fillAlpha

@get:FloatRange(from = 0.0, to = 1.0)

Returns the fill alpha.

NOTE: Added in v2024.6. Currently this API is the only way to change this value. If you need a UI for it, please contact support.

Fill alpha for the annotation. It's the value in range <0.0f...1.0f>. Default value is 1.0f.