1 files changed, 91 insertions, 0 deletions

diff --git a/src/core/General.h b/src/core/General.h
new file mode 100644
index 00000000..cae1caa0
--- /dev/null
+++ b/src/core/General.h
@@ -0,0 +1,91 @@
+#pragma once
+
+class CGeneral
+{
+public:
+	static float GetATanOfXY(float x, float y){
+		if(x == 0.0f && y == 0.0f)
+			return 0.0f;
+		float xabs = fabs(x);
+		float yabs = fabs(y);
+
+		if(xabs < yabs){
+			if(y > 0.0f){
+				if(x > 0.0f)
+					return 0.5f*PI - atan2(x / y, 1.0f);
+				else
+					return 0.5f*PI + atan2(-x / y, 1.0f);
+			}else{
+				if(x > 0.0f)
+					return 1.5f*PI + atan2(x / -y, 1.0f);
+				else
+					return 1.5f*PI - atan2(-x / -y, 1.0f);
+			}
+		}else{
+			if(y > 0.0f){
+				if(x > 0.0f)
+					return atan2(y / x, 1.0f);
+				else
+					return PI - atan2(y / -x, 1.0f);
+			}else{
+				if(x > 0.0f)
+					return 2.0f*PI - atan2(-y / x, 1.0f);
+				else
+					return PI + atan2(-y / -x, 1.0f);
+			}
+		}
+	}
+
+	static float LimitRadianAngle(float angle)
+	{
+		float result;
+
+		if (angle < -25.0f)
+			result = -25.0f;
+		else if (angle > 25.0f)
+			result = 25.0f;
+		else
+			result = angle;
+
+		while (result >= PI) {
+			result -= 2 * PI;
+		}
+
+		while (result < -PI) {
+			result += 2 * PI;
+		}
+	
+		return result;
+	}
+
+	static float GetRadianAngleBetweenPoints(float x1, float y1, float x2, float y2)
+	{
+		float x = x2 - x1;
+		float y = y2 - y1;
+
+		if (y == 0.0f)
+			y = 0.0001f;
+
+		if (x > 0.0f) {
+			if (y > 0.0f)
+				return PI - atan2(x / y, 1.0f);
+			else
+				return -atan2(x / y, 1.0f);
+		} else {
+			if (y > 0.0f)
+				return -(PI + atan2(x / y, 1.0f));
+			else
+				return -atan2(x / y, 1.0f);
+		}
+	}
+
+	// not too sure about all these...
+	static uint16 GetRandomNumber(void)
+		{ return myrand() & MYRAND_MAX; }
+	// Probably don't want to ever reach high
+	static float GetRandomNumberInRange(float low, float high)
+		{ return low + (high - low)*(GetRandomNumber()/float(MYRAND_MAX + 1)); }
+		
+	static int32 GetRandomNumberInRange(int32 low, int32 high)
+		{ return low + (high - low)*(GetRandomNumber()/float(MYRAND_MAX + 1)); }
+};