Rainbow Snake.nlogo

globals [ score can-turn food-x food-y wall-rot ]
patches-own [ is-wall? is-extra-food? patch-life ]


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; GETTING PATCH INFORMATION ;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

; Get the life left in a patch
to-report get-patch-life
  set patch-life (max (list 0 patch-life))
  report patch-life
end

; Check if the patch contains food
to-report is-food
  report (distancexy food-x food-y < 1)
end

; Check if patch is an extra peice of food or not
to-report is-extra-food
  report is-extra-food? = true
end

; Check if the patch is alive or dead
to-report is-alive
  report get-patch-life > 0
end

; Check if coordinate is empty
to-report is-free-spot [ x y ]
  let result (true)
  ask patch x y [
    set result (
      true
      and (not is-wall?)
      and (not is-alive)
      and (not is-food)
    )
  ]

  report result
end

; Get the angle of the patch
to-report get-patch-angle
  report atan (pxcor + 0.5) (pycor + 0.5)
end

; Turn the angle into a color of the rainbow
to-report get-angle-color[ ang brightness ]
  let scaler brightness * 128
  if scaler > 127 [ set scaler 127 ]
  if scaler < 000 [ set scaler 000 ]

  report (list
    (sin (ang + 000) * scaler + scaler)
    (sin (ang + 120) * scaler + scaler)
    (sin (ang + 240) * scaler + scaler)
  )
end

; Get the color that a patch should update to
to-report get-patch-color
  if is-wall?  [
    if is-food [ report get-angle-color (000 + get-patch-angle) (0.5) ]
    report get-angle-color (000 + get-patch-angle) (1.0)
  ]

  if is-food  [ report get-angle-color (180 + get-patch-angle) (1.0) ]

  if is-alive [
    let brightness 0.65 + 0.35 * ((get-patch-life + 1) / score)
    report get-angle-color (270 + get-patch-angle) (brightness)
  ]

  if is-extra-food [
    report get-angle-color (300 + get-patch-angle) (0.8)
  ]

  report get-angle-color (090 + get-patch-angle) (0.2)
end


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; UPDATING PARTS OF THE GAME ;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;;; WALLS ;;;
to update-walls
  ; Loops based on the amount of spinners
  let wall-mod (360 / spinners)
  set wall-rot ((wall-rot + spinner-speed) mod wall-mod)

  ask patches [
    ; Get the distance of outer edge
    let wall ((max-pxcor + max-pycor) / 2)
    let dist (max (list (abs pxcor) (abs pycor)))

    if circular [ set dist distancexy 0 0 ]

    ; Draw outer circle
    set is-wall? (dist >= wall)

    ; Make inner circle
    if ((abs (dist - wall / 1.75)) < 1)
    [
      let ang (get-patch-angle mod wall-mod)
      if (ang < wall-rot) [ set ang (ang + wall-mod) ]
      if ((ang - wall-rot) < (spinner-size * wall-mod)) [ set is-wall? true ]
    ]
  ]
end

;;; FOOD ;;;
to move-food
  let new-food-x (random-pxcor)
  let new-food-y (random-pycor)

  ; While food is not a valid spot, move the food
  while [ not (is-free-spot new-food-x new-food-y) ]
  [
    set new-food-x (random-pxcor)
    set new-food-y (random-pycor)
  ]

  ; Move food once good spot has been found
  set food-x new-food-x
  set food-y new-food-y
end

to make-food-walk
  if ((random food-weight) = 0) [
    let new-food-x (food-x)
    let new-food-y (food-y)
    let change (((random 2) * 2) - 1)

    ifelse (random 2 = 0)
    [ set new-food-x (new-food-x - change) ]
    [ set new-food-y (new-food-y - change) ]

    if (is-free-spot new-food-x new-food-y) [
      set food-x (new-food-x)
      set food-y (new-food-y)
    ]
  ]
end

;;; PATCHES / SNAKE TAIL / COLORS ;;;
to age-patches [ time ]
  ask patches with [ get-patch-life > 0 ]
  [ set patch-life (get-patch-life - time) ]
end

to update-patches
  age-patches 1
  ask patches [ set pcolor (get-patch-color) ]
end

;;; TURTLES / SNAKE ;;;
to add-to-score [ delta ]
  set score (score + delta)
  ask patches with [ is-alive ]
  [ set patch-life (get-patch-life + delta) ]
end

to check-tail
  ; Get the oldest square hit by wall
  let min-life 0
  ask patches with [ is-wall? ] [
    if get-patch-life > min-life [ set min-life get-patch-life ]
  ]

  ; If tail hits moving wall, cut off rest of tail
  ask patches with [ get-patch-life <= min-life ] [
    if is-alive [ set is-extra-food? (not is-wall?) ]
    set patch-life (0)
  ]

  add-to-score 0 - min-life
end

to update-turtles
  let reset false

  ask turtles [
    fd 1

    if (is-food) [
      add-to-score 3
      move-food
    ]

    if is-extra-food [
      add-to-score 1
      set is-extra-food? false
    ]

    set reset (not is-free-spot pxcor pycor)

    check-tail
    set patch-life (score)
  ]

  ; If we could not take the spot than reset / die
  if reset [ setup ]
end


;;;;;;;;;;;;;;;;;;;
;;; UPDATE GAME ;;;
;;;;;;;;;;;;;;;;;;;

to go
  ; Update Game
  make-food-walk
  update-turtles
  update-walls
  update-patches
  display

  ; Plot the current score
  plot score

  ; Wait
  if speed < 10 [ wait 0.5 / speed ]

  ; Let the player move
  set can-turn true
end

;;;;;;;;;;;;;;;;
;;; CONTROLS ;;;

to make-turn [ angle ]
  if not can-turn [ go ]

  ask turtles with [ heading != (180 + angle) mod 360 ]
  [ set heading angle ]
  set can-turn false
end

to go-up
  make-turn 0
end

to go-down
  make-turn 180
end

to go-left
  make-turn 270
end

to go-right
  make-turn 90
end

;;;;;;;;;;;;;;;;;;
;;; SETUP GAME ;;;

to setup-turtle
  ca
  cro 1 [
    set heading 0
    set color red
    set hidden? true
  ]

  set score 10
  set can-turn true
end

to setup
  ask patches [ set is-extra-food? false ]
  setup-turtle
  set wall-rot 0
  update-walls
  move-food
  go
end
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@#$#@#$#@
## WHAT IS IT?

This is a game of snake that is built using design philosophies from a C programmer

## HOW IT WORKS

This is a basic game of snake, in the case that you have lived in fear under a rock, read [this wikipedia page](https://en.wikipedia.org/wiki/Snake)

In this game, there are moving walls, and if your snake gets hit by a moving wall, the younger parts of the snake will wall off and you will have to collect them back.

## HOW TO USE IT

Press the setup button to reset / start the game, then press the go button to make the game run.

Use WSAD to move the snake up, down, left, right, respectivly.

You can change the speed of the game with the speed slider.

You can also change the size of the spinning things in the center and how fast they go.

You may also change the amount of spinners there are in the center.

There is a switch to make the game more circular than rectangular, but this also makes it much harder to play.

## THINGS TO TRY

Try changing the `food-weight` value. If the value is smaller, than the food weighs less and will be blown around by the wind more. The higher the `food-weight` the less the food will move around 

Try changing the resolution as all of the game code is resolution independent.
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@#$#@#$#@
NetLogo 6.0.1
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