56 lines
2.3 KiB
C#
56 lines
2.3 KiB
C#
//-----------------------------------------------------------------------
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//-----------------------------------------------------------------------
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// file="Tan.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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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 static float Tan( 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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float sin = ( 0.1570796327f * refer ) - ( 6.459640975e-4f * refer * refer2 );
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float cos = ( 1 - ( 0.0123370055f * refer2 ) ) + ( 2.536695709e-5f * refer2 * refer2 );
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return ( ( sinData[ a ] * cos ) + ( cosData[ a ] * sin ) ) / ( ( cosData[ a ] * cos ) - ( sinData[
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a ] * sin ) );
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}
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}
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}
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