MATLAB: Text out on axes

axesguitext;

I load an image onto an axes and want to display text in the top left hand corner. As I often display the image at different zoom factors, using the text using x,y wont work for all Zoom factors. Is there away to say irrespective of zoom, always plot at a certain coordinate on the underlying axes?

Best Answer

Yes, text has a 'Units' property. If you set this to one of the "screen space" units (I just made that term up), then it is relative to the lower-left corner of the axes.

For example:

text(2*72, 1*72, 'My String', 'Units', 'points')

Will create a text string which stays 2 inches in from the left and 1 inch up from the right (a point is 1/72 inch), even when you pan or zoom.

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MATLAB: Make a figure a parent of text

Or define an axes, which has the same size as the figure and is invisible:

AxesH = axes('Units', 'normalized', 'Position', [0,0,1,1], 'visible', 'off', ...
    'YLimMode', 'manual', 'YLim',  [0, 1], ...
    'XTick',    [],       'YTick', [], ...
    'NextPlot', 'add', ...
    'HitTest',  'off');
text(10, 10, 'Hello', 'Units', 'pixels', 'VerticalAlignment', 'bottom', ...
     'Parent', AxesH);

MATLAB: What’s the diameter of the standard circle marker ‘o’ in scatter3 plot

The size of scatter objects are in point units where 1 point equals 1/72 inch.

Plot a single point and look at it's SizeData.

h = scatter3(0,0,0); 
h.SizeData
% ans =
%     36

so, the default size is 36/72 or 1/2 inch.

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MATLAB: Make a figure a parent of text

MATLAB: What’s the diameter of the standard circle marker ‘o’ in scatter3 plot

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