gvsig-geoprocess / org.gvsig.geoprocess / trunk / org.gvsig.geoprocess / org.gvsig.geoprocess.algorithm / org.gvsig.geoprocess.algorithm.difference / src / main / java / org / gvsig / geoprocess / algorithm / difference / DifferenceOperation.java @ 237
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/**
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* gvSIG. Desktop Geographic Information System.
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*
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* Copyright (C) 2007,2012 gvSIG Association.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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/*
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* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
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*
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* Copyright (C) 2010 Generalitat Valenciana.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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*/
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package org.gvsig.geoprocess.algorithm.difference; |
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import com.vividsolutions.jts.geom.Geometry; |
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import com.vividsolutions.jts.precision.EnhancedPrecisionOp; |
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import es.unex.sextante.core.Sextante; |
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import org.gvsig.fmap.dal.exception.DataException; |
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import org.gvsig.fmap.dal.feature.EditableFeature; |
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import org.gvsig.fmap.dal.feature.Feature; |
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import org.gvsig.fmap.geom.exception.CreateGeometryException; |
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import org.gvsig.geoprocess.algorithm.base.core.GeometryOperation; |
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import org.gvsig.geoprocess.algorithm.base.util.GeometryUtil; |
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/**
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* Difference between two geometries
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* @author Nacho Brodin (nachobrodin@gmail.com)
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*/
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public class DifferenceOperation extends GeometryOperation { |
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/**
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* Clipping geometry: the convex hull of the
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* clipping layer
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*/
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private Geometry overlaysGeom = null; |
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public DifferenceOperation(org.gvsig.fmap.geom.Geometry overlays) {
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if(overlays != null) |
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this.overlaysGeom = GeometryUtil.geomToJTS(overlays);
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} |
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/**
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* clips feature's geometry with the clipping geometry, preserving
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* feature's original attributes.
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* If feature's geometry doesn't touch clipping geometry, it will be
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* ignored.
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*/
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public EditableFeature invoke(org.gvsig.fmap.geom.Geometry g, Feature feature) {
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if(g == null) |
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return lastEditFeature;
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com.vividsolutions.jts.geom.Geometry jtsGeom = GeometryUtil.geomToJTS(g); |
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try {
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if(overlaysGeom == null) |
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return persister.addFeature(feature, jtsGeom);
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if(!jtsGeom.getEnvelope().intersects(overlaysGeom.getEnvelope())) {
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lastEditFeature = persister.addFeature(feature, jtsGeom); |
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return lastEditFeature;
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} |
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if(jtsGeom.intersects(overlaysGeom)) {
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Geometry newGeom = EnhancedPrecisionOp.difference(jtsGeom, overlaysGeom); |
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if(!newGeom.isEmpty())
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lastEditFeature = persister.addFeature(feature, newGeom); |
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} else
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lastEditFeature = persister.addFeature(feature, jtsGeom); |
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} catch (CreateGeometryException e) {
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Sextante.addErrorToLog(e); |
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} catch (DataException e) {
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Sextante.addErrorToLog(e); |
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} |
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return lastEditFeature;
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} |
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/**
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* clips feature's geometry with the clipping geometry, preserving
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* feature's original attributes.
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* If feature's geometry doesn't touch clipping geometry, it will be
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* ignored.
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*/
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public void invoke(org.gvsig.fmap.geom.Geometry g, EditableFeature feature) { |
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if(g == null) |
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return;
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com.vividsolutions.jts.geom.Geometry jtsGeom = GeometryUtil.geomToJTS(g); |
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try {
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if(overlaysGeom == null) |
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persister.addFeature(feature, jtsGeom); |
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if(!jtsGeom.getEnvelope().intersects(overlaysGeom.getEnvelope()))
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persister.addFeature(feature, jtsGeom); |
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if(jtsGeom.intersects(overlaysGeom)) {
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try {
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Geometry newGeom = EnhancedPrecisionOp.difference(jtsGeom, overlaysGeom); |
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persister.addFeature(feature, newGeom); |
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} catch (CreateGeometryException e) {
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Sextante.addErrorToLog(e); |
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} catch (DataException e) {
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Sextante.addErrorToLog(e); |
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} |
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} else
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persister.addFeature(feature, jtsGeom); |
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} catch (DataException e) {
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Sextante.addErrorToLog(e); |
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} catch (CreateGeometryException e) {
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Sextante.addErrorToLog(e); |
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} |
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} |
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} |
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