| // 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, [ |
| /// Endian endian = Endian.big |
| /// ]) |
| /// 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 [byteOffset] 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.bytesPerElement; |
| |
| var byteDataFromF32 = new ByteData.view(f32.buffer); |
| for (int i = 0; i < byteDataFromF32.lengthInBytes / sizeInBytes; ++i) { |
| byteDataFromF32.setFloat32(i * sizeInBytes, valuesToBeSet[i], |
| Endian.little); |
| 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()); |
| } |
| } |