'Units', 'Points');
cursize = get(gca, 'Position');
set(gca, 'Units', curunits);

Now cursize(3) is the width in points and cursize(4) is the height in points. You can then calculate an appropriate marker size as a fraction of the axes size. If you want to catch changes in the axes size, hook into the figure ResizeFcn callback.

Related Solutions

MATLAB: How is the MarkerSize of a ‘Circle’ marker defined

The circle marker size appears to be the number of points in the diameter. For the other markers, it is not so clear. You can create a square axis with x and y limits of -1 to 1 that is scale inches high and wide

scale = 4;
set(gca, 'Units', 'Inches')
set(gca, 'Position', scale*[0.25, 0.25, 1, 1])
set(gca, 'YTickLabel', [])
set(gca, 'XTickLabel', [])
axis([-1, 1, -1, 1])
axis square
box on
hold on

and then plot all the symbols to be scale*72 units big. I chose 72 since there are 72 points in an inch.

plot(0 , 0, '.', 'MarkerSize', scale*72);
plot(0 , 0, 'o', 'MarkerSize', scale*72);
plot(0 , 0, 'x', 'MarkerSize', scale*72);
plot(0 , 0, '+', 'MarkerSize', scale*72);
plot(0 , 0, '*', 'MarkerSize', scale*72);
plot(0 , 0, 's', 'MarkerSize', scale*72);
plot(0 , 0, 'd', 'MarkerSize', scale*72);
plot(0 , 0, 'v', 'MarkerSize', scale*72);
plot(0 , 0, '^', 'MarkerSize', scale*72);
plot(0 , 0, '<', 'MarkerSize', scale*72);
plot(0 , 0, '>', 'MarkerSize', scale*72);
plot(0 , 0, 'p', 'MarkerSize', scale*72);
plot(0 , 0, 'h', 'MarkerSize', scale*72);

MATLAB: Gets imellipse slower and slower in a loop

Because the axes is getting "full" - not quite sure how else to describe it. Put the command "cla" before the call to imellipse and you'll see the times stay short no matter how many times you call it.

Best Answer

Related Solutions

MATLAB: How is the MarkerSize of a ‘Circle’ marker defined

MATLAB: Gets imellipse slower and slower in a loop

Related Question