Probing a plot based on colormap information

15 次查看（过去 30 天）

Pelajar UM 2022-3-10

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1668179-probing-a-plot-based-on-colormap-information

评论： Pelajar UM 2022-3-11

How can I probe a plot with colormap data?

As you see, in this case, it only shows the xyz coordinates which is not really useful. I want to be able to see the colormap value (between 0 and 1).

Any ideas? I am using the trisurf function.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Simon Chan 2022-3-11

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1668179-probing-a-plot-based-on-colormap-information#answer_914944

Try function datatip & dataTipTextRow if your MATLAB version is after 2019b.

[x,y] = meshgrid(1:15,1:15);

z = peaks(15);

T = delaunay(x,y);

s = trisurf(T,x,y,z);

dt = datatip(s);

s.DataTipTemplate.DataTipRows(end+1) = dataTipTextRow('Colormap Value',T,'%.1f');

9 个评论
显示 7更早的评论隐藏 7更早的评论

Simon Chan 2022-3-11

Add another line :-)

s.DataTipTemplate.DataTipRows(end+1) = dataTipTextRow('Colormap Value',repmat(s.CData,1,3),'%.3f');
s.DataTipTemplate.DataTipRows(1:3)=[];      % Add this line as well
delete(dt);

Pelajar UM 2022-3-11

Looks great now. Thank you again!

请先登录，再进行评论。

更多回答（1 个）

KSSV 2022-3-10

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1668179-probing-a-plot-based-on-colormap-information#answer_914324

I don't think you would be able to see the values like that. But you can see what value it has using:

F = scatteredInterpolant(x,y,z,c) ;
ci = F(xi,yi,zi) ;  % where xi, yi, zi is the picked point 

5 个评论
显示 3更早的评论隐藏 3更早的评论

Simon Chan 2022-3-10

Choose figure object

f = figure;

ax = gca;

d = datacursormode(f)

d =

DataCursorManager with properties: SnapToDataVertex: on DisplayStyle: 'datatip' DefaultExportVarName: 'cursor_info' Interpreter: 'tex' UpdateFcn: [] Enable: off Figure: [1×1 Figure]

d2 = datacursormode(ax)

Error using datacursormode (line 154)
Invalid figure handle

Pelajar UM 2022-3-10

Thanks, but how do you get the figure object of an UIAxes in app designer?

trisurf(F,P(:,1),P(:,2),P(:,3), flow12, 'Parent', app.UIAxes2_10);
            c = colorbar(app.UIAxes2_10);
            caxis(app.UIAxes2_10,[0.333 1]);
            colormap(app.UIAxes2_10, jet);
            c.Label.String = 'T11 Tensor';

On another note, there seems to be a way to modify the data tip function, but I don't really know how to implement customized functions in app designer:

https://www.mathworks.com/matlabcentral/answers/339066-how-to-data-cursor-displaying-colorbar-value

请先登录，再进行评论。

请先登录，再回答此问题。