contourf without isoline but with label

Question

roudan 2021-7-16

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/880113-contourf-without-isoline-but-with-label

评论： dpb 2021-7-16

采纳的回答： DGM

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Hi

below code from below question to remove the isoline. But I'd like to keep label with it. How to do it?

https://www.mathworks.com/matlabcentral/answers/28887-contourf-with-no-isoline

[C,h] = contourf(peaks(20),10);
set(h,'LineColor','none')

I do have below code, but once I used set(h,'LineColor','none'), the below code does't work anymore.

clabel(ct,hct,'FontWeight','bold','FontSize',contourlinefontsize_right,'Color','k');

ok, here is the whole code you can exerciese:

Z = peaks ;

[c,h]=contourf(Z); hold on ;

set(h,'LineColor','none')

h.LineWidth = 0.001;

clabel(c,h,'FontWeight','bold','FontSize',10,'Color','k');

Thanks

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Answer 1

DGM 2021-7-16

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Set linecolor to 'flat'

[C,h] = contourf(peaks(20),10);

set(h,'LineColor','flat')

clabel(C,h,'FontWeight','bold','FontSize',5,'Color','k');

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roudan 2021-7-16

oh, my goodness, Mr DGM. you saved my day. I have been googling and trying for 3 hours and never succeed. Now you can just solve it. That is the beautty of knowledge and expertise. Thank you DGM. I really appreciate it!

dpb 2021-7-16

Huh. That's the one option I never thought of as having any effect...good catch! Certainly much easier than the alternative...

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Answer 2

dpb 2021-7-16

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This one is nearly intractable -- the underlying text handles are tied to the color of the line, although one could set their color independently by use of the CData property for each.

BUT, the kicker is, internally, the handles to those text objects comes and goes depending upon whether the 'LineStyle' or 'LineColor' property are set -- if either of those is set to 'none' to hide the lines, then the text objects themselves disappear entirely, they aren't just hidden.

So (and I didn't have time just now to try to do it), the only way I see to go at it would be to

create the plot; save the handle to the contour object [~,hC]=contourf(...);
make sure lines/contour levels are showing
save array of text object handles from undocumented TextPrims property -- hTxt=hC.TextPrims;
retrieve all the poop about each -- including 'VertexData', 'Rotation', 'String', etc., etc., ...
turn off 'LineStyle' by hC.LineStyle='none';
now redraw all the text objects from the data saved in step 4) above.

Without such machinations, the next best thing to no line might be

h.LineStyle=':';

to used the dotted line as subtly as possible. Unfortunately, HG internals is such that even 'LineWidth' of eps is still rendered as if were 0.5 and identically zero isn't allowed (and if were, the above behavior of deleting the text objects would also probably happen, anyways).