clarify cardinal prop in tron and always move forward initially

subjects/tron/ai/random.js

@@ -26,12 +26,9 @@ const update = state => {
   //   color: A number that represent the color of a AI
   //   name: A string of the AI name
   //   score: A number of the total block collected by this AI
-  //   x: The horizontal position of the AI
-  //   y: The vertical position of the AI
-  //   index: The computed index of the coord (x * 100 + y)
   //   coords: An array of 4 coordinates of the nearest blocks
 
-  // Each coordinate contains:
+  // Each coordinate (and AI) contains:
   //   x: The horizontal position
   //   y: The vertical position
   //   index: The computed index of the coord (x * 100 + y)
@@ -44,6 +41,9 @@ const update = state => {
   //   direction: A number between 0 and 3 that represent the direction
   //     [ 0: FORWARD, 1: RIGHT, 2: BACKWARD, 3: LEFT ]
 
+  // note that AIs initial cardinal is random (depending on the seed)
+  // your AI cardinal is the way you are facing
+
   // Saving state between each updates:
   // I update the MAP with the new position of each AIs
   state.ais.forEach(addToMap)

subjects/tron/lib/state.js

@@ -87,7 +87,7 @@ addEventListener('message', self.init = initEvent => {
     const ais = JSON.parse(data)
     me || (ais
       .sort((a, b) => a.name - b.name)
-      .forEach(a => prev[a.name] = [{...a, cardinal: r4(), direction: r4() }]))
+      .forEach(a => prev[a.name] = [{...a, cardinal: r4(), direction: 0 }]))
 
     for (const ai of ais) {
       const { x, y, name, dead } = ai