izanami-game-2022-old/src/packages/game/math/IZ_vector.h

#ifndef IZ_VECTOR_H
#define IZ_VECTOR_H

#include "IZ_math.h"

typedef struct {
	// positive X is rightwards
	IZ_Real x;

	// positive Y is downwards
	IZ_Real y;
} IZ_Vector;

inline IZ_Vector IZ_VectorAdd(IZ_Vector a, IZ_Vector b) {
	return (IZ_Vector) {
		.x = a.x + b.x,
		.y = a.y + b.y,
	};
}

inline IZ_Vector IZ_VectorSubtract(IZ_Vector a, IZ_Vector b) {
	return (IZ_Vector) {
		.x = a.x - b.x,
		.y = a.y - b.y,
	};
}

inline IZ_Vector IZ_VectorMultiply(IZ_Vector a, IZ_Real b) {
	return (IZ_Vector) {
		.x = a.x * b,
		.y = a.y * b,
	};
}

inline IZ_Vector IZ_VectorDivide(IZ_Vector a, IZ_Real b) {
	return (IZ_Vector) {
		.x = a.x / b,
		.y = a.y / b,
	};
}

inline IZ_Real IZ_VectorDot(IZ_Vector a, IZ_Vector b) {
	return a.x * b.x + a.y * b.y;
}

inline IZ_Real IZ_VectorDistance(IZ_Vector a, IZ_Vector b) {
	IZ_Real x = b.x - a.x;
	IZ_Real y = b.y - a.y;
	return IZ_Sqrt(x * x + y * y);
}

#endif //IZ_VECTOR_H