Implement measurement using futures

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 {
 
   /**
@@ skipping 35 matching lines @@
     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);
-  }
+  Coordinate clone() => new Coordinate(x, y);
 
-  /**
-   * Returns a nice string representing the coordinate.
-   * @return {string} In the form (50, 73).
-   */
-  String toString() {
-    return "(${x}, ${y})";
-  }
+  String toString() => "($x, $y)";

[nweiz, 2011/10/28 03:58:38]

Class name?

[Jacob, 2011/10/31 22:09:50]

We intentionally avoid the class name.

If you wrote
print ("Drag from $start to $end")
would you rather get
"Drag from Coordinate(3,4), to Coordinate(8,9)"
or
"Drag from (3,4) to (8,9)"

?

 }
 
 /**
- * A utility class for representing two-dimensional sizes.
- */
-class Size {
-  num width;
-  num height;
-
-  Size(num this.width, num this.height) {
-  }
-
-  bool operator ==(Size other) {
-    return other !== null && width == other.width && height == other.height;
-  }
-
-  /**
-   * Returns the area of the size (width * height).
-   */
-  num area() {
-    return width * height;
-  }
-
-  /**
-   * Returns the ratio of the size's width to its height.
-   */
-  num aspectRatio() {
-    return width / height;
-  }
-
-  /**
-   * Clamps the width and height parameters upward to integer values.
-   * Returns this size with ceil'd components.
-   */
-  Size ceil() {
-    width = width.ceil();
-    height = height.ceil();
-    return this;
-  }
-
-  /**
-   * Returns a new copy of the Size.
-   */
-  Size clone() {
-    return new Size(width, height);
-  }
-
-  /**
-   * Returns true if this Size is the same size or smaller than the
-   * [target] size in both dimensions.
-   */
-  bool fitsInside(Size target) {
-    return width <= target.width && height <= target.height;
-  }
-
-  /**
-   * Clamps the width and height parameters downward to integer values.
-   * Returns this size with floored components.
-   */
-  Size floor() {
-    width = width.floor();
-    height = height.floor();
-    return this;
-  }
-
-  /**
-   * Returns the longer of the two dimensions in the size.
-   */
-  num getLongest() {
-    return Math.max(width, height);
-  }
-
-  /**
-   * Returns the shorter of the two dimensions in the size.
-   */
-  num getShortest() {
-    return Math.min(width, height);
-  }
-
-  /**
-   * Returns true if the size has zero area, false if both dimensions
-   *     are non-zero numbers.
-   */
-  bool isEmpty() {
-    return area() == 0;
-  }
-
-  /**
-   * Returns the perimeter of the size (width + height) * 2.
-   */
-  num perimeter() {
-    return (width + height) * 2;
-  }
-
-  /**
-   * Rounds the width and height parameters to integer values.
-   * Returns this size with rounded components.
-   */
-  Size round() {
-    width = width.round();
-    height = height.round();
-    return this;
-  }
-
-  /**
-   * Scales the size uniformly by a factor.
-   * [s] The scale factor.
-   * Returns this Size object after scaling.
-   */
-  Size scale(num s) {
-    width *= s;
-    height *= s;
-    return this;
-  }
-
-  /**
-   * Uniformly scales the size to fit inside the dimensions of a given size. The
-   * original aspect ratio will be preserved.
-   *
-   * This function assumes that both Sizes contain strictly positive dimensions.
-   * Returns this Size object, after optional scaling.
-   */
-  Size scaleToFit(Size target) {
-    num s = aspectRatio() > target.aspectRatio() ?
-        target.width / width : target.height / height;
-    return scale(s);
-  }
-
-  /**
-   * Returns a nice string representing size.
-   * Returns in the form (50 x 73).
-   */
-  String toString() {
-    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() {
@@ skipping 10 matching lines @@
   }
 
   bool contains(num value) {
     return value >= start && value < end;
   }
 
   String toString() {
     return '(${start}, ${end})';
   }
 }