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https://git.osgeo.org/gitea/postgis/postgis
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649 lines
14 KiB
C
649 lines
14 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 2001-2003 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 hte GNU General Public Licence. See the COPYING file.
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*
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**********************************************************************/
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/** @file
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*
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* SVG output routines.
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* Originally written by: Klaus Förster <klaus@svg.cc>
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* Refactored by: Olivier Courtin (Camptocamp)
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*
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* BNF SVG Path: <http://www.w3.org/TR/SVG/paths.html#PathDataBNF>
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**********************************************************************/
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#include "liblwgeom_internal.h"
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static char * assvg_point(const LWPOINT *point, int relative, int precision);
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static char * assvg_line(const LWLINE *line, int relative, int precision);
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static char * assvg_polygon(const LWPOLY *poly, int relative, int precision);
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static char * assvg_multipoint(const LWMPOINT *mpoint, int relative, int precision);
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static char * assvg_multiline(const LWMLINE *mline, int relative, int precision);
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static char * assvg_multipolygon(const LWMPOLY *mpoly, int relative, int precision);
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static char * assvg_collection(const LWCOLLECTION *col, int relative, int precision);
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static size_t assvg_geom_size(const LWGEOM *geom, int relative, int precision);
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static size_t assvg_geom_buf(const LWGEOM *geom, char *output, int relative, int precision);
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static size_t pointArray_svg_size(POINTARRAY *pa, int precision);
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static size_t pointArray_svg_rel(POINTARRAY *pa, char * output, int close_ring, int precision);
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static size_t pointArray_svg_abs(POINTARRAY *pa, char * output, int close_ring, int precision);
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/**
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* Takes a GEOMETRY and returns a SVG representation
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*/
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char *
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lwgeom_to_svg(const LWGEOM *geom, int precision, int relative)
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{
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char *ret = NULL;
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int type = geom->type;
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switch (type)
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{
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case POINTTYPE:
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ret = assvg_point((LWPOINT*)geom, relative, precision);
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break;
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case LINETYPE:
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ret = assvg_line((LWLINE*)geom, relative, precision);
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break;
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case POLYGONTYPE:
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ret = assvg_polygon((LWPOLY*)geom, relative, precision);
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break;
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case MULTIPOINTTYPE:
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ret = assvg_multipoint((LWMPOINT*)geom, relative, precision);
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break;
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case MULTILINETYPE:
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ret = assvg_multiline((LWMLINE*)geom, relative, precision);
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break;
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case MULTIPOLYGONTYPE:
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ret = assvg_multipolygon((LWMPOLY*)geom, relative, precision);
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break;
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case COLLECTIONTYPE:
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ret = assvg_collection((LWCOLLECTION*)geom, relative, precision);
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break;
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default:
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lwerror("lwgeom_to_svg: '%s' geometry type not supported",
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lwtype_name(type));
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}
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return ret;
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}
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/**
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* Point Geometry
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*/
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static size_t
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assvg_point_size(const LWPOINT *point, int circle, int precision)
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{
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size_t size;
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size = (OUT_MAX_DIGS_DOUBLE + precision) * 2;
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if (circle) size += sizeof("cx='' cy=''");
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else size += sizeof("x='' y=''");
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return size;
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}
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static size_t
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assvg_point_buf(const LWPOINT *point, char * output, int circle, int precision)
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{
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char *ptr=output;
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char x[OUT_MAX_DIGS_DOUBLE+OUT_MAX_DOUBLE_PRECISION+1];
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char y[OUT_MAX_DIGS_DOUBLE+OUT_MAX_DOUBLE_PRECISION+1];
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POINT2D pt;
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getPoint2d_p(point->point, 0, &pt);
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if (fabs(pt.x) < OUT_MAX_DOUBLE)
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sprintf(x, "%.*f", precision, pt.x);
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else
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sprintf(x, "%g", pt.x);
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trim_trailing_zeros(x);
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/* SVG Y axis is reversed, an no need to transform 0 into -0 */
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if (fabs(pt.y) < OUT_MAX_DOUBLE)
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sprintf(y, "%.*f", precision, fabs(pt.y) ? pt.y * -1 : pt.y);
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else
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sprintf(y, "%g", fabs(pt.y) ? pt.y * -1 : pt.y);
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trim_trailing_zeros(y);
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if (circle) ptr += sprintf(ptr, "x=\"%s\" y=\"%s\"", x, y);
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else ptr += sprintf(ptr, "cx=\"%s\" cy=\"%s\"", x, y);
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return (ptr-output);
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}
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static char *
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assvg_point(const LWPOINT *point, int circle, int precision)
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{
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char *output;
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int size;
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size = assvg_point_size(point, circle, precision);
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output = lwalloc(size);
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assvg_point_buf(point, output, circle, precision);
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return output;
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}
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/**
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* Line Geometry
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*/
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static size_t
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assvg_line_size(const LWLINE *line, int relative, int precision)
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{
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size_t size;
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size = sizeof("M ");
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size += pointArray_svg_size(line->points, precision);
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return size;
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}
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static size_t
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assvg_line_buf(const LWLINE *line, char * output, int relative, int precision)
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{
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char *ptr=output;
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/* Start path with SVG MoveTo */
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ptr += sprintf(ptr, "M ");
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if (relative)
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ptr += pointArray_svg_rel(line->points, ptr, 1, precision);
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else
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ptr += pointArray_svg_abs(line->points, ptr, 1, precision);
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return (ptr-output);
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}
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static char *
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assvg_line(const LWLINE *line, int relative, int precision)
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{
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char *output;
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int size;
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size = assvg_line_size(line, relative, precision);
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output = lwalloc(size);
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assvg_line_buf(line, output, relative, precision);
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return output;
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}
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/**
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* Polygon Geometry
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*/
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static size_t
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assvg_polygon_size(const LWPOLY *poly, int relative, int precision)
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{
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int i;
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size_t size=0;
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for (i=0; i<poly->nrings; i++)
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size += pointArray_svg_size(poly->rings[i], precision) + sizeof(" ");
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size += sizeof("M Z") * poly->nrings;
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return size;
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}
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static size_t
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assvg_polygon_buf(const LWPOLY *poly, char * output, int relative, int precision)
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{
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int i;
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char *ptr=output;
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for (i=0; i<poly->nrings; i++)
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{
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if (i) ptr += sprintf(ptr, " "); /* Space beetween each ring */
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ptr += sprintf(ptr, "M "); /* Start path with SVG MoveTo */
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if (relative)
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{
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ptr += pointArray_svg_rel(poly->rings[i], ptr, 0, precision);
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ptr += sprintf(ptr, " z"); /* SVG closepath */
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}
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else
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{
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ptr += pointArray_svg_abs(poly->rings[i], ptr, 0, precision);
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ptr += sprintf(ptr, " Z"); /* SVG closepath */
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}
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}
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return (ptr-output);
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}
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static char *
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assvg_polygon(const LWPOLY *poly, int relative, int precision)
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{
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char *output;
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int size;
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size = assvg_polygon_size(poly, relative, precision);
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output = lwalloc(size);
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assvg_polygon_buf(poly, output, relative, precision);
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return output;
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}
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/**
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* Multipoint Geometry
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*/
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static size_t
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assvg_multipoint_size(const LWMPOINT *mpoint, int relative, int precision)
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{
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const LWPOINT *point;
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size_t size=0;
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int i;
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for (i=0 ; i<mpoint->ngeoms ; i++)
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{
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point = mpoint->geoms[i];
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size += assvg_point_size(point, relative, precision);
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}
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size += sizeof(",") * --i; /* Arbitrary comma separator */
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return size;
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}
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static size_t
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assvg_multipoint_buf(const LWMPOINT *mpoint, char *output, int relative, int precision)
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{
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const LWPOINT *point;
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int i;
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char *ptr=output;
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for (i=0 ; i<mpoint->ngeoms ; i++)
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{
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if (i) ptr += sprintf(ptr, ","); /* Arbitrary comma separator */
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point = mpoint->geoms[i];
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ptr += assvg_point_buf(point, ptr, relative, precision);
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}
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return (ptr-output);
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}
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static char *
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assvg_multipoint(const LWMPOINT *mpoint, int relative, int precision)
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{
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char *output;
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int size;
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size = assvg_multipoint_size(mpoint, relative, precision);
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output = lwalloc(size);
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assvg_multipoint_buf(mpoint, output, relative, precision);
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return output;
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}
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/**
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* Multiline Geometry
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*/
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static size_t
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assvg_multiline_size(const LWMLINE *mline, int relative, int precision)
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{
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const LWLINE *line;
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size_t size=0;
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int i;
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for (i=0 ; i<mline->ngeoms ; i++)
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{
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line = mline->geoms[i];
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size += assvg_line_size(line, relative, precision);
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}
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size += sizeof(" ") * --i; /* SVG whitespace Separator */
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return size;
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}
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static size_t
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assvg_multiline_buf(const LWMLINE *mline, char *output, int relative, int precision)
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{
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const LWLINE *line;
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int i;
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char *ptr=output;
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for (i=0 ; i<mline->ngeoms ; i++)
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{
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if (i) ptr += sprintf(ptr, " "); /* SVG whitespace Separator */
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line = mline->geoms[i];
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ptr += assvg_line_buf(line, ptr, relative, precision);
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}
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return (ptr-output);
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}
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static char *
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assvg_multiline(const LWMLINE *mline, int relative, int precision)
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{
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char *output;
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int size;
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size = assvg_multiline_size(mline, relative, precision);
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output = lwalloc(size);
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assvg_multiline_buf(mline, output, relative, precision);
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return output;
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}
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/*
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* Multipolygon Geometry
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*/
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static size_t
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assvg_multipolygon_size(const LWMPOLY *mpoly, int relative, int precision)
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{
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const LWPOLY *poly;
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size_t size=0;
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int i;
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for (i=0 ; i<mpoly->ngeoms ; i++)
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{
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poly = mpoly->geoms[i];
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size += assvg_polygon_size(poly, relative, precision);
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}
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size += sizeof(" ") * --i; /* SVG whitespace Separator */
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return size;
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}
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static size_t
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assvg_multipolygon_buf(const LWMPOLY *mpoly, char *output, int relative, int precision)
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{
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const LWPOLY *poly;
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int i;
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char *ptr=output;
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for (i=0 ; i<mpoly->ngeoms ; i++)
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{
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if (i) ptr += sprintf(ptr, " "); /* SVG whitespace Separator */
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poly = mpoly->geoms[i];
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ptr += assvg_polygon_buf(poly, ptr, relative, precision);
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}
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return (ptr-output);
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}
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static char *
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assvg_multipolygon(const LWMPOLY *mpoly, int relative, int precision)
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{
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char *output;
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int size;
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size = assvg_multipolygon_size(mpoly, relative, precision);
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output = lwalloc(size);
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assvg_multipolygon_buf(mpoly, output, relative, precision);
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return output;
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}
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/**
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* Collection Geometry
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*/
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static size_t
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assvg_collection_size(const LWCOLLECTION *col, int relative, int precision)
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{
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int i = 0;
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size_t size=0;
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const LWGEOM *subgeom;
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for (i=0; i<col->ngeoms; i++)
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{
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subgeom = col->geoms[i];
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size += assvg_geom_size(subgeom, relative, precision);
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}
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if ( i ) /* We have some geometries, so add space for delimiters. */
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size += sizeof(";") * --i;
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if (size == 0) size++; /* GEOMETRYCOLLECTION EMPTY, space for null terminator */
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return size;
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}
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static size_t
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assvg_collection_buf(const LWCOLLECTION *col, char *output, int relative, int precision)
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{
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int i;
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char *ptr=output;
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const LWGEOM *subgeom;
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/* EMPTY GEOMETRYCOLLECTION */
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if (col->ngeoms == 0) *ptr = '\0';
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for (i=0; i<col->ngeoms; i++)
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{
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if (i) ptr += sprintf(ptr, ";");
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subgeom = col->geoms[i];
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ptr += assvg_geom_buf(subgeom, ptr, relative, precision);
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}
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return (ptr - output);
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}
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static char *
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assvg_collection(const LWCOLLECTION *col, int relative, int precision)
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{
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char *output;
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int size;
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size = assvg_collection_size(col, relative, precision);
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output = lwalloc(size);
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assvg_collection_buf(col, output, relative, precision);
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return output;
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}
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static size_t
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assvg_geom_buf(const LWGEOM *geom, char *output, int relative, int precision)
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{
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int type = geom->type;
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char *ptr=output;
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switch (type)
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{
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case POINTTYPE:
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ptr += assvg_point_buf((LWPOINT*)geom, ptr, relative, precision);
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break;
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case LINETYPE:
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ptr += assvg_line_buf((LWLINE*)geom, ptr, relative, precision);
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break;
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case POLYGONTYPE:
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ptr += assvg_polygon_buf((LWPOLY*)geom, ptr, relative, precision);
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break;
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case MULTIPOINTTYPE:
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ptr += assvg_multipoint_buf((LWMPOINT*)geom, ptr, relative, precision);
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break;
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case MULTILINETYPE:
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ptr += assvg_multiline_buf((LWMLINE*)geom, ptr, relative, precision);
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break;
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case MULTIPOLYGONTYPE:
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ptr += assvg_multipolygon_buf((LWMPOLY*)geom, ptr, relative, precision);
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break;
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default:
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lwerror("assvg_geom_buf: '%s' geometry type not supported.",
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lwtype_name(type));
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}
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return (ptr-output);
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}
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static size_t
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assvg_geom_size(const LWGEOM *geom, int relative, int precision)
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{
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int type = geom->type;
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size_t size = 0;
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switch (type)
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{
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case POINTTYPE:
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size = assvg_point_size((LWPOINT*)geom, relative, precision);
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break;
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case LINETYPE:
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size = assvg_line_size((LWLINE*)geom, relative, precision);
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break;
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case POLYGONTYPE:
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size = assvg_polygon_size((LWPOLY*)geom, relative, precision);
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break;
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case MULTIPOINTTYPE:
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size = assvg_multipoint_size((LWMPOINT*)geom, relative, precision);
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break;
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case MULTILINETYPE:
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size = assvg_multiline_size((LWMLINE*)geom, relative, precision);
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break;
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case MULTIPOLYGONTYPE:
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size = assvg_multipolygon_size((LWMPOLY*)geom, relative, precision);
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break;
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default:
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lwerror("assvg_geom_size: '%s' geometry type not supported.",
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lwtype_name(type));
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}
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return size;
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}
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static size_t
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pointArray_svg_rel(POINTARRAY *pa, char *output, int close_ring, int precision)
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{
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int i, end;
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char *ptr;
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char x[OUT_MAX_DIGS_DOUBLE+OUT_MAX_DOUBLE_PRECISION+1];
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char y[OUT_MAX_DIGS_DOUBLE+OUT_MAX_DOUBLE_PRECISION+1];
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POINT2D pt, lpt;
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ptr = output;
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if (close_ring) end = pa->npoints;
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else end = pa->npoints - 1;
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/* Starting point */
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getPoint2d_p(pa, 0, &pt);
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if (fabs(pt.x) < OUT_MAX_DOUBLE)
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sprintf(x, "%.*f", precision, pt.x);
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else
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sprintf(x, "%g", pt.x);
|
|
trim_trailing_zeros(x);
|
|
|
|
if (fabs(pt.y) < OUT_MAX_DOUBLE)
|
|
sprintf(y, "%.*f", precision, fabs(pt.y) ? pt.y * -1 : pt.y);
|
|
else
|
|
sprintf(y, "%g", fabs(pt.y) ? pt.y * -1 : pt.y);
|
|
trim_trailing_zeros(y);
|
|
|
|
ptr += sprintf(ptr,"%s %s l", x, y);
|
|
|
|
/* All the following ones */
|
|
for (i=1 ; i < end ; i++)
|
|
{
|
|
lpt = pt;
|
|
|
|
getPoint2d_p(pa, i, &pt);
|
|
if (fabs(pt.x -lpt.x) < OUT_MAX_DOUBLE)
|
|
sprintf(x, "%.*f", precision, pt.x -lpt.x);
|
|
else
|
|
sprintf(x, "%g", pt.x -lpt.x);
|
|
trim_trailing_zeros(x);
|
|
|
|
/* SVG Y axis is reversed, an no need to transform 0 into -0 */
|
|
if (fabs(pt.y -lpt.y) < OUT_MAX_DOUBLE)
|
|
sprintf(y, "%.*f", precision,
|
|
fabs(pt.y -lpt.y) ? (pt.y - lpt.y) * -1: (pt.y - lpt.y));
|
|
else
|
|
sprintf(y, "%g",
|
|
fabs(pt.y -lpt.y) ? (pt.y - lpt.y) * -1: (pt.y - lpt.y));
|
|
trim_trailing_zeros(y);
|
|
|
|
ptr += sprintf(ptr," %s %s", x, y);
|
|
}
|
|
|
|
return (ptr-output);
|
|
}
|
|
|
|
|
|
/**
|
|
* Returns maximum size of rendered pointarray in bytes.
|
|
*/
|
|
static size_t
|
|
pointArray_svg_abs(POINTARRAY *pa, char *output, int close_ring, int precision)
|
|
{
|
|
int i, end;
|
|
char *ptr;
|
|
char x[OUT_MAX_DIGS_DOUBLE+OUT_MAX_DOUBLE_PRECISION+1];
|
|
char y[OUT_MAX_DIGS_DOUBLE+OUT_MAX_DOUBLE_PRECISION+1];
|
|
POINT2D pt;
|
|
|
|
ptr = output;
|
|
|
|
if (close_ring) end = pa->npoints;
|
|
else end = pa->npoints - 1;
|
|
|
|
for (i=0 ; i < end ; i++)
|
|
{
|
|
getPoint2d_p(pa, i, &pt);
|
|
|
|
if (fabs(pt.x) < OUT_MAX_DOUBLE)
|
|
sprintf(x, "%.*f", precision, pt.x);
|
|
else
|
|
sprintf(x, "%g", pt.x);
|
|
trim_trailing_zeros(x);
|
|
|
|
/* SVG Y axis is reversed, an no need to transform 0 into -0 */
|
|
if (fabs(pt.y) < OUT_MAX_DOUBLE)
|
|
sprintf(y, "%.*f", precision, fabs(pt.y) ? pt.y * -1:pt.y);
|
|
else
|
|
sprintf(y, "%g", fabs(pt.y) ? pt.y * -1:pt.y);
|
|
trim_trailing_zeros(y);
|
|
|
|
if (i == 1) ptr += sprintf(ptr, " L ");
|
|
else if (i) ptr += sprintf(ptr, " ");
|
|
ptr += sprintf(ptr,"%s %s", x, y);
|
|
}
|
|
|
|
return (ptr-output);
|
|
}
|
|
|
|
|
|
/**
|
|
* Returns maximum size of rendered pointarray in bytes.
|
|
*/
|
|
static size_t
|
|
pointArray_svg_size(POINTARRAY *pa, int precision)
|
|
{
|
|
return (OUT_MAX_DIGS_DOUBLE + precision + sizeof(" "))
|
|
* 2 * pa->npoints + sizeof(" L ");
|
|
}
|