2D Rectangle Class in C++, includes collision detection (Header and CPP file)

Rectangle2D

#include "vector.h"
#include "circle.h"

using namespace std;


#ifndef RECTANGLE_H
#define RECTANGLE_H

class Rectangle2D{
  public:
	const int numPoints = 4;
	float width, height;
	gVector2 topLeft, rectPoints[4];

	Rectangle2D() : topLeft(0, 0), width(1), height(1){}
	Rectangle2D(gVector2 topL, float w, float h) : topLeft(topL), width(w), height(h){}	

	gVector2 GetTopRight()const{ return gVector2(topLeft.x + width, topLeft.y); }
	gVector2 GetBottomLeft()const{ return gVector2(topLeft.x, topLeft.y + height); }
	gVector2 GetBottomRight()const{ return gVector2(topLeft.x + width, topLeft.y + height); }

	float Area()const{ return width * height; }
	float Perimeter()const{ return 2 * Area(); }
	float Diagonal()const { return sqrt((width * width) + (height * height)); }

	void SetPoints();
	bool PointCollision(gVector2)const;
	bool RectCollision(Rectangle2D)const;
	bool CircleCollision(Circle2D);
};

#endif



#include "rectangle.h"

using namespace std;

void Rectangle2D::SetPoints(){
	rectPoints[0] = topLeft;
	rectPoints[1] = GetTopRight();
	rectPoints[2] = GetBottomLeft();
	rectPoints[3] = GetBottomRight();
}

bool Rectangle2D::PointCollision(gVector2 point)const{
	gVector2 max = GetBottomRight();
	return (point.x < max.x && point.x > topLeft.x &&
		point.y < max.y && point.y > topLeft.y);
}

bool Rectangle2D::RectCollision(Rectangle2D rectB)const{
	gVector2 maxA, maxB;
	maxA = GetBottomRight();
	maxB = rectB.GetBottomRight();
	return (rectB.topLeft.x < maxA.x &&
		maxB.y > topLeft.y);
}

bool Rectangle2D::CircleCollision(Circle2D circle){
	gVector2 point;
	SetPoints();
	for (int i = 0; i < numPoints; ++i){
		point = rectPoints[i];
		point.x = point.x - circle.center.x;
		point.x *= point.x;
		point.y = point.y - circle.center.y;
		point.y *= point.y;

		if (point.x + point.y < circle.radius * circle.radius){
			return true;
		}

	}
	return 0;
}