Differences

This shows you the differences between two versions of the page.

--- harlowe:rgba [2017/10/09 20:39]
+++ harlowe:rgba [2017/10/09 20:39] (current)
@@ Line 1: / Line 1: @@
+**(rgba: // [[harlowe:Number|Number]], Number, Number, Number//) -> //[[harlowe:Colour|colour]]//**
+A special version of [[harlowe:rgb|(rgb:)]], this macro allows you to supply not just the red (r),
+green (g) and blue (b) values, but also the transparency (alpha, or a) percentage, which
+is a fractional value between 0 (fully transparent) and 1 (fully visible).
+Anything drawn with a partially transparent [[harlowe:colour|colour]] will itself be partially transparent. You
+can then layer such elements to produce a few interesting visual effects.
+=== Example usage: ===
+''%%(rgba: 178, 229, 178, 0.6)%%'' produces a 40% transparent faint green.
+=== Details: ===
+This macro takes the same range of [[harlowe:number|number]] as the CSS ''%%rgba()%%'' function.
+Giving alpha percentages higher than 1 or lower than 0 will cause an error.
+=== See also: ===
+[[harlowe:rgb|(rgb:)]], [[harlowe:hsl|(hsl:)]], [[harlowe:hsla|(hsla:)]]

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