Baby steps towards an odeon-like animation system. First victim: Drawer.

sky/sdk/lib/painting/box_painter.dart

Index: sky/sdk/lib/painting/box_painter.dart
diff --git a/sky/sdk/lib/painting/box_painter.dart b/sky/sdk/lib/painting/box_painter.dart
index 6f3a9d6e4995a4720473d53c84ac01c96d20af4e..318daf6f2f61e93676ef1e920db829b7c34e58dd 100644
--- a/sky/sdk/lib/painting/box_painter.dart
+++ b/sky/sdk/lib/painting/box_painter.dart
@@ -6,6 +6,7 @@ import 'dart:math' as math;
 import 'dart:sky' as sky;
 import 'dart:sky' show Point, Offset, Size, Rect, Color, Paint, Path;
 
+import '../base/lerp.dart';
 import 'shadows.dart';
 import 'package:sky/mojo/net/image_cache.dart' as image_cache;
 
@@ -70,6 +71,11 @@ class BoxShadow {
   final double blur;
 
   String toString() => 'BoxShadow($color, $offset, $blur)';
+
+  static BoxShadow lerp(BoxShadow a, BoxShadow b, double t) =>

[Hixie, 2015/06/30 23:11:56]

Why BoxShadow.lerp() but lerpColor()?

[Matt Perry, 2015/07/01 18:17:43]

Good question. Made it a global.

+    new BoxShadow(color: lerpColor(a.color, b.color, t),
+                  offset: lerpOffset(a.offset, b.offset, t),
+                  blur: lerpNum(a.blur, b.blur, t));
 }
 
 abstract class Gradient {