1 files changed, 92 insertions, 0 deletions
diff --git a/gpsviewer.pde b/gpsviewer.pde
new file mode 100644
index 0000000..da614b2
--- /dev/null
+++ b/gpsviewer.pde
@@ -0,0 +1,92 @@
+XMLElement kml;
+ArrayList points = new ArrayList();
+
+class p3d {
+  float x,y,z;
+  p3d(float _x,float _y,float _z) {
+    x=_x;
+    y=_y;
+    z=_z;
+  }
+}
+
+p3d max=new p3d(-1000,-1000,-1000);
+p3d min=new p3d(1000,1000,1000);
+
+float xo,yo,sc;
+
+void addPoint(String[] coord) {
+  p3d p;
+  if (coord.length>2) {
+    p=new p3d(float(coord[0]),float(coord[1]),float(coord[2]));
+  }      
+  else p=new p3d(float(coord[0]),float(coord[1]),0.0);
+  points.add(p);
+  if (p.x>max.x) max.x=p.x;
+  if (p.y>max.y) max.y=p.y;
+  if (p.z>max.z) max.z=p.z;
+  if (p.x<min.x) min.x=p.x;
+  if (p.y<min.y) min.y=p.y;
+  if (p.z<min.z) min.z=p.z;
+}
+
+void setup() {
+  size(200, 200);
+  kml = new XMLElement(this, "tim-openpaths.kml").getChild("Document");
+  //kml = new XMLElement(this, "everytrip-demo.kml").getChild("Document");
+  int num = kml.getChildCount();
+  for (int i = 0; i < num; i++) {
+    if (kml.getChild(i).getName().equals("Placemark")) {
+      if (kml.getChild(i).getChildren("Point").length>0) { //element contains a single coordinate
+        addPoint(kml.getChild(i).getChild("Point").getChild("coordinates").getContent().split(","));
+      }
+      if (kml.getChild(i).getChildren("coordinates").length>0) { //element contains a table of coordinates
+        String[] coords=kml.getChild(i).getChild("coordinates").getContent().split("\\n");
+        for (int j=0;j<coords.length;j++) {
+          addPoint(coords[j].split(","));
+        }
+      }
+    }
+  }
+  println ("found "+str(points.size())+" data points");
+  
+  //work out offsets
+  if (max.x-min.x>max.y-min.y) {
+    //scale to X
+    xo=0;
+    yo=(height/2)-((height*((max.y-min.y)/(max.x-min.x))*0.5));
+    println("ratio: "+str((max.y-min.y)/(max.x-min.x)));
+  }
+  else {
+    //scale to Y
+    xo=(width/2)-((width*((max.x-min.x)/(max.y-min.y))*0.5));
+    println("ratio: "+str((max.x-min.x)/(max.y-min.y)));
+    yo=0;
+  }
+  
+  size(512,512);
+  background(0);
+  stroke(255);
+}
+
+void draw() {
+  println(str(min.x)+","+str(min.y)+" to "+str(max.x)+","+str(max.y));
+  println("offset: "+str(xo)+","+str(yo));
+  sc=max(max.x-min.x,max.y-min.y); 
+  if (sc==0.0) println("no movement!");
+  else {
+    float psc; //pixels per degree
+    if (max.x-min.x>max.y-min.y) psc=width/sc; //maximum span of latitude/longitude
+    else psc=height/sc;
+    //println("scale: "+str(sc)+" :"+str(width/sc)+" pixels/degree"); 
+    for (int i=0;i<points.size()-1;i++) {
+      float x1=((((p3d)points.get(i)).x-min.x)*psc)+xo;
+      float y1=((((p3d)points.get(i)).y-min.y)*psc)+yo;
+      float x2=((((p3d)points.get(i+1)).x-min.x)*psc)+xo;
+      float y2=((((p3d)points.get(i+1)).y-min.y)*psc)+yo;
+      //println(str(x1)+","+str(y1)+" to "+str(x2)+","+str(y2));
+      line(x1,y1,x2,y2);
+    }
+  }
+  noLoop();
+}