Change the transparency/alpha of data brushing

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

Answer 1

[Nithin Kumar]

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.