| // 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()); |
| } |