MATLAB: Event name listener list for ROI from draw rectangle/freehand/assisted etc

drawlistenerMATLABroi

Hello,

I'm looking for a list of listener I can create for the draw function : https://www.mathworks.com/help/images/roi-creation-overview.html

I'm unable to find it, is there documentation about this or a code to access all the events I can follow ? For the moment I only know 'ROIMoved' but I would like to follow if a ROI is deleted and maybe more depending on the listener available

Thank you

edit : Ok I found a list of events : https://www.mathworks.com/help/images/ref/images.roi.freehand.html#mw_44f0c5ef-63e0-4fe2-a87f-d39e58225dc6

Is there more ?

Best Answer

Hi Aymeric,

Different ROI objects like rectangle, freehand, circle, polyline, etc. supports different events. You can add listeners for the events supported by that specific ROI object. To get list of all the ROI objects please refer this link. To get list of all the events supported by each ROI, navigate to the ‘Events’ section of each of the ROIs.

Hope this helps!

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drawassisted is a simple wrapper around the image.roi.AssistedFreehand object. The function drawassisted really only constructs the ROI object and calls the draw method on the object so the user can begin drawing immediately. The problem with using drawassisted is that you can't set up listeners for the ROI object until after the object has already been drawn. For most events this isn't an issue but, as you observed, you can't set up DrawingStarted and DrawingFinished because the draw interaction will occur before you get the chance.

My suggestion would be to use the formal interface images.roi.AssistedFreehand directly:

https://www.mathworks.com/help/images/ref/images.roi.assistedfreehand.html

Step 1: Construct the ROI object and parent it to the axes

I = imread('peppers.png');
imshow(I);
ax = gca;
drawroi = images.roi.AssistedFreehand('Parent',ax);

Step 2: Set up the listeners

addlistener(drawroi,'DrawingStarted',@(~,~) disp('Drawing Has Started'));
addlistener(drawroi,'DrawingFinished',@(~,~) disp('Drawing Has Finished'));

Step 3: Call draw method to begin interactively drawing the ROI

draw(drawroi);

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You can find a list of all possible fields for a Bloomberg order and their meaning at the following documentation link:

https://www.mathworks.com/help/trading/emsx.createorder.html#bto02x3-1_sep_shared-order

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Best Answer

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