How to add common legend at the end (Bottom Side) of the whole image

Question

Sumit Saha 2021-5-17

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/832478-how-to-add-common-legend-at-the-end-bottom-side-of-the-whole-image

评论： Lidia Irene Benitez 2022-5-28

采纳的回答： Adam Danz

在 MATLAB Online 中打开

figure (1)

subplot(2,2,1)

plot(rand(3,1),rand(3,1),'b',rand(3,1),rand(3,1),'b',rand(3,1),rand(3,1),'b',rand(3,1),rand(3,1),'b','linewidth', 1)

hold on

hx = xlabel('Maximum Storey Acceleration (in g)', 'Fontsize', 12);

hy = ylabel('Storey Number', 'Fontsize', 12);

title('GM,FN Comp-Rup Dist. 5 km')

axis([0 1.5 0 9])

set(gcf,'position',[ 140 370 850 770])

set(findall(gcf,'-property','Fontsize'),'Fontsize',12)

print('DT300','-dpng','-r300');

subplot(2,2,2)

plot(rand(3,1),rand(3,1),'b',rand(3,1),rand(3,1),'b',rand(3,1),rand(3,1),'b',rand(3,1),rand(3,1),'b','linewidth', 1)

hold on

hx = xlabel('Maximum Storey Acceleration (in g)', 'Fontsize', 12);

hy = ylabel('Storey Number', 'Fontsize', 12);

title('GM,FP Comp-Rup Dist. 5 km')

axis([0 1 0 9])

set(gcf,'position',[ 140 370 850 770])

set(findall(gcf,'-property','Fontsize'),'Fontsize',12)

hold on

subplot(2,2,3)

plot(rand(3,1),rand(3,1),'b',rand(3,1),rand(3,1),'b',rand(3,1),rand(3,1),'b',rand(3,1),rand(3,1),'b','linewidth', 1)

hold on

hx = xlabel('Maximum Storey Acceleration (in g)', 'Fontsize', 12);

hy = ylabel('Storey Number', 'Fontsize', 12);

title('GM,FN Comp-Rup Dist. 15 km')

axis([0 1.5 0 9])

set(gcf,'position',[ 140 370 850 770])

set(findall(gcf,'-property','Fontsize'),'Fontsize',12)

print('DT300','-dpng','-r300');

subplot(2,2,4)

plot(rand(3,1),rand(3,1),'b',rand(3,1),rand(3,1),'b',rand(3,1),rand(3,1),'b',rand(3,1),rand(3,1),'b','linewidth', 1)

hold on

hx = xlabel('Maximum Storey Acceleration (in g)', 'Fontsize', 12);

hy = ylabel('Storey Number', 'Fontsize', 12);

title('GM,FP Comp-Rup Dist. 15 km')

axis([0 1 0 9])

set(gcf,'position',[ 140 370 850 770])

set(findall(gcf,'-property','Fontsize'),'Fontsize',12)

hold on

legh = legend('Station 1','Station 2','Station 3','Station 4','Station 5','Location','southoutside');

Warning: Ignoring extra legend entries.

set(legh, 'fontsize', 12)

% add legend

%Lgnd = legend('show');

%Lgnd.Position(1) = 0.4;

%Lgnd.Position(2) = 0.0;

print('DT300','-dpng','-r300');

How can I insert common legend at the outside (south) of the pic ?

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Sumit Saha 2021-5-17

@Image Analyst Can you please help me with this ?

Adam Danz 2021-5-17

I updated your question to display the result of your code. Note the warning that is produced by supplying 5 labels for 4 objects. Remove the fifth label or add a fifth object to fix that issue.

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Answer 1

Adam Danz 2021-5-17

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/832478-how-to-add-common-legend-at-the-end-bottom-side-of-the-whole-image#answer_701948

Use TiledLayout instead of subplot to create the axes. Then, after adding the legend, position it on the bottom using the tiled layout object.

Example with 2x2 axes

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Answer 2

DGM 2021-5-17

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/832478-how-to-add-common-legend-at-the-end-bottom-side-of-the-whole-image#answer_701953

编辑：DGM 2021-5-17

在 MATLAB Online 中打开

Adam's answer is the elegant solution, but if you're using something older than R2020b, or if you're not using tiledlayout, you can do something like this:

p = get(gca,'position'); % store axes geometry before creating legend
legh = legend('Station 1','Station 2','Station 3','Station 4','Station 5','Location','southoutside');
set(legh, 'fontsize', 12)
set(gca,'position',p) % restore axes geometry
legh.Position(1:2) = [0.5-legh.Position(3)/2 0.02]; % roughly center legend
% shift all the axes up a bit to make room for the legend
offset = 0.05; % vertical offset per row
scale = 0.9; % amount to scale each axes vertically
gh = gcf;
h = gh.Children;
h = flipud(h(isgraphics(h,'axes')));
for ax = 1:numel(h)
	h(ax).Position(2) = h(ax).Position(2) + offset*ceil(ax/2); % assumes 2 columns
	h(ax).Position(4) = h(ax).Position(4) * scale;
end

If you want to make better use of the space, you can reorient the legend:

p = get(gca,'position'); % store axes geometry before creating legend
legh = legend('Station 1','Station 2','Station 3','Station 4','Station 5','Location','southoutside');
set(legh, 'fontsize', 12,'orientation','horizontal')
set(gca,'position',p) % restore axes geometry
legh.Position(1:2) = [0.5-legh.Position(3)/2 0.03]; % roughly center legend
% shift all the axes up a bit to make room for the legend
offset = 0.02; % vertical offset per row
scale = 0.95; % amount to scale each axes vertically
gh = gcf;
h = gh.Children;
h = flipud(h(isgraphics(h,'axes')));
for ax = 1:numel(h)
	h(ax).Position(2) = h(ax).Position(2) + offset*ceil(ax/2);
	h(ax).Position(4) = h(ax).Position(4) * scale;
end