pointArray_to_geojson()

static size_t pointArray_to_geojson ( POINTARRAY *  pa, char *  buf, int  precision  )

static

Definition at line 713 of file lwout_geojson.c.

References BUFSIZE, POINTARRAY::flags, FLAGS_GET_Z, getPoint2d_cp(), getPoint3dz_cp(), lwprint_double(), POINTARRAY::npoints, OUT_MAX_DOUBLE_PRECISION, trim_trailing_zeros(), pixval::x, POINT2D::x, POINT3DZ::x, pixval::y, POINT2D::y, POINT3DZ::y, and POINT3DZ::z.

Referenced by asgeojson_line_buf(), asgeojson_multiline_buf(), asgeojson_multipoint_buf(), asgeojson_multipolygon_buf(), asgeojson_point_buf(), and asgeojson_poly_buf().

{
        int i;
        char *ptr;
#define BUFSIZE OUT_MAX_DIGS_DOUBLE+OUT_MAX_DOUBLE_PRECISION
        char x[BUFSIZE+1];
        char y[BUFSIZE+1];
        char z[BUFSIZE+1];

        assert ( precision <= OUT_MAX_DOUBLE_PRECISION );

  /* Ensure a terminating NULL at the end of buffers
   * so that we don't need to check for truncation
   * inprint_double */
  x[BUFSIZE] = '\0';
  y[BUFSIZE] = '\0';
  z[BUFSIZE] = '\0';

        ptr = output;

  /* TODO: rewrite this loop to be simpler and possibly quicker */
        if (!FLAGS_GET_Z(pa->flags))
        {
                for (i=0; i<pa->npoints; i++)
                {
                        const POINT2D *pt;
                        pt = getPoint2d_cp(pa, i);

                        lwprint_double(pt->x, precision, x, BUFSIZE);
                        trim_trailing_zeros(x);
                        lwprint_double(pt->y, precision, y, BUFSIZE);
                        trim_trailing_zeros(y);

                        if ( i ) ptr += sprintf(ptr, ",");
                        ptr += sprintf(ptr, "[%s,%s]", x, y);
                }
        }
        else
        {
                for (i=0; i<pa->npoints; i++)
                {
                        const POINT3DZ *pt;
                        pt = getPoint3dz_cp(pa, i);

                        lwprint_double(pt->x, precision, x, BUFSIZE);
                        trim_trailing_zeros(x);
                        lwprint_double(pt->y, precision, y, BUFSIZE);
                        trim_trailing_zeros(y);
                        lwprint_double(pt->z, precision, z, BUFSIZE);
                        trim_trailing_zeros(z);

                        if ( i ) ptr += sprintf(ptr, ",");
                        ptr += sprintf(ptr, "[%s,%s,%s]", x, y, z);
                }
        }

        return (ptr-output);
}

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