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https://git.osgeo.org/gitea/postgis/postgis
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37e28e68c6
git-svn-id: http://svn.osgeo.org/postgis/trunk@7490 b70326c6-7e19-0410-871a-916f4a2858ee
1021 lines
25 KiB
C
1021 lines
25 KiB
C
/**********************************************************************
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* $Id$
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*
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* PostGIS - Spatial Types for PostgreSQL
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* http://postgis.refractions.net
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* Copyright 2001-2006 Refractions Research Inc.
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*
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* This is free software; you can redistribute and/or modify it under
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* the terms of the GNU General Public Licence. See the COPYING file.
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*
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**********************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <math.h>
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#include "liblwgeom_internal.h"
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LWMLINE *lwmcurve_segmentize(LWMCURVE *mcurve, uint32 perQuad);
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LWMPOLY *lwmsurface_segmentize(LWMSURFACE *msurface, uint32 perQuad);
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LWCOLLECTION *lwcollection_segmentize(LWCOLLECTION *collection, uint32 perQuad);
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LWGEOM *append_segment(LWGEOM *geom, POINTARRAY *pts, int type, int srid);
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LWGEOM *pta_desegmentize(POINTARRAY *points, int type, int srid);
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LWGEOM *lwline_desegmentize(LWLINE *line);
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LWGEOM *lwpolygon_desegmentize(LWPOLY *poly);
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LWGEOM *lwmline_desegmentize(LWMLINE *mline);
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LWGEOM *lwmpolygon_desegmentize(LWMPOLY *mpoly);
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LWGEOM *lwgeom_desegmentize(LWGEOM *geom);
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/*
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* Tolerance used to determine equality.
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*/
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#define EPSILON_SQLMM 1e-8
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/*
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* Determines (recursively in the case of collections) whether the geometry
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* contains at least on arc geometry or segment.
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*/
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int
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lwgeom_has_arc(const LWGEOM *geom)
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{
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LWCOLLECTION *col;
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int i;
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LWDEBUG(2, "lwgeom_has_arc called.");
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switch (geom->type)
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{
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case POINTTYPE:
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case LINETYPE:
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case POLYGONTYPE:
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case TRIANGLETYPE:
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case MULTIPOINTTYPE:
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case MULTILINETYPE:
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case MULTIPOLYGONTYPE:
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case POLYHEDRALSURFACETYPE:
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case TINTYPE:
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return LW_FALSE;
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case CIRCSTRINGTYPE:
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return LW_TRUE;
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/* It's a collection that MAY contain an arc */
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default:
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col = (LWCOLLECTION *)geom;
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for (i=0; i<col->ngeoms; i++)
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{
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if (lwgeom_has_arc(col->geoms[i]) == LW_TRUE)
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return LW_TRUE;
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}
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return LW_FALSE;
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}
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}
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/*
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* Determines the center of the circle defined by the three given points.
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* In the event the circle is complete, the midpoint of the segment defined
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* by the first and second points is returned. If the points are colinear,
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* as determined by equal slopes, then NULL is returned. If the interior
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* point is coincident with either end point, they are taken as colinear.
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*/
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double
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lwcircle_center(const POINT4D *p1, const POINT4D *p2, const POINT4D *p3, POINT4D *result)
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{
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POINT4D c;
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double cx, cy, cr;
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double temp, bc, cd, det;
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c.x = c.y = c.z = c.m = 0.0;
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LWDEBUGF(2, "lwcircle_center called (%.16f,%.16f), (%.16f,%.16f), (%.16f,%.16f).", p1->x, p1->y, p2->x, p2->y, p3->x, p3->y);
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/* Closed circle */
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if (fabs(p1->x - p3->x) < EPSILON_SQLMM &&
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fabs(p1->y - p3->y) < EPSILON_SQLMM)
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{
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cx = p1->x + (p2->x - p1->x) / 2.0;
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cy = p1->y + (p2->y - p1->y) / 2.0;
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c.x = cx;
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c.y = cy;
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*result = c;
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cr = sqrt(pow(cx - p1->x, 2.0) + pow(cy - p1->y, 2.0));
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return cr;
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}
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temp = p2->x*p2->x + p2->y*p2->y;
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bc = (p1->x*p1->x + p1->y*p1->y - temp) / 2.0;
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cd = (temp - p3->x*p3->x - p3->y*p3->y) / 2.0;
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det = (p1->x - p2->x)*(p2->y - p3->y)-(p2->x - p3->x)*(p1->y - p2->y);
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/* Check colinearity */
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if (fabs(det) < EPSILON_SQLMM)
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return -1.0;
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det = 1.0 / det;
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cx = (bc*(p2->y - p3->y)-cd*(p1->y - p2->y))*det;
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cy = ((p1->x - p2->x)*cd-(p2->x - p3->x)*bc)*det;
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c.x = cx;
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c.y = cy;
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*result = c;
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cr = sqrt((cx-p1->x)*(cx-p1->x)+(cy-p1->y)*(cy-p1->y));
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LWDEBUGF(2, "lwcircle_center center is (%.16f,%.16f)", result->x, result->y);
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return cr;
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}
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/*******************************************************************************
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* Begin curve segmentize functions
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******************************************************************************/
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static double interpolate_arc(double angle, double a1, double a2, double a3, double zm1, double zm2, double zm3)
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{
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LWDEBUGF(4,"angle %.05g a1 %.05g a2 %.05g a3 %.05g zm1 %.05g zm2 %.05g zm3 %.05g",angle,a1,a2,a3,zm1,zm2,zm3);
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/* Counter-clockwise sweep */
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if ( a1 < a2 )
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{
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if ( angle <= a2 )
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return zm1 + (zm2-zm1) * (angle-a1) / (a2-a1);
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else
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return zm2 + (zm3-zm2) * (angle-a2) / (a3-a2);
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}
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/* Clockwise sweep */
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else
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{
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if ( angle >= a2 )
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return zm1 + (zm2-zm1) * (a1-angle) / (a1-a2);
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else
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return zm2 + (zm3-zm2) * (a2-angle) / (a2-a3);
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}
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}
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static POINTARRAY *
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lwcircle_segmentize(POINT4D *p1, POINT4D *p2, POINT4D *p3, uint32 perQuad)
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{
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POINT4D center;
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POINT4D pt;
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int p2_side = 0;
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int clockwise = LW_TRUE;
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double radius; /* Arc radius */
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double increment; /* Angle per segment */
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double a1, a2, a3, angle;
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POINTARRAY *pa;
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int result;
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int is_circle = LW_FALSE;
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LWDEBUG(2, "lwcircle_calculate_gbox called.");
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radius = lwcircle_center(p1, p2, p3, ¢er);
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p2_side = signum(lw_segment_side((POINT2D*)p1, (POINT2D*)p3, (POINT2D*)p2));
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/* Matched start/end points imply circle */
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if ( p1->x == p3->x && p1->y == p3->y )
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is_circle = LW_TRUE;
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/* Negative radius signals straight line, p1/p2/p3 are colinear */
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if ( radius < 0.0 || p2_side == 0 )
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return NULL;
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/* The side of the p1/p3 line that p2 falls on dictates the sweep
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direction from p1 to p3. */
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if ( p2_side == -1 )
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clockwise = LW_TRUE;
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else
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clockwise = LW_FALSE;
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increment = fabs(M_PI_2 / perQuad);
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/* Angles of each point that defines the arc section */
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a1 = atan2(p1->y - center.y, p1->x - center.x);
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a2 = atan2(p2->y - center.y, p2->x - center.x);
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a3 = atan2(p3->y - center.y, p3->x - center.x);
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/* p2 on left side => clockwise sweep */
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if ( clockwise )
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{
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increment *= -1;
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/* Adjust a3 down so we can decrement from a1 to a3 cleanly */
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if ( a3 > a1 )
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a3 -= 2.0 * M_PI;
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if ( a2 > a1 )
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a2 -= 2.0 * M_PI;
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}
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/* p2 on right side => counter-clockwise sweep */
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else
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{
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/* Adjust a3 up so we can increment from a1 to a3 cleanly */
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if ( a3 < a1 )
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a3 += 2.0 * M_PI;
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if ( a2 < a1 )
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a2 += 2.0 * M_PI;
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}
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/* Override angles for circle case */
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if( is_circle )
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{
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a3 = a1 + 2.0 * M_PI;
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a2 = a1 + M_PI;
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increment = fabs(increment);
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clockwise = LW_FALSE;
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}
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/* Initialize point array */
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pa = ptarray_construct_empty(1, 1, 32);
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/* Sweep from a1 to a3 */
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for ( angle = a1; clockwise ? angle > a3 : angle < a3; angle += increment )
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{
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pt.x = center.x + radius * cos(angle);
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pt.y = center.y + radius * sin(angle);
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pt.z = interpolate_arc(angle, a1, a2, a3, p1->z, p2->z, p3->z);
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pt.m = interpolate_arc(angle, a1, a2, a3, p1->m, p2->m, p3->m);
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result = ptarray_append_point(pa, &pt, LW_FALSE);
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}
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return pa;
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}
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LWLINE *
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lwcircstring_segmentize(const LWCIRCSTRING *icurve, uint32 perQuad)
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{
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LWLINE *oline;
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POINTARRAY *ptarray;
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POINTARRAY *tmp;
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uint32 i, j;
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POINT4D p1, p2, p3, p4;
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LWDEBUGF(2, "lwcircstring_segmentize called., dim = %d", icurve->points->flags);
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ptarray = ptarray_construct_empty(FLAGS_GET_Z(icurve->points->flags), FLAGS_GET_M(icurve->points->flags), 64);
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for (i = 2; i < icurve->points->npoints; i+=2)
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{
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LWDEBUGF(3, "lwcircstring_segmentize: arc ending at point %d", i);
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getPoint4d_p(icurve->points, i - 2, &p1);
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getPoint4d_p(icurve->points, i - 1, &p2);
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getPoint4d_p(icurve->points, i, &p3);
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tmp = lwcircle_segmentize(&p1, &p2, &p3, perQuad);
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if (tmp)
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{
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LWDEBUGF(3, "lwcircstring_segmentize: generated %d points", tmp->npoints);
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for (j = 0; j < tmp->npoints; j++)
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{
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getPoint4d_p(tmp, j, &p4);
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ptarray_append_point(ptarray, &p4, REPEATED_POINTS_OK);
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}
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ptarray_free(tmp);
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}
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else
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{
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LWDEBUG(3, "lwcircstring_segmentize: points are colinear, returning curve points as line");
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for (j = i - 1 ; j <= i ; j++)
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{
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getPoint4d_p(icurve->points, j, &p4);
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ptarray_append_point(ptarray, &p4, REPEATED_POINTS_OK);
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}
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}
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}
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getPoint4d_p(icurve->points, icurve->points->npoints-1, &p1);
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ptarray_append_point(ptarray, &p1, REPEATED_POINTS_OK);
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oline = lwline_construct(icurve->srid, NULL, ptarray);
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return oline;
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}
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LWLINE *
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lwcompound_segmentize(const LWCOMPOUND *icompound, uint32 perQuad)
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{
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LWGEOM *geom;
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POINTARRAY *ptarray = NULL;
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LWLINE *tmp = NULL;
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uint32 i, j;
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POINT4D p;
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LWDEBUG(2, "lwcompound_segmentize called.");
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ptarray = ptarray_construct_empty(FLAGS_GET_Z(icompound->flags), FLAGS_GET_M(icompound->flags), 64);
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for (i = 0; i < icompound->ngeoms; i++)
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{
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geom = icompound->geoms[i];
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if (lwgeom_getType(geom->type) == CIRCSTRINGTYPE)
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{
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tmp = lwcircstring_segmentize((LWCIRCSTRING *)geom, perQuad);
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for (j = 0; j < tmp->points->npoints; j++)
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{
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getPoint4d_p(tmp->points, j, &p);
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ptarray_append_point(ptarray, &p, REPEATED_POINTS_OK);
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}
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lwfree(tmp);
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}
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else if (lwgeom_getType(geom->type) == LINETYPE)
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{
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tmp = (LWLINE *)geom;
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for (j = 0; j < tmp->points->npoints; j++)
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{
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getPoint4d_p(tmp->points, j, &p);
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ptarray_append_point(ptarray, &p, REPEATED_POINTS_OK);
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}
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}
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else
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{
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lwerror("Unsupported geometry type %d found.",
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lwgeom_getType(geom->type), lwtype_name(lwgeom_getType(geom->type)));
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return NULL;
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}
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}
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return lwline_construct(icompound->srid, NULL, ptarray);
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}
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LWPOLY *
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lwcurvepoly_segmentize(const LWCURVEPOLY *curvepoly, uint32 perQuad)
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{
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LWPOLY *ogeom;
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LWGEOM *tmp;
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LWLINE *line;
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POINTARRAY **ptarray;
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int i;
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LWDEBUG(2, "lwcurvepoly_segmentize called.");
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ptarray = lwalloc(sizeof(POINTARRAY *)*curvepoly->nrings);
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for (i = 0; i < curvepoly->nrings; i++)
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{
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tmp = curvepoly->rings[i];
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if (tmp->type == CIRCSTRINGTYPE)
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{
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line = lwcircstring_segmentize((LWCIRCSTRING *)tmp, perQuad);
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ptarray[i] = ptarray_clone(line->points);
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lwfree(line);
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}
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else if (tmp->type == LINETYPE)
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{
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line = (LWLINE *)tmp;
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ptarray[i] = ptarray_clone(line->points);
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}
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else if (tmp->type == COMPOUNDTYPE)
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{
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line = lwcompound_segmentize((LWCOMPOUND *)tmp, perQuad);
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ptarray[i] = ptarray_clone(line->points);
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lwfree(line);
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}
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else
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{
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lwerror("Invalid ring type found in CurvePoly.");
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return NULL;
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}
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}
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ogeom = lwpoly_construct(curvepoly->srid, NULL, curvepoly->nrings, ptarray);
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return ogeom;
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}
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LWMLINE *
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lwmcurve_segmentize(LWMCURVE *mcurve, uint32 perQuad)
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{
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LWMLINE *ogeom;
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LWGEOM *tmp;
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LWGEOM **lines;
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int i;
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LWDEBUGF(2, "lwmcurve_segmentize called, geoms=%d, dim=%d.", mcurve->ngeoms, TYPE_NDIMS(mcurve->type));
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lines = lwalloc(sizeof(LWGEOM *)*mcurve->ngeoms);
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for (i = 0; i < mcurve->ngeoms; i++)
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{
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tmp = mcurve->geoms[i];
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if (tmp->type == CIRCSTRINGTYPE)
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{
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lines[i] = (LWGEOM *)lwcircstring_segmentize((LWCIRCSTRING *)tmp, perQuad);
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}
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else if (tmp->type == LINETYPE)
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{
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lines[i] = (LWGEOM *)lwline_construct(mcurve->srid, NULL, ptarray_clone(((LWLINE *)tmp)->points));
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}
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else
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{
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lwerror("Unsupported geometry found in MultiCurve.");
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return NULL;
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}
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}
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ogeom = (LWMLINE *)lwcollection_construct(MULTILINETYPE, mcurve->srid, NULL, mcurve->ngeoms, lines);
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return ogeom;
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}
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LWMPOLY *
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lwmsurface_segmentize(LWMSURFACE *msurface, uint32 perQuad)
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{
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LWMPOLY *ogeom;
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LWGEOM *tmp;
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LWPOLY *poly;
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LWGEOM **polys;
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POINTARRAY **ptarray;
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int i, j;
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LWDEBUG(2, "lwmsurface_segmentize called.");
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polys = lwalloc(sizeof(LWGEOM *)*msurface->ngeoms);
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for (i = 0; i < msurface->ngeoms; i++)
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{
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tmp = msurface->geoms[i];
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if (tmp->type == CURVEPOLYTYPE)
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{
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polys[i] = (LWGEOM *)lwcurvepoly_segmentize((LWCURVEPOLY *)tmp, perQuad);
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}
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else if (lwgeom_getType(tmp->type) == POLYGONTYPE)
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{
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poly = (LWPOLY *)tmp;
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ptarray = lwalloc(sizeof(POINTARRAY *)*poly->nrings);
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for (j = 0; j < poly->nrings; j++)
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{
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ptarray[j] = ptarray_clone(poly->rings[j]);
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}
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polys[i] = (LWGEOM *)lwpoly_construct(msurface->srid, NULL, poly->nrings, ptarray);
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}
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}
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ogeom = (LWMPOLY *)lwcollection_construct(MULTIPOLYGONTYPE, msurface->srid, NULL, msurface->ngeoms, polys);
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return ogeom;
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}
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LWCOLLECTION *
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lwcollection_segmentize(LWCOLLECTION *collection, uint32 perQuad)
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{
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LWCOLLECTION *ocol;
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LWGEOM *tmp;
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LWGEOM **geoms;
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int i;
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LWDEBUG(2, "lwcollection_segmentize called.");
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geoms = lwalloc(sizeof(LWGEOM *)*collection->ngeoms);
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for (i=0; i<collection->ngeoms; i++)
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{
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tmp = collection->geoms[i];
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switch (tmp->type)
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{
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case CIRCSTRINGTYPE:
|
|
geoms[i] = (LWGEOM *)lwcircstring_segmentize((LWCIRCSTRING *)tmp, perQuad);
|
|
break;
|
|
case COMPOUNDTYPE:
|
|
geoms[i] = (LWGEOM *)lwcompound_segmentize((LWCOMPOUND *)tmp, perQuad);
|
|
break;
|
|
case CURVEPOLYTYPE:
|
|
geoms[i] = (LWGEOM *)lwcurvepoly_segmentize((LWCURVEPOLY *)tmp, perQuad);
|
|
break;
|
|
case COLLECTIONTYPE:
|
|
geoms[i] = (LWGEOM *)lwcollection_segmentize((LWCOLLECTION *)tmp, perQuad);
|
|
break;
|
|
default:
|
|
geoms[i] = lwgeom_clone(tmp);
|
|
break;
|
|
}
|
|
}
|
|
ocol = lwcollection_construct(COLLECTIONTYPE, collection->srid, NULL, collection->ngeoms, geoms);
|
|
return ocol;
|
|
}
|
|
|
|
LWGEOM *
|
|
lwgeom_segmentize(LWGEOM *geom, uint32 perQuad)
|
|
{
|
|
LWGEOM * ogeom = NULL;
|
|
switch (geom->type)
|
|
{
|
|
case CIRCSTRINGTYPE:
|
|
ogeom = (LWGEOM *)lwcircstring_segmentize((LWCIRCSTRING *)geom, perQuad);
|
|
break;
|
|
case COMPOUNDTYPE:
|
|
ogeom = (LWGEOM *)lwcompound_segmentize((LWCOMPOUND *)geom, perQuad);
|
|
break;
|
|
case CURVEPOLYTYPE:
|
|
ogeom = (LWGEOM *)lwcurvepoly_segmentize((LWCURVEPOLY *)geom, perQuad);
|
|
break;
|
|
case MULTICURVETYPE:
|
|
ogeom = (LWGEOM *)lwmcurve_segmentize((LWMCURVE *)geom, perQuad);
|
|
break;
|
|
case MULTISURFACETYPE:
|
|
ogeom = (LWGEOM *)lwmsurface_segmentize((LWMSURFACE *)geom, perQuad);
|
|
break;
|
|
case COLLECTIONTYPE:
|
|
ogeom = (LWGEOM *)lwcollection_segmentize((LWCOLLECTION *)geom, perQuad);
|
|
break;
|
|
default:
|
|
ogeom = lwgeom_clone(geom);
|
|
}
|
|
return ogeom;
|
|
}
|
|
|
|
/*******************************************************************************
|
|
* End curve segmentize functions
|
|
******************************************************************************/
|
|
LWGEOM *
|
|
append_segment(LWGEOM *geom, POINTARRAY *pts, int type, int srid)
|
|
{
|
|
LWGEOM *result;
|
|
int currentType, i;
|
|
|
|
LWDEBUGF(2, "append_segment called %p, %p, %d, %d", geom, pts, type, srid);
|
|
|
|
if (geom == NULL)
|
|
{
|
|
if (type == LINETYPE)
|
|
{
|
|
LWDEBUG(3, "append_segment: line to NULL");
|
|
|
|
return (LWGEOM *)lwline_construct(srid, NULL, pts);
|
|
}
|
|
else if (type == CIRCSTRINGTYPE)
|
|
{
|
|
#if POSTGIS_DEBUG_LEVEL >= 4
|
|
POINT4D tmp;
|
|
|
|
LWDEBUGF(4, "append_segment: curve to NULL %d", pts->npoints);
|
|
|
|
for (i=0; i<pts->npoints; i++)
|
|
{
|
|
getPoint4d_p(pts, i, &tmp);
|
|
LWDEBUGF(4, "new point: (%.16f,%.16f)",tmp.x,tmp.y);
|
|
}
|
|
#endif
|
|
return (LWGEOM *)lwcircstring_construct(srid, NULL, pts);
|
|
}
|
|
else
|
|
{
|
|
lwerror("Invalid segment type %d - %s.", type, lwtype_name(type));
|
|
}
|
|
}
|
|
|
|
currentType = geom->type;
|
|
if (currentType == LINETYPE && type == LINETYPE)
|
|
{
|
|
POINTARRAY *newPoints;
|
|
POINT4D pt;
|
|
LWLINE *line = (LWLINE *)geom;
|
|
|
|
LWDEBUG(3, "append_segment: line to line");
|
|
|
|
newPoints = ptarray_construct(FLAGS_GET_Z(pts->flags), FLAGS_GET_M(pts->flags), pts->npoints + line->points->npoints - 1);
|
|
for (i=0; i<line->points->npoints; i++)
|
|
{
|
|
getPoint4d_p(line->points, i, &pt);
|
|
LWDEBUGF(5, "copying to %p [%d]", newPoints, i);
|
|
ptarray_set_point4d(newPoints, i, &pt);
|
|
}
|
|
for (i=1; i<pts->npoints; i++)
|
|
{
|
|
getPoint4d_p(pts, i, &pt);
|
|
ptarray_set_point4d(newPoints, i + line->points->npoints - 1, &pt);
|
|
}
|
|
result = (LWGEOM *)lwline_construct(srid, NULL, newPoints);
|
|
lwgeom_release(geom);
|
|
return result;
|
|
}
|
|
else if (currentType == CIRCSTRINGTYPE && type == CIRCSTRINGTYPE)
|
|
{
|
|
POINTARRAY *newPoints;
|
|
POINT4D pt;
|
|
LWCIRCSTRING *curve = (LWCIRCSTRING *)geom;
|
|
|
|
LWDEBUG(3, "append_segment: circularstring to circularstring");
|
|
|
|
newPoints = ptarray_construct(FLAGS_GET_Z(pts->flags), FLAGS_GET_M(pts->flags), pts->npoints + curve->points->npoints - 1);
|
|
|
|
LWDEBUGF(3, "New array length: %d", pts->npoints + curve->points->npoints - 1);
|
|
|
|
for (i=0; i<curve->points->npoints; i++)
|
|
{
|
|
getPoint4d_p(curve->points, i, &pt);
|
|
|
|
LWDEBUGF(3, "orig point %d: (%.16f,%.16f)", i, pt.x, pt.y);
|
|
|
|
ptarray_set_point4d(newPoints, i, &pt);
|
|
}
|
|
for (i=1; i<pts->npoints; i++)
|
|
{
|
|
getPoint4d_p(pts, i, &pt);
|
|
|
|
LWDEBUGF(3, "new point %d: (%.16f,%.16f)", i + curve->points->npoints - 1, pt.x, pt.y);
|
|
|
|
ptarray_set_point4d(newPoints, i + curve->points->npoints - 1, &pt);
|
|
}
|
|
result = (LWGEOM *)lwcircstring_construct(srid, NULL, newPoints);
|
|
lwgeom_release(geom);
|
|
return result;
|
|
}
|
|
else if (currentType == CIRCSTRINGTYPE && type == LINETYPE)
|
|
{
|
|
LWLINE *line;
|
|
LWGEOM **geomArray;
|
|
|
|
LWDEBUG(3, "append_segment: line to curve");
|
|
|
|
geomArray = lwalloc(sizeof(LWGEOM *)*2);
|
|
geomArray[0] = lwgeom_clone(geom);
|
|
|
|
line = lwline_construct(srid, NULL, pts);
|
|
geomArray[1] = lwgeom_clone((LWGEOM *)line);
|
|
|
|
result = (LWGEOM *)lwcollection_construct(COMPOUNDTYPE, srid, NULL, 2, geomArray);
|
|
lwfree((LWGEOM *)line);
|
|
lwgeom_release(geom);
|
|
return result;
|
|
}
|
|
else if (currentType == LINETYPE && type == CIRCSTRINGTYPE)
|
|
{
|
|
LWCIRCSTRING *curve;
|
|
LWGEOM **geomArray;
|
|
|
|
LWDEBUG(3, "append_segment: circularstring to line");
|
|
|
|
geomArray = lwalloc(sizeof(LWGEOM *)*2);
|
|
geomArray[0] = lwgeom_clone(geom);
|
|
|
|
curve = lwcircstring_construct(srid, NULL, pts);
|
|
geomArray[1] = lwgeom_clone((LWGEOM *)curve);
|
|
|
|
result = (LWGEOM *)lwcollection_construct(COMPOUNDTYPE, srid, NULL, 2, geomArray);
|
|
lwfree((LWGEOM *)curve);
|
|
lwgeom_release(geom);
|
|
return result;
|
|
}
|
|
else if (currentType == COMPOUNDTYPE)
|
|
{
|
|
LWGEOM *newGeom;
|
|
LWCOMPOUND *compound;
|
|
int count;
|
|
LWGEOM **geomArray;
|
|
|
|
compound = (LWCOMPOUND *)geom;
|
|
count = compound->ngeoms + 1;
|
|
geomArray = lwalloc(sizeof(LWGEOM *)*count);
|
|
for (i=0; i<compound->ngeoms; i++)
|
|
{
|
|
geomArray[i] = lwgeom_clone(compound->geoms[i]);
|
|
}
|
|
if (type == LINETYPE)
|
|
{
|
|
LWDEBUG(3, "append_segment: line to compound");
|
|
|
|
newGeom = (LWGEOM *)lwline_construct(srid, NULL, pts);
|
|
}
|
|
else if (type == CIRCSTRINGTYPE)
|
|
{
|
|
LWDEBUG(3, "append_segment: circularstring to compound");
|
|
|
|
newGeom = (LWGEOM *)lwcircstring_construct(srid, NULL, pts);
|
|
}
|
|
else
|
|
{
|
|
lwerror("Invalid segment type %d - %s.", type, lwtype_name(type));
|
|
return NULL;
|
|
}
|
|
geomArray[compound->ngeoms] = lwgeom_clone(newGeom);
|
|
|
|
result = (LWGEOM *)lwcollection_construct(COMPOUNDTYPE, srid, NULL, count, geomArray);
|
|
lwfree(newGeom);
|
|
lwgeom_release(geom);
|
|
return result;
|
|
}
|
|
lwerror("Invalid state [%d] %s - [%d] %s",
|
|
currentType, lwtype_name(currentType), type, lwtype_name(type));
|
|
return NULL;
|
|
}
|
|
|
|
LWGEOM *
|
|
pta_desegmentize(POINTARRAY *points, int type, int srid)
|
|
{
|
|
int i, j, commit, isline, count;
|
|
double last_angle, last_length;
|
|
double dxab, dyab, dxbc, dybc, theta, length;
|
|
POINT4D a, b, c, tmp;
|
|
POINTARRAY *pts;
|
|
LWGEOM *geom = NULL;
|
|
|
|
LWDEBUG(2, "pta_desegmentize called.");
|
|
|
|
getPoint4d_p(points, 0, &a);
|
|
getPoint4d_p(points, 1, &b);
|
|
getPoint4d_p(points, 2, &c);
|
|
|
|
dxab = b.x - a.x;
|
|
dyab = b.y - a.y;
|
|
dxbc = c.x - b.x;
|
|
dybc = c.y - b.y;
|
|
|
|
theta = atan2(dyab, dxab);
|
|
last_angle = theta - atan2(dybc, dxbc);
|
|
last_length = sqrt(dxbc*dxbc+dybc*dybc);
|
|
length = sqrt(dxab*dxab+dyab*dyab);
|
|
if ((last_length - length) < EPSILON_SQLMM)
|
|
{
|
|
isline = -1;
|
|
LWDEBUG(3, "Starting as unknown.");
|
|
}
|
|
else
|
|
{
|
|
isline = 1;
|
|
LWDEBUG(3, "Starting as line.");
|
|
}
|
|
|
|
commit = 0;
|
|
for (i=3; i<points->npoints; i++)
|
|
{
|
|
getPoint4d_p(points, i-2, &a);
|
|
getPoint4d_p(points, i-1, &b);
|
|
getPoint4d_p(points, i, &c);
|
|
|
|
dxab = b.x - a.x;
|
|
dyab = b.y - a.y;
|
|
dxbc = c.x - b.x;
|
|
dybc = c.y - b.y;
|
|
|
|
LWDEBUGF(3, "(dxab, dyab, dxbc, dybc) (%.16f, %.16f, %.16f, %.16f)", dxab, dyab, dxbc, dybc);
|
|
|
|
theta = atan2(dyab, dxab);
|
|
theta = theta - atan2(dybc, dxbc);
|
|
length = sqrt(dxbc*dxbc+dybc*dybc);
|
|
|
|
LWDEBUGF(3, "Last/current length and angle %.16f/%.16f, %.16f/%.16f", last_angle, theta, last_length, length);
|
|
|
|
/* Found a line segment */
|
|
if (fabs(length - last_length) > EPSILON_SQLMM ||
|
|
fabs(theta - last_angle) > EPSILON_SQLMM)
|
|
{
|
|
last_length = length;
|
|
last_angle = theta;
|
|
/* We are tracking a line, keep going */
|
|
if (isline > 0)
|
|
{}
|
|
/* We were tracking a circularstring, commit it and start line*/
|
|
else if (isline == 0)
|
|
{
|
|
LWDEBUGF(3, "Building circularstring, %d - %d", commit, i);
|
|
|
|
count = i - commit;
|
|
pts = ptarray_construct(
|
|
FLAGS_GET_Z(points->flags),
|
|
FLAGS_GET_M(points->flags),
|
|
3);
|
|
getPoint4d_p(points, commit, &tmp);
|
|
ptarray_set_point4d(pts, 0, &tmp);
|
|
getPoint4d_p(points,
|
|
commit + count/2, &tmp);
|
|
ptarray_set_point4d(pts, 1, &tmp);
|
|
getPoint4d_p(points, i - 1, &tmp);
|
|
ptarray_set_point4d(pts, 2, &tmp);
|
|
|
|
commit = i-1;
|
|
geom = append_segment(geom, pts, CIRCSTRINGTYPE, srid);
|
|
isline = -1;
|
|
|
|
/*
|
|
* We now need to move ahead one point to
|
|
* determine if it's a potential new curve,
|
|
* since the last_angle value is corrupt.
|
|
*
|
|
* Note we can only look ahead one point if
|
|
* we are not already at the end of our
|
|
* set of points.
|
|
*/
|
|
if (i < points->npoints - 1)
|
|
{
|
|
i++;
|
|
|
|
getPoint4d_p(points, i-2, &a);
|
|
getPoint4d_p(points, i-1, &b);
|
|
getPoint4d_p(points, i, &c);
|
|
|
|
dxab = b.x - a.x;
|
|
dyab = b.y - a.y;
|
|
dxbc = c.x - b.x;
|
|
dybc = c.y - b.y;
|
|
|
|
theta = atan2(dyab, dxab);
|
|
last_angle = theta - atan2(dybc, dxbc);
|
|
last_length = sqrt(dxbc*dxbc+dybc*dybc);
|
|
length = sqrt(dxab*dxab+dyab*dyab);
|
|
if ((last_length - length) < EPSILON_SQLMM)
|
|
{
|
|
isline = -1;
|
|
LWDEBUG(3, "Restarting as unknown.");
|
|
}
|
|
else
|
|
{
|
|
isline = 1;
|
|
LWDEBUG(3, "Restarting as line.");
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Indicate that we have tracked a CIRCSTRING */
|
|
isline = 0;
|
|
}
|
|
}
|
|
/* We didn't know what we were tracking, now we do. */
|
|
else
|
|
{
|
|
LWDEBUG(3, "It's a line");
|
|
isline = 1;
|
|
}
|
|
}
|
|
/* Found a circularstring segment */
|
|
else
|
|
{
|
|
/* We were tracking a circularstring, commit it and start line */
|
|
if (isline > 0)
|
|
{
|
|
LWDEBUGF(3, "Building line, %d - %d", commit, i-2);
|
|
|
|
count = i - commit - 2;
|
|
|
|
pts = ptarray_construct(
|
|
FLAGS_GET_Z(points->flags),
|
|
FLAGS_GET_M(points->flags),
|
|
count);
|
|
for (j=commit; j<i-2; j++)
|
|
{
|
|
getPoint4d_p(points, j, &tmp);
|
|
ptarray_set_point4d(pts, j-commit, &tmp);
|
|
}
|
|
|
|
commit = i-3;
|
|
geom = append_segment(geom, pts, LINETYPE, srid);
|
|
isline = -1;
|
|
}
|
|
/* We are tracking a circularstring, keep going */
|
|
else if (isline == 0)
|
|
{
|
|
;
|
|
}
|
|
/* We didn't know what we were tracking, now we do */
|
|
else
|
|
{
|
|
LWDEBUG(3, "It's a circularstring");
|
|
isline = 0;
|
|
}
|
|
}
|
|
}
|
|
count = i - commit;
|
|
if (isline == 0 && count > 2)
|
|
{
|
|
LWDEBUGF(3, "Finishing circularstring %d,%d.", commit, i);
|
|
|
|
pts = ptarray_construct(
|
|
FLAGS_GET_Z(points->flags),
|
|
FLAGS_GET_M(points->flags),
|
|
3);
|
|
getPoint4d_p(points, commit, &tmp);
|
|
ptarray_set_point4d(pts, 0, &tmp);
|
|
getPoint4d_p(points, commit + count/2, &tmp);
|
|
ptarray_set_point4d(pts, 1, &tmp);
|
|
getPoint4d_p(points, i - 1, &tmp);
|
|
ptarray_set_point4d(pts, 2, &tmp);
|
|
|
|
geom = append_segment(geom, pts, CIRCSTRINGTYPE, srid);
|
|
}
|
|
else
|
|
{
|
|
LWDEBUGF(3, "Finishing line %d,%d.", commit, i);
|
|
|
|
pts = ptarray_construct(
|
|
FLAGS_GET_Z(points->flags),
|
|
FLAGS_GET_M(points->flags),
|
|
count);
|
|
for (j=commit; j<i; j++)
|
|
{
|
|
getPoint4d_p(points, j, &tmp);
|
|
ptarray_set_point4d(pts, j-commit, &tmp);
|
|
}
|
|
geom = append_segment(geom, pts, LINETYPE, srid);
|
|
}
|
|
return geom;
|
|
}
|
|
|
|
LWGEOM *
|
|
lwline_desegmentize(LWLINE *line)
|
|
{
|
|
LWDEBUG(2, "lwline_desegmentize called.");
|
|
|
|
return pta_desegmentize(line->points, line->flags, line->srid);
|
|
}
|
|
|
|
LWGEOM *
|
|
lwpolygon_desegmentize(LWPOLY *poly)
|
|
{
|
|
LWGEOM **geoms;
|
|
int i, hascurve = 0;
|
|
|
|
LWDEBUG(2, "lwpolygon_desegmentize called.");
|
|
|
|
geoms = lwalloc(sizeof(LWGEOM *)*poly->nrings);
|
|
for (i=0; i<poly->nrings; i++)
|
|
{
|
|
geoms[i] = pta_desegmentize(poly->rings[i], poly->flags, poly->srid);
|
|
if (geoms[i]->type == CIRCSTRINGTYPE || geoms[i]->type == COMPOUNDTYPE)
|
|
{
|
|
hascurve = 1;
|
|
}
|
|
}
|
|
if (hascurve == 0)
|
|
{
|
|
for (i=0; i<poly->nrings; i++)
|
|
{
|
|
lwfree(geoms[i]);
|
|
}
|
|
return lwgeom_clone((LWGEOM *)poly);
|
|
}
|
|
|
|
return (LWGEOM *)lwcollection_construct(CURVEPOLYTYPE, poly->srid, NULL, poly->nrings, geoms);
|
|
}
|
|
|
|
LWGEOM *
|
|
lwmline_desegmentize(LWMLINE *mline)
|
|
{
|
|
LWGEOM **geoms;
|
|
int i, hascurve = 0;
|
|
|
|
LWDEBUG(2, "lwmline_desegmentize called.");
|
|
|
|
geoms = lwalloc(sizeof(LWGEOM *)*mline->ngeoms);
|
|
for (i=0; i<mline->ngeoms; i++)
|
|
{
|
|
geoms[i] = lwline_desegmentize((LWLINE *)mline->geoms[i]);
|
|
if (geoms[i]->type == CIRCSTRINGTYPE || geoms[i]->type == COMPOUNDTYPE)
|
|
{
|
|
hascurve = 1;
|
|
}
|
|
}
|
|
if (hascurve == 0)
|
|
{
|
|
for (i=0; i<mline->ngeoms; i++)
|
|
{
|
|
lwfree(geoms[i]);
|
|
}
|
|
return lwgeom_clone((LWGEOM *)mline);
|
|
}
|
|
return (LWGEOM *)lwcollection_construct(MULTICURVETYPE, mline->srid, NULL, mline->ngeoms, geoms);
|
|
}
|
|
|
|
LWGEOM *
|
|
lwmpolygon_desegmentize(LWMPOLY *mpoly)
|
|
{
|
|
LWGEOM **geoms;
|
|
int i, hascurve = 0;
|
|
|
|
LWDEBUG(2, "lwmpoly_desegmentize called.");
|
|
|
|
geoms = lwalloc(sizeof(LWGEOM *)*mpoly->ngeoms);
|
|
for (i=0; i<mpoly->ngeoms; i++)
|
|
{
|
|
geoms[i] = lwpolygon_desegmentize((LWPOLY *)mpoly->geoms[i]);
|
|
if (geoms[i]->type == CURVEPOLYTYPE)
|
|
{
|
|
hascurve = 1;
|
|
}
|
|
}
|
|
if (hascurve == 0)
|
|
{
|
|
for (i=0; i<mpoly->ngeoms; i++)
|
|
{
|
|
lwfree(geoms[i]);
|
|
}
|
|
return lwgeom_clone((LWGEOM *)mpoly);
|
|
}
|
|
return (LWGEOM *)lwcollection_construct(MULTISURFACETYPE, mpoly->srid, NULL, mpoly->ngeoms, geoms);
|
|
}
|
|
|
|
LWGEOM *
|
|
lwgeom_desegmentize(LWGEOM *geom)
|
|
{
|
|
LWDEBUG(2, "lwgeom_desegmentize called.");
|
|
|
|
switch (geom->type)
|
|
{
|
|
case LINETYPE:
|
|
return lwline_desegmentize((LWLINE *)geom);
|
|
case POLYGONTYPE:
|
|
return lwpolygon_desegmentize((LWPOLY *)geom);
|
|
case MULTILINETYPE:
|
|
return lwmline_desegmentize((LWMLINE *)geom);
|
|
case MULTIPOLYGONTYPE:
|
|
return lwmpolygon_desegmentize((LWMPOLY *)geom);
|
|
default:
|
|
return lwgeom_clone(geom);
|
|
}
|
|
}
|
|
|