import processing.core.PApplet;
import de.fhpotsdam.unfolding.UnfoldingMap;
import de.fhpotsdam.unfolding.utils.MapUtils;
import de.fhpotsdam.unfolding.providers.*;
import java.util.List;
import de.fhpotsdam.unfolding.data.Feature;
import de.fhpotsdam.unfolding.data.GeoJSONReader;
import java.util.HashMap;
import java.util.Map;
import de.fhpotsdam.unfolding.marker.Marker;
/**
* Visualizes life expectancy in different countries.
*
* It loads the country shapes from a GeoJSON file via a data reader, and loads the population density values from
* another CSV file (provided by the World Bank). The data value is encoded to transparency via a simplistic linear
* mapping.
*/
public class LifeExpectancy extends PApplet {
UnfoldingMap map;
Map<String, Float> lifeExpByCountry;
List<Feature> countries;
List<Marker> countryMarkers;
public void setup() {
size(800, 600, OPENGL);
map = new UnfoldingMap(this, 50, 50, 700, 500, new Google.GoogleMapProvider());
MapUtils.createDefaultEventDispatcher(this, map);
// Load lifeExpectancy data
lifeExpByCountry = loadLifeExpectancyFromCSV("LifeExpectancyWorldBankModule3.csv");
println("Loaded " + lifeExpByCountry.size() + " data entries");
// Load country polygons and adds them as markers
countries = GeoJSONReader.loadData(this, "countries.geo.json");
countryMarkers = MapUtils.createSimpleMarkers(countries);
map.addMarkers(countryMarkers);
// Country markers are shaded according to life expectancy (only once)
shadeCountries();
}
public void draw() {
// Draw map tiles and country markers
map.draw();
}
//Helper method to color each country based on life expectancy
//Red-orange indicates low (near 40)
//Blue indicates high (near 100)
private void shadeCountries() {
for (Marker marker : countryMarkers) {
// Find data for country of the current marker
String countryId = marker.getId();
if (lifeExpByCountry.containsKey(countryId)) {
float lifeExp = lifeExpByCountry.get(countryId);
// Encode value as brightness (values range: 40-90)
int colorLevel = (int) map(lifeExp, 40, 90, 10, 255);
marker.setColor(color(255-colorLevel, 100, colorLevel));
}
else {
marker.setColor(color(150,150,150));
}
}
}
//Helper method to load life expectancy data from file
private Map<String, Float> loadLifeExpectancyFromCSV(String fileName) {
Map<String, Float> lifeExpMap = new HashMap<String, Float>();
String[] rows = loadStrings(fileName);
for (String row : rows) {
// Reads country name and population density value from CSV row
// NOTE: Splitting on just a comma is not a great idea here, because
// the csv file might have commas in their entries, as this one does.
// We do a smarter thing in ParseFeed, but for simplicity,
// we just use a comma here, and ignore the fact that the first field is split.
String[] columns = row.split(",");
if (columns.length == 6 && !columns[5].equals("..")) {
lifeExpMap.put(columns[4], Float.parseFloat(columns[5]));
}
}
return lifeExpMap;
}
}
