mirror of
https://git.osgeo.org/gitea/postgis/postgis
synced 2024-10-25 09:32:46 +00:00
62 lines
1.1 KiB
C
62 lines
1.1 KiB
C
#include <stdio.h>
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#include <string.h>
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#include "liblwgeom.h"
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POINTARRAY *
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ptarray_construct(char hasz, char hasm, unsigned int npoints)
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{
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unsigned char dims = 0;
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size_t size;
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char *ptlist;
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POINTARRAY *pa;
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TYPE_SETZM(dims, hasz?1:0, hasm?1:0);
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size = TYPE_NDIMS(dims)*npoints*sizeof(double);
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ptlist = (char *)lwalloc(size);
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pa = lwalloc(sizeof(POINTARRAY));
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pa->dims = dims;
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pa->serialized_pointlist = ptlist;
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pa->npoints = npoints;
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return pa;
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}
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POINTARRAY *
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ptarray_construct2d(uint32 npoints, const POINT2D *pts)
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{
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POINTARRAY *pa = ptarray_construct(0, 0, npoints);
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uint32 i;
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for (i=0; i<npoints; i++)
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{
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POINT2D *pap = (POINT2D *)getPoint(pa, i);
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pap->x = pts[i].x;
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pap->y = pts[i].y;
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}
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return pa;
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}
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void
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ptarray_reverse(POINTARRAY *pa)
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{
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POINT4D pbuf;
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uint32 i;
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int ptsize = pointArray_ptsize(pa);
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int last = pa->npoints-1;
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int mid = last/2;
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for (i=0; i<=mid; i++)
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{
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char *from, *to;
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from = getPoint(pa, i);
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to = getPoint(pa, (last-i));
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memcpy((char *)&pbuf, to, ptsize);
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memcpy(to, from, ptsize);
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memcpy(from, (char *)&pbuf, ptsize);
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}
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}
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