/*
* 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.util.Date;
import whitebox.geospatialfiles.ShapeFile;
import whitebox.geospatialfiles.WhiteboxRaster;
import whitebox.geospatialfiles.shapefile.PolygonM;
import whitebox.geospatialfiles.shapefile.PolygonZ;
import whitebox.geospatialfiles.shapefile.ShapeFileRecord;
import whitebox.geospatialfiles.shapefile.ShapeType;
import whitebox.geospatialfiles.shapefile.attributes.DBFField;
import whitebox.interfaces.WhiteboxPlugin;
import whitebox.interfaces.WhiteboxPluginHost;
/**
* This tool can be used to measure the length of the perimeter of polygon features in a raster or vector layer.
* @author Dr. John Lindsay email: jlindsay@uoguelph.ca
*/
public class Perimeter implements WhiteboxPlugin {
private WhiteboxPluginHost myHost;
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 "Perimeter";
}
/**
* 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 "Perimeter";
}
/**
* Used to retrieve a short description of what the plugin tool does.
* @return String containing the plugin's description.
*/
@Override
public String getToolDescription() {
return "Calculates the perimeter of polygons or classes.";
}
/**
* Used to identify which toolboxes this plugin tool should be listed in.
* @return Array of Strings.
*/
@Override
public String[] getToolbox() {
String[] ret = { "PatchShapeTools" };
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 feedback) {
if (myHost != null) {
myHost.showFeedback(feedback);
} else {
System.out.println(feedback);
}
}
/**
* 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);
}
}
/**
* 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) {
myHost.updateProgress(progressLabel, progress);
} else {
System.out.println(progressLabel + " " + progress + "%");
}
}
/**
* 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) {
myHost.updateProgress(progress);
} else {
System.out.println("Progress: " + 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;
}
private void calculateRaster() {
amIActive = true;
String inputHeader = null;
String outputHeader = null;
int col;
int row;
int i;
int j;
int cols;
int rows;
int a;
int[] dX = {-1, 0, 1, -1, 1, -1, 0, 1};
int[] dY = {-1, -1, -1, 0, 0, 1, 1, 1};
int[] val = {1, 2, 4, 8, 16, 32, 64, 128};
double z;
int val1;
int val2;
float progress;
int minVal;
int maxVal;
int range;
boolean zeroAsBackground = false;
boolean blnTextOutput = false;
double gridRes;
String XYUnits;
double[] LUT = {4.000000000, 2.828427125, 2.236067977, 2.414213562, 2.828427125, 3.000000000,
2.414213562, 2.236067977, 2.236067977, 2.414213562, 2.000000000,
2.000000000, 2.828427125, 1.414213562, 1.414213562, 1.414213562,
2.236067977, 2.828427125, 2.000000000, 1.414213562, 2.414213562,
1.414213562, 2.000000000, 1.414213562, 2.000000000, 2.000000000,
1.000000000, 2.000000000, 2.000000000, 2.000000000, 2.000000000,
1.000000000, 2.828427125, 3.000000000, 2.828427125, 1.414213562,
2.000000000, 4.000000000, 2.236067977, 2.236067977, 2.414213562,
2.236067977, 1.414213562, 1.414213562, 2.236067977, 2.236067977,
1.414213562, 1.414213562, 2.828427125, 2.236067977, 1.414213562,
1.414213562, 2.236067977, 2.414213562, 2.000000000, 1.414213562, 2.000000000, 2.000000000, 1.000000000,
1.414213562, 2.000000000, 2.000000000, 1.000000000, 1.000000000, 2.236067977, 2.828427125, 2.000000000,
2.000000000, 2.828427125, 2.236067977, 2.000000000, 2.000000000, 2.000000000, 1.414213562, 1.000000000,
2.000000000, 1.414213562, 1.414213562, 1.000000000, 1.414213562, 2.000000000, 1.414213562,
1.000000000, 1.000000000, 1.414213562, 1.414213562, 2.000000000, 1.414213562, 1.000000000, 1.000000000,
0.000000000, 0.000000000, 1.000000000, 1.000000000, 0.000000000, 0.000000000, 2.414213562, 1.414213562,
2.000000000, 2.000000000, 2.236067977, 2.414213562, 2.000000000, 2.000000000, 2.000000000, 1.414213562,
2.000000000, 1.000000000, 2.000000000, 1.414213562, 1.000000000, 1.000000000, 1.414213562, 1.414213562,
1.000000000, 1.000000000, 1.414213562, 1.414213562, 1.000000000, 1.000000000, 2.000000000, 1.414213562,
0.000000000, 0.000000000, 1.000000000, 1.000000000, 0.000000000, 0.000000000, 2.828427125, 2.000000000,
2.828427125, 2.236067977, 3.000000000, 4.000000000, 1.414213562, 2.236067977,
2.828427125, 2.236067977, 1.414213562, 2.000000000, 2.236067977, 2.414213562, 1.414213562, 1.414213562,
2.414213562, 2.236067977, 1.414213562, 1.414213562, 2.236067977, 2.236067977, 1.414213562, 1.414213562,
2.000000000, 2.000000000, 1.000000000, 1.000000000, 2.000000000, 2.000000000, 1.414213562, 1.000000000,
3.000000000, 4.000000000, 2.236067977, 2.414213562, 4.000000000, 4.000000000, 2.414213562, 2.236067977,
1.414213562, 2.236067977, 1.414213562, 1.414213562, 2.414213562, 2.236067977, 1.414213562, 1.414213562,
1.414213562, 2.414213562, 1.414213562, 1.414213562, 2.236067977, 2.236067977,
1.414213562, 1.414213562, 2.000000000, 2.000000000, 1.000000000, 1.000000000, 2.000000000, 2.000000000,
1.000000000, 1.000000000, 2.414213562, 2.000000000, 2.236067977, 2.000000000, 1.414213562, 2.414213562,
2.000000000, 2.000000000, 1.414213562, 1.414213562, 1.000000000, 1.000000000, 1.414213562, 1.414213562,
1.000000000, 1.000000000, 2.000000000, 2.000000000, 2.000000000, 1.000000000, 1.414213562, 1.414213562,
1.000000000, 1.000000000, 2.000000000, 1.000000000, 0.000000000, 0.000000000, 1.414213562, 1.000000000,
0.000000000, 0.000000000, 2.236067977, 2.236067977, 2.000000000, 2.000000000, 2.236067977, 2.236067977,
2.000000000, 2.000000000, 1.414213562, 1.414213562, 1.414213562, 1.000000000, 1.414213562, 1.414213562,
1.000000000, 1.000000000, 1.414213562, 1.414213562, 1.414213562, 1.000000000, 1.414213562, 1.414213562,
1.000000000, 1.000000000, 1.000000000, 1.000000000, 0.000000000, 0.000000000, 1.000000000, 1.000000000,
0.000000000, 0.000000000};
if (args.length <= 0) {
showFeedback("Plugin parameters have not been set.");
return;
}
// read the input parameters
inputHeader = args[0];
outputHeader = args[1];
blnTextOutput = Boolean.parseBoolean(args[2]);
// check to see that the inputHeader and outputHeader are not null.
if ((inputHeader == null) || (outputHeader == null)) {
showFeedback("One or more of the input parameters have not been set properly.");
return;
}
try {
WhiteboxRaster image = new WhiteboxRaster(inputHeader, "r");
rows = image.getNumberRows();
cols = image.getNumberColumns();
double noData = image.getNoDataValue();
gridRes = (image.getCellSizeX() + image.getCellSizeY()) / 2;
XYUnits = image.getXYUnits();
WhiteboxRaster output = new WhiteboxRaster(outputHeader, "rw", inputHeader, WhiteboxRaster.DataType.FLOAT, noData);
output.setPreferredPalette(image.getPreferredPalette());
minVal = (int) image.getMinimumValue();
maxVal = (int) image.getMaximumValue();
range = maxVal - minVal;
double[] perimeter = new double[range + 1];
for (row = 0; row < rows; row++) {
for (col = 0; col < cols; col++) {
z = image.getValue(row, col);
val2 = 0;
for (a = 0; a < 8; a++) {
i = col + dX[a];
j = row + dY[a];
if (image.getValue(j, i) == z) {
val2 += val[a];
}
}
output.setValue(row, col, LUT[val2]);
}
if (cancelOp) {
cancelOperation();
return;
}
progress = (float) (100f * row / (rows - 1));
updateProgress((int) progress);
}
for (row = 0; row < rows; row++) {
for (col = 0; col < cols; col++) {
z = image.getValue(row, col);
if (z != noData) {
val1 = (int) (z) - minVal;
perimeter[val1] += output.getValue(row, col);
}
}
if (cancelOp) {
cancelOperation();
return;
}
progress = (float) (100f * row / (rows - 1));
updateProgress((int) progress);
}
if (zeroAsBackground) {
perimeter[0 - minVal] = 0;
}
for (a = 0; a < perimeter.length; a++) {
perimeter[a] = perimeter[a] * gridRes;
}
for (row = 0; row < rows; row++) {
for (col = 0; col < cols; col++) {
z = image.getValue(row, col);
if (z != noData) {
val1 = (int) (z) - minVal;
output.setValue(row, col, perimeter[val1]);
} else {
output.setValue(row, col, noData);
}
}
if (cancelOp) {
cancelOperation();
return;
}
progress = (float) (100f * row / (rows - 1));
updateProgress((int) progress);
}
output.addMetadataEntry("Created by the "
+ getDescriptiveName() + " tool.");
output.addMetadataEntry("Created on " + new Date());
image.close();
output.close();
if (blnTextOutput) {
String retstr = "Perimeter Analysis \n Units = " + XYUnits;
for (a = 0; a < perimeter.length; a++) {
if (perimeter[a] > 0) {
retstr = retstr + "\n" + String.valueOf(minVal + a) + "\t" + String.valueOf(perimeter[a]);
}
}
returnData(retstr);
}
// returning a header file string displays the image.
returnData(outputHeader);
} 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();
}
}
private void calculateVector() {
/*
* Notice that this tool assumes that each record in the shapefile is an
* individual polygon. The feature can contain multiple parts only if it
* has holes, i.e. islands. A multipart record cannot contain multiple
* and seperate features. This is because it complicates the calculation
* of feature area and perimeter.
*/
amIActive = true;
// Declare the variable.
String inputFile = null;
int progress;
double perimeter = 0;
int recNum;
if (args.length <= 0) {
showFeedback("Plugin parameters have not been set.");
return;
}
inputFile = args[0];
/*
* args[1], args[2], and args[3] are ignored by the vector tool
*/
// check to see that the inputHeader and outputHeader are not null.
if (inputFile == null) {
showFeedback("One or more of the input parameters have not been set properly.");
return;
}
try {
ShapeFile input = new ShapeFile(inputFile);
double numberOfRecords = input.getNumberOfRecords();
if (input.getShapeType().getBaseType() != ShapeType.POLYGON) {
showFeedback("This function can only be applied to polygon type shapefiles.");
return;
}
/* create a new field in the input file's database
to hold the fractal dimension. Put it at the end
of the database. */
DBFField field = new DBFField();
field = new DBFField();
field.setName("PERIMETER");
field.setDataType(DBFField.DBFDataType.NUMERIC);
field.setFieldLength(10);
field.setDecimalCount(4);
input.getAttributeTable().addField(field);
// initialize the shapefile.
ShapeType inputType = input.getShapeType();
for (ShapeFileRecord record : input.records) {
switch (inputType) {
case POLYGON:
whitebox.geospatialfiles.shapefile.Polygon recPolygon =
(whitebox.geospatialfiles.shapefile.Polygon) (record.getGeometry());
perimeter = recPolygon.getPerimeter();
break;
case POLYGONZ:
PolygonZ recPolygonZ = (PolygonZ) (record.getGeometry());
perimeter = recPolygonZ.getPerimeter();
break;
case POLYGONM:
PolygonM recPolygonM = (PolygonM) (record.getGeometry());
perimeter = recPolygonM.getPerimeter();
break;
}
recNum = record.getRecordNumber() - 1;
Object[] recData = input.getAttributeTable().getRecord(recNum);
recData[recData.length - 1] = new Double(perimeter);
input.getAttributeTable().updateRecord(recNum, recData);
if (cancelOp) {
cancelOperation();
return;
}
progress = (int) (record.getRecordNumber() / numberOfRecords * 100);
updateProgress(progress);
}
// returning the database file will result in it being opened in the Whitebox GUI.
returnData(input.getDatabaseFile());
} 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();
}
}
/**
* Used to execute this plugin tool.
*/
@Override
public void run() {
amIActive = true;
String inputFile = args[0];
if (inputFile.toLowerCase().contains(".dep")) {
calculateRaster();
} else if (inputFile.toLowerCase().contains(".shp")) {
calculateVector();
} else {
showFeedback("There was a problem reading the input file.");
}
}
// /**
// * This method is only used during testing.
// */
//
// // This method is only used during testing.
// public static void main(String[] args) {
//
// // vector-based test
// args = new String[4];
// /*
// * specify the input args array as: args[0] = inputFile
// * args[1] = outputFile (parameter ignored in the vector algorithm)
// * args[2] = blnTextOutput (This parameter is ignored in the
// * vector algorithm...only used in the raster tool)
// * args[3] = zeroAsBackground (This parameter is ignored in the vector
// * algorithm...only used in the raster tool)
// */
// args[0] = "/Users/johnlindsay/Documents/Data/Shapefiles/Water_Body_rmow.shp";
// args[1] = "";
// args[2] = "false";
// args[3] = "false";
//
// Perimeter perimeter = new Perimeter();
// perimeter.setArgs(args);
// perimeter.run();
// }
}