Move Point and Rect over to dart:math, to be re-exported by dart:html.

sdk/lib/math/point.dart

 // 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;
+part of dart.math;
 
 /**
  * A utility class for representing two-dimensional positions.
  */
-class Point {
-  final num x;
-  final num y;
+class Point<T extends num> {
+  final T x;
+  final T y;
 
-  const Point([num x = 0, num y = 0]): x = x, y = y;
+  const Point([T x = 0, T y = 0]): x = x, y = y;

[floitsch, 2013/10/02 08:54:09]

*minor* nit: this.x = x, this.y = y;

[Emily Fortuna, 2013/10/02 18:32:40]

Done.

 
   String toString() => '($x, $y)';
 
   bool operator ==(other) {
     if (other is !Point) return false;
     return x == other.x && y == other.y;
   }
 
-  int get hashCode => JenkinsSmiHash.hash2(x.hashCode, y.hashCode);
+  int get hashCode => _JenkinsSmiHash.hash2(x.hashCode, y.hashCode);
 
-  Point operator +(Point other) {
+  Point<T> operator +(Point<T> other) {
     return new Point(x + other.x, y + other.y);
   }
 
-  Point operator -(Point other) {
+  Point<T> operator -(Point<T> other) {
     return new Point(x - other.x, y - other.y);
   }
 
-  Point operator *(num factor) {
+  Point<T> operator *(T factor) {

[floitsch, 2013/10/02 08:54:09]

that one is hard.
There is no reason not to write Point<double> * 2

being pedantic: this is not really a point operation, but a vector operation.
And point - point should then rather return a vector.

But it is really annoying not to have a Point class, but also annoying to have a
Vector and Point class...

[Emily Fortuna, 2013/10/02 18:32:40]

Done.

     return new Point(x * factor, y * factor);
   }
 
   /**
    * Get the straight line (Euclidean) distance between the origin (0, 0) and
    * this point.
    */
-  num get magnitude => sqrt(x * x + y * y);
+  T get magnitude => sqrt(x * x + y * y);
 
   /**
    * Returns the distance between two points.

[floitsch, 2013/10/02 08:54:09]

`this` and [other].

[Emily Fortuna, 2013/10/02 18:32:40]

Done.

    */
-  double distanceTo(Point other) {
+  double distanceTo(Point<T> other) {
     var dx = x - other.x;
     var dy = y - other.y;
     return sqrt(dx * dx + dy * dy);
   }
 
   /**
    * Returns the squared distance between two points.

[floitsch, 2013/10/02 08:54:09]

ditto.

[Emily Fortuna, 2013/10/02 18:32:40]

Done.

    *
    * Squared distances can be used for comparisons when the actual value is not
    * required.
    */
-  num squaredDistanceTo(Point other) {
+  T squaredDistanceTo(Point<T> 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());
+  Point<T> ceil() => new Point<T>(x.ceil(), y.ceil());

[Emily Fortuna, 2013/10/01 23:12:21]

One could argue that these should always return Point<int>.  But if you have a
Point<double> and you want to call ceil() on it, I'm guessing you still want it
to be able to be added to other Point<double>s, otherwise, you can call
truncate() to get a proper int. I can be persuaded otherwise, though.

[floitsch, 2013/10/02 08:54:09]

Are these functions really needed?

I think you need to make it Point<int>, since ceil always returns an int. Afaics
there is no way to convert a number to "T".

The current code doesn't even work since ceil returns an int. (Add a test: new
Point<double>(1.0, 2.0).ceil() )

[Emily Fortuna, 2013/10/02 18:32:40]

Done (converted them to int).

These functions were just in the html version of the class, but I have no qualms
deleting them. Remove?

+  Point<T> floor() => new Point<T>(x.floor(), y.floor());
+  Point<T> round() => new Point<T>(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());
+  Point<int> truncate() => new Point<int>(x.toInt(), y.toInt());
 }