32 lines
1.0 KiB
C++
32 lines
1.0 KiB
C++
#ifndef HGL_ALGORITHM_MATH_FAST_TRIANGLE_FUNCTION_INCLUDE
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#define HGL_ALGORITHM_MATH_FAST_TRIANGLE_FUNCTION_INCLUDE
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namespace hgl
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{
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double Lsin(int angle); ///<低精度sin计算,注意传入的参数为角度而非弧度
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double Lcos(int angle); ///<低精度cos计算,注意传入的参数为角度而非弧度
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void Lsincos(int angle, double &s, double &c); ///<低精度sin+cos计算,注意传入的参数为角度而非弧度
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/**
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* 低精度atan函数
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*/
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double inline Latan(double z)
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{
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constexpr double n1 = 0.97239411f;
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constexpr double n2 = -0.19194795f;
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return (n1 + n2 * z * z) * z;
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}
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double Latan2(double y, double x); ///<低精度atan2函数
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/**
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* 近似Pow2.2，使用此函数等于pow(x,2.2)
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*/
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double inline LPow22(double x)
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{
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return x*(1.12*x - 0.12);
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}
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}//namespace hgl
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#endif//HGL_ALGORITHM_MATH_FAST_TRIANGLE_FUNCTION_INCLUDE
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