assimp/include/aiVector2D.h

/*
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Open Asset Import Library (ASSIMP)
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Copyright (c) 2006-2008, ASSIMP Development Team

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  derived from this software without specific prior
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*/
/** @file aiVector2D.h
 *  @brief 2D vector structure, including operators when compiling in C++
 */
#ifndef AI_VECTOR2D_H_INC
#define AI_VECTOR2D_H_INC

#include <math.h>

#ifdef __cplusplus
extern "C" {
#endif

#include "./Compiler/pushpack1.h"

// ----------------------------------------------------------------------------------
/** Represents a two-dimensional vector. 
 */
struct aiVector2D
{
#ifdef __cplusplus
	aiVector2D () : x(0.0f), y(0.0f) {}
	aiVector2D (float _x, float _y) : x(_x), y(_y) {}
	aiVector2D (float _xyz) : x(_xyz), y(_xyz) {}
	aiVector2D (const aiVector2D& o) : x(o.x), y(o.y) {}

	void Set( float pX, float pY) { 
		x = pX; y = pY;
	}
	
	float SquareLength() const {
		return x*x + y*y; 
	}
	
	float Length() const {
		return ::sqrt( SquareLength());
	}

	aiVector2D& Normalize() { 
		*this /= Length(); return *this;
	}

	const aiVector2D& operator += (const aiVector2D& o) {
		x += o.x; y += o.y;  return *this; 
	}
	const aiVector2D& operator -= (const aiVector2D& o) {
		x -= o.x; y -= o.y;  return *this; 
	}
	const aiVector2D& operator *= (float f) { 
		x *= f; y *= f;  return *this; 
	}
	const aiVector2D& operator /= (float f) {
		x /= f; y /= f;  return *this; 
	}

	float operator[](unsigned int i) const {
		return *(&x + i);
	}

	float& operator[](unsigned int i) {
		return *(&x + i);
	}

	bool operator== (const aiVector2D& other) const {
		return x == other.x && y == other.y;
	}

	bool operator!= (const aiVector2D& other) const {
		return x != other.x || y != other.y;
	}

	aiVector2D& operator= (float f)	{
		x = y = f;return *this;
	}

	const aiVector2D SymMul(const aiVector2D& o) {
		return aiVector2D(x*o.x,y*o.y);
	}

#endif // __cplusplus

	float x, y;	
} PACK_STRUCT;

#include "./Compiler/poppack1.h"

#ifdef __cplusplus
} // end extern "C"

// ----------------------------------------------------------------------------------
// symmetric addition
inline aiVector2D operator + (const aiVector2D& v1, const aiVector2D& v2)
{
	return aiVector2D( v1.x + v2.x, v1.y + v2.y);
}

// ----------------------------------------------------------------------------------
// symmetric subtraction
inline aiVector2D operator - (const aiVector2D& v1, const aiVector2D& v2)
{
	return aiVector2D( v1.x - v2.x, v1.y - v2.y);
}

// ----------------------------------------------------------------------------------
// scalar product
inline float operator * (const aiVector2D& v1, const aiVector2D& v2)
{
	return v1.x*v2.x + v1.y*v2.y;
}

// ----------------------------------------------------------------------------------
// scalar multiplication
inline aiVector2D operator * ( float f, const aiVector2D& v)
{
	return aiVector2D( f*v.x, f*v.y);
}

// ----------------------------------------------------------------------------------
// and the other way around
inline aiVector2D operator * ( const aiVector2D& v, float f)
{
	return aiVector2D( f*v.x, f*v.y);
}

// ----------------------------------------------------------------------------------
// scalar division
inline aiVector2D operator / ( const aiVector2D& v, float f)
{
	
	return v * (1/f);
}

// ----------------------------------------------------------------------------------
// vector division
inline aiVector2D operator / ( const aiVector2D& v, const aiVector2D& v2)
{
	return aiVector2D(v.x / v2.x,v.y / v2.y);
}

// ----------------------------------------------------------------------------------
// vector inversion
inline aiVector2D operator - ( const aiVector2D& v)
{
	return aiVector2D( -v.x, -v.y);
}

#endif // __cplusplus
#endif // AI_VECTOR2D_H_INC