53 lines
2.6 KiB
C#
53 lines
2.6 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Text;
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namespace StgSharp.Math
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{
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public static partial class Calc
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{
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private static readonly float[] sinData =
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{
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0f, 0.15643446239373f, 0.309016989278255f, 0.453990492577218f, 0.587785243621462f,
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0.707106771713121f, 0.80901698492516f, 0.891006515673128f, 0.951056509671091f, 0.987688336822657f,
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1f, 0.987688345205947f, 0.951056526231247f, 0.891006540002384f, 0.80901701642445f,
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0.707106809606826f, 0.587785286976515f, 0.453990540326073f, 0.309017040245177f, 0.156434515323744f,
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5.35897931701074E-08f, -0.156434409463716f, -0.309016938311333f, -0.453990444828362f, -0.587785200266408f,
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-0.707106733819413f, -0.809016953425868f, -0.891006491343869f, -0.951056493110931f, -0.987688328439363f,
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-0.999999999999997f, -0.987688353589235f, -0.951056542791401f, -0.891006564331638f, -0.809017047923737f,
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-0.70710684750053f, -0.587785330331566f, -0.453990588074927f, -0.309017091212098f, -0.156434568253757f,
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};
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private static readonly float[] cosData =
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{
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1f, 0.987688341014302f, 0.951056517951169f, 0.891006527837756f, 0.809017000674805f,
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0.707106790659974f, 0.587785265298989f, 0.453990516451646f, 0.309017014761716f, 0.156434488858737f,
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2.67948965850537E-08f, -0.156434435928723f, -0.309016963794794f, -0.453990468702791f, -0.587785221943935f,
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-0.707106752766267f, -0.809016969175515f, -0.891006503508499f, -0.951056501391011f, -0.98768833263101f,
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-0.999999999999999f, -0.987688349397591f, -0.951056534511324f, -0.891006552167012f, -0.809017032174094f,
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-0.707106828553679f, -0.587785308654041f, -0.4539905642005f, -0.309017065728638f, -0.156434541788751f,
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-8.03846893110719E-08f, 0.156434382998709f, 0.309016912827872f, 0.453990420953934f, 0.58778517858888f,
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0.707106714872559f, 0.809016937676222f, 0.891006479179238f, 0.951056484830851f, 0.987688324247716f,
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};
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public static unsafe float Sin(float x)
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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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}
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}
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