Adding Point & Rect primitives

tools/dom/src/Point.dart

Index: tools/dom/src/Point.dart
diff --git a/tools/dom/src/Point.dart b/tools/dom/src/Point.dart
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+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+part of html;
+
+/**
+ * A utility class for representing two-dimensional positions.
+ */
+class Point {
+  final num x;
+  final num y;
+
+  const Point([num x = 0, num y = 0]): x = x, y = y;
+
+  String toString() => '($x, $y)';
+
+  bool operator ==(other) {
+    if (other is !Point) return false;
+    return x == other.x && y == other.y;
+  }
+
+  Point operator +(Point other) {
+    return new Point(x + other.x, y + other.y);
+  }
+
+  Point operator -(Point other) {
+    return new Point(x - other.x, y - other.y);
+  }
+
+  Point operator *(num factor) {
+    return new Point(x * factor, y * factor);
+  }
+
+  /**
+   * Returns the distance between two points.
+   */
+  double distanceTo(Point other) {
+    var dx = x - other.x;
+    var dy = y - other.y;
+    return sqrt(dx * dx + dy * dy);
+  }
+
+  /**
+   * Returns the squared distance between two points.
+   *
+   * Squared distances can be used for comparisons when the actual value is not
+   * required.
+   */
+  num squaredDistanceTo(Point other) {
+    var dx = x - other.x;
+    var dy = y - other.y;
+    return dx * dx + dy * dy;
+  }
+
+  Point ceil() => new Point(x.ceil(), y.ceil());
+  Point floor() => new Point(x.floor(), y.floor());
+  Point round() => new Point(x.round(), y.round());
+
+  /**
+   * Truncates x and y to integers and returns the result as a new point.
+   */
+  Point toInt() => new Point(x.toInt(), y.toInt());
+}