Increasing scale of plotted GPS points

rumlac

Hello,

I have plotted the GPS coordinates of the 21 stages of the Tour De France, this is the first time i've done anything like this and I am struggling to understand how I can 'enlarge' the cluster of lines plotted. The current output looks like this:

and the code is:

import processing.pdf.*;
import tomc.gpx.*;
GPX gpx;

String numbers[] = {
  "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21"
};

float x;
float y;

String stageName;

void setup() {
  size(3508, 2480, PDF, "tdfMountains.pdf");
  background(30, 39, 40);
  noLoop();
}

void draw() {
  translate(width/2, height/2);
  rotate(radians(270));
  plotPoints();
  exit();
}


void plotPoints() {

  for (int q = 0; q<= 20; q++) {



    gpx = new GPX(this);
    gpx.parse("stage"+ numbers[q] +".gpx");


    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);

        for (int k = 0; k < trkseg.size(); k++) {


          GPXPoint pt = trkseg.getPoint(k);

          double correctedLat = pt.lat;
          double correctedLon = pt.lon; 


          x = new Float(correctedLat * (width/180));
          y = new Float(correctedLon * (height/180) );

          println("y= "+y);
          stroke(255);
          strokeWeight(0.7);
          point(x, y);
        }
      }
      fill(255, 50, 2, 140);
      text("Stage " + stageName, x, y);
    }
  }
}

Thanks!

quark

I suggest that you use the map function

e.g.

x = map(x, minX, maxX, 0, width);
y = map(y, minY, maxY, 0, height);

Where minX, maxX, minY and maxY are the limits for your GPS data. You will need to tweak these values to get exactly what you need.