added basic tracker. It takes way too much time.

frontend/index.html

@@ -14,7 +14,7 @@
   <h1>Hello, world!</h1>
 
   <h3 id="first-ts"></h3>
-  <svg width="450" height="900" id="first" style="background-color: lightgray">
+  <svg width="900" height="450" id="first" style="background-color: lightgray">
   </svg>
 
   <br>

frontend/main.js

@@ -70,7 +70,7 @@ function generatePoints(points, frames){
     const lst = [];
     for(const point of points.points){
         if(frames.indexOf(point.frameIndex) !== -1){
-            lst.push(m("circle", {cx: point.x, cy: point.y, r: 3}));
+            lst.push(m("circle", {cx: point.y, cy: point.x, r: 3}));
         }
     }
     return m("g", lst);