Implement measurement using futures

client/base/Size.dart

Index: client/base/Size.dart
diff --git a/client/touch/Geometry.dart b/client/base/Size.dart
similarity index 61%
copy from client/touch/Geometry.dart
copy to client/base/Size.dart
index c406f11136a25622f57ad063971b2844cb40db01..ca6624bcbbb693ac31dd667848f95838d889fbc8 100644
--- a/client/touch/Geometry.dart
+++ b/client/base/Size.dart
@@ -3,70 +3,6 @@
 // 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() {
-    return new Coordinate(x, y);
-  }
-
-  /**
-   * Returns a nice string representing the coordinate.
-   * @return {string} In the form (50, 73).
-   */
-  String toString() {
-    return "(${x}, ${y})";
-  }
-}
-
-/**
  * A utility class for representing two-dimensional sizes.
  */
 class Size {
@@ -200,35 +136,3 @@ class Size {
     return "(${width} x ${height})";
   }
 }
-
-/**
- * Represents the interval { x | start <= x < end }.
- */
-class Interval {
-
-  final num start;
-  final num end;
-
-  Interval(num this.start, num this.end) {}
-
-  num get length() {
-    return end - start;
-  }
-
-  bool operator ==(Interval other) {
-    return other !== null && other.start == start && other.end == end;
-  }
-
-  Interval union(Interval other) {
-    return new Interval(Math.min(start, other.start),
-                        Math.max(end, other.end));
-  }
-
-  bool contains(num value) {
-    return value >= start && value < end;
-  }
-
-  String toString() {
-    return '(${start}, ${end})';
-  }
-}