project_pt_pt()

int project_pt_pt	(	const POINT4D *	A,
		const POINT4D *	B,
		double	distance,
		POINT4D *	R
	)

Azimuth is angle in radians from vertical axis.

Definition at line 2546 of file measures.c.

{
        /* Convert from azimuth to conventional slope */
        double len = distance2d_pt_pt((const POINT2D *)A, (const POINT2D *)B);
        double prop = distance / len;
        double dx = (B->x - A->x) * prop;
        double dy = (B->y - A->y) * prop;
        double dz = (B->z - A->z) * prop;
        double dm = (B->m - A->m) * prop;
        R->x = B->x + dx;
        R->y = B->y + dy;
        if (isfinite(dz)) R->z = B->z + dz;
        if (isfinite(dm)) R->m = B->m + dm;
        return LW_TRUE;
}

References distance(), distance2d_pt_pt(), if(), LW_TRUE, POINT4D::m, POINT4D::x, POINT4D::y, and POINT4D::z.

Referenced by lwline_extend(), and lwpoint_project_lwpoint().

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