27 lines
644 B
C#
27 lines
644 B
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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public static float Cos(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] * (0.1570796327f * refer - 6.459640975e-4f * refer * refer2)
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+ cosData[a] * (1 - 0.0123370055f * refer2 + 2.536695709e-5f * refer2 * refer2);
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}
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}
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}
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