MATLAB: Hittest axes with WindowWheelScrollFcn callback

axeshittestwindowwheelscrollfcn

I am attempting to make a GUI that has interaction using the mouse wheel, and the GUI behavior should depend on which element the mouse cursor is over when the mouse wheel is used. There are multiple axes objects, and I have previously (probably around 2012) used hittest to check which axes the mouse cursor was hovering over. However, this no longer works unless I first use mouse click on the axes.

It seems like an odd behavior imo. Is there any way to achieve what I want without having to click on the axes first?

Best Answer

Try overobj2 from http://undocumentedmatlab.com/blog/undocumented-mouse-pointer-functions

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MATLAB: WindowButtonDownFcn conflicting with ButtonDownFcn

You can insert an axes object spanning this whole figure as a background and use its ButtonDownFcn:

BGcolor = get(0, 'DefaultFigureColor');
BGaxes = axes('Units', 'normalized', 'Position', [0,0,1,1], ...
              'XTicks, [], 'YTicks', [], ...
              'Color', BGcolor, 'XColor', BGcolor, 'YColor', BGcolor, ...
              'ButtonDownFcn', 'disp(''Background'')');
DataAxes = axes('ButtonDownFcn', 'disp(''Data'')';

MATLAB: GUIDE: gcf windowscrollWheelFcn and gca ButtonDownFcn interaction

without seeing the actual code I can only speculate - but it sounds like the ButtonDownFcn is being removed when you replot, this happens by design when the axes nextplot property is 'replace'.

See the example below on how changing the nextplot to be 'add' alters the behaviour (note you need to clear the axes "cla" when you want to draw a new plot.

 function test
   f = figure;
   a1 = axes ( 'parent', f, 'position', [0 0 0.5 0.5], 'ButtonDownFcn', @redrawA1 );
   a2 = axes ( 'parent', f, 'position', [0.5 0.5 0.5 0.5], 'ButtonDownFcn', @redrawA2, 'nextplot', 'add' );
 end
 function redrawA1 ( obj, event )
   disp( 'in callback A1' );
   plot ( gca, rand(10), rand(10) );
 end
 function redrawA2 ( obj, event )
   cla ( gca )
   disp( 'in callback A2' );
   plot ( gca, rand(10), rand(10) );
 end

Best Answer

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MATLAB: WindowButtonDownFcn conflicting with ButtonDownFcn

MATLAB: GUIDE: gcf windowscrollWheelFcn and gca ButtonDownFcn interaction

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