Vortexer

A sample ship packaged with BerryBots as sample/vortexer.lua. It's designed for Vortex, a single player arcade style game among the Sample Stages.

Vortexer's strategy mainly consists of firing thrusters away from the vortex at long distances and perpendicular to the vortex at closer distances. This is a good strategy to avoid dying, but no effort is made to navigate directly into the corner zones. It also does not use lasers or torpedos or do any precise prediction of where it will move.

Source code

-- A ship designed to play the sample.vortex stage. Tries to get as far away
-- from the center as possible until it starts getting sucked in, then fires its
-- thruster perpendicular to try and slingshot around the center.
--
-- Its strategy is focused only on surviving, not actually aiming at the target
-- zones.
 
ship = nil
world = nil
center = nil
 
function init(shipArg, worldArg)
  ship = shipArg
  world = worldArg
  center = {x = (world:width() / 2), y = (world:height() / 2)}
  ship:setName("Vortexer")
  ship:setShipColor(255, 0, 255)
  ship:setThrusterColor(255, 255, 255)
end
 
function square(x)
  return x * x
end
 
slingshotDirection =  1
hitWall = false
 
function run(enemyShips, sensors)
  local bearingToCenter =
      math.atan2(center.y - ship:y(), center.x - ship:x())
  local distanceToCenter =
      math.sqrt(square(center.x - ship:x()) + square(center.y - ship:y()))
  local stuckOnWall = false
 
  if (ship:hitWall()) then
    if (hitWall) then
      stuckOnWall = true
    end
    hitWall = true
  end
 
  if (stuckOnWall) then
    ship:fireThruster(math.random() * 2 * math.pi, 1)
  else
    if (math.cos(ship:heading() - bearingToCenter) < 0) then
      ship:fireThruster(bearingToCenter + math.pi, 1)
      slingshotDirection = slingshotDirection * -1
    else
      ship:fireThruster(bearingToCenter + (math.pi * slingshotDirection / 2), 1)
    end
  end
end