How to update polygon location in standard MATLAB script

Question

Kris Hoffman 2018-11-14

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https://ww2.mathworks.cn/matlabcentral/answers/429933-how-to-update-polygon-location-in-standard-matlab-script

评论： Kris Hoffman 2018-11-16

I'm trying to update the location of a polygon. As it is moved around an image it does a statistical calculation the output of which is then passed to a text box. All in a figure window (with uicontrols). I can't seem to nail down the syntax for 'addlistener' or 'listener' functions. To be honest, I don't know if it is possible via listeners as I get errors saying that listeners are not available for "images.roi.polygon". "Addlistener does not support vector of hg handles" OR "While adding a PostGet listener, property 'Position' in class 'images.roi.Polygon' is not defined to be GetObservable."

When I try to make change the Set/Get Observable property, it says it's read only. In the code below I realize that roipoly may seem redundant.

How to go about this? Thanks!

p = drawpolygon('LineWidth',2,'Color','cyan','Tag','Polygon');
addlistener(p,'Position','PostGet',@(src,ed)));
Bounds = round(p.Position);
ROI = roipoly(T2,Bounds(:,1),Bounds(:,2));

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Answer 1

Walter Roberson 2018-11-15

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https://ww2.mathworks.cn/matlabcentral/answers/429933-how-to-update-polygon-location-in-standard-matlab-script#answer_347186

在 MATLAB Online 中打开

The properties for that object that you can PostGet or PostSet on are

ALimInclude ApplicationData CLimInclude Copyable DefaultPropMap_Internal Description DimensionNames ErrorCallback HandleVisibility Internal NodeChildren NodeParent Parent Serializable SerializableApplicationData SerializableUserData Tag TransformForPrintFcn TransformForPrintFcnImplicitInvoke UserData Visible XLimInclude YLimInclude ZLimInclude

Perhaps you could instead

addlistener(p, 'ROIMoved', YourFunctionHandleHere)