"Reverting 28184"

tools/dom/src/Rectangle.dart

 // 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 $LIBRARYNAME;
+part of html;
 
-@DocsEditable()
-$(ANNOTATIONS)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS implements Rectangle$IMPLEMENTS$NATIVESPEC {
+/**
+ * A base class for representing two-dimensional rectangles. This will hopefully
+ * be moved merged with the dart:math Rect.
+ */
+// TODO(efortuna): Merge with Math rect after finalizing with Florian.
+abstract class RectBase {
+  //  Not used, but keeps the VM from complaining about Rect having a const
+  // constructor and this one not.
+  const RectBase();
 
-  // NOTE! All code below should be common with RectangleBase.
+  num get left;
+  num get top;
+  num get width;
+  num get height;
+
+  num get right => left + width;
+  num get bottom => top + height;
+
+  // NOTE! All code below should be common with Rect.
+
   String toString() {
     return '($left, $top, $width, $height)';
   }
 
   bool operator ==(other) {
     if (other is !Rect) return false;
     return left == other.left && top == other.top && width == other.width &&
         height == other.height;
   }
 
@@ skipping 71 matching lines @@
   /**
    * Truncates coordinates to integers and returns the result as a new
    * rectangle.
    */
   Rect toInt() => new Rect(left.toInt(), top.toInt(), width.toInt(),
       height.toInt());
 
   Point get topLeft => new Point(this.left, this.top);
   Point get bottomRight => new Point(this.left + this.width,
       this.top + this.height);
-$!MEMBERS}
+}
+
+
+
+/**
+ * A class for representing two-dimensional rectangles.
+ *
+ * This class is distinctive from RectBase in that it enforces that its
+ * properties are immutable.
+ */
+class Rect extends RectBase {
+  final num left;
+  final num top;
+  final num width;
+  final num height;
+
+  const Rect(this.left, this.top, this.width, this.height): super();
+
+  factory Rect.fromPoints(Point a, Point b) {
+    var left;
+    var width;
+    if (a.x < b.x) {
+      left = a.x;
+      width = b.x - left;
+    } else {
+      left = b.x;
+      width = a.x - left;
+    }
+    var top;
+    var height;
+    if (a.y < b.y) {
+      top = a.y;
+      height = b.y - top;
+    } else {
+      top = b.y;
+      height = a.y - top;
+    }
+
+    return new Rect(left, top, width, height);
+  }
+}