/*
** Is shape1 within shape2, returns MS_TRUE/MS_FALSE or -1 for an error.
*/
int msGEOSWithin(shapeObj *shape1, shapeObj *shape2)
{
#ifdef USE_GEOS
GEOSGeom g1, g2;
int result;
if(!shape1 || !shape2)
return -1;
if(!shape1->geometry) /* if no geometry for shape1 then build one */
shape1->geometry = (GEOSGeom) msGEOSShape2Geometry(shape1);
g1 = shape1->geometry;
if(!g1) return -1;
if(!shape2->geometry) /* if no geometry for shape2 then build one */
shape2->geometry = (GEOSGeom) msGEOSShape2Geometry(shape2);
g2 = shape2->geometry;
if(!g2) return -1;
result = GEOSWithin(g1, g2);
return ((result==2) ? -1 : result);
#else
msSetError(MS_GEOSERR, "GEOS support is not available.", "msGEOSWithin()");
return -1;
#endif
}
double msGEOSDistance(shapeObj *shape1, shapeObj *shape2)
{
#ifdef USE_GEOS
GEOSGeom g1, g2;
double distance;
int result;
if(!shape1 || !shape2)
return -1;
if(!shape1->geometry) /* if no geometry for shape1 then build one */
shape1->geometry = (GEOSGeom) msGEOSShape2Geometry(shape1);
g1 = (GEOSGeom) shape1->geometry;
if(!g1) return -1;
if(!shape2->geometry) /* if no geometry for shape2 then build one */
shape2->geometry = (GEOSGeom) msGEOSShape2Geometry(shape2);
g2 = (GEOSGeom) shape2->geometry;
if(!g2) return -1;
result = GEOSDistance(g1, g2, &distance);
return ((result==0) ? -1 : distance);
#else
return msDistanceShapeToShape(shape1, shape2); /* fall back on brute force method (for MapScript) */
#endif
}
shapeObj *msGEOSSymDifference(shapeObj *shape1, shapeObj *shape2)
{
#ifdef USE_GEOS
GEOSGeom g1, g2, g3;
if(!shape1 || !shape2)
return NULL;
if(!shape1->geometry) /* if no geometry for the shape then build one */
shape1->geometry = (GEOSGeom) msGEOSShape2Geometry(shape1);
g1 = (GEOSGeom) shape1->geometry;
if(!g1) return NULL;
if(!shape2->geometry) /* if no geometry for the shape then build one */
shape2->geometry = (GEOSGeom) msGEOSShape2Geometry(shape2);
g2 = (GEOSGeom) shape2->geometry;
if(!g2) return NULL;
g3 = GEOSSymDifference(g1, g2);
return msGEOSGeometry2Shape(g3);
#else
msSetError(MS_GEOSERR, "GEOS support is not available.", "msGEOSSymDifference()");
return NULL;
#endif
}
pointObj *msGEOSGetCentroid(shapeObj *shape)
{
#ifdef USE_GEOS
GEOSGeom g1, g2;
GEOSCoordSeq coords;
pointObj *point;
if(!shape) return NULL;
if(!shape->geometry) /* if no geometry for the shape then build one */
shape->geometry = (GEOSGeom) msGEOSShape2Geometry(shape);
g1 = (GEOSGeom) shape->geometry;
if(!g1) return NULL;
g2 = GEOSGetCentroid(g1);
point = (pointObj *) malloc(sizeof(pointObj));
coords = (GEOSCoordSeq) GEOSGeom_getCoordSeq(g2);
GEOSCoordSeq_getX(coords, 0, &(point->x));
GEOSCoordSeq_getY(coords, 0, &(point->y));
/* GEOSCoordSeq_getZ(coords, 0, &(point->z)); */
GEOSCoordSeq_destroy(coords);
return point;
#else
msSetError(MS_GEOSERR, "GEOS support is not available.", "msGEOSGetCentroid()");
return NULL;
#endif
}
double msGEOSLength(shapeObj *shape)
{
#if defined(USE_GEOS) && defined(GEOS_CAPI_VERSION_MAJOR) && defined(GEOS_CAPI_VERSION_MINOR) && (GEOS_CAPI_VERSION_MAJOR > 1 || GEOS_CAPI_VERSION_MINOR >= 1)
GEOSGeom g;
double length;
int result;
if(!shape) return -1;
if(!shape->geometry) /* if no geometry for the shape then build one */
shape->geometry = (GEOSGeom) msGEOSShape2Geometry(shape);
g = (GEOSGeom) shape->geometry;
if(!g) return -1;
result = GEOSLength(g, &length);
return ((result==0) ? -1 : length);
#elif defined(USE_GEOS)
msSetError(MS_GEOSERR, "GEOS support enabled, but old version lacks GEOSLength().", "msGEOSLength()");
return -1;
#else
msSetError(MS_GEOSERR, "GEOS support is not available.", "msGEOSLength()");
return -1;
#endif
}
/*
** Does shape1 intersect shape2, returns MS_TRUE/MS_FALSE or -1 for an error.
*/
int msGEOSIntersects(shapeObj *shape1, shapeObj *shape2)
{
#ifdef USE_GEOS
GEOSGeom g1, g2;
int result;
if(!shape1 || !shape2)
return -1;
if(!shape1->geometry) /* if no geometry for shape1 then build one */
shape1->geometry = (GEOSGeom) msGEOSShape2Geometry(shape1);
g1 = (GEOSGeom) shape1->geometry;
if(!g1) return -1;
if(!shape2->geometry) /* if no geometry for shape2 then build one */
shape2->geometry = (GEOSGeom) msGEOSShape2Geometry(shape2);
g2 = (GEOSGeom) shape2->geometry;
if(!g2) return -1;
result = GEOSIntersects(g1, g2);
return ((result==2) ? -1 : result);
#else
if(!shape1 || !shape2)
return -1;
switch(shape1->type) { /* todo: deal with point shapes */
case(MS_SHAPE_LINE):
switch(shape2->type) {
case(MS_SHAPE_LINE):
return msIntersectPolylines(shape1, shape2);
case(MS_SHAPE_POLYGON):
return msIntersectPolylinePolygon(shape1, shape2);
}
break;
case(MS_SHAPE_POLYGON):
switch(shape2->type) {
case(MS_SHAPE_LINE):
return msIntersectPolylinePolygon(shape2, shape1);
case(MS_SHAPE_POLYGON):
return msIntersectPolygons(shape1, shape2);
}
break;
}
return -1;
#endif
}
shapeObj *msGEOSBoundary(shapeObj *shape)
{
#ifdef USE_GEOS
GEOSGeom g1, g2;
if(!shape) return NULL;
if(!shape->geometry) /* if no geometry for the shape then build one */
shape->geometry = (GEOSGeom) msGEOSShape2Geometry(shape);
g1 = (GEOSGeom) shape->geometry;
if(!g1) return NULL;
g2 = GEOSBoundary(g1);
return msGEOSGeometry2Shape(g2);
#else
msSetError(MS_GEOSERR, "GEOS support is not available.", "msGEOSBoundary()");
return NULL;
#endif
}
shapeObj *msGEOSOffsetCurve(shapeObj *p, double offset) {
#if defined USE_GEOS && defined HAVE_GEOS_OFFSET_CURVE
GEOSGeom g1, g2;
if(!p)
return NULL;
if(!p->geometry) /* if no geometry for the shape then build one */
p->geometry = (GEOSGeom) msGEOSShape2Geometry(p);
g1 = (GEOSGeom) p->geometry;
if(!g1) return NULL;
g2 = GEOSOffsetCurve(g1, offset, 4, GEOSBUF_JOIN_MITRE, fabs(offset*1.5));
return msGEOSGeometry2Shape(g2);
#else
msSetError(MS_GEOSERR, "GEOS support is not available.", "msGEOSingleSidedBuffer()");
return NULL;
#endif
}
shapeObj *msGEOSTopologyPreservingSimplify(shapeObj *shape, double tolerance)
{
#ifdef USE_GEOS
GEOSGeom g1, g2;
if(!shape)
return NULL;
if(!shape->geometry) /* if no geometry for the shape then build one */
shape->geometry = (GEOSGeom) msGEOSShape2Geometry(shape);
g1 = (GEOSGeom) shape->geometry;
if(!g1) return NULL;
g2 = GEOSTopologyPreserveSimplify(g1, tolerance);
return msGEOSGeometry2Shape(g2);
#else
msSetError(MS_GEOSERR, "GEOS Simplify support is not available.", "msGEOSTopologyPreservingSimplify()");
return NULL;
#endif
}
/* Return should be freed with msGEOSFreeWKT */
char *msGEOSShapeToWKT(shapeObj *shape)
{
#ifdef USE_GEOS
GEOSGeom g;
if(!shape)
return NULL;
/* if we have a geometry, we should update it*/
msGEOSFreeGeometry(shape);
shape->geometry = (GEOSGeom) msGEOSShape2Geometry(shape);
g = (GEOSGeom) shape->geometry;
if(!g) return NULL;
return GEOSGeomToWKT(g);
#else
msSetError(MS_GEOSERR, "GEOS support is not available.", "msGEOSShapeToWKT()");
return NULL;
#endif
}