LibTest/typed_data/ByteData/setFloat32_A01_t01.dart

/*
 * Copyright (c) 2013, 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.
 */
/**
 * @assertion void setFloat32(int byteOffset, double value, [Endianness endian = Endianness.BIG_ENDIAN])
 *  Sets the four bytes starting at the specified [byteOffset] in this
 * object to the IEEE 754 single-precision binary floating-point
 * (binary32) representation of the specified [value].
 * @description Checks that the value at the [offset] is set to [value].
 * @author msyabro
 */

import "dart:typed_data";
import "../../../Utils/expect.dart";

main() {
  var f32 = new Float32List(7);
  var valuesToBeSet = [.0, .12, 0.123e32, -0.312e-31, 10.0, 1.401298464324817e-45, 1.1754943508222875e-38];
  var expectedBigEndian =
    [.0, -1.9224339301483423e-29, 3.78526854048973e+30, -1.542172430965457e+26,
    1.1570521419930015e-41, 2.350988701644575e-38, 4.591774807899561e-41];
  var sizeInBytes =  Float32List.BYTES_PER_ELEMENT;

  var byteDataFromF32 = new ByteData.view(f32.buffer);
  for(int i = 0; i < byteDataFromF32.lengthInBytes / sizeInBytes; ++i) {
    byteDataFromF32.setFloat32(i * sizeInBytes, valuesToBeSet[i], Endianness.LITTLE_ENDIAN);
    Expect.approxEquals(valuesToBeSet[i], f32[i], (f32[i]/1e7).abs()) ;
  }

  for(int i = 0; i < byteDataFromF32.lengthInBytes / sizeInBytes; ++i) {
    byteDataFromF32.setFloat32(i * sizeInBytes, valuesToBeSet[i]);
    Expect.approxEquals(expectedBigEndian[i], f32[i], (f32[i]/1e7).abs()) ;
  }
}