/*
* 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 java.io.File;
import whitebox.geospatialfiles.ShapeFile;
import whitebox.geospatialfiles.shapefile.PolyLineM;
import whitebox.geospatialfiles.shapefile.PolyLineZ;
import whitebox.geospatialfiles.shapefile.ShapeFileRecord;
import whitebox.geospatialfiles.shapefile.ShapeType;
import whitebox.interfaces.WhiteboxPlugin;
import whitebox.interfaces.WhiteboxPluginHost;
import whitebox.utilities.FileUtilities;
/**
* This tool will convert a shapefile containing polygons to a shapefile containing lines.
*
* @author Dr. John Lindsay email: jlindsay@uoguelph.ca
*/
public class PolygonsToLines 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 "PolygonsToLines";
}
/**
* 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 "Polygons To Lines";
}
/**
* Used to retrieve a short description of what the plugin tool does.
*
* @return String containing the plugin's description.
*/
@Override
public String getToolDescription() {
return "Converts vector polygons to vector lines";
}
/**
* Used to identify which toolboxes this plugin tool should be listed in.
*
* @return Array of Strings.
*/
@Override
public String[] getToolbox() {
String[] ret = { "ConversionTools" };
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() {
amIActive = true;
String inputFile;
String outputFile;
double x, y;
int progress;
int n;
int featureNum, numFeatures;
int oneHundredthTotal;
ShapeType shapeType, outputShapeType;
if (args.length <= 0) {
showFeedback("Plugin parameters have not been set.");
return;
}
inputFile = args[0];
outputFile = args[1];
// 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) {
showFeedback("This tool only works with shapefiles of a polygon base shape type.");
return;
}
// set up the output files of the shapefile and the dbf
outputShapeType = ShapeType.POLYLINE;
if (shapeType == ShapeType.POLYGONZ) {
outputShapeType = ShapeType.POLYLINEZ;
} else if (shapeType == ShapeType.POLYGONM) {
outputShapeType = ShapeType.POLYLINEM;
}
ShapeFile output = new ShapeFile(outputFile, outputShapeType);
output.setProjectionStringFromOtherShapefile(input);
FileUtilities.copyFile(new File(input.getDatabaseFile()), new File(output.getDatabaseFile()));
numFeatures = input.getNumberOfRecords();
oneHundredthTotal = numFeatures / 100;
//featureNum = 0;
n = 0;
progress = 0;
byte[] rawData;
whitebox.geospatialfiles.shapefile.Geometry recGeometry;
for (ShapeFileRecord record : input.records) {
//featureNum++;
rawData = record.getGeometry().toByteBuffer().array();
switch (outputShapeType) {
case POLYLINE:
recGeometry = new whitebox.geospatialfiles.shapefile.PolyLine(rawData);
break;
case POLYLINEZ:
recGeometry = new PolyLineZ(rawData);
break;
default: //case POLYLINEM:
recGeometry = new PolyLineM(rawData);
break;
}
output.addRecord(recGeometry);
n++;
if (n >= oneHundredthTotal) {
n = 0;
if (cancelOp) {
cancelOperation();
return;
}
progress++;
updateProgress(progress);
}
}
output.write();
// returning a header file string displays the vector.
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.
// public static void main(String[] args) {
// args = new String[2];
// args[0] = "/Users/johnlindsay/Documents/Data/ShapeFiles/someLakes.shp";
// args[1] = "/Users/johnlindsay/Documents/Data/ShapeFiles/tmp5.shp";
//
// PolygonsToLines p2l = new PolygonsToLines();
// p2l.setArgs(args);
// p2l.run();
// }
}