Add operator==, hashCode, and toString for Rect and Point dart classes.

sky/engine/core/painting/Point.dart

Index: sky/engine/core/painting/Point.dart
diff --git a/sky/engine/core/painting/Point.dart b/sky/engine/core/painting/Point.dart
index 9fc7082e707bb0c3dc50d944b3848430d42b1c39..60c9c5af66ae22b9df89dc37f6ba32fbf30c94a2 100644
--- a/sky/engine/core/painting/Point.dart
+++ b/sky/engine/core/painting/Point.dart
@@ -9,5 +9,18 @@ class Point {
   double y;
 
   Point(this.x, this.y);

[sethladd, 2015/05/27 22:19:49]

did you want to throw if x or y are null?

[Matt Perry, 2015/05/28 17:05:54]

Good question... not sure what behavior I want here.

-}
 
+  bool operator ==(other) {
+    if (!(other is Point)) return false;
+    return x == other.x && y == other.y;
+  }
+  int get hashCode {
+    int result = 373;
+    result = 37 * result + x.hashCode;
+    result = 37 * result + y.hashCode;
+    return result;
+  }
+  String toString() {

[sethladd, 2015/05/27 22:19:49]

not sure about your project's style, but this could be:

String toString() => "Point($x, $y)";

[Matt Perry, 2015/05/28 17:05:54]

Done.

+    return "Point($x, $y)";
+  }
+}