Split Size into Size and Offset.

sky/sdk/lib/widgets/radio.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 'dart:sky' as sky;
 
 import '../rendering/object.dart';
 import '../theme/colors.dart' as colors;
 import 'basic.dart';
 import 'button_base.dart';
@@ skipping 32 matching lines @@
         width: kDiameter,
         height: kDiameter,
         child: new CustomPaint(
           callback: (sky.Canvas canvas, Size size) {
 
             Paint paint = new Paint()..color = color;
 
             // Draw the outer circle
             paint.setStyle(sky.PaintingStyle.stroke);
             paint.strokeWidth = 2.0;
-            canvas.drawCircle(kOuterRadius, kOuterRadius, kOuterRadius, paint);
+            canvas.drawCircle(const Point(kOuterRadius, kOuterRadius), kOuterRadius, paint);
 
             // Draw the inner circle
             if (value == groupValue) {
               paint.setStyle(sky.PaintingStyle.fill);
-              canvas.drawCircle(kOuterRadius, kOuterRadius, kInnerRadius, paint);
+              canvas.drawCircle(const Point(kOuterRadius, kOuterRadius), kInnerRadius, paint);
             }
           }
         )
       ),
       onGestureTap: _handleClick
     );
   }
 
   void _handleClick(_) {
     onChanged(value);
   }
 
 }