Interactive rectangle on UIAxes for user to choose a region

Question

Biraj Khanal 2022-5-27

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1728335-interactive-rectangle-on-uiaxes-for-user-to-choose-a-region

评论： Walter Roberson 2022-6-10

I have a dataset with scattered points that I plot on a UIAxes. The idea is to let the user draw a rectangle over the UI Axes only ( not the whole figure) and select a region so that it can be processed further.

plot(app.UIAxes,app.data(1,:),app.data(2,:),'k*');
disableDefaultInteractivity(app.UIAxes); 
f = app.UIFigure;
f.Units = 'normalized';
waitforbuttonpress
pos = rbbox; 
annotation('rectangle',pos,'Color','r');

The code above is what I tried. The first problem that i see is that waitforbuttonpress opens a new figure and does not operate on the app figure or the axes. What should be the way to get this working?

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Answer 1

Walter Roberson 2022-5-27

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https://ww2.mathworks.cn/matlabcentral/answers/1728335-interactive-rectangle-on-uiaxes-for-user-to-choose-a-region#answer_972655

编辑：Walter Roberson 2022-5-30

https://www.mathworks.com/help/images/ref/drawrectangle.html and make sure to pass in the uiaxes

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Walter Roberson 2022-6-10

The code you are replacing has

waitforbuttonpress

pos = rbbox;

rbbox() does not offer any way to move the initial coordinates of the box: it always uses the Current Point as the starting point. The waitforbuttonpress is there to give the user an opportunity to move the cursor to where they want to start the box, and then click, after which rbbox can then work.

When using App Designer, waitforbuttonpress() is not recommended. Instead, you would set the WindowButtonDownFcn callback for the uifigure that contains the area you want to draw into. The uiresume() callback you have should be fine.

However... rbbox and other similar calls outside of Image Processing Toolbox only work on traditional figures, and all of the recommendations that I can find for how to proceed lead back to drawrectangle() .

In order to proceed without the toolbox, you will need to program your own box dragging function. You might find it useful to look at https://www.mathworks.com/matlabcentral/answers/458264-using-windowbuttondownfcn-in-app-designer#comment_2132605

Walter Roberson 2022-6-10

在 MATLAB Online 中打开

I just successfully tested this code:

fig.WindowButtonDownFcn = @(src,event)uiresume(src);
uiwait(fig);
out = uirbbox(fig);
disp(out)

Where uirbbox is a modified version of Mathwork's rrbox that expects a uifigure as the first parameter.

function finalRect = uirbbox(f, initialRectangle, anchorPoint, step)

and

arguments
    f (1, 1) matlab.ui.Figure

and

for the chain of if nargin == add 1 to each of the counts, so like

if nargin == 1
    initRect = [];
    fixedPoint = [];
    stepSize = [];

Then comment out

f = gcf;

With f now being a parameter that is a uifigure, and with the gcf commented out, and with the argument count incremented by 1 as appropriate... then it works.

... It does, however, take remarkably long to activate.

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