Plot position in uiaxes not precise?

Question

Jonas 2023-4-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1952158-plot-position-in-uiaxes-not-precise

评论： Jonas 2023-5-8

Dear community,

- Edit below -

I tried to plot a cross on an image placed into a uiaxes in a uifigure and i noticed, that the cross is not exactly at my mouse location. Is this a graphics problem on my side or does it also appear for others? I tried two version, once with the Intersection Point of the Image Button Down Callback and once the CurrentPoint property of the uiaxes callback, both do not result into precise crosses:

here a MWE:

f=uifigure;
ax=uiaxes(f);
im=imagesc(ax,rand(5));
hold(ax,'on');
im.ButtonDownFcn=@(~,event) plot(ax,event.IntersectionPoint(1),event.IntersectionPoint(2),'Color','red','Marker','x','MarkerSize',12);

and here using the current point of the axes:

f=uifigure;
ax=uiaxes(f);
im=imagesc(ax,rand(5));
im.HitTest="off";
hold(ax,'on');
ax.ButtonDownFcn=@(src,~) plot(src,src.CurrentPoint(1,1),src.CurrentPoint(1,2),'Color','red','Marker','x','MarkerSize',12);

unfortunately i can not show a screenshot, since the mouse in not captured using the windows onboard screenshot tools. The plot location can vary in all directions.

EDIT:

I just noticed the reason for this behavior may be due to the attached monitor I use with my laptop or the display scaling. Does somone know some kind of workaround for the issue?

EDIT2:

My setting were 125% scaling on the laptop screen and 100% scaling on the additional monitor. using these settings, the plot location was precise on th elaptio screen, but not on the monitor. If I change the scaling of the monitor also to 125%, the positioning becomes precise.

EDIT3:

finally, this is all about scaling problems in matlab. see workaround in

https://de.mathworks.com/matlabcentral/answers/1950403-why-is-the-matlab-desktop-blurry-on-my-high-dpi-display-in-windows

actually, i dont know if there is also that problem for compiled apps

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chicken vector 2023-4-24

在 MATLAB Online 中打开

Just a quick comment since you have already figured it out.

This always work, regardless of the monitor settings:

f=uifigure;
ax=uiaxes(f);
im=imagesc(ax,rand(5));
hold(ax,'on');
im.ButtonDownFcn={@makeCross,ax};
function makeCross(~,event,ax)
point = get(ax,'CurrentPoint')
plot(ax,point(1,1),point(1,2),'Color','red','Marker','x','MarkerSize',12);
end

Jonas 2023-5-8

thanks for response. the method using CurrentPoint seems to bit slightly better, bit for me it also does not perform perfectly

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Plot position in uiaxes not precise?

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