MATLAB: How to change the font of a block name and/or signal line name in Simulink

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I would like to change the font of all my blocks and all my signal line names in my Simulink model. Is this possible and if so how can I do this programatically (i.e. from the command line)? Furthermore, is there a way to change the default font for blocks, signal lines and/or annotations when creating a new model?

Best Answer

There are several ways to change the font of a block name and signal line name. Please go over the following methods and choose the one that best fits your needs while using 'tsModel.mdl' as an example model:
BLOCK NAME
Block-by-block:
Right-click on the desired blocks and navigate to 'Format' -> 'Font...' to change the font.
Command Line:
myModel = 'tsModel';
open_system(myModel)
sl_handle = get_param(myModel,'handle');
blocks = [find_system(sl_handle, 'LookUnderMasks', 'on'); ...
         find_system(sl_handle, 'FindAll', 'on', 'Type', 'annotation')];
for i = 2:length(blocks)
       set_param(blocks(i),'FontSize','14')
end
% For a full list of what block parameters can be changed
get_param(blocks(2),'ObjectParameters')
SIGNAL LINE NAME
Line-by-line:
Starting in Simulink 8.0 (R2012b) one can right-click on the desired signal line and navigate to 'Format' -> 'Font Style...' to change the font.
Command Line:
myModel = 'tsModel';
open_system(myModel);
lines = get_param(myModel,'Lines'); 
for i = 1:length(lines) 
      set_param(lines(i).Handle,'FontSize','14') 
end 
% For a full list of what line parameters can be changed
get_param(lines(1).Handle,'ObjectParameters')
FONT DEFAULT FOR NEW MODELS
In a model, please navigate to 'File' -> 'Preferences...' -> 'Simulink Preferences' -> 'Font Defaults for New Models.' Here one can set the default font that new models will inherit.
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