daily update on 20230301 by nitload youmu, file struct cahnged and more vec func added

源代码/StgSharp/Math/Tan.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace StgSharp.Math
+{
+    public static partial class Calc
+    {
+
+        public static float Tan(float x)
+        {
+            float refer = x / 360.0f;
+            refer -= (int)refer;
+
+            refer *= 40;
+            int a = (int)refer;   //大分度，查表
+            refer -= a;    //小分度，拟合
+
+            float refer2 = refer * refer;
+
+            float sin = (0.1570796327f * refer - 6.459640975e-4f * refer * refer2);
+            float cos = (1 - 0.0123370055f * refer2 + 2.536695709e-5f * refer2 * refer2);
+
+            return ( sinData[a] * cos + cosData[a] * sin )
+                / ( cosData[a] * cos - sinData[a] * sin );
+        }
+    }
+}