Convert everything in the Sky API from degrees to radians.

sky/examples/raw/sector_layout.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:math' as math;
 import 'dart:sky' as sky;
 import 'package:sky/framework/app.dart';
 import 'package:sky/framework/rendering/box.dart';
 import 'package:sky/framework/rendering/object.dart';
 
 const double kTwoPi = 2 * math.PI;
 
-double deg(double radians) => radians * 180.0 / math.PI;
-
 class SectorConstraints {
   const SectorConstraints({
     this.minDeltaRadius: 0.0,
     this.maxDeltaRadius: double.INFINITY,
     this.minDeltaTheta: 0.0,
     this.maxDeltaTheta: kTwoPi
   });
 
   const SectorConstraints.tight({ double deltaRadius: 0.0, double deltaTheta: 0.0 })
     : minDeltaRadius = deltaRadius,
@@ skipping 96 matching lines @@
     assert(parentData is SectorParentData);
 
     if (_decoration == null)
       return;
 
     if (_decoration.backgroundColor != null) {
       Paint paint = new Paint()..color = _decoration.backgroundColor;
       Path path = new Path();
       double outerRadius = (parentData.radius + deltaRadius);
       Rect outerBounds = new Rect.fromLTRB(-outerRadius, -outerRadius, outerRadius, outerRadius);
-      path.arcTo(outerBounds, deg(parentData.theta), deg(deltaTheta), true);
+      path.arcTo(outerBounds, parentData.theta, deltaTheta, true);
       double innerRadius = parentData.radius;
       Rect innerBounds = new Rect.fromLTRB(-innerRadius, -innerRadius, innerRadius, innerRadius);
-      path.arcTo(innerBounds, deg(parentData.theta + deltaTheta), deg(-deltaTheta), false);
+      path.arcTo(innerBounds, parentData.theta + deltaTheta, -deltaTheta, false);
       path.close();
       canvas.drawPath(path, paint);
     }
   }
 }
 
 class SectorChildListParentData extends SectorParentData with ContainerParentDataMixin<RenderSector> { }
 
 class RenderSectorWithChildren extends RenderDecoratedSector with ContainerRenderObjectMixin<RenderSector, SectorChildListParentData> {
   RenderSectorWithChildren(BoxDecoration decoration) : super(decoration);
@@ skipping 354 matching lines @@
   rootCircle.add(new RenderSolidColor(const Color(0xFF0000FF), desiredDeltaTheta: kTwoPi * 0.4));
   var stack = new RenderSectorSlice(padding: 2.0);
   stack.add(new RenderSolidColor(const Color(0xFFFFFF00), desiredDeltaRadius: 20.0));
   stack.add(new RenderSolidColor(const Color(0xFFFF9000), desiredDeltaRadius: 20.0));
   stack.add(new RenderSolidColor(const Color(0xFF00FF00)));
   rootCircle.add(stack);
 
   var root = new RenderBoxToRenderSectorAdapter(innerRadius: 50.0, child: rootCircle);
   app = new AppView(root);
 }