You can modify ginput to do that.
First make a copy of ginput.m, put it in your current folder and rename it to something like ginput_modified.m.
Then replace the function updateCrossHair in that file with this:
function updateCrossHair(fig, crossHair)
% update cross hair for figure.
gap = 3; % 3 pixel view port between the crosshairs
cp = hgconvertunits(fig, [fig.CurrentPoint 0 0], fig.Units, 'pixels', fig);
cp = cp(1:2);
ax = fig.CurrentAxes;
if isempty(ax)
return_early = true;
else
axPos = getpixelposition(ax,true);
axX = axPos(1);
axY = axPos(2);
axWidth = axPos(3);
axHeight = axPos(4);
return_early = cp(1) < axX+gap || cp(2) < axY+gap || cp(1)>axX+axWidth-gap || cp(2)>axY+axHeight-gap;
end
% Early return if point is outside the axes or no CurrentAxes
if return_early
set(fig,'Pointer','arrow');
set(crossHair, 'Visible', 'off');
return
end
cdata = NaN(16,16);
hotspot = [8,8];
set(gcf,'Pointer','custom','PointerShapeCData',cdata,'PointerShapeHotSpot',hotspot)
set(crossHair, 'Visible', 'on');
thickness = 1; % 1 Pixel thin lines.
set(crossHair(1), 'Position', [axX cp(2) cp(1)-axX-gap thickness]);
set(crossHair(2), 'Position', [cp(1)+gap cp(2) axX+axWidth-cp(1)-gap thickness]);
set(crossHair(3), 'Position', [cp(1) axY thickness cp(2)-axY-gap]);
set(crossHair(4), 'Position', [cp(1) cp(2)+gap thickness axY+axHeight-cp(2)-gap]);
end
Then call ginput_modified (or whatever you called it) from your code.
You need to make sure the uiaxes you want the crosshairs to show up in is the CurrentAxes of the uifigure, so do
app.UIFigure.CurrentAxes = app.UIAxes; % or whatever the relevant uiaxes is called in your app
before you call ginput_modified in your code.
