lwpoint_get_ordinate()

double lwpoint_get_ordinate	(	const POINT4D *	p,
		char	ordinate
	)

Given a POINT4D and an ordinate number, return the value of the ordinate.

Parameters

p	input point
ordinate	number (1=x, 2=y, 3=z, 4=m)

Returns

d value at that ordinate

Definition at line 251 of file lwlinearreferencing.c.

References lwerror(), POINT4D::m, POINT4D::x, POINT4D::y, and POINT4D::z.

Referenced by lwline_clip_to_ordinate_range(), lwmpoint_clip_to_ordinate_range(), lwpoint_clip_to_ordinate_range(), point_interpolate(), and test_lwpoint_get_ordinate().

{
        if ( ! p )
        {
                lwerror("Null input geometry.");
                return 0.0;
        }

        if ( ! ( ordinate == 'X' || ordinate == 'Y' || ordinate == 'Z' || ordinate == 'M' ) )
        {
                lwerror("Cannot extract %c ordinate.", ordinate);
                return 0.0;
        }

        if ( ordinate == 'X' )
                return p->x;
        if ( ordinate == 'Y' )
                return p->y;
        if ( ordinate == 'Z' )
                return p->z;
        if ( ordinate == 'M' )
                return p->m;

        /* X */
        return p->x;

}

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