How to make circular colormap surf plot

Question

Joshua Swann 2015-6-29

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/225815-how-to-make-circular-colormap-surf-plot

回答： Chad Greene 2016-5-9

Hello, I'm trying to make either a circular colormap surf plot or draw a circle on a square colormap surf plot. Below is what I've tried with drawing a circle, but only a few points are showing up. Thanks.

Center = 53.0; NaN = 49.8;

X = [-3.5 -2.33, -1.167, 0, 1.167, 2.33, 3.5,... -3.5, -2.33, -1.167, 0, 1.167, 2.33, 3.5,... -3.5, -2.33, -1.167, 0, 1.167, 2.33, 3.5,... -3.5, -2.33, -1.167, 0, 1.167, 2.33, 3.5,... -3.5, -2.33, -1.167, 0, 1.167, 2.33, 3.5,... -3.5, -2.33, -1.167, 0, 1.167, 2.33, 3.5,... -3.5, -2.33, -1.167, 0, 1.167, 2.33, 3.5]; Y = [ 3.5, 3.5, 3.5, 3.5, 3.5, 3.5, 3.5, ... 2.33, 2.33, 2.33, 2.33, 2.33,2.33,2.33,... 1.167, 1.167, 1.167, 1.167, 1.167,1.167,1.167,... 0, 0, 0, 0, 0, 0, 0,... -1.167, -1.167, -1.167, -1.167, -1.167, -1.167, -1.167,... -2.33, -2.33, -2.33, -2.33, -2.33, -2.33, -2.33,... -3.5,-3.5,-3.5,-3.5,-3.5,-3.5,-3.5,]; Z = [NaN,NaN,NaN,51.3,NaN,NaN,NaN,... NaN, 50.5, 51.6, 52.2, 51.7, 51.1,NaN,... NaN,51.4, 52.5, 52.9, 52.4, 51.6,NaN,... 49.8,51.5, 52.5, 53, 52.5, 51.7,49.9,... NaN,51, 52, 52.5, 52.1, 51.1,NaN,... NaN,49.9, 51.2, 51.6, 51.2, 50.3,NaN,... NaN,NaN,NaN,50.0,NaN,NaN,NaN,]/Center;

X = reshape(X,7,7); Y = reshape(Y,7,7); Z = reshape(Z,7,7);

figure;

r = 3.5; % Radius of the sample [cm] ang=0:0.01:2*pi; xp=r*cos(ang); yp=r*sin(ang); h2 = plot(xp,yp, 'c');

hold on

colormap hot h1 = surf(X,Y,Z, 'facecolor','interp', 'edgecolor', 'none'); view(2), colorbar, axis equal tight grid on set(gca,'layer','top', 'tickdir', 'out', 'linewidth', 1.5);

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Answer 1

Mike Garrity 2015-6-30

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https://ww2.mathworks.cn/matlabcentral/answers/225815-how-to-make-circular-colormap-surf-plot#answer_184554

在 MATLAB Online 中打开

The surface has a range of Z values, and the circle is ending up behind it.

If you're using R2014b or later, you can turn off the depth sorting like so:

h1 = surf(X,Y,Z, 'FaceColor','interp', 'EdgeColor', 'none'); 
colormap hot 
hold on
h2 = plot(xp,yp, 'c');
set(gca,'SortMethod','childorder')

I reversed the order of your surf & plot calls so that the plot would draw over the surf.

If you're using an earlier version, your best bet is probably to change the plot to plot3 and add a large Z value. That will move your plot in front of your surf.