ptarray_scale()

void ptarray_scale	(	POINTARRAY *	pa,
		const POINT4D *	fact
	)

WARNING, make sure you send in only 16-member double arrays or obviously things will go pear-shaped fast.

Scale a pointarray.

Definition at line 1945 of file ptarray.c.

{
        uint32_t i;
        POINT4D p4d;
        LWDEBUG(3, "ptarray_scale start");
        for (i=0; i<pa->npoints; i++)
        {
                getPoint4d_p(pa, i, &p4d);
                p4d.x *= fact->x;
                p4d.y *= fact->y;
                p4d.z *= fact->z;
                p4d.m *= fact->m;
                ptarray_set_point4d(pa, i, &p4d);
        }
        LWDEBUG(3, "ptarray_scale end");
}

References getPoint4d_p(), LWDEBUG, POINT4D::m, POINTARRAY::npoints, ptarray_set_point4d(), POINT4D::x, POINT4D::y, and POINT4D::z.

Referenced by lwgeom_scale(), and test_ptarray_scale().

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