Roll Observatory packages and add a roll script

charted/lib/core/utils/rect.dart

-//
-// Copyright 2014 Google Inc. All rights reserved.
-//
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
-//
-
-part of charted.core.utils;
-
-/// Interface representing size and position of an element
-class Rect {
-  final num x;
-  final num y;
-  final num width;
-  final num height;
-
-  const Rect([this.x = 0, this.y = 0, this.width = 0, this.height = 0]);
-  const Rect.size(this.width, this.height) : x = 0, y = 0;
-  const Rect.position(this.x, this.y) : width = 0, height = 0;
-
-  bool operator==(other) =>
-      other is Rect && isSameSizeAs(other) && isSamePositionAs(other);
-
-  bool isSameSizeAs(Rect other) =>
-      other != null && width == other.width && height == other.height;
-
-  bool isSamePositionAs(Rect other) =>
-      other != null && x == other.x && y == other.y;
-
-  bool contains(num otherX, num otherY) =>
-      otherX >= x && otherX <= x + width &&
-      otherY >= y && otherY <= y + height;
-
-  String toString() => '$x, $y, $width, $height';
-}
-
-/// Mutable version of [Rect] class.
-class MutableRect extends Rect {
-  num x;
-  num y;
-  num width;
-  num height;
-
-  MutableRect(this.x, this.y, this.width, this.height);
-  MutableRect.size(this.width, this.height);
-  MutableRect.position(this.x, this.y);
-}
-
-class AbsoluteRect {
-  final num start;
-  final num end;
-  final num top;
-  final num bottom;
-
-  const AbsoluteRect(this.top, this.end, this.bottom, this.start);
-
-  bool operator==(other) =>
-      other is AbsoluteRect &&
-      start == other.start && end == other.end &&
-      top == other.top && bottom == other.bottom;
-}