X-Git-Url: http://nitlanguage.org

diff --git a/lib/scene2d.nit b/lib/scene2d.nit
index 18a5d13..2fadd09 100644
--- a/lib/scene2d.nit
+++ b/lib/scene2d.nit
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# 2D management of game elements
+# Framework for 2D management of game elements
 #
 # TODO: collision framework (with quad tree?)
 module scene2d
@@ -23,7 +23,7 @@ abstract class LiveObject
 	fun update do end
 
 	# Controls whether `update' and `draw' are automatically called by `LiveGroup'
-	var exists writable = true
+	var exists = true is writable
 
 	# Redefine this method to asks how to draw on a view
 	fun draw(view: View) is abstract
@@ -37,27 +37,34 @@ class Sprite
 	super LiveObject
 
 	# x coordinate of the center point
-	var x: Int writable = 0
+	var x: Int = 0 is writable
 
 	# y coordinate of the center point
-	var y: Int writable = 0
+	var y: Int = 0 is writable
 
 	# width of the sprite
-	var width: Int writable = 100
+	var width: Int = 100 is writable
 
 	# height of the sprite
-	var height: Int writable = 100
+	var height: Int = 100 is writable
 
+	# X coordinate of left side.
 	fun left: Int do return x - width/2
+
+	# X coordinate of right side.
 	fun right: Int do return x + width/2
+
+	# Y coordinate of top.
 	fun top: Int do return y - height/2
+
+	# Y coordinate of bottom.
 	fun bottom: Int do return y + height/2
 
 	# x velocity (applied by `update')
-	var vx: Int writable = 0
+	var vx: Int = 0 is writable
 
 	# y velocity (applied by `update')
-	var vy: Int writable = 0
+	var vy: Int = 0 is writable
 
 	redef fun update
 	do
@@ -102,10 +109,6 @@ class LiveGroup[E: LiveObject]
 	super LiveObject
 	super List[E]
 
-	init
-	do
-	end
-
 	# Recursively update each live objects that `exists'
 	redef fun update
 	do
@@ -151,8 +154,8 @@ interface View
 	# This method must be implemented for each specific view.
 	# A traditional way of implementation is to use a double-dispatch mechanism
 	#
-	# Exemple:
 	#     class MyView
+	#         super View
 	#         redef fun draw_sprite(s) do s.draw_on_myview(self)
 	#     end
 	#     redef class Sprite