Draw lines on boids that influence their master

mix.exs

@@ -3,7 +3,7 @@ defmodule Grains.Mixfile do
 
   def project do
     [app: :grains,
-     version: "0.0.70",
+     version: "0.0.71",
      elixir: "~> 1.2",
      elixirc_paths: elixirc_paths(Mix.env),
      compilers: [:phoenix, :gettext] ++ Mix.compilers,

web/static/js/presencesketch.js

@@ -279,10 +279,10 @@ Master.prototype.run = function(boids) {
   let list = _.filter(boids, function(boid) { return that.type == boid.type; });
 
 
-  this.flock(boids);
+  this.flock(list);
   this.update();
   this.borders();
-  this.render();
+  this.render(list);
   this.send_osc();
 
 }
@@ -326,7 +326,7 @@ Boid.prototype.fillColor = function() {
   return color;
 }
 
-Boid.prototype.render = function() {
+Boid.prototype.render = function(list) {
   this.p.fill(this.color);
   this.p.stroke(200);
 
@@ -348,8 +348,19 @@ Boid.prototype.render = function() {
   this.p.pop();
   this.adjust_radius();
 
+  // the master looks at his minions and draws lines
+  if (list) {
+    let neighbordist = 250;
+    _.each(list, function(boid) {
+      var d = p5.Vector.dist(that.position, boid.position);
+      if ((d > 0) && (d < neighbordist)) {
+        this.p.stroke(255);
+        this.p.line(this.position.x, this.position.y,
+                    boid.position.x, boid.position.y);
+      }
+    });
 
-}
+  }