zoom scatter dots inside a figure

hi,

zooming into a figure does not correspondingly enlarge the scatter dots in the figure (for example).

is there an elegant way of doing it?

thanks a lot,

mat

[mat]

hi

can anyone help?

thanks a lot !

mat

Answer 1

[Samayochita]

Hi mat,

To make the scatter points appear to zoom proportionally with the figure, you can use ‘SizeData’ property (https://in.mathworks.com/help/matlab/ref/scatter.html#:~:text=Change%20the%20marker,SizeData%20%3D%20100%3B%0Acolorbar) along with ActionPostCallback.

Below is a code section of how you could achieve this:

s = 100;  % A random marker size 
figure; 
hScatter = scatter(x, y, s, 'filled'); 
% Adjust marker size when zooming 
zoomObj = zoom; 
set(zoomObj, 'ActionPostCallback', @(src, evnt) adjustMarkerSize(hScatter)); 
% zoomObj.ActionPostCallback triggers adjustMarkerSize after zooming. 

The “adjustMarkerSize” function has been defined to fetch the axes limits (XLim, YLim) to determine the zoom level and adjust the “SizeData” property as you zoom into the plot.

function adjustMarkerSize(hScatter) 
    ax = ancestor(hScatter, 'axes');  
    xLim = ax.XLim; 
    yLim = ax.YLim; 
     
    % Compute new marker size based on zoom level  
    scaleFactor = mean([diff(xLim), diff(yLim)]);  
    hScatter.SizeData = 1000 / scaleFactor;  % Adjust size inversely to zoom level 
end

Hope this helps!