rgba

fun rgba(block: Expression.ExpressionBuilder.() -> Unit)
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Creates a color value from red, green, blue components, which must range between 0 and 255, and an alpha component which must range between 0 and 1. If any component is out of range, the expression is an error.

fun rgba(red: Double, green: Double, blue: Double, alpha: Double)
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Add a RGBA color expression from numbers to the current expression builder.