c2dvector.h

本程序模拟细胞的自我繁殖

// --- C2dVector.h ----------------------------------------------

#pragma once

#if !defined(C2DVECTOR)
#define C2DVECTOR 1

/// A simple class to manage a 2D point/vector, with coordinates (x,y)
class C2dVector
{
	public:

		// data members
		float x,y;

	public:

		// default constructor
		C2dVector(float a=0.0F,float b=0.0F);

		// alternative constructors
		C2dVector(int a,int b);
		C2dVector(CPoint p);

		// copy constructor
		C2dVector(const C2dVector& v);

		// overloaded unary operators
		C2dVector& operator=(const C2dVector& v);
		C2dVector& operator+=(const C2dVector& v);
		C2dVector& operator-=(const C2dVector& v);
		C2dVector& operator*=(float f);
		C2dVector& operator/=(float f);
		BOOL operator==(const C2dVector& v) const
			{ return((x==v.x)&&(y==v.y)); }
		BOOL operator!=(const C2dVector& v) const
			{ return((x!=v.x)||(y!=v.y)); }
		C2dVector operator-();

		CPoint Point() { return CPoint((int)x,(int)y); }
		void RotateAround(const C2dVector& c,float deg);
		C2dVector Normalize();

        // some operators encoded for speed
        void Mult(float f)
        {
            this->x *= f;
            this->y *= f;
        }
        void Add(const C2dVector& b)
        {
            this->x += b.x;
            this->y += b.y;
        }
        void Subtract(const C2dVector& b)
        {
            this->x -= b.x;
            this->y -= b.y;
        }
        static float Dist2(const C2dVector& a,const C2dVector& b);

		// overloaded binary operators
		friend C2dVector operator*(const C2dVector& a,float f);
		friend C2dVector operator*(float f,const C2dVector& a);
		friend C2dVector operator/(const C2dVector& a,float f);
		friend C2dVector operator/(float f,const C2dVector& a);
		friend C2dVector operator+(const C2dVector& a,const C2dVector& b);
		friend C2dVector operator-(const C2dVector& a,const C2dVector& b);
		friend float Length(const C2dVector& v);
		friend float Length2(const C2dVector& v);
		friend float DotProduct(const C2dVector& a,const C2dVector& b);
		friend C2dVector Normalized(const C2dVector& a);
};

#endif

//-----------------------------------------------------------