gradient.bzz (Source) 

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function init() {
  iteration = 0
  if(id == 0) {
    # Source robot
    mydist = 0.
  }
  else {
    # Other robots
    mydist = 1000.
    # Listen to other robots' distances
    neighbors.listen("dist_to_source",
      function(value_id, value, robot_id) {
        mydist = math.min(
          mydist,
          neighbors.get(robot_id).distance + value)
      })
  }
}

function step() {
  debug(mydist)
  # Added color gradient from red (closest) to blue (furthest)
  if(mydist < 100) {
    setleds(255,0,0)
  }
  else if (mydist >= 100 and mydist < 200) {
    setleds(255,102,0)
  }
  else if (mydist >= 200 and mydist < 300) {
    setleds(255,204,0)
  }
    else if (mydist >= 300 and mydist < 400) {
    setleds(204,255,0)
  }
    else if (mydist >= 400 and mydist < 500) {
    setleds(101,255,0)
  }
    else if (mydist >= 500 and mydist < 600) {
    setleds(0,255,0)
  }
    else if (mydist >= 600 and mydist < 700) {
    setleds(0,255,101)
  }
    else if (mydist >= 700 and mydist < 800) {
    setleds(0,255,203)
  }
    else if (mydist >= 800 and mydist < 900) {
    setleds(0,203,255)
  }
    else if (mydist >= 900 and mydist < 1000) {
    setleds(0,101,255)
  } 
    else  {
    setleds(0,0,255)
  }

  # Set message to be passed every 3s
  if(iteration % 30 == 0) {
    neighbors.broadcast("dist_to_source", mydist)
  }
  iteration = iteration + 1
}

function destroy() {
}