How can I draw interactively a polygon on axes in App designer ?

Hello,

I am making an app on App designer and I need to be able to draw interactively a polygon on an image display on an axes.

I already tried imploy, roipoly and drawpolygon functions with 'app.UIAxes' as 'ax' parameter but none of them seem to be accepted by App designer.

Can someone help me ?

Thanks,

Anatole Jimenez

[Matt J]

Please show us (copy/paste) the error messages that you got.

[Anatole Jimenez]

Here is the error for the following instruction :

function mask = drawplaque(app)
            h2 = impoly(app.UIAxes);
            mask = h2.createMask;
end

The error (quite long) :

Error using matlab.ui.control.UIAxes/get
There is no CurrentPoint property on the UIAxes class.

Error in getCurrentPoint (line 10)
p = get(h,'CurrentPoint');

Error in impoly>impolyAPI/animateLine (line 577)
		[x_init,y_init] = getCurrentPoint(h_axes);

Error in iptaddcallback/callbackProcessor (line 149)
                    fun(varargin{:});
 
Error using matlab.ui.internal.controller.FigureController/handleEvent (line 300)
Error while evaluating Figure WindowButtonMotionFcn.

Error using matlab.ui.control.UIAxes/get
There is no CurrentPoint property on the UIAxes class.

Error in getCurrentPoint (line 10)
p = get(h,'CurrentPoint');

Error in impoly>impolyAPI/animateLine (line 577)
		[x_init,y_init] = getCurrentPoint(h_axes);

Error in iptaddcallback/callbackProcessor (line 149)
                    fun(varargin{:});
 
Error using matlab.ui.internal.controller.FigureController/handleEvent (line 300)
Error while evaluating Figure WindowButtonMotionFcn.

Error using matlab.ui.control.UIAxes/get
There is no CurrentPoint property on the UIAxes class.

Error in getCurrentPoint (line 10)
p = get(h,'CurrentPoint');

Error in impoly>impolyAPI/animateLine (line 577)
		[x_init,y_init] = getCurrentPoint(h_axes);

Error in iptaddcallback/callbackProcessor (line 149)
                    fun(varargin{:});
 
Error using matlab.ui.internal.controller.FigureController/handleEvent (line 300)
Error while evaluating Figure WindowButtonMotionFcn.

Error using matlab.ui.control.UIAxes/get
There is no CurrentPoint property on the UIAxes class.

Error in getCurrentPoint (line 10)
p = get(h,'CurrentPoint');

Error in impoly>impolyAPI/animateLine (line 577)
		[x_init,y_init] = getCurrentPoint(h_axes);

Error in iptaddcallback/callbackProcessor (line 149)
                    fun(varargin{:});
 
Error using matlab.ui.internal.controller.FigureController/handleEvent (line 300)
Error while evaluating Figure WindowButtonMotionFcn.

Error using matlab.ui.control.UIAxes/get
There is no CurrentPoint property on the UIAxes class.

Error in getCurrentPoint (line 10)
p = get(h,'CurrentPoint');

Error in impoly>impolyAPI/animateLine (line 577)
		[x_init,y_init] = getCurrentPoint(h_axes);

Error in iptaddcallback/callbackProcessor (line 149)
                    fun(varargin{:});
 
Error using matlab.ui.internal.controller.FigureController/handleEvent (line 300)
Error while evaluating Figure WindowButtonMotionFcn.

Error using matlab.ui.control.UIAxes/get
There is no CurrentPoint property on the UIAxes class.

Error in getCurrentPoint (line 10)
p = get(h,'CurrentPoint');

Error in impoly>impolyAPI/animateLine (line 577)
		[x_init,y_init] = getCurrentPoint(h_axes);

Error in iptaddcallback/callbackProcessor (line 149)
                    fun(varargin{:});
 
Error using matlab.ui.internal.controller.FigureController/handleEvent (line 300)
Error while evaluating Figure WindowButtonMotionFcn.

Error using matlab.ui.control.UIAxes/get
There is no CurrentPoint property on the UIAxes class.

Error in getCurrentPoint (line 10)
p = get(h,'CurrentPoint');

Error in impoly>impolyAPI/animateLine (line 577)
		[x_init,y_init] = getCurrentPoint(h_axes);

Error in iptaddcallback/callbackProcessor (line 149)
                    fun(varargin{:});
 
Error using matlab.ui.internal.controller.FigureController/handleEvent (line 300)
Error while evaluating Figure WindowButtonMotionFcn.

Error using matlab.ui.control.UIAxes/get
There is no CurrentPoint property on the UIAxes class.

Error in getCurrentPoint (line 10)
p = get(h,'CurrentPoint');

Error in impoly>impolyAPI/animateLine (line 577)
		[x_init,y_init] = getCurrentPoint(h_axes);

Error in iptaddcallback/callbackProcessor (line 149)
                    fun(varargin{:});
 
Error using matlab.ui.internal.controller.FigureController/handleEvent (line 300)
Error while evaluating Figure WindowButtonMotionFcn.

Error using matlab.ui.control.UIAxes/get
There is no CurrentPoint property on the UIAxes class.

Error in getCurrentPoint (line 10)
p = get(h,'CurrentPoint');

Error in impoly>impolyAPI/animateLine (line 577)
		[x_init,y_init] = getCurrentPoint(h_axes);

Error in iptaddcallback/callbackProcessor (line 149)
                    fun(varargin{:});
 
Error using matlab.ui.internal.controller.FigureController/handleEvent (line 300)
Error while evaluating Figure WindowButtonMotionFcn.

[Anatole Jimenez]

For this draw polygon :

function mask = drawplaque(app)
            h2 = drawpolygon(app.UIAxes);
end

This error :

Error using images.roi.internal.ROI/parseInputs
ROI parent must be a valid Axes object.

Error in images.roi.Polygon

Error in drawpolygon (line 155)
h = images.roi.Polygon(varargin{:});

Error in app2/drawplaque (line 84)
            h2 = drawpolygon(app.UIAxes);

Error in app2/DrawnewplaqueButtonPushed (line 151)
            mask = drawplaque(app);
 
Error using matlab.ui.control.internal.controller.ComponentController/executeUserCallback (line 335)
Error while evaluating Button PrivateButtonPushedFcn.

Answer 1

[Harshita Gupta]

Hello,

If you are using version R2018b or earlier then try mapping the current point of a UIFigure to the UIAxes.Should probably help.

[Anatole Jimenez]

Thank you for the answer Harshita Gupta.

I didn't quite understand, can you give an example for a UIFigure, 'fig1' and a UIAxes 'ax1' ?

Answer 2

[Pietro Prestininzi]

Having the same problem here, version 2019b.

News on the topic?

[Anatole Jimenez]

Hello Pietro,

Unfortunately I didn't find any solution at that time so I used an alternative.

I just open a new figure window when calling for a draw and repeat my figure on it.Then I use the function drawpolygon as it works on non-GUI figure.

[Pietro Prestininzi]

thanks!