/*
* Copyright (C) 2011-2012 Dr. John Lindsay <jlindsay@uoguelph.ca>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package plugins;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.geom.LineString;
import com.vividsolutions.jts.simplify.DouglasPeuckerSimplifier;
import java.util.ArrayList;
import whitebox.geospatialfiles.ShapeFile;
import whitebox.geospatialfiles.shapefile.PointsList;
import whitebox.geospatialfiles.shapefile.ShapeFileRecord;
import whitebox.geospatialfiles.shapefile.ShapeType;
import whitebox.geospatialfiles.shapefile.ShapefilePoint;
import whitebox.geospatialfiles.shapefile.attributes.DBFField;
import whitebox.interfaces.WhiteboxPlugin;
import whitebox.interfaces.WhiteboxPluginHost;
import whitebox.utilities.Topology;
/**
* This uses the Douglas and Peucker (1973) algorithm to simplify vector line or polygon features.
*
* @author Dr. John Lindsay email: jlindsay@uoguelph.ca
*/
public class SimplifyLineOrPolygon implements WhiteboxPlugin {
private WhiteboxPluginHost myHost = null;
private String[] args;
/**
* Used to retrieve the plugin tool's name. This is a short, unique name
* containing no spaces.
*
* @return String containing plugin name.
*/
@Override
public String getName() {
return "SimplifyLineOrPolygon";
}
/**
* Used to retrieve the plugin tool's descriptive name. This can be a longer
* name (containing spaces) and is used in the interface to list the tool.
*
* @return String containing the plugin descriptive name.
*/
@Override
public String getDescriptiveName() {
return "Simplify Line Or Polygon";
}
/**
* Used to retrieve a short description of what the plugin tool does.
*
* @return String containing the plugin's description.
*/
@Override
public String getToolDescription() {
return "Simplifies line or polygon features";
}
/**
* Used to identify which toolboxes this plugin tool should be listed in.
*
* @return Array of Strings.
*/
@Override
public String[] getToolbox() {
String[] ret = {"VectorTools"};
return ret;
}
/**
* Sets the WhiteboxPluginHost to which the plugin tool is tied. This is the
* class that the plugin will send all feedback messages, progress updates,
* and return objects.
*
* @param host The WhiteboxPluginHost that called the plugin tool.
*/
@Override
public void setPluginHost(WhiteboxPluginHost host) {
myHost = host;
}
/**
* Used to communicate feedback pop-up messages between a plugin tool and
* the main Whitebox user-interface.
*
* @param feedback String containing the text to display.
*/
private void showFeedback(String message) {
if (myHost != null) {
myHost.showFeedback(message);
} else {
System.out.println(message);
}
}
/**
* Used to communicate a return object from a plugin tool to the main
* Whitebox user-interface.
*
* @return Object, such as an output WhiteboxRaster.
*/
private void returnData(Object ret) {
if (myHost != null) {
myHost.returnData(ret);
}
}
private int previousProgress = 0;
private String previousProgressLabel = "";
/**
* Used to communicate a progress update between a plugin tool and the main
* Whitebox user interface.
*
* @param progressLabel A String to use for the progress label.
* @param progress Float containing the progress value (between 0 and 100).
*/
private void updateProgress(String progressLabel, int progress) {
if (myHost != null && ((progress != previousProgress)
|| (!progressLabel.equals(previousProgressLabel)))) {
myHost.updateProgress(progressLabel, progress);
}
previousProgress = progress;
previousProgressLabel = progressLabel;
}
/**
* Used to communicate a progress update between a plugin tool and the main
* Whitebox user interface.
*
* @param progress Float containing the progress value (between 0 and 100).
*/
private void updateProgress(int progress) {
if (myHost != null && progress != previousProgress) {
myHost.updateProgress(progress);
}
previousProgress = progress;
}
/**
* Sets the arguments (parameters) used by the plugin.
*
* @param args An array of string arguments.
*/
@Override
public void setArgs(String[] args) {
this.args = args.clone();
}
private boolean cancelOp = false;
/**
* Used to communicate a cancel operation from the Whitebox GUI.
*
* @param cancel Set to true if the plugin should be canceled.
*/
@Override
public void setCancelOp(boolean cancel) {
cancelOp = cancel;
}
private void cancelOperation() {
showFeedback("Operation cancelled.");
updateProgress("Progress: ", 0);
}
private boolean amIActive = false;
/**
* Used by the Whitebox GUI to tell if this plugin is still running.
*
* @return a boolean describing whether or not the plugin is actively being
* used.
*/
@Override
public boolean isActive() {
return amIActive;
}
/**
* Used to execute this plugin tool.
*/
@Override
public void run() {
/*
* This tool places the nodes (vertices) from a shapefile of polygons or
* lines into a shapefile of Point ShapeType.
*/
amIActive = true;
String inputFile;
String outputFile;
int progress;
int i, n;
int numFeatures;
int oneHundredthTotal;
ShapeType shapeType, outputShapeType;
GeometryFactory factory = new GeometryFactory();
double distTolerance = 10;
boolean loseNoFeatures = false;
if (args.length <= 0) {
showFeedback("Plugin parameters have not been set.");
return;
}
inputFile = args[0];
outputFile = args[1];
distTolerance = Double.parseDouble(args[2]);
loseNoFeatures = Boolean.parseBoolean(args[3]);
// check to see that the inputHeader and outputHeader are not null.
if ((inputFile == null) || (outputFile == null)) {
showFeedback("One or more of the input parameters have not been set properly.");
return;
}
try {
// set up the input shapefile.
ShapeFile input = new ShapeFile(inputFile);
shapeType = input.getShapeType();
// make sure that the shapetype is either a flavour of polyline or polygon.
if (shapeType.getBaseType() != ShapeType.POLYGON && shapeType.getBaseType() != ShapeType.POLYLINE) {
showFeedback("This tool only works with shapefiles of a polygon or line base shape type.");
return;
}
// set up the output files of the shapefile and the dbf
if (shapeType.getBaseType() == ShapeType.POLYGON) {
outputShapeType = ShapeType.POLYGON;
} else if (shapeType.getBaseType() == ShapeType.POLYLINE) {
outputShapeType = ShapeType.POLYLINE;
} else {
showFeedback("This tool only works with shapefiles of a polygon or line base shape type.");
return;
}
int numOutputFields = input.getAttributeTable().getFieldCount() + 1;
int numInputFields = input.getAttributeTable().getFieldCount();
DBFField[] inputFields = input.getAttributeTable().getAllFields();
DBFField fields[] = new DBFField[numOutputFields];
fields[0] = new DBFField();
fields[0].setName("PARENT_ID");
fields[0].setDataType(DBFField.DBFDataType.NUMERIC);
fields[0].setFieldLength(10);
fields[0].setDecimalCount(0);
System.arraycopy(inputFields, 0, fields, 1, numInputFields);
ShapeFile output = new ShapeFile(outputFile, outputShapeType, fields);
output.setProjectionStringFromOtherShapefile(input);
numFeatures = input.getNumberOfRecords();
oneHundredthTotal = numFeatures / 100;
n = 0;
progress = 0;
com.vividsolutions.jts.geom.Geometry[] recJTS = null;
int recordNum;
for (ShapeFileRecord record : input.records) {
recordNum = record.getRecordNumber();
Object[] attData = input.getAttributeTable().getRecord(recordNum - 1);
//featureNum++;
recJTS = record.getGeometry().getJTSGeometries();
ArrayList<com.vividsolutions.jts.geom.Geometry> geomList = new ArrayList<>();
for (int a = 0; a < recJTS.length; a++) {
geomList.add(recJTS[a]);
}
DouglasPeuckerSimplifier dps = new DouglasPeuckerSimplifier(factory.buildGeometry(geomList));
dps.setDistanceTolerance(distTolerance);
com.vividsolutions.jts.geom.Geometry outputGeom = dps.getResultGeometry();
if (outputGeom.isEmpty() && loseNoFeatures) {
outputGeom = factory.buildGeometry(geomList);
}
if (!outputGeom.isEmpty()) {
for (int a = 0; a < outputGeom.getNumGeometries(); a++) {
//parentRecNum = 0;
com.vividsolutions.jts.geom.Geometry g = outputGeom.getGeometryN(a);
if (g instanceof com.vividsolutions.jts.geom.Polygon && !g.isEmpty()) {
com.vividsolutions.jts.geom.Polygon p = (com.vividsolutions.jts.geom.Polygon) g;
ArrayList<ShapefilePoint> pnts = new ArrayList<>();
int[] parts = new int[p.getNumInteriorRing() + 1];
Coordinate[] buffCoords = p.getExteriorRing().getCoordinates();
if (!Topology.isLineClosed(buffCoords)) {
System.out.println("Exterior ring not closed.");
}
if (Topology.isClockwisePolygon(buffCoords)) {
for (i = 0; i < buffCoords.length; i++) {
pnts.add(new ShapefilePoint(buffCoords[i].x, buffCoords[i].y));
}
} else {
for (i = buffCoords.length - 1; i >= 0; i--) {
pnts.add(new ShapefilePoint(buffCoords[i].x, buffCoords[i].y));
}
}
for (int b = 0; b < p.getNumInteriorRing(); b++) {
parts[b + 1] = pnts.size();
buffCoords = p.getInteriorRingN(b).getCoordinates();
if (!Topology.isLineClosed(buffCoords)) {
System.out.println("Interior ring not closed.");
}
if (Topology.isClockwisePolygon(buffCoords)) {
for (i = buffCoords.length - 1; i >= 0; i--) {
pnts.add(new ShapefilePoint(buffCoords[i].x, buffCoords[i].y));
}
} else {
for (i = 0; i < buffCoords.length; i++) {
pnts.add(new ShapefilePoint(buffCoords[i].x, buffCoords[i].y));
}
}
}
PointsList pl = new PointsList(pnts);
whitebox.geospatialfiles.shapefile.Polygon wbPoly = new whitebox.geospatialfiles.shapefile.Polygon(parts, pl.getPointsArray());
Object[] rowData = new Object[numOutputFields];
rowData[0] = new Double(recordNum - 1);
System.arraycopy(attData, 0, rowData, 1, numInputFields);
output.addRecord(wbPoly, rowData);
} else if (g instanceof com.vividsolutions.jts.geom.LineString && !g.isEmpty()) {
LineString ls = (LineString) g;
ArrayList<ShapefilePoint> pnts = new ArrayList<>();
int[] parts = {0};
Coordinate[] coords = ls.getCoordinates();
for (i = 0; i < coords.length; i++) {
pnts.add(new ShapefilePoint(coords[i].x, coords[i].y));
}
PointsList pl = new PointsList(pnts);
whitebox.geospatialfiles.shapefile.PolyLine wbGeometry = new whitebox.geospatialfiles.shapefile.PolyLine(parts, pl.getPointsArray());
Object[] rowData = new Object[numOutputFields];
rowData[0] = new Double(recordNum - 1);
System.arraycopy(attData, 0, rowData, 1, numInputFields);
output.addRecord(wbGeometry, rowData);
}
}
}
n++;
if (n >= oneHundredthTotal) {
n = 0;
if (cancelOp) {
cancelOperation();
return;
}
progress++;
updateProgress(progress);
}
}
output.write();
// returning a header file string displays the image.
updateProgress("Displaying vector: ", 0);
returnData(outputFile);
} catch (OutOfMemoryError oe) {
myHost.showFeedback("An out-of-memory error has occurred during operation.");
} catch (Exception e) {
myHost.showFeedback("An error has occurred during operation. See log file for details.");
myHost.logException("Error in " + getDescriptiveName(), e);
} finally {
updateProgress("Progress: ", 0);
// tells the main application that this process is completed.
amIActive = false;
myHost.pluginComplete();
}
}
// /**
// * This method is only used during testing.
// */
// //This method is only used during testing.
// public static void main(String[] args) {
// args = new String[4];
// //args[0] = "/Users/johnlindsay/Documents/Research/Contracts/NRCan 2012/65E UTM.shp";
// //args[1] = "/Users/johnlindsay/Documents/Research/Contracts/NRCan 2012/tmp1.shp";
// //args[0] = "/Users/johnlindsay/Documents/Data/ShapeFiles/Water_Body_rmow.shp";
// //args[1] = "/Users/johnlindsay/Documents/Data/ShapeFiles/tmp4.shp";
//
// args[0] = "/Users/johnlindsay/Documents/Research/Contracts/NRCan 2012/Data/alllakesutmdissolve.shp";
// args[1] = "/Users/johnlindsay/Documents/Research/Contracts/NRCan 2012/Data/tmp1.shp";
//
// args[2] = "15";
// args[3] = "true";
//
// SimplifyLineOrPolygon slp = new SimplifyLineOrPolygon();
// slp.setArgs(args);
// slp.run();
// }
}