Big merge from experimental to bleeding edge.

samples/spirodraw/Spirodraw.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library spirodraw;
 
 import 'dart:html';
 import 'dart:math' as Math;
 
 part "ColorPicker.dart";
@@ skipping 139 matching lines @@
            ..drawImage(backCanvas, 0, 0);
       drawFixed();
     }
     drawWheel(theta);
   }
 
   void animate(double time) {
     if (run && rad <= maxTurns * PI2) {
       rad+=stepSize;
       drawFrame(rad);
-      int nTurns = (rad / PI2).toInt();
+      int nTurns = rad ~/ PI2;
       numTurns.text = '${nTurns}/$maxTurns';
       window.requestAnimationFrame(animate);
     } else {
       stop();
     }
   }
 
   void start() {
     refresh();
     rad = 0.0;
     run = true;
     window.requestAnimationFrame(animate);
   }
 
   int calcTurns() {
     // compute ratio of wheel radius to big R then find LCM
     if ((dUnits==0) || (rUnits==0)) return 1;
     int ru = rUnits.abs();
     int wrUnits = RUnits + rUnits;
     int g = gcf (wrUnits, ru);
-    return (ru ~/ g).toInt();
+    return ru ~/ g;
   }
 
   void stop() {
     run = false;
     // Show drawing only
     front..clearRect(0, 0, width, height)
          ..drawImage(backCanvas, 0, 0);
     // Reset angle
     rad = 0.0;
   }
@@ skipping 103 matching lines @@
 }
 
 int gcf(int n, int d) {
   if (n == d) return n;
   int max = Math.max(n, d);
   for (int i = max ~/ 2; i > 1; i--) {
     if ((n % i == 0) && (d % i == 0)) return i;
   }
   return 1;
 }