lobo/lobo.nlogo

;; lobo: Logo Bolo
;; (c) Ben Kurtovic, 2011
;;
;; Logo Bolo is a rewrite of the classic tank game by Stuart Cheshire in NetLogo.
;;

;; ============
;; Declarations
;; ============

globals [
  bullet-speed
  bullet-travel-distance
  friction
  last-tick-time
  max-acceleration
  max-fps
  max-tank-speed
  min-acceleration
  player
  speed-up
  turn-speed
]

breed [bullets bullet]
breed [crosshairs crosshair]
breed [tanks tank]

bullets-own [
  travel-distance
]

tanks-own [
  acceleration
  speed
  team
]

;; ===========================
;; Button-initiated procedures
;; ===========================

to setup
  clear-all
  no-display
  setup-defaults
  ask patches [
    set pcolor random 3
  ]
  spawn-player
  display
  no-display
  set last-tick-time timer
end

to go
  do-tank-physics
  do-bullet-physics
  render
  keep-time
end

to player-accelerate
  ask player [
    if acceleration < 0 [
      set acceleration 0
    ]
    set acceleration acceleration + speed-up
    if acceleration > max-acceleration [
      set acceleration max-acceleration
    ]
  ]
end

to player-decelerate
  ask player [
    set acceleration min-acceleration
  ]
end

to player-turn-left
  ask player [
    lt turn-speed
  ]
end

to player-turn-right
  ask player [
    rt turn-speed
  ]
end

to player-fire
  ask player [
    fire
  ]
end

;; ================
;; Other procedures
;; ================

to setup-defaults
  set bullet-speed 2
  set bullet-travel-distance 16
  set friction 0.01
  set max-acceleration 0.5
  set max-fps 30
  set max-tank-speed 0.3
  set min-acceleration -0.025
  set speed-up 0.1
  set turn-speed 24
end

to spawn-player
  create-ordered-tanks 1 [
    set player (tank who)
    set color (get-tank-color "player")
    set size 2
    set speed 0
    set team 0
  ]
end

to fire
  hatch-bullets 1 [
    set color white
    set size 1
    set travel-distance 0
  ]
end

to do-tank-physics
  ask tanks [
    set speed speed + acceleration
    if speed > max-tank-speed [
      set speed max-tank-speed
    ]
    if speed < 0 [
      set speed 0
    ]
    set acceleration acceleration - friction
    if acceleration < min-acceleration [
      set acceleration min-acceleration
    ]
    fd speed
  ]
end

to do-bullet-physics
  ask bullets [
    fd bullet-speed
    set travel-distance travel-distance + bullet-speed
    if travel-distance >= bullet-travel-distance [
      die 
    ]
  ]
end

to render
  display
  no-display
end

to keep-time
  let time-since-last-tick timer - last-tick-time
  let wait-time (1 / max-fps) - time-since-last-tick
  wait wait-time
  tick
  set last-tick-time timer
end

;; =================
;; Monitor reporters
;; =================

to-report player-speed
  report [speed] of player
end

;; ===============
;; Other reporters
;; ===============

to-report get-tank-color [affiliation]
  if affiliation = "player" [ report gray ]
  if affiliation = "enemy"  [ report red ]
  if affiliation = "ally"   [ report green ]
  report black
end
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WHAT IS IT?
-----------
This section could give a general understanding of what the model is trying to show or explain.


HOW IT WORKS
------------
This section could explain what rules the agents use to create the overall behavior of the model.


HOW TO USE IT
-------------
This section could explain how to use the model, including a description of each of the items in the interface tab.


THINGS TO NOTICE
----------------
This section could give some ideas of things for the user to notice while running the model.


THINGS TO TRY
-------------
This section could give some ideas of things for the user to try to do (move sliders, switches, etc.) with the model.


EXTENDING THE MODEL
-------------------
This section could give some ideas of things to add or change in the procedures tab to make the model more complicated, detailed, accurate, etc.


NETLOGO FEATURES
----------------
This section could point out any especially interesting or unusual features of NetLogo that the model makes use of, particularly in the Procedures tab.  It might also point out places where workarounds were needed because of missing features.


RELATED MODELS
--------------
This section could give the names of models in the NetLogo Models Library or elsewhere which are of related interest.


CREDITS AND REFERENCES
----------------------
This section could contain a reference to the model's URL on the web if it has one, as well as any other necessary credits or references.
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