Legend horizontal orientation doesn't work when extracting icon handles
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Ida
am 21 Dez. 2016
Kommentiert: Ida
am 22 Dez. 2016
Hi! I'm using Matlab 2015b and am trying to make a nice plot with a horizontal legend at the bottom. When I do like below, I get nice results (see figure below).
legendHandle = legend('1st' '2nd' '3rd' '4th' '5th' '6th');
legendHandle.Units = 'centimeters';
legendHandle.Orientation = 'horizontal';
legendHandle.Location = 'southOutside';
However, I want to reduce the legend sample line length, so I take out the handle to the icon objects as well.
[legendHandle,icons,~,~] = legend('1st' '2nd' '3rd' '4th' '5th' '6th');
legendHandle.Units = 'centimeters';
legendHandle.Orientation = 'horizontal';
legendHandle.Location = 'southOutside';
lineSamples = findall(icons,'Type','Line')
for i=1:numel(allSamples)
try
lineSamples(i).XData = [lineSamples(i).XData(1) lineSamples(i).XData(2)*0.5];
end
end
This yields a messed up result however (figure below), where the legends are not horizontal but still vertical but squished together.
Can anyone point me in the right direction how to fix this? Thank you! /Ida
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Massimo Zanetti
am 21 Dez. 2016
As far as I know the syntax [lgd,icons,plots,txt] = legend(..) is not reccomended. Notice in fact that by simply calling icons as output you destroy the legend layout:
%plot 3 random lines
plot(rand(10,3));
[lh,icons,~,~] = legend('1st','2nd','3rd');
lh.Units = 'centimeters';
lh.Orientation = 'horizontal';
lh.Location = 'southOutside';
Therefore, after calling icons you need to replace ALL the objects in the legend. To do so, consider that icons objects of type 'Line' are twice the number of lines (in this case 6)
ls= findall(icons,'Type','Line')
ls =
6×1 Line array:
Line (1st)
Line (1st)
Line (2nd)
Line (2nd)
Line (3rd)
Line (3rd)
For every line that you see in the legend, you have 2 line objects! In parentheses the corresponding item label is reported by Matlab. For each line, the first object associated to it is the line object which is plotted in the legend, while the second one is its central position (inspect both XData and YData of all ls(k) for k=1,...,6). Thus, to make your custom legend, change all the ls lines XData and YData accordingly (for example, YData must be all the same while XData must be properly spaced). Remember, you also have to adjust text objects position.
My suggestion is to set 'Units' to 'normalized'.
Let me know if you need help.
4 Kommentare
Massimo Zanetti
am 22 Dez. 2016
Bearbeitet: Massimo Zanetti
am 22 Dez. 2016
Yes, by now there is no other way than re-adjusting all line and text objects one by one.. :(
However, Matlab indeed does a good job in arranging the objects.. do you really need to change the feel?
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