hexagon()

static LWGEOM * hexagon ( double  origin_x, double  origin_y, double  size, int  cell_i, int  cell_j, int32_t  srid  )

static

Definition at line 74 of file lwgeom_generate_grid.c.

{
        POINTARRAY **ppa = lwalloc(sizeof(POINTARRAY*));
        POINTARRAY *pa = ptarray_construct(0, 0, 7);
 
        for (uint32_t i = 0; i < 7; ++i)
        {
                double height = size * 2 * H;
                POINT4D pt;
                pt.x = origin_x + size * (1.5 * cell_i + hex_x[i]);
                pt.y = origin_y + height * (cell_j + 0.5 * (abs(cell_i) % 2) + hex_y[i]);
                ptarray_set_point4d(pa, i, &pt);
        }
 
        ppa[0] = pa;
        return lwpoly_as_lwgeom(lwpoly_construct(srid, NULL, 1 /* nrings */, ppa));
}

References H, hex_x, hex_y, lwalloc(), lwpoly_as_lwgeom(), lwpoly_construct(), ptarray_construct(), ptarray_set_point4d(), POINT4D::x, and POINT4D::y.

Referenced by ST_Hexagon(), and ST_ShapeGrid().

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