Rescale tick marks on UIAxes

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Steven Manz
Steven Manz 2022-8-31
评论： Steven Manz 2022-8-31
I have a figure that represents a grayscale image. Its resolution is 1280x960. If I show the axes, this is what it shows. When I zoom in, I get the proper vector scaled axis tick marks.
I want to change the tick marks to be distance rather than resolution. I have created my own internal function that will determine pixel distance related to the scale given on the image.
For this note that:
pixel_distance = 0.1;
The image is attached. Here is the code I use to generate tick marks:
xlen = rescale(get(app.UIAxes,'xtick'),0,size(image,2)*pixel_distance);
ylen = rescale(get(app.UIAxes,'ytick'),0,size(image,1)*pixel_distance);
xt=arrayfun(@num2str,xlen,'un',0);
yt=arrayfun(@num2str,ylen,'un',0);
set(app.UIAxes,'xticklabel',xt,'yticklabel',yt)
set(app.UIAxes,'xtick',xlen,'ytick',ylen)
But this gives the wrong output:
If I just use this code:
xlen = rescale(get(app.UIAxes,'xtick'),0,size(image,2)*pixel_distance);
ylen = rescale(get(app.UIAxes,'ytick'),0,size(image,1)*pixel_distance);
xt=arrayfun(@num2str,xlen,'un',0);
yt=arrayfun(@num2str,ylen,'un',0);
set(app.UIAxes,'xticklabel',xt,'yticklabel',yt)
I am only setting the label string values but not the physical quantities. So when I scroll in the tick marks do not change as they should.
_______________
Does somebody know how I can correctly fix the scaling on the tick marks to represent distance rather than resolution?

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采纳的回答

Image Analyst
Image Analyst 2022-8-31
Try passing in XData and YData as options into imshow
  2 个评论
Steven Manz
Steven Manz 2022-8-31
I just noticed that I forgot to include the image. It is included now. Sorry.
Steven Manz
Steven Manz 2022-8-31
Such a simple answer! Thank you so much. Here is the code I am now using. Instead of changing the axis on the backend like I was before. I am just doing it on the front end and using 'XData' and 'YData' to control the information.
function tick_update(app, image)
% Read in image
I = imread(image);
% Rescale
I = I(:,:,1);
% Determine pixel distance to properly scale everything
pixel_distance = find_numbers_and_spaces(I, app.ScalingEditField.Value);
% Tick Marks
xlen = size(image,2)*pixel_distance;
ylen = size(image,1)*pixel_distance;
% Create image
imshow(app.database.current_image,'Parent',app.UIAxes, 'XData',[0 xlen], 'YData', [0 ylen]);
end
Thanks again!

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