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

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

class Quad : public GeoShape
{
public:

        Quad( float x, float y, float radius ): GeoShape( GeoShape::TRIANGLE,x,y,radius )  // Radius is the distance from the center to one of the vertex
        {     
                mVertices[0] = Vertex(x+radius*sqrt(2.0)/2, y+radius*sqrt(2.0)/2);  // upper right
                mVertices[1] = Vertex(x-radius*sqrt(2.0)/2, y+radius*sqrt(2.0)/2);  // upper left
                mVertices[2] = Vertex(x-radius*sqrt(2.0)/2, y-radius*sqrt(2.0)/2);  // lower left
                mVertices[3] = Vertex(x+radius*sqrt(2.0)/2, y-radius*sqrt(2.0)/2);  // lower right

                GeoShape::mVertices = mVertices;
                GeoShape::mNumVertices = 4;
        }

        ~Quad( void ) {}

    Vertex mVertices[4];
};

#endif