AnimatedType should hit |end|

sky/sdk/lib/animation/animation_performance.dart

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 import 'package:sky/animation/timeline.dart';
 import 'package:sky/animation/curves.dart';
 
 abstract class AnimatedVariable {
   void setFraction(double t);
   String toString();
 }
 
 class AnimatedType<T extends dynamic> extends AnimatedVariable {
   AnimatedType(this.begin, { this.end, this.curve: linear }) {
     value = begin;
   }
 
   T value;
   T begin;
   T end;
   Curve curve;
 
   void setFraction(double t) {
     if (end != null) {
-      // TODO(mpcomplete): Reverse the timeline and curve.
-      value = begin + (end - begin) * curve.transform(t);
+      if (t == 1.0) {
+        value = end;
+      } else {
+        // TODO(mpcomplete): Reverse the timeline and curve.
+        value = begin + (end - begin) * curve.transform(t);
+      }
     }
   }
 
   String toString() => 'AnimatedType(begin=$begin, end=$end, value=$value)';
 }
 
 class AnimatedList extends AnimatedVariable {
   List<AnimatedVariable> variables;
   AnimatedList(this.variables);
   void setFraction(double t) {
@@ skipping 78 matching lines @@
     timeline.stop();
     if (remainingDistance != 0.0)
       timeline.animateTo(target, duration: remainingDistance * duration.inMilliseconds);
   }
 
   void _tick(double t) {
     variable.setFraction(t);
     _notifyListeners();
   }
 }