Initial commit

1 files changed, 48 insertions, 0 deletions

diff --git a/ihl/utils/IHLMathUtils.java b/ihl/utils/IHLMathUtils.java
new file mode 100644
index 0000000..cfd6931
--- /dev/null
+++ b/ihl/utils/IHLMathUtils.java
@@ -0,0 +1,48 @@
+package ihl.utils;
+
+public class IHLMathUtils 
+{
+	private final static int accuracy_level=65536;
+	private static float[] sin_table=new float[accuracy_level];
+	private static float[] atan_table=new float[accuracy_level];
+	private final static float PI=(float)Math.PI;
+	
+	public static float sin(float angle)
+	{
+		float angle1 = angle % (2*PI);
+		if(angle1<0)
+		{
+			angle1+=2*PI;
+		}
+		return sin_table[(int)(angle1*accuracy_level/2/PI)];
+	}
+	
+	public static float atan(float tan_value)
+	{
+		if(tan_value<-32f)
+		{
+			return -1.54f;
+		}
+		else if(tan_value>32f)
+		{
+			return 1.54f;
+		}
+		else
+		{
+			return atan_table[(int)((tan_value+32f)*accuracy_level/64f)];
+		}
+	}
+
+	
+	static
+	{
+		for(int i=0;i<accuracy_level;i++)
+		{
+			sin_table[i]=(float) Math.sin(2d*Math.PI*i/accuracy_level);
+		}
+		for(int i=0;i<accuracy_level;i++)
+		{
+			atan_table[i]=(float) Math.atan(-32d+64d*i/accuracy_level);
+		}
+	}
+}