colors: move mixing words to colors.mix.

basis/colors/colors-docs.factor

@@ -32,11 +32,6 @@ $nl
 { $subsections >rgba }
 "Extracting RGBA components of colors:"
 { $subsections >rgba-components }
-"Mixing colors:"
-{ $subsections
-    linear-gradient
-    sample-linear-gradient
-}
 "Further topics:"
 { $subsections
     "colors.protocol"

basis/colors/colors.factor

@@ -1,7 +1,7 @@
 ! Copyright (C) 2003, 2009 Slava Pestov.
 ! Copyright (C) 2008 Eduardo Cavazos.
 ! See http://factorcode.org/license.txt for BSD license.
-USING: accessors combinators kernel locals math sequences ;
+USING: accessors combinators kernel math ;
 IN: colors
 
 TUPLE: color ;
@@ -29,19 +29,5 @@ M: color blue>> ( color -- blue ) >rgba blue>> ;
 
 CONSTANT: transparent T{ rgba f 0.0 0.0 0.0 0.0 }
 
-: linear-gradient ( color1 color2 percent -- color )
-    [ 1.0 swap - * ] [ * ] bi-curry swapd
-    [ [ >rgba-components drop ] [ tri@ ] bi* ] 2bi@
-    [ + ] tri-curry@ tri* 1.0 <rgba> ;
-
-:: sample-linear-gradient ( colors percent -- color )
-    colors length :> num-colors
-    num-colors 1 - percent * >integer :> left-index
-    1.0 num-colors 1 - / :> cell-range
-    percent left-index cell-range * - cell-range / :> alpha
-    left-index colors nth :> left-color
-    left-index 1 + num-colors mod colors nth :> right-color
-    left-color right-color alpha linear-gradient ;
-
 : inverse-color ( color -- color' )
     >rgba-components [ [ 1.0 swap - ] tri@ ] dip <rgba> ;

basis/colors/mix/mix-tests.factor

@@ -1,5 +1,5 @@
 USING: colors.constants kernel tools.test ;
-IN: colors
+IN: colors.mix
 
 { COLOR: blue } [ COLOR: blue COLOR: red 0.0 linear-gradient ] unit-test
 { COLOR: red } [ COLOR: blue COLOR: red 1.0 linear-gradient ] unit-test

basis/colors/mix/mix.factor

@@ -0,0 +1,18 @@
+! Copyright (C) 2013 John Benediktsson
+! See http://factorcode.org/license.txt for BSD license
+USING: colors kernel locals math sequences ;
+IN: colors.mix
+
+: linear-gradient ( color1 color2 percent -- color )
+    [ 1.0 swap - * ] [ * ] bi-curry swapd
+    [ [ >rgba-components drop ] [ tri@ ] bi* ] 2bi@
+    [ + ] tri-curry@ tri* 1.0 <rgba> ;
+
+:: sample-linear-gradient ( colors percent -- color )
+    colors length :> num-colors
+    num-colors 1 - percent * >integer :> left-index
+    1.0 num-colors 1 - / :> cell-range
+    percent left-index cell-range * - cell-range / :> alpha
+    left-index colors nth :> left-color
+    left-index 1 + num-colors mod colors nth :> right-color
+    left-color right-color alpha linear-gradient ;