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Change the transparency/alpha of data brushing

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Scott Smith
Scott Smith 2023-5-31
回答： Nithin Kumar 2023-6-6
Simple question, I'd like to change the transparency/alpha of the red brushed data points.
Is there any way to do this?
I know you can change the color, to blue like this
b = brush;
b.Color = [0 0 1]
And to get the brushed data (after brushing, in a callback)
get(b,'BrushedData') %hidden property...
But I'd like to change the transparency that matlab uses when brushing data, specifically a brushed scatter plot

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回答（1 个）

Nithin Kumar
Nithin Kumar 2023-6-6
Ran in:
Hi Scott,
To change the transparency of a brushed scatter plot, kindly refer to the following example.
x = rand(100,1);
y = rand(100,1);
scatter(x,y)
brush on
brushedDataHandle = findobj(gcf, 'Tag', 'brushed'); % findobj function is used here to get the handle to the brushed data points
set(brushedDataHandle, 'MarkerFaceAlpha', 0.5);
drawnow
For more information regarding “MarkerFaceAlpha” property, refer to the following documentation.
https://in.mathworks.com/help/matlab/creating_plots/add-transparency-to-graphics-objects.html
I hope this answer helps you.

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