PostGIS  2.5.0dev-r@@SVN_REVISION@@

◆ ptarray_affine()

void ptarray_affine ( POINTARRAY pa,
const AFFINE affine 
)

Affine transform a pointarray.

Definition at line 1789 of file ptarray.c.

References AFFINE::afac, AFFINE::bfac, AFFINE::cfac, det(), AFFINE::dfac, AFFINE::efac, AFFINE::ffac, POINTARRAY::flags, FLAGS_GET_Z, getPoint4d_p(), AFFINE::gfac, AFFINE::hfac, AFFINE::ifac, LW_FALSE, LW_TRUE, 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().

1790 {
1791  uint32_t i;
1792  double x,y,z;
1793  POINT4D p4d;
1794 
1795  LWDEBUG(2, "lwgeom_affine_ptarray start");
1796 
1797  if ( FLAGS_GET_Z(pa->flags) )
1798  {
1799  LWDEBUG(3, " has z");
1800 
1801  for (i=0; i<pa->npoints; i++)
1802  {
1803  getPoint4d_p(pa, i, &p4d);
1804  x = p4d.x;
1805  y = p4d.y;
1806  z = p4d.z;
1807  p4d.x = a->afac * x + a->bfac * y + a->cfac * z + a->xoff;
1808  p4d.y = a->dfac * x + a->efac * y + a->ffac * z + a->yoff;
1809  p4d.z = a->gfac * x + a->hfac * y + a->ifac * z + a->zoff;
1810  ptarray_set_point4d(pa, i, &p4d);
1811 
1812  LWDEBUGF(3, " POINT %g %g %g => %g %g %g", x, y, z, p4d.x, p4d.y, p4d.z);
1813  }
1814  }
1815  else
1816  {
1817  LWDEBUG(3, " doesn't have z");
1818 
1819  for (i=0; i<pa->npoints; i++)
1820  {
1821  getPoint4d_p(pa, i, &p4d);
1822  x = p4d.x;
1823  y = p4d.y;
1824  p4d.x = a->afac * x + a->bfac * y + a->xoff;
1825  p4d.y = a->dfac * x + a->efac * y + a->yoff;
1826  ptarray_set_point4d(pa, i, &p4d);
1827 
1828  LWDEBUGF(3, " POINT %g %g => %g %g", x, y, p4d.x, p4d.y);
1829  }
1830  }
1831 
1832  LWDEBUG(3, "lwgeom_affine_ptarray end");
1833 
1834 }
double x
Definition: liblwgeom.h:354
void ptarray_set_point4d(POINTARRAY *pa, uint32_t n, const POINT4D *p4d)
Definition: lwgeom_api.c:425
#define LWDEBUG(level, msg)
Definition: lwgeom_log.h:83
unsigned int uint32_t
Definition: uthash.h:78
uint8_t flags
Definition: liblwgeom.h:371
#define FLAGS_GET_Z(flags)
Macros for manipulating the &#39;flags&#39; byte.
Definition: liblwgeom.h:139
double z
Definition: liblwgeom.h:354
int getPoint4d_p(const POINTARRAY *pa, uint32_t n, POINT4D *point)
Definition: lwgeom_api.c:113
double y
Definition: liblwgeom.h:354
#define LWDEBUGF(level, msg,...)
Definition: lwgeom_log.h:88
uint32_t npoints
Definition: liblwgeom.h:373
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