import tomc.gpx.*;
import com.processinghacks.arcball.*;

GPX gpx;
ArcBall arcball;

void setup() {

  size(600,400,P3D);

  arcball = new ArcBall(this);
  gpx = new GPX(this);

  gpx.parse("newzealand_fucked.gpx");

}

void draw() {

  background(255);
  lights();
  rectMode(CENTER);
  ellipseMode(CENTER);

  translate(width/2,height/2,-height/2);
  fill(230);
  noStroke();
  sphere(0.9999*height/2);

  noFill();
  stroke(0);
  for (int i = 0; i < gpx.getTrackCount(); i++) {
    GPXTrack trk = gpx.getTrack(i);
    for (int j = 0; j < trk.size(); j++) {
      GPXTrackSeg trkseg = trk.getTrackSeg(j);
      beginShape(LINE_STRIP);
      for (int k = 0; k < trkseg.size(); k++) {
        GPXPoint pt = trkseg.getPoint(k);
        double r = height/2 * (pt.ele + 6367.47000) / 6367.47000;
        double x = r * Math.sin(pt.lat) * Math.cos(pt.lon);
        double y = r * Math.sin(pt.lat) * Math.sin(pt.lon);
        double z = r * Math.cos(pt.lat);
        vertex(x,y,z);
      }
      endShape();
    }
  }

}

//
// convenience method which casts doubles to floats
// because the GPX functions use doubles...
// 

void vertex(double x, double y, double z) {
  vertex((float)x,(float)y,(float)z); 
}