[SFML 2.X] Marching Squares - Zaokrąglone kafelki mapy

class Terrain
    : public sf::Drawable
    , public sf::Transformable
{
public:
    short width, height;
    sf::Vector2i coords;
   
    sf::VertexArray vertexes;
    sf::Texture tileset;
   
    std::vector < short > tiles;
   
    Terrain( short x, short y, short width, short height ) {
       
        coords.x = x;
        coords.y = y;
       
        this->width = width;
        this->height = height;
       
        tileset = sf::Texture();
        tileset = * getTexture( "tiles/0_tileset" )->texture;
       
       
       
        vertexes.setPrimitiveType( sf::Triangles );
        vertexes.resize( width * height * 6 ); // widthMap * heightMap * TwoTrianglesVertices
       
        tiles.resize( width * height );
       
        short coord_x, coord_y;
       
        // TERRAIN - GRASS
        for( short y = 0; y < height; y++ )
        for( short x = 0; x < width; x++ ) {
           
            sf::Vertex * triangles = & vertexes[( y * width + x ) * 6 ];
           
            coord_x =( coords.x + x );
            coord_y =( coords.y + y );
           
            triangles[ 0 ].position = sf::Vector2f( coord_x * tileSide, coord_y * tileSide );
            triangles[ 1 ].position = sf::Vector2f(( coord_x + 1 ) * tileSide, coord_y * tileSide );
            triangles[ 2 ].position = sf::Vector2f( coord_x * tileSide,( coord_y + 1 ) * tileSide );
            triangles[ 3 ].position = sf::Vector2f( coord_x * tileSide,( coord_y + 1 ) * tileSide );
            triangles[ 4 ].position = sf::Vector2f(( coord_x + 1 ) * tileSide, coord_y * tileSide );
            triangles[ 5 ].position = sf::Vector2f(( coord_x + 1 ) * tileSide,( coord_y + 1 ) * tileSide );
           
            edit( x, y, 0 );
        }
       
       
    }
   
    void edit( short x, short y, short value ) {
       
        if( x < 0 || x >= width || y < 0 || y >= height )
             return;
       
        if( value > 3 || value < 0 )
             return;
       
        tiles[ y * width + x ] = value;
       
        short global_x = coords.x + x;
        short global_y = coords.y + y;
       
        sf::Vertex * triangles = & vertexes[( y * width + x ) * 6 ];
       
        short tu =( short( global_x * tileSide ) % 64 ) +( value * 64 );
        short tv =( short( global_y * tileSide ) % 64 );
       
        //cout << "tu: " << tu << ", tv: " << tv << "\n";
       
        triangles[ 0 ].texCoords = sf::Vector2f( tu, tv );
        triangles[ 1 ].texCoords = sf::Vector2f( tu + tileSide, tv );
        triangles[ 2 ].texCoords = sf::Vector2f( tu, tv + tileSide );
        triangles[ 3 ].texCoords = sf::Vector2f( tu, tv + tileSide );
        triangles[ 4 ].texCoords = sf::Vector2f( tu + tileSide, tv );
        triangles[ 5 ].texCoords = sf::Vector2f( tu + tileSide, tv + tileSide );
    }
   
private:
   
    virtual void draw( sf::RenderTarget & target, sf::RenderStates states ) const
    {
       
        // draw tiles - terrain
        states.transform *= getTransform();
        states.texture = & tileset; // TO-DO
        target.draw( vertexes, states );
    }
};