Changing the brush color using a color picker - different format

whats the best way to convert the numbers in val

val =[1 1 0]   % From color picker

To the format required here:

marker.FaceColorData=uint8(255*[1;0;0;1]);  %Brush color, 4th digit is alpha  Alpha=0.3 => 70% transparent red

thanks

(https://undocumentedmatlab.com/articles/hidden-hg2-plot-functionality)

Answer 1

[dpb]

Depends just slightly on whether you want to be able to set the alpha value other than the default 1...this is a good application for an anonymous function.

val2Face=@(v,a)uint8(255*[v(:);a]);     % anonymous function to include alpha
val =[1 1 0];                           % From color picker
alpha=0.7;                              % example alpha

cvec=val2Face(val,alpha)

cvec = 4×1

255 255 0 179

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If don't care about alpha, just omit it from the argument list and append the 1 in its place...

val2Face=@(v)uint8(255*[v(:);1]);     % anonymous function with full strength

[Jason]

Thanks