Source Code Cross Referenced for LineNoderPlugIn.java in  » GIS » openjump » com » vividsolutions » jump » plugin » edit » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » GIS » openjump » com.vividsolutions.jump.plugin.edit 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * The Unified Mapping Platform (JUMP) is an extensible, interactive GUI
003:         * for visualizing and manipulating spatial features with geometry and attributes.
004:         *
005:         * Copyright (C) 2003 Vivid Solutions
006:         *
007:         * This program is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU General Public License
009:         * as published by the Free Software Foundation; either version 2
010:         * of the License, or (at your option) any later version.
011:         *
012:         * This program is distributed in the hope that it will be useful,
013:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
014:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
015:         * GNU General Public License for more details.
016:         *
017:         * You should have received a copy of the GNU General Public License
018:         * along with this program; if not, write to the Free Software
019:         * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
020:         *
021:         * For more information, contact:
022:         *
023:         * Vivid Solutions
024:         * Suite #1A
025:         * 2328 Government Street
026:         * Victoria BC  V8T 5G5
027:         * Canada
028:         *
029:         * (250)385-6040
030:         * www.vividsolutions.com
031:         */
032:        package com.vividsolutions.jump.plugin.edit;
033:
034:        import java.awt.Color;
035:        import javax.swing.ImageIcon;
036:        import javax.swing.JComboBox;
037:
038:        import java.util.*;
039:
040:        import com.vividsolutions.jump.I18N;
041:        import com.vividsolutions.jump.workbench.*;
042:        import com.vividsolutions.jump.workbench.model.*;
043:        import com.vividsolutions.jump.workbench.plugin.*;
044:        import com.vividsolutions.jump.workbench.ui.GUIUtil;
045:        import com.vividsolutions.jump.workbench.ui.MultiInputDialog;
046:        import com.vividsolutions.jump.workbench.ui.plugin.*;
047:        import com.vividsolutions.jump.feature.*;
048:        import com.vividsolutions.jts.util.*;
049:        import com.vividsolutions.jts.geom.*;
050:        import com.vividsolutions.jts.operation.polygonize.*;
051:        import com.vividsolutions.jts.geom.util.LinearComponentExtracter;
052:        import com.vividsolutions.jump.task.*;
053:        import com.vividsolutions.jump.workbench.ui.*;
054:
055:        public class LineNoderPlugIn extends ThreadedBasePlugIn {
056:            private boolean useSelected = false;
057:
058:            private MultiInputDialog dialog;
059:            private String layerName;
060:
061:            private GeometryFactory fact = new GeometryFactory();
062:
063:            public LineNoderPlugIn() {
064:            }
065:
066:            /**
067:             * Returns a very brief description of this task.
068:             * @return the name of this task
069:             */
070:            public String getName() {
071:                return I18N.get("jump.plugin.edit.LineNoderPlugIn.Node-Lines");
072:            }
073:
074:            public EnableCheck createEnableCheck(
075:                    WorkbenchContext workbenchContext) {
076:                EnableCheckFactory checkFactory = new EnableCheckFactory(
077:                        workbenchContext);
078:                return new MultiEnableCheck()
079:                        .add(
080:                                checkFactory
081:                                        .createWindowWithLayerManagerMustBeActiveCheck())
082:                        .add(checkFactory.createAtLeastNLayersMustExistCheck(1));
083:            }
084:
085:            public boolean execute(PlugInContext context) throws Exception {
086:                dialog = new MultiInputDialog(context.getWorkbenchFrame(),
087:                        getName(), true);
088:                setDialogValues(dialog, context);
089:                GUIUtil.centreOnWindow(dialog);
090:                dialog.setVisible(true);
091:                if (!dialog.wasOKPressed()) {
092:                    return false;
093:                }
094:                getDialogValues(dialog);
095:                return true;
096:            }
097:
098:            public void run(TaskMonitor monitor, PlugInContext context)
099:                    throws Exception {
100:                monitor.allowCancellationRequests();
101:
102:                Polygonizer polygonizer = new Polygonizer();
103:                //    polygonizer.setSplitLineStrings(splitLineStrings);
104:
105:                monitor.report(I18N
106:                        .get("jump.plugin.edit.LineNoderPlugIn.Noding"));
107:
108:                Layer layer = dialog.getLayer(SRC_LAYER);
109:
110:                Collection inputFeatures = getFeaturesToProcess(layer, context);
111:
112:                Collection lines = getLines(inputFeatures);
113:
114:                monitor
115:                        .report(I18N
116:                                .get("jump.plugin.edit.LineNoderPlugIn.Noding-input-lines"));
117:                Geometry nodedGeom = nodeLines((List) lines);
118:                Collection nodedLines = toLines(nodedGeom);
119:
120:                if (monitor.isCancelRequested())
121:                    return;
122:                createLayer(context, nodedLines);
123:            }
124:
125:            private Collection getFeaturesToProcess(Layer lyr,
126:                    PlugInContext context) {
127:                if (useSelected)
128:                    return context.getLayerViewPanel().getSelectionManager()
129:                            .getFeaturesWithSelectedItems(lyr);
130:                return lyr.getFeatureCollectionWrapper().getFeatures();
131:            }
132:
133:            private Collection getLines(Collection inputFeatures) {
134:                List linesList = new ArrayList();
135:                LinearComponentExtracter lineFilter = new LinearComponentExtracter(
136:                        linesList);
137:                for (Iterator i = inputFeatures.iterator(); i.hasNext();) {
138:                    Feature f = (Feature) i.next();
139:                    Geometry g = f.getGeometry();
140:                    g.apply(lineFilter);
141:                }
142:                return linesList;
143:            }
144:
145:            /**
146:             * Nodes a collection of linestrings.
147:             * Noding is done via JTS union, which is reasonably effective but
148:             * may exhibit robustness failures.
149:             *
150:             * @param lines the linear geometries to node
151:             * @return a collection of linear geometries, noded together
152:             */
153:            private Geometry nodeLines(Collection lines) {
154:                Geometry linesGeom = fact.createMultiLineString(fact
155:                        .toLineStringArray(lines));
156:
157:                Geometry unionInput = fact.createMultiLineString(null);
158:                // force the unionInput to be non-empty if possible, to ensure union is not optimized away
159:                Geometry minLine = extractPoint(lines);
160:                if (minLine != null)
161:                    unionInput = minLine;
162:
163:                Geometry noded = linesGeom.union(unionInput);
164:                return noded;
165:            }
166:
167:            private static List toLines(Geometry geom) {
168:                List linesList = new ArrayList();
169:                LinearComponentExtracter lineFilter = new LinearComponentExtracter(
170:                        linesList);
171:                geom.apply(lineFilter);
172:                return linesList;
173:            }
174:
175:            private Geometry extractPoint(Collection lines) {
176:                int minPts = Integer.MAX_VALUE;
177:                Geometry point = null;
178:                // extract first point from first non-empty geometry
179:                for (Iterator i = lines.iterator(); i.hasNext();) {
180:                    Geometry g = (Geometry) i.next();
181:                    if (!g.isEmpty()) {
182:                        Coordinate p = g.getCoordinate();
183:                        point = g.getFactory().createPoint(p);
184:                    }
185:                }
186:                return point;
187:            }
188:
189:            private void createLayer(PlugInContext context,
190:                    Collection nodedLines) throws Exception {
191:                FeatureCollection polyFC = FeatureDatasetFactory
192:                        .createFromGeometry(nodedLines);
193:                context
194:                        .addLayer(
195:                                StandardCategoryNames.RESULT,
196:                                layerName
197:                                        + " "
198:                                        + I18N
199:                                                .get("jump.plugin.edit.LineNoderPlugIn.Noded-Lines"),
200:                                polyFC);
201:            }
202:
203:            private final static String SRC_LAYER = I18N
204:                    .get("jump.plugin.edit.LineNoderPlugIn.Line-Layer");
205:            private final static String SELECTED_ONLY = GenericNames.USE_SELECTED_FEATURES_ONLY;
206:
207:            private void setDialogValues(MultiInputDialog dialog,
208:                    PlugInContext context) {
209:                dialog.setSideBarImage(new ImageIcon(getClass().getResource(
210:                        "Polygonize.png")));
211:                dialog
212:                        .setSideBarDescription(I18N
213:                                .get("jump.plugin.edit.LineNoderPlugIn.Nodes-the-lines-in-a-layer"));
214:                String fieldName = SRC_LAYER;
215:                JComboBox addLayerComboBox = dialog.addLayerComboBox(fieldName,
216:                        context.getCandidateLayer(0), null, context
217:                                .getLayerManager());
218:                dialog.addCheckBox(SELECTED_ONLY, useSelected);
219:            }
220:
221:            private void getDialogValues(MultiInputDialog dialog) {
222:                Layer layer = dialog.getLayer(SRC_LAYER);
223:                layerName = layer.getName();
224:                useSelected = dialog.getBoolean(SELECTED_ONLY);
225:            }
226:        }
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