1 files changed, 171 insertions, 0 deletions
diff --git a/src/core/General.h b/src/core/General.h
new file mode 100644
index 0000000..2f205c3
--- /dev/null
+++ b/src/core/General.h
@@ -0,0 +1,171 @@
+#pragma once
+
+#include <ctype.h>
+
+class CGeneral
+{
+public:
+	static float GetATanOfXY(float x, float y){
+		if(x == 0.0f && y == 0.0f)
+			return 0.0f;
+		float xabs = Abs(x);
+		float yabs = Abs(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 LimitAngle(float angle)
+	{
+		float result = angle;
+
+		while (result >= 180.0f) {
+			result -= 2 * 180.0f;
+		}
+
+		while (result < -180.0f) {
+			result += 2 * 180.0f;
+		}
+
+		return result;
+	}
+
+
+	static float LimitRadianAngle(float angle)
+	{
+		float result = clamp(angle, -25.0f, 25.0f);
+
+		while (result >= PI) {
+			result -= 2 * PI;
+		}
+
+		while (result < -PI) {
+			result += 2 * PI;
+		}
+	
+		return result;
+	}
+
+	// Returns an angle such that x2/y2 looks at x1/y1 with its forward vector if rotated by that angle
+	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);
+		}
+	}
+	
+	static float GetAngleBetweenPoints(float x1, float y1, float x2, float y2)
+	{
+		return RADTODEG(GetRadianAngleBetweenPoints(x1, y1, x2, y2));
+	}
+
+	// should return direction in 0-8 range. fits perfectly to peds' path directions.
+	static int GetNodeHeadingFromVector(float x, float y)
+	{
+		float angle = CGeneral::GetRadianAngleBetweenPoints(x, y, 0.0f, 0.0f);
+		if (angle < 0.0f)
+			angle += TWOPI;
+
+		angle = DEGTORAD(22.5f) + TWOPI - angle;
+
+		if (angle >= TWOPI)
+			angle -= TWOPI;
+
+		return (int)Floor(angle / DEGTORAD(45.0f));
+	}
+
+	// Unlike usual string comparison functions, these don't care about greater or lesser
+	static bool faststrcmp(const char *str1, const char *str2)
+	{
+		for (; *str1; str1++, str2++) {
+			if (*str1 != *str2)
+				return true;
+		}
+		return *str2 != '\0';
+	}
+
+	static bool faststrncmp(const char *str1, const char *str2, uint32 count)
+	{
+		for(uint32 i = 0; *str1 && i < count; str1++, str2++, i++) {
+			if (*str1 != *str2)
+				return true;
+		}
+		return false;
+	}
+
+	static bool faststricmp(const char *str1, const char *str2)
+	{
+		for (; *str1; str1++, str2++) {
+#ifndef ASCII_STRCMP
+			if (toupper(*str1) != toupper(*str2))
+#else
+			if (__ascii_toupper(*str1) != __ascii_toupper(*str2))
+#endif
+				return true;
+		}
+		return *str2 != '\0';
+	}
+
+	static bool SolveQuadratic(float a, float b, float c, float &root1, float &root2)
+	{
+		float discriminant = b * b - 4.f * a * c;
+		if (discriminant < 0.f)
+			return false;
+
+		float discriminantSqrt = Sqrt(discriminant);
+		root2 = (-b + discriminantSqrt) / (2.f * a);
+		root1 = (-b - discriminantSqrt) / (2.f * a);
+		return true;
+	}
+
+	// not too sure about all these...
+	static uint16 GetRandomNumber(void)
+		{ return myrand() & MYRAND_MAX; }
+	static bool GetRandomTrueFalse(void)
+		{ return GetRandomNumber() < MYRAND_MAX / 2; }
+	// 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)); }
+	static void SetRandomSeed(int32 seed)
+		{ mysrand(seed); }
+};