PostGIS  2.4.9dev-r@@SVN_REVISION@@

◆ ptarray_affine()

void ptarray_affine ( POINTARRAY pa,
const AFFINE affine 
)

Affine transform a pointarray.

Definition at line 1800 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().

1801 {
1802  int i;
1803  double x,y,z;
1804  POINT4D p4d;
1805 
1806  LWDEBUG(2, "lwgeom_affine_ptarray start");
1807 
1808  if ( FLAGS_GET_Z(pa->flags) )
1809  {
1810  LWDEBUG(3, " has z");
1811 
1812  for (i=0; i<pa->npoints; i++)
1813  {
1814  getPoint4d_p(pa, i, &p4d);
1815  x = p4d.x;
1816  y = p4d.y;
1817  z = p4d.z;
1818  p4d.x = a->afac * x + a->bfac * y + a->cfac * z + a->xoff;
1819  p4d.y = a->dfac * x + a->efac * y + a->ffac * z + a->yoff;
1820  p4d.z = a->gfac * x + a->hfac * y + a->ifac * z + a->zoff;
1821  ptarray_set_point4d(pa, i, &p4d);
1822 
1823  LWDEBUGF(3, " POINT %g %g %g => %g %g %g", x, y, z, p4d.x, p4d.y, p4d.z);
1824  }
1825  }
1826  else
1827  {
1828  LWDEBUG(3, " doesn't have z");
1829 
1830  for (i=0; i<pa->npoints; i++)
1831  {
1832  getPoint4d_p(pa, i, &p4d);
1833  x = p4d.x;
1834  y = p4d.y;
1835  p4d.x = a->afac * x + a->bfac * y + a->xoff;
1836  p4d.y = a->dfac * x + a->efac * y + a->yoff;
1837  ptarray_set_point4d(pa, i, &p4d);
1838 
1839  LWDEBUGF(3, " POINT %g %g => %g %g", x, y, p4d.x, p4d.y);
1840  }
1841  }
1842 
1843  LWDEBUG(3, "lwgeom_affine_ptarray end");
1844 
1845 }
void ptarray_set_point4d(POINTARRAY *pa, int n, const POINT4D *p4d)
Definition: lwgeom_api.c:437
double x
Definition: liblwgeom.h:352
int npoints
Definition: liblwgeom.h:371
#define LWDEBUG(level, msg)
Definition: lwgeom_log.h:83
uint8_t flags
Definition: liblwgeom.h:369
#define FLAGS_GET_Z(flags)
Macros for manipulating the &#39;flags&#39; byte.
Definition: liblwgeom.h:140
double z
Definition: liblwgeom.h:352
double y
Definition: liblwgeom.h:352
#define LWDEBUGF(level, msg,...)
Definition: lwgeom_log.h:88
int getPoint4d_p(const POINTARRAY *pa, int n, POINT4D *point)
Definition: lwgeom_api.c:122
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