projects: update some short descriptions

[nit.git] / lib / scene2d.nit

diff --git a/lib/scene2d.nit b/lib/scene2d.nit
index 12167c9..2fadd09 100644 (file)
--- 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
@@ -48,9 +48,16 @@ class Sprite
        # height of the sprite
        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')