Merge pull request #646 from Hixie/animations

Trivial code changes for style and readability in animation/ directory.

packages/flutter/lib/animation/animated_simulation.dart

@@ -33,11 +33,11 @@ class Ticker {
       _animationId = null;
     }
 
+    // We take the _completer into a local variable so that !isTicking
+    // when we actually complete the future (isTicking uses _completer
+    // to determine its state).
     Completer localCompleter = _completer;
     _completer = null;
-
-    // We take the _completer into a local variable so that !isTicking when we
-    // actually complete the future.
     assert(!isTicking);
     localCompleter.complete();
   }

packages/flutter/lib/animation/forces.dart

@@ -10,27 +10,34 @@ abstract class Force {
 }
 
 class SpringForce extends Force {
-  SpringForce(this.spring, {this.left: 0.0, this.right: 1.0});
-
-  // We overshoot the target by this distance, but stop the simulation when
-  // the spring gets within this distance (regardless of how fast it's moving).
-  // This causes the spring to settle a bit faster than it otherwise would.
-  static final Tolerance tolerance =
-      new Tolerance(velocity: double.INFINITY, distance: 0.01);
+  SpringForce(this.spring, { this.left: 0.0, this.right: 1.0 });
 
   final SpringDescription spring;
+
   // Where to put the spring's resting point when releasing left or right,
   // respectively.
   final double left, right;
 
+  // We overshoot the target by this distance, but stop the simulation when
+  // the spring gets within this distance (regardless of how fast it's moving).
+  // This causes the spring to settle a bit faster than it otherwise would.
+  static final Tolerance tolerance = new Tolerance(
+    velocity: double.INFINITY,
+    distance: 0.01
+  );
+
   Simulation release(double position, double velocity) {
-    double target = velocity < 0.0 ?
-        this.left - tolerance.distance : this.right + tolerance.distance;
+    double target = velocity < 0.0 ? this.left - tolerance.distance
+                                   : this.right + tolerance.distance;
     return new SpringSimulation(spring, position, target, velocity)
       ..tolerance = tolerance;
   }
 }
 
-final SpringDescription _kDefaultSpringDesc =
-    new SpringDescription.withDampingRatio(mass: 1.0, springConstant: 500.0, ratio: 1.0);
+final SpringDescription _kDefaultSpringDesc = new SpringDescription.withDampingRatio(
+  mass: 1.0,
+  springConstant: 500.0,
+  ratio: 1.0
+);
+
 final SpringForce kDefaultSpringForce = new SpringForce(_kDefaultSpringDesc);