zoom scatter dots inside a figure
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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
回答 (1 件)
Samayochita
2025 年 2 月 14 日 10:10
編集済み: Samayochita
2025 年 2 月 14 日 10:31
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
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1826218/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1826219/image.png)
Hope this helps!
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