Move client/{base, observable, layout, touch, util, view} to samples/ui_lib .

client/touch/Geometry.dart

-// Copyright (c) 2011, 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.
-
-/**
- * Represents a point in 2 dimensional space.
- */
-class Coordinate {
-
-  /**
-   * X-value
-   */
-  num x;
-
-  /**
-   * Y-value
-   */
-  num y;
-
-  Coordinate([num this.x = 0, num this.y = 0]) {
-  }
-
-  /**
-   * Gets the coordinates of a touch's location relative to the window's
-   * viewport. [input] is either a touch object or an event object.
-   */
-  Coordinate.fromClient(var input) : this(input.clientX, input.clientY);
-
-  static Coordinate difference(Coordinate a, Coordinate b) {
-    return new Coordinate(a.x - b.x, a.y - b.y);
-  }
-
-  static num distance(Coordinate a, Coordinate b) {
-    final dx = a.x - b.x;
-    final dy = a.y - b.y;
-    return Math.sqrt(dx * dx + dy * dy);
-  }
-
-  bool operator ==(Coordinate other) {
-    return other !== null && x == other.x && y == other.y;
-  }
-
-  static num squaredDistance(Coordinate a, Coordinate b) {
-    final dx = a.x - b.x;
-    final dy = a.y - b.y;
-    return dx * dx + dy * dy;
-  }
-
-  static Coordinate sum(Coordinate a, Coordinate b) {
-    return new Coordinate(a.x + b.x, a.y + b.y);
-  }
-
-  /**
-   * Returns a new copy of the coordinate.
-   */
-  Coordinate clone() => new Coordinate(x, y);
-
-  String toString() => "($x, $y)";
-}
-
-/**
- * Represents the interval { x | start <= x < end }.
- */
-class Interval {
-
-  final num start;
-  final num end;
-
-  Interval(num this.start, num this.end) {}
-
-  num get length() {
-    return end - start;
-  }
-
-  bool operator ==(Interval other) {
-    return other !== null && other.start == start && other.end == end;
-  }
-
-  Interval union(Interval other) {
-    return new Interval(Math.min(start, other.start),
-                        Math.max(end, other.end));
-  }
-
-  bool contains(num value) {
-    return value >= start && value < end;
-  }
-
-  String toString() {
-    return '(${start}, ${end})';
-  }
-}