Merge pull request #2784 from inclement/color_init

Added property name setters in Color __init__

kivy/graphics/context_instructions.pyx

@@ -183,7 +183,12 @@ cdef class Color(ContextInstruction):
         # using hsv mode + alpha
         c = Color(0, 1, 1, .2, mode='hsv')
 
-    In kv lang::
+    You can also set color components that are available as properties
+    by passing them as keyword arguments::
+
+        c = Color(b=0.5)  # sets the blue component only
+
+    In kv lang you can set the color properties directly::
 
         <Rule>:
             canvas:
@@ -225,6 +230,12 @@ cdef class Color(ContextInstruction):
             else:
                 self.set_state('color', [1.0, 1.0, 1.0, 1.0])
 
+        for property_name in ['r', 'g', 'b', 'a',
+                              'rgb', 'rgba', 'hsv',
+                              'h', 's', 'v']:
+            if property_name in kwargs:
+                setattr(self, property_name, kwargs[property_name])
+
     property rgba:
         '''RGBA color, list of 4 values in 0-1 range.
         '''