ceil/floor/truncate/round return integers.

samples/third_party/dromaeo/common/Math2.dart

 // Copyright (c) 2011, 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.
 
 part of common;
 
 // Various math-related utility functions.
 
 class Math2 {
   /// Computes the geometric mean of a set of numbers.
   /// [minNumber] is optional (defaults to 0.001) anything smaller than this
   /// will be changed to this value, eliminating infinite results.
   static double geometricMean(List<double> numbers,
                               [double minNumber = 0.001]) {
     double log = 0.0;
     int nNumbers = 0;
     for (int i = 0, n = numbers.length; i < n; i++) {
       double number = numbers[i];
       if (number < minNumber) {
         number = minNumber;
       }
       nNumbers++;
       log += Math.log(number);
     }
 
     return nNumbers > 0 ? Math.pow(Math.E, log / nNumbers) : 0.0;
   }
 
   static int round(double d) {
-    return d.round().toInt();
+    return d.round();
   }
 
   static int floor(double d) {
-    return d.floor().toInt();
+    return d.floor();
   }
 
   // TODO (olonho): use d.toStringAsFixed(precision) when implemented by DartVM
   static String toStringAsFixed(num d, int precision) {
     String dStr = d.toString();
     int pos = dStr.indexOf('.', 0);
     int end = pos < 0 ? dStr.length : pos + precision;
     if (precision > 0) {
       end++;
     }
     if (end > dStr.length) {
       end = dStr.length;
     }
 
     return dStr.substring(0, end);
   }
 }