Assigning a line plot object to a global property doesn't retain it after the object is deleted
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Is there a reason why when I delete a plot of a multiplot graph and assign it to a global (public) property it doesn't retain it.
ax=app.UIAxes; % My plot is on a UIAxes
t = ax.Children(1) % Get the last plot
app.myPlot=t % myPlot is a Global property
delete(t);
app.myPlot
app.myPlot shows:
ans =
handle to deleted Line
so instead I have to access all the properties of the line individually and assign to a struct.
s = struct;
s.X=t.XData;
s.Y=t.YData;
s.Cl=t.Color;
s.DN=t.DisplayName;
s.Ls=t.LineStyle;
s.Lw=t.LineWidth
s.M=t.Marker;
app.myPlot=s;
Just seems more clunky!
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Steven Lord
il 14 Giu 2024
All of the handles to the line object (which is a handle object) are references to the same thing on the screen. If you delete() the handle, you delete the thing on the screen. Trying to access it after it's been deleted would be like throwing away a piece of paper but hoping to be able to feel it using a picture you took on your phone. That's not going to work. A very few things do still work; asking for its class or asking if it isvalid would. But the line is gone; asking for its XData or YData won't work.
What were you hoping to have happen by deleting the line on the screen but then trying to reference it?
6 Commenti
Steven Lord
il 14 Giu 2024
You can control what gets displayed in the legend by passing a vector of handles into legend.
x = 0:360;
axis([0 360 -1 1])
hold on
s = plot(x, sind(x), '-', DisplayName = "sine");
c = plot(x, cosd(x), ':', DisplayName = "cosine");
legend(s) % Show only the sine curve in the legend
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