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#pragma once
class CVector2D
{
public:
float x, y;
CVector2D(void) {}
CVector2D(float x, float y) : x(x), y(y) {}
CVector2D(const CVector &v) : x(v.x), y(v.y) {}
float Heading(void) const { return Atan2(-x, y); }
float Magnitude(void) const { return Sqrt(x*x + y*y); }
float MagnitudeSqr(void) const { return x*x + y*y; }
void Normalise(void){
float sq = MagnitudeSqr();
if(sq > 0.0f){
float invsqrt = 1.0f/Sqrt(sq);
x *= invsqrt;
y *= invsqrt;
}else
x = 0.0f;
}
CVector2D operator-(const CVector2D &rhs) const {
return CVector2D(x-rhs.x, y-rhs.y);
}
CVector2D operator+(const CVector2D &rhs) const {
return CVector2D(x+rhs.x, y+rhs.y);
}
CVector2D operator*(float t) const {
return CVector2D(x*t, y*t);
}
};
inline float
DotProduct2D(const CVector2D &v1, const CVector2D &v2)
{
return v1.x*v2.x + v1.y*v2.y;
}
inline float
CrossProduct2D(const CVector2D &v1, const CVector2D &v2)
{
return v1.x*v2.y - v1.y*v2.x;
}
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