 
       for agent in agents
         ctx.fillStyle = agent.color()
-        ctx.font = "#{Math.floor(fontSizeScale(agent.dir.lengthSq()))}px Arial"
+        ctx.font = "#{Math.floor(agent.mod*fontSizeScale(agent.dir.lengthSq()))}px Arial"
         ctx.fillText(agent.str, agent.pos.x, agent.pos.y)
 
     setInterval(->

          g: g
          b: b
          a: 1
          color: -> "rgba(#{@r}, #{@g}, #{@b}, #{@a})"
      # move angents
      for agent, i in agents
        agent.a = _.min([i*10/agents.length,1,(i-agents.length)*10/-agents.length]) # close to 0 and close to agents.length should fade to 0
        agent.dir = agent.dir.mix(force(agent.pos.x, agent.pos.y), 0.1)
        agent.pos = agent.pos.add(agent.dir)
      # remove agents


    # set up agents
    agents = []
    maxAgents = 1200
    numAdd = 10
    update = ->
      # new agents
      for i in [1..numAdd]
