Hi @Thomas, MATLAB doesn’t currently support a built-in way to position annotation('textbox', ...) elements using the same logic as legends (e.g., 'northwest', 'southeast', etc.), and there’s no auto-alignment or margin-matching feature either. However, you can get pretty close by manually calculating the position relative to the axis and legend objects.
Here's one approach that replicates the spacing of the legend and also allows the textbox to autosize to its content:
x = linspace(0,2*pi,1000);
y = sin(x-2);
plot(x, y);
grid on;
ax = gca;
lgd = legend('y = sin(x - 2)');
% Create an annotation textbox with autosizing
an = annotation('textbox', [.1 .1 .1 .1], ...
'String', 'Info Box', ...
'FitBoxToText', 'on', ...
'BackgroundColor', 'white');
% Compute position to match spacing like the legend
newx = ax.InnerPosition(1) + ax.InnerPosition(3) ...
- (lgd.Position(1) + lgd.Position(3)) + ax.InnerPosition(1);
newy = lgd.Position(2) + lgd.Position(4) - an.Position(4);
% Update textbox position
an.Position = [newx, newy, an.Position(3), an.Position(4)];
This uses FitBoxToText = 'on' to autosize the textbox and places it relative to the legend so the white space/margin looks similar. If the figure is resized, though, you’ll need to re-calculate the position again—there’s no built-in dynamic tracking between the annotation and legend.
Hope this helps!
