72 lines
4.1 KiB
C#
72 lines
4.1 KiB
C#
//-----------------------------------------------------------------------
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//-----------------------------------------------------------------------
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// file="Sin.cs"
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// Project: StgSharp
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// AuthorGroup: Nitload Space
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// Copyright (c) Nitload Space. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person
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// obtaining a copy of this software and associated documentation
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// files (the “Software”), to deal in the Software without restriction,
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// including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software,
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// and to permit persons to whom the Software is furnished to do so,
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// subject to the following conditions:
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//
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// The above copyright notice and
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// this permission notice shall be included in all copies
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// or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED “AS IS”,
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// WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH
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// THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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//-----------------------------------------------------------------------
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//-----------------------------------------------------------------------
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using System;
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using System.Net.NetworkInformation;
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using System.Runtime.CompilerServices;
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namespace StgSharp.Math
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{
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public static partial class Scaler
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{
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public const float Pi = 3.1415926f;
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private static readonly float[] cosData = {
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1f, 0.987688341014302f, 0.951056517951169f, 0.891006527837756f, 0.809017000674805f, 0.707106790659974f, 0.587785265298989f, 0.453990516451646f, 0.309017014761716f, 0.156434488858737f, 2.67948965850537E-08f, -0.156434435928723f, -0.309016963794794f, -0.453990468702791f, -0.587785221943935f, -0.707106752766267f, -0.809016969175515f, -0.891006503508499f, -0.951056501391011f, -0.98768833263101f, -0.999999999999999f, -0.987688349397591f, -0.951056534511324f, -0.891006552167012f, -0.809017032174094f, -0.707106828553679f, -0.587785308654041f, -0.4539905642005f, -0.309017065728638f, -0.156434541788751f, -8.03846893110719E-08f, 0.156434382998709f, 0.309016912827872f, 0.453990420953934f, 0.58778517858888f, 0.707106714872559f, 0.809016937676222f, 0.891006479179238f, 0.951056484830851f, 0.987688324247716f,
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};
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private static readonly float[] sinData = {
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0f, 0.15643446239373f, 0.309016989278255f, 0.453990492577218f, 0.587785243621462f, 0.707106771713121f, 0.80901698492516f, 0.891006515673128f, 0.951056509671091f, 0.987688336822657f, 1f, 0.987688345205947f, 0.951056526231247f, 0.891006540002384f, 0.80901701642445f, 0.707106809606826f, 0.587785286976515f, 0.453990540326073f, 0.309017040245177f, 0.156434515323744f, 5.35897931701074E-08f, -0.156434409463716f, -0.309016938311333f, -0.453990444828362f, -0.587785200266408f, -0.707106733819413f, -0.809016953425868f, -0.891006491343869f, -0.951056493110931f, -0.987688328439363f, -0.999999999999997f, -0.987688353589235f, -0.951056542791401f, -0.891006564331638f, -0.809017047923737f, -0.70710684750053f, -0.587785330331566f, -0.453990588074927f, -0.309017091212098f, -0.156434568253757f,
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};
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[MethodImpl( MethodImplOptions.AggressiveInlining )]
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public static unsafe float Sin( float x )
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{
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/*
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float refer = x / 360.0f;
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refer -= (int)refer;
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refer *= 40;
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int a = (int)refer; //大分度，查表
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refer -= a; //小分度，拟合
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float refer2 = refer * refer;
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return (sinData[a] * ((1 - (0.0123370055f * refer2)) + (2.536695709e-5f * refer2 * refer2)))
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+ (cosData[a] * ((0.1570796327f * refer) - (6.459640975e-4f * refer * refer2)));
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*/
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return MathF.Sin( x );
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}
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}
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}
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