D:/VC++/Info. Vis/infovis/infovis/Circle.h

#ifndef CIRCLE_H
#define CIRCLE_H
#define _USE_MATH_DEFINES
#include <math.h>
#include "Vertex.h"
#include "geoshape.h"

class Circle : public GeoShape
{
public:

        Circle( float x, float y, float radius ): GeoShape( GeoShape::CIRCLE,x,y,radius  )
        {
                for(int i=0; i<20; i++)
                {
                        float radian = 2* M_PI* i/20;
                        float x_coord = radius * sin(radian) + x;
                        float y_coord = radius * cos(radian) + y;

                        mVertices[i] = Vertex(x_coord, y_coord); // Save the vertex positon into the array
                }

                GeoShape::mVertices = mVertices;
                GeoShape::mNumVertices = 20;
        }

        ~Circle( void ) {}

    Vertex mVertices[20];  // 20 vertex with equal step on the circumference
};

#endif