Fix bouncing

mix.exs

@@ -3,7 +3,7 @@ defmodule Grains.Mixfile do
 
   def project do
     [app: :grains,
-     version: "0.0.69",
+     version: "0.0.70",
      elixir: "~> 1.2",
      elixirc_paths: elixirc_paths(Mix.env),
      compilers: [:phoenix, :gettext] ++ Mix.compilers,

web/static/js/presencesketch.js

@@ -111,10 +111,10 @@ Boid.prototype.render = function() {
 
 // Wraparound
 Boid.prototype.borders = function() {
-  if (this.position.x < -this.radius) this.velocity.x = -this.velocity.x;
-  if (this.position.y < -this.radius) this.velocity.y = -this.velocity.y;
-  if (this.position.x > PresenceSketch.width + this.radius) this.velocity.x = -this.velocity.x;
-  if (this.position.y > PresenceSketch.height + this.radius) this.velocity.y = -this.velocity.y;
+  if (this.position.x < this.radius) this.velocity.x = -this.velocity.x;
+  if (this.position.y < this.radius) this.velocity.y = -this.velocity.y;
+  if (this.position.x > PresenceSketch.width - this.radius) this.velocity.x = -this.velocity.x;
+  if (this.position.y > PresenceSketch.height - this.radius) this.velocity.y = -this.velocity.y;
 };
 
 // Separation