/*
* 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 whitebox.geospatialfiles.ShapeFile;
import whitebox.geospatialfiles.shapefile.attributes.DBFField;
import whitebox.geospatialfiles.shapefile.attributes.AttributeTable;
import whitebox.geospatialfiles.shapefile.ShapeFileRecord;
import whitebox.geospatialfiles.shapefile.ShapeType;
import whitebox.interfaces.WhiteboxPlugin;
import whitebox.interfaces.WhiteboxPluginHost;
/**
* This can be used to identify the centroid point of a vector polyline or polygon feature or a group of vector points.
*
* @author Dr. John Lindsay email: jlindsay@uoguelph.ca
*/
public class CentroidVector 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 "CentroidVector";
}
/**
* 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 "Centroid (Vector)";
}
/**
* Used to retrieve a short description of what the plugin tool does.
*
* @return String containing the plugin's description.
*/
@Override
public String getToolDescription() {
return "Identifies the centroid point of a group of input vector polygons.";
}
/**
* Used to identify which toolboxes this plugin tool should be listed in.
*
* @return Array of Strings.
*/
@Override
public String[] getToolbox() {
String[] ret = {"PatchShapeTools", "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() {
amIActive = true;
String inputFile;
String outputFile;
int progress;
int i, j, n;
int oneHundredthTotal;
int numRecs;
int FID = 0;
ShapeType shapeType;
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();
if (shapeType.getBaseType() != ShapeType.POLYGON && shapeType.getBaseType() != ShapeType.POLYLINE) {
showFeedback("The input shapefile must have a POLYLINE or POLYGON shape type.");
return;
}
numRecs = input.getNumberOfRecords();
oneHundredthTotal = numRecs / 100;
// set up the output files of the shapefile and the dbf
//DBFReader reader = new DBFReader(input.getDatabaseFile());
AttributeTable reader = input.getAttributeTable();
int numFields = reader.getFieldCount();
DBFField[] fields = reader.getAllFields();
//String DBFName = output.getDatabaseFile();
//DBFWriter writer = new DBFWriter(new File(DBFName));
//AttributeTable writer = output.getAttributeTable();
//writer.setFields(fields);
ShapeFile output = new ShapeFile(outputFile, ShapeType.POINT, fields);
output.setProjectionStringFromOtherShapefile(input);
// now read in all of the attributes data
Object[][] attributeTableRecords = new Object[numRecs][numFields];
Object[] dataRow;
int a = 0;
while ((dataRow = reader.nextRecord()) != null) {
System.arraycopy(dataRow, 0, attributeTableRecords[a], 0, numFields);
a++;
}
com.vividsolutions.jts.geom.Point p = null;
com.vividsolutions.jts.geom.Geometry[] JTSGeometries = null;
n = 0;
progress = 0;
for (ShapeFileRecord record : input.records) {
if (record.getShapeType() != ShapeType.NULLSHAPE) {
JTSGeometries = record.getGeometry().getJTSGeometries();
for (a = 0; a < JTSGeometries.length; a++) {
p = JTSGeometries[a].getCentroid();
Coordinate pCoord = p.getCoordinate();
whitebox.geospatialfiles.shapefile.Point wbGeometry = new whitebox.geospatialfiles.shapefile.Point(pCoord.x, pCoord.y);
Object[] rowData = attributeTableRecords[record.getRecordNumber() - 1];
output.addRecord(wbGeometry, rowData);
}
}
n++;
if (n >= oneHundredthTotal) {
n = 0;
if (cancelOp) {
cancelOperation();
return;
}
progress++;
updateProgress("Reading shapefile data:", progress);
}
}
output.write();
// returning a header file string displays the image.
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/Downloads/canvec_023i07_shp/023i07_5_0_HD_1460009_0.shp";
// args[1] = "/Users/johnlindsay/Downloads/canvec_023i07_shp/tmp3.shp";
//
// VoronoiDiagram vd = new VoronoiDiagram();
// vd.setArgs(args);
// vd.run();
// }
}