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/*
* Copyright (c) 2014, Gerd Petermann
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* 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.
*/
package uk.me.parabola.splitter.kml;
import java.awt.geom.PathIterator;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import java.util.Locale;
import uk.me.parabola.splitter.Area;
import uk.me.parabola.splitter.Utils;
/**
* A class to create kml files from java areas (polygons) or rectangular areas.
* @author GerdP
*
*/
public class KmlWriter
{
private static void writeKmlHeader
(PrintWriter pw
){
pw.
format("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
"<kml xmlns=\"http://www.opengis.net/kml/2.2\">\n" +
"<Document>\n" +
" <Style id=\"transWhitePoly\">\n" +
" <LineStyle>\n" +
" <width>1.5</width>\n" +
" </LineStyle>\n" +
" <PolyStyle>\n" +
" <color>00ffffff</color>\n" +
" <colorMode>normal</colorMode>\n" +
" </PolyStyle>\n" +
" </Style>\n\n");
}
private static void writeLineHeader
(PrintWriter pw,
int id,
String name
){
pw.
format(Locale.
ROOT,
" <Placemark>\n" +
" <name>%1$d</name>\n" +
" <styleUrl>#transWhitePoly</styleUrl>\n" +
" <description>\n" +
" <![CDATA[%2$s]]>\n" +
" </description>\n" +
" <Polygon>\n" +
" <outerBoundaryIs>\n" +
" <LinearRing>\n" +
" <coordinates>\n", id, name
);
}
private static void writeLineFooter
(PrintWriter pw
){
pw.
format(Locale.
ROOT,
" </coordinates>\n" +
" </LinearRing>\n" +
" </outerBoundaryIs>\n" +
" </Polygon>\n" +
" </Placemark>\n");
}
private static void writeKmlFooter
(PrintWriter pw
){
pw.
format("</Document>\n</kml>\n");
}
private static void writeCoordinates
(PrintWriter pw,
double x,
double y
){
pw.
format(Locale.
ROOT,
" %f,%f\n",x,y
);
}
/**
* Write a java area in kml format.
* @param filename
* @param name
* @param area
*/
public static void writeKml
(String filename,
String name, java.
awt.
geom.
Area area
){
String filePath = filename
;
if (filePath.
endsWith(".kml") ==
false)
filePath +=
".kml";
try (PrintWriter pw =
new PrintWriter(filePath
))
{
writeKmlHeader
(pw
);
int linePart =
0 ;
double startx =
0,starty =
0;
double[] res =
new double[6];
PathIterator pit = area.
getPathIterator(null);
int id =
0;
while (!pit.
isDone()) {
int type = pit.
currentSegment(res
);
double x = Utils.
toDegrees((int) res
[0]);
double y = Utils.
toDegrees((int) res
[1]);
switch (type
) {
case PathIterator.
SEG_MOVETO:
writeLineHeader
(pw, id++, name + linePart++
);
writeCoordinates
(pw, x,y
);
startx = x
;
starty = y
;
break;
case PathIterator.
SEG_LINETO:
writeCoordinates
(pw, x,y
);
break;
case PathIterator.
SEG_CLOSE:
writeCoordinates
(pw, startx,starty
);
writeLineFooter
(pw
);
break;
default:
// should not happen
System.
err.
println("Unsupported path iterator type " + type
+
". This is an internal splitter error.");
throw new IOException();
}
pit.
next();
}
writeKmlFooter
(pw
);
} catch (IOException e
) {
System.
err.
println("Could not write KML file " + filePath +
", processing continues");
}
}
/**
* Write out a KML file containing the areas that we calculated. This KML file
* can be opened in Google Earth etc to see the areas that were split.
*
* @param filename The KML filename to write to.
*/
public static void writeKml
(String filename,
List<Area> areas
) {
System.
out.
println("Writing KML file to " + filename
);
try (PrintWriter pw =
new PrintWriter(filename
);) {
writeKmlHeader
(pw
);
for (Area area : areas
) {
double south = Utils.
toDegrees(area.
getMinLat());
double west = Utils.
toDegrees(area.
getMinLong());
double north = Utils.
toDegrees(area.
getMaxLat());
double east = Utils.
toDegrees(area.
getMaxLong());
String name = area.
getName() ==
null ? String.
valueOf(area.
getMapId()) : area.
getName();
writeLineHeader
(pw, area.
getMapId(), name
);
writeCoordinates
(pw, west, south
);
writeCoordinates
(pw, west, north
);
writeCoordinates
(pw, east, north
);
writeCoordinates
(pw, east, south
);
writeCoordinates
(pw, west, south
);
writeLineFooter
(pw
);
}
writeKmlFooter
(pw
);
} catch (IOException e
) {
System.
err.
println("Could not write KML file " + filename +
", processing continues");
}
}
}