beginning of matrix class

utils/matrix/float32.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.
+
+/**
+ * Emulates the browser's Float32Array (so Matrix4 can be used outside
+ * the browser.

[Jacob, 2011/12/12 18:38:17]

note that this is really a Float64Array

[mattsh, 2011/12/12 19:14:45]

Done.

+ */
+

[Jacob, 2011/12/12 18:38:17]

extra line break

[mattsh, 2011/12/12 19:14:45]

Done.

+class Float32Array {
+  final List<double> buf;
+
+  Float32Array(int size) : buf = new List<double>(size) {
+    for (int i = 0; i < size; i++) {
+      buf[i] = 0.0;
+    }
+  }
+
+  double operator [](int i) {
+    return buf[i];
+  }
+
+  void operator []=(int i, num value) {
+    buf[i] = (value != null) ? value.toDouble() : 0.0;

[Bob Nystrom, 2011/12/12 21:46:09]

Why are you checking for null here?

[mattsh, 2011/12/12 22:48:26]

Might not be necessary, but it's emulating the Float32Array behavior where
null's automatically convert to zero.  Probably I should add a comment.

+  }
+}