How to edit colors for the line?

Question

Yingyi Huang 2020-8-5

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https://ww2.mathworks.cn/matlabcentral/answers/575794-how-to-edit-colors-for-the-line

评论： Yingyi Huang 2020-8-6

采纳的回答： Walter Roberson

The legend line corlor is wrong. How do I change the black to green for the measured one?

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Answer 1

Walter Roberson 2020-8-5

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https://ww2.mathworks.cn/matlabcentral/answers/575794-how-to-edit-colors-for-the-line#answer_475735

在 MATLAB Online 中打开

We do not know exactly what PlotCone does, but we can predict from the observed behavior that it is creating more than one line() object when it is invoked.

If it can return the line handles, then use

h1 = PlotCone([2000,100,780,50,'k');
h2 = PlotCone(height, Thickness, InnerTopDia, InnerBotDia, [0 0.6 0]);
legend([h1(1), h2(1)], {'Spec', 'Measure'});

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Walter Roberson 2020-8-6

在 MATLAB Online 中打开

ax = gca;
ch0 = get(ax,'Children');
PlotCone(2000,100,780,50,'black');
ch1 = get(ax,'Children');
hold(ax, 'on');
PlotCone(1916,90.6,796.7,88.8,[0 0.6 0]);
ch2 = get(ax, 'Children')
hold(ax, 'off');
pc1_obj = setdiff(ch1, ch0);
pc2_obj = setdiff(ch2, ch1);
pc1_line = findobj(pc1_obj, 'type', 'line');
if isempty(pc1_line)
    pc1_line = pc1_obj(1);
else
    pc1_line = pc1_line(1);
end
pc2_line = findobj(pc2_obj, 'type', 'line');
if isempty(pc2_line)
    pc2_line = pc2_obj(1);
else
    pc2_line = pc2_line(1);
end
legend([pc1_line, pc2_line], {'Spec','Measure'})

Because we as outside observers who do not have access to the source code for PlotCone even though we asked for it, do not know what kind of objects PlotCone generates, we have to take the set difference between the axes objects before and after the PlotCone call, to isolate the objects created by PlotCone. Then we have to try to find a line object among that in order to have something to hang the legend on. If we are unable to find a line object, we return the first of the objects that we did find.

Yingyi Huang 2020-8-6