PostGIS  2.3.8dev-r@@SVN_REVISION@@

◆ ptarray_affine()

void ptarray_affine ( POINTARRAY pa,
const AFFINE affine 
)

Affine transform a pointarray.

Definition at line 1753 of file ptarray.c.

References AFFINE::afac, AFFINE::bfac, AFFINE::cfac, AFFINE::dfac, AFFINE::efac, AFFINE::ffac, POINTARRAY::flags, FLAGS_GET_Z, getPoint4d_p(), AFFINE::gfac, AFFINE::hfac, AFFINE::ifac, LWDEBUG, LWDEBUGF, POINTARRAY::npoints, ptarray_set_point4d(), pixval::x, POINT4D::x, AFFINE::xoff, pixval::y, POINT4D::y, AFFINE::yoff, POINT4D::z, and AFFINE::zoff.

Referenced by lwgeom_affine().

1754 {
1755  int i;
1756  double x,y,z;
1757  POINT4D p4d;
1758 
1759  LWDEBUG(2, "lwgeom_affine_ptarray start");
1760 
1761  if ( FLAGS_GET_Z(pa->flags) )
1762  {
1763  LWDEBUG(3, " has z");
1764 
1765  for (i=0; i<pa->npoints; i++)
1766  {
1767  getPoint4d_p(pa, i, &p4d);
1768  x = p4d.x;
1769  y = p4d.y;
1770  z = p4d.z;
1771  p4d.x = a->afac * x + a->bfac * y + a->cfac * z + a->xoff;
1772  p4d.y = a->dfac * x + a->efac * y + a->ffac * z + a->yoff;
1773  p4d.z = a->gfac * x + a->hfac * y + a->ifac * z + a->zoff;
1774  ptarray_set_point4d(pa, i, &p4d);
1775 
1776  LWDEBUGF(3, " POINT %g %g %g => %g %g %g", x, y, z, p4d.x, p4d.y, p4d.z);
1777  }
1778  }
1779  else
1780  {
1781  LWDEBUG(3, " doesn't have z");
1782 
1783  for (i=0; i<pa->npoints; i++)
1784  {
1785  getPoint4d_p(pa, i, &p4d);
1786  x = p4d.x;
1787  y = p4d.y;
1788  p4d.x = a->afac * x + a->bfac * y + a->xoff;
1789  p4d.y = a->dfac * x + a->efac * y + a->yoff;
1790  ptarray_set_point4d(pa, i, &p4d);
1791 
1792  LWDEBUGF(3, " POINT %g %g => %g %g", x, y, p4d.x, p4d.y);
1793  }
1794  }
1795 
1796  LWDEBUG(3, "lwgeom_affine_ptarray end");
1797 
1798 }
void ptarray_set_point4d(POINTARRAY *pa, int n, const POINT4D *p4d)
Definition: lwgeom_api.c:549
double x
Definition: liblwgeom.h:351
int npoints
Definition: liblwgeom.h:370
#define LWDEBUG(level, msg)
Definition: lwgeom_log.h:83
uint8_t flags
Definition: liblwgeom.h:368
#define FLAGS_GET_Z(flags)
Macros for manipulating the &#39;flags&#39; byte.
Definition: liblwgeom.h:139
double z
Definition: liblwgeom.h:351
double y
Definition: liblwgeom.h:351
#define LWDEBUGF(level, msg,...)
Definition: lwgeom_log.h:88
int getPoint4d_p(const POINTARRAY *pa, int n, POINT4D *point)
Definition: lwgeom_api.c:244
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