Locking the Legend even if the object is deleted
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Ruben Kopischke il 7 Feb 2023
I want the AutoUpdate of my legend to be "off" no matter whether I delete an object from the axes, but:
(since R2022b): If you delete an object from the axes, the legend updates to reflect the change regardless of whether this property (AutoUpdate) is set to "on" or "off".
I have programmed a simulation where the legend of the axes should stay as it is, no matter which objects you delete in the plot. Do you have any idea how I can implement this in newer versions of Matlab?
Benjamin Kraus il 7 Feb 2023
Modificato: Benjamin Kraus il 7 Feb 2023
As @Bjorn Gustavsson suggests, your best bet is to create proxy objects that are represented in the legend, but are not visible in the axes. @Bjorn Gustavsson says to place them "outside the visible area", but my recommendation is to use NaN data so they are not visible. For example:
% Objects with real data.
p = plot(magic(5));
% Create proxy objects with NaN data, which will now be rendered, but can
% be put into the legend.
pLegend = plot(NaN(5)); % Proxy objects with NaN data.
% Copy the SeriesIndex from the objects with real data to the proxy
% objects, which will make the colors and line styles match.
% Use the proxy objects in the legend.
% Now you can delete the real objects, but the proxy object will remain in the legend.
Più risposte (1)
Bjorn Gustavsson il 7 Feb 2023
If you explicitly set the axis of the plot, then you can hide objects outside the visible are and use their handles for the legend. That way it doesn't matter what objects are still "alive" in your active plot. This is a fairly cludgy way to get around this, but I've found it useful to explain the meaning of different line-widths, line-styles when they display different properties across all lines.