From 422ca55b60bf029349476312f4bebf7709aea397 Mon Sep 17 00:00:00 2001
From: Eduardo Julian
Date: Thu, 18 Oct 2018 06:57:26 -0400
Subject: - Added "Alpha" abstraction. - Added "Pigment" abstraction.

---
 stdlib/source/lux/data/color.lux | 32 ++++++++++++++++++++++++++------
 1 file changed, 26 insertions(+), 6 deletions(-)

diff --git a/stdlib/source/lux/data/color.lux b/stdlib/source/lux/data/color.lux
index 55624f29e..c242a48ad 100644
--- a/stdlib/source/lux/data/color.lux
+++ b/stdlib/source/lux/data/color.lux
@@ -1,7 +1,9 @@
 (.module:
   [lux #*
-   [control ["eq" equivalence]]
+   [control
+    ["eq" equivalence]]
    [data
+    [number ("rev/." Interval<Rev>)]
     [collection
      ["." list ("list/." Functor<List>)]]]
    ["." math]
@@ -28,9 +30,9 @@
 
   (def: #export (color [red green blue])
     (-> [Nat Nat Nat] Color)
-    (:abstraction [(n/% rgb red)
-                   (n/% rgb green)
-                   (n/% rgb blue)]))
+    (:abstraction {#red (n/% rgb red)
+                   #green (n/% rgb green)
+                   #blue (n/% rgb blue)}))
 
   (def: #export to-rgb
     (-> Color [Nat Nat Nat])
@@ -216,8 +218,8 @@
             (interpolate' greenE greenS)
             (interpolate' blueE blueS)])))
 
-(def: black Color (color [0 0 0]))
-(def: white Color (color [top top top]))
+(def: #export black Color (color [0 0 0]))
+(def: #export white Color (color [top top top]))
 
 (do-template [<name> <target>]
   [(def: #export (<name> ratio color)
@@ -306,3 +308,21 @@
                          normalize
                          [hue saturation]
                          from-hsb))))))
+
+(type: #export Alpha Rev)
+
+(def: #export transparent
+  Alpha
+  rev/bottom)
+
+(def: #export translucent
+  Alpha
+  .5)
+
+(def: #export opaque
+  Alpha
+  rev/top)
+
+(type: #export Pigment
+  {#color Color
+   #alpha Alpha})
-- 
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