Rescale tick marks on UIAxes

Question

Steven Manz 2022-8-31

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1791550-rescale-tick-marks-on-uiaxes

评论： Steven Manz 2022-8-31

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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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Answer 1

Image Analyst 2022-8-31

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1791550-rescale-tick-marks-on-uiaxes#answer_1038610

Try passing in XData and YData as options into imshow

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Steven Manz 2022-8-31

I just noticed that I forgot to include the image. It is included now. Sorry.

Steven Manz 2022-8-31

在 MATLAB Online 中打开

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