/*
* Copyright 2002-2012 Drew Noakes
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* More information about this project is available at:
*
* http://drewnoakes.com/code/exif/
* http://code.google.com/p/metadata-extractor/
*/
package com.drew.metadata;
import com.drew.imaging.ImageMetadataReader;
import com.drew.imaging.ImageProcessingException;
import com.drew.lang.GeoLocation;
import com.drew.metadata.exif.GpsDirectory;
import java.io.File;
import java.io.FileFilter;
import java.io.IOException;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.Collection;
/**
* A sample application that creates HTML that shows image positions on a Google Map according to the GPS data
* contained within each {@link GpsDirectory}, if available.
*/
public class GeoTagMapBuilder
{
public static void main(String args[]) throws ImageProcessingException, IOException
{
if (args.length != 1)
{
System.err.println("Expected a single argument of the path to the photographs to be processed.");
System.exit(1);
}
File path = new File(args[0]);
final String[] acceptedExtensions = new String[] { ".jpg", ".jpeg" };
// TODO recurse subdirectories?
final File[] files = path.listFiles(new FileFilter()
{
@Override
public boolean accept(final File file)
{
if (file.isDirectory())
return false;
for (String extension : acceptedExtensions) {
if (file.getName().toLowerCase().endsWith(extension))
return true;
}
return false;
}
});
Collection<PhotoLocation> photoLocations = new ArrayList<PhotoLocation>();
for (File file : files)
{
// Read all metadata from the image
Metadata metadata = ImageMetadataReader.readMetadata(file);
// See whether it has GPS data
GpsDirectory gpsDirectory = metadata.getDirectory(GpsDirectory.class);
if (gpsDirectory == null)
continue;
// Try to read out the location, making sure it's non-zero
GeoLocation geoLocation = gpsDirectory.getGeoLocation();
if (geoLocation == null || geoLocation.isZero())
continue;
// Add to our collection for use below
photoLocations.add(new PhotoLocation(geoLocation, file));
}
// Write output to the console.
// You can pipe this to a file if you like, or alternatively modify the output stream here
// to be a file or network stream.
PrintStream ps = new PrintStream(System.out);
writeHtml(ps, photoLocations);
// Make sure we flush the stream before exiting. If you use a different type of stream, you
// may need to close it here instead.
ps.flush();
}
/**
* Simple tuple type, which pairs an image file with its {@link GeoLocation}.
*/
public static class PhotoLocation
{
public final GeoLocation location;
public final File file;
public PhotoLocation(final GeoLocation location, final File file)
{
this.location = location;
this.file = file;
}
}
private static void writeHtml(PrintStream ps, Iterable<PhotoLocation> photoLocations)
{
ps.println("<!DOCTYPE html>");
ps.println("<html>");
ps.println("<head>");
ps.println("<meta name=\"viewport\" content=\"initial-scale=1.0, user-scalable=no\" />");
ps.println("<meta http-equiv=\"content-type\" content=\"text/html; charset=UTF-8\"/>");
ps.println("<style>html,body{height:100%;margin:0;padding:0;}#map_canvas{height:100%;}</style>");
ps.println("<script type=\"text/javascript\" src=\"https://maps.googleapis.com/maps/api/js?sensor=false\"></script>");
ps.println("<script type=\"text/javascript\">");
ps.println("function initialise() {");
ps.println(" var options = { zoom:2, mapTypeId:google.maps.MapTypeId.ROADMAP, center:new google.maps.LatLng(0.0, 0.0)};");
ps.println(" var map = new google.maps.Map(document.getElementById('map_canvas'), options);");
ps.println(" var marker;");
for (PhotoLocation photoLocation : photoLocations)
{
final String fullPath = photoLocation.file.getAbsoluteFile().toString().trim().replace("\\", "\\\\");
ps.println(" marker = new google.maps.Marker({");
ps.println(" position:new google.maps.LatLng(" + photoLocation.location + "),");
ps.println(" map:map,");
ps.println(" title:\"" + fullPath + "\"});");
ps.println(" google.maps.event.addListener(marker, 'click', function() { document.location = \"" + fullPath + "\"; });");
}
ps.println("}");
ps.println("</script>");
ps.println("</head>");
ps.println("<body onload=\"initialise()\">");
ps.println("<div id=\"map_canvas\"></div>");
ps.println("</body>");
ps.println("</html>");
}
}