traffic3.nlogo

; some of the codes inspired by https://netlogoweb.org/launch#https://netlogoweb.org/assets/modelslib/Sample%20Models/Social%20Science/Traffic%202%20Lanes.nlogo

globals [
  selected-car    ; the currently selected car
  lanes           ; a list of the y coordinates of different lanes
  number-of-lanes ; max num of total lanes
  lanes-to-east
  lanes-to-west
  cones-are-moving
]

breed [cones cone]
breed [cars car]

cars-own [
  speed         ; the current speed of the car
  top-speed     ; the maximum speed of the car (different for all cars)
  target-lane   ; the desired lane of the car
  patience      ; the driver's current level of patience
  obstacle   ; blocked by cone
]

to setup
  clear-all
  set number-of-lanes 4
  set cones-are-moving 0
  set-default-shape cars "car"
  draw-road
  draw-cones
  create-or-remove-cars-going-east
  create-or-remove-cars-going-west
  reset-ticks
end

to go
  ask cones [move-cones]
  ask cars [
    move-forward
  ]
  create-and-remove-cars
  ask cars with [ patience <= 0 ] [change-to-any-lane]
  ask cars with [ obstacle = 1 ] [change-to-right-lane]
  tick
end

; **************** road related codes *******************
to draw-road
  ask patches [
    ; the road is surrounded by green grass of varying shades
    set pcolor green - random-float 0.5
  ]
  set lanes n-values number-of-lanes [ n -> number-of-lanes - (n * 2) - 1 ]
  ask patches with [ abs pycor <= number-of-lanes ] [
    ; the road itself is varying shades of grey
    set pcolor grey - 2.5 + random-float 0.25
  ]
  let y (last lanes) - 1 ; start below the "lowest" lane
  while [ y <= first lanes + 1 ] [
    if not member? y lanes [
      ; draw lines on road patches that are not part of a lane
      ifelse abs y = number-of-lanes
        [ draw-line y yellow 0 ]  ; yellow for the sides of the road
        [ draw-line y white 0.6 ] ; dashed white between lanes
    ]
    set y y + 1 ; move up one patch
  ]
  create-turtles 1 [ ; temporary turtle to write label WEST and EAST
    setxy (min-pxcor + 1) 5
    set shape "square"
    set color green
    set label "WEST"
  ]
  create-turtles 1 [
    setxy (max-pxcor - 0.5) -5
    set shape "square"
    set color green
    set label "EAST"
  ]
end

to draw-line [ y line-color gap ]
  create-turtles 1 [ ; temporary turtle to draw line
    setxy (min-pxcor - 0.2) y
    hide-turtle
    set color line-color
    set heading 90

    repeat world-width [
      pen-up
      forward gap
      pen-down
      forward (1 - gap)
    ]
    die
  ]
end

; **************** CONES related codes *******************
to draw-cones
  let xpos min-pxcor
  repeat world-width [
    create-cones 1 [
      setxy xpos 0
      set size 0.7
      set color yellow
      set shape "triangle"
      set heading 180
      set xpos ( xpos + 1 )
    ]
  ]
end

to move-cones ; this is to move cone up or down the line
  let target-divider-line 0
  if (pos = 1) [
    set target-divider-line 2
  ]
  if (pos = 0) [
    set target-divider-line 0
  ]
  if (pos = -1) [
    set target-divider-line -2
  ]
  facexy xcor target-divider-line
  let ycor1 precision ycor 3 ; to avoid floating point errors
  ifelse ( ycor1 != target-divider-line) [
    set color yellow
    forward 0.0005
    set cones-are-moving 1
  ] [
    set color orange
    set cones-are-moving 0
  ]
end

; **************** cars related codes *******************
to create-and-remove-cars
  let cars-heading-east cars with [heading = 90]
  let cars-heading-west cars with [heading = 270]
  ;set
  if count cars-heading-east > cars-going-east [ ; remove excess car(s) heading east, if any
    let n count cars-heading-east - cars-going-east
    ask n-of n cars-heading-east [ die ]
  ]
  if count cars-heading-west > cars-going-west [ ; remove excess car(s) heading east, if any
    let n count cars-heading-west - cars-going-west
    ask n-of n  cars-heading-west [ die ]
  ]
  if count cars-heading-east < cars-going-east [ ; create one car heading east, if needed
    create-cars 1 [
      set shape one-of [ "car" "truck" ]
      ifelse (shape = "truck") [ set size 1 ] [ set size 0.9 ]
      setxy min-pxcor one-of [-1 -3]
      let this-car self
      set color car-color
      set heading 90
      set top-speed 0.005 + random-float 0.05
      set speed 0.05 + random-float 0.01
      set patience random max-patience
    ]
  ]
  if count cars-heading-west < cars-going-west [ ; create one car heading west, if needed
    create-cars 1 [
      set shape one-of [ "car-l" "truck-l" ]
      ifelse (shape = "truck") [ set size 1 ] [ set size 0.9 ]
      setxy max-pxcor one-of [1 3]
      set color car-color
      set heading 270
      set top-speed 0.005 + random-float 0.05
      set speed 0.05 + random-float 0.01
      set patience random max-patience
    ]
  ]
end

to create-or-remove-cars-going-east
  ; create cars
  let road-patches-east patches with [ member? pycor [-1 -3] ]
  if cars-going-east > count road-patches-east [
    set cars-going-east count road-patches-east - 10
  ]
  create-cars (cars-going-east - count cars with [ heading = 90 ]) [
    set shape one-of [ "car" "truck" ]
    ifelse (shape = "truck") [ set size 1 ] [ set size 0.9 ]
    set color car-color
    move-to one-of free road-patches-east
    set target-lane pycor
    set heading 90
    set top-speed 0.005 + random-float 0.05
      set speed 0.05 + random-float 0.01
    set patience random max-patience
  ]
end

to create-or-remove-cars-going-west
  ; create cars
  let road-patches-west patches with [ member? pycor [1 3] ]
  if cars-going-west > count road-patches-west [
    set cars-going-west count road-patches-west
  ]
  create-cars (cars-going-west - count cars with [ heading = 270 ]) [
    set shape one-of [ "car-l" "truck-l" ]
    ifelse (shape = "truck-l") [ set size 1 ] [ set size 0.9 ]
    set heading -90
    set color car-color
    move-to one-of free road-patches-west
    set target-lane pycor
    set top-speed 0.005 + random-float 0.05
      set speed 0.05 + random-float 0.01
    set patience random max-patience
  ]
end


to-report free [ road-patches ] ; turtle procedure
  let this-car self
  report road-patches with [
    not any? turtles-here with [ self != this-car ]
  ]
end

to move-forward
  ; check if there's any blocking car in front
  ; if so, slow-down, match the speed to the car in front

  ; check if there's any approaching obstacle (cones) in right front within 1 patch distance and angle 45 degree
  ; (use patch-right-and-ahead)
  ; if so, set obstacle = 1
  if (xcor > max-pxcor) or (xcor < min-pxcor) [ die ] ; disapear at the end of screen
  ; check for other car
  let blocking-cars other cars in-cone (1 + speed) 180 with [ y-distance <= 2 ]
  let blocking-car min-one-of blocking-cars [ distance myself ]
  if blocking-car != nobody [
    ; match the speed of the car ahead of you and then slow
    ; down so you are driving a bit slower than that car.
    set speed [ speed ] of blocking-car
    ;slow-down
  ]
  forward speed
end

to change-to-any-lane
  ; make the car to change to any lane (right or left)
  ; reset the patience to max-patience after changing lane and speed up
  ; see original example
end

to change-to-right-lane
  ; make the car to change to left lane only when there's approaching obstacle/cone from the right side
  ; reset the patience to max-patience after changing lane and speed up
  ; see the original example
end

to slow-down
  let car-ahead one-of turtles-on patch-ahead 1
  set speed [ speed ] of car-ahead - deceleration
  ; brake / reduce speed based on deceleration variable
  ; reduce patience by 1 everytime hit brake
end

to speed-up
  ; add speed based on acceleration variable
end

to-report car-color
  ; give all cars a blueish color, but still make them distinguishable
  report one-of [ blue cyan sky yellow] + 1.5 + random-float 1.0
end

to west-plus
  if cars-going-west < 50 [
    set cars-going-west cars-going-west + 1
  ]
end

to west-minus
  if cars-going-west > 0 [
    set cars-going-west cars-going-west - 1
  ]
end

to east-plus
  if cars-going-east < 50 [
    set cars-going-east cars-going-east + 1
  ]
end

to east-minus
  if cars-going-east > 0 [
    set cars-going-east cars-going-east - 1
  ]
end

to-report x-distance
  report distancexy [ xcor ] of myself ycor
end

to-report y-distance
  report distancexy xcor [ ycor ] of myself
end

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@#$#@#$#@
## WHAT IS IT?

(a general understanding of what the model is trying to show or explain)

## HOW IT WORKS

(what rules the agents use to create the overall behavior of the model)

## HOW TO USE IT

(how to use the model, including a description of each of the items in the Interface tab)

## THINGS TO NOTICE

(suggested things for the user to notice while running the model)

## THINGS TO TRY

(suggested things for the user to try to do (move sliders, switches, etc.) with the model)

## EXTENDING THE MODEL

(suggested things to add or change in the Code tab to make the model more complicated, detailed, accurate, etc.)

## NETLOGO FEATURES

(interesting or unusual features of NetLogo that the model uses, particularly in the Code tab; or where workarounds were needed for missing features)

## RELATED MODELS

(models in the NetLogo Models Library and elsewhere which are of related interest)

## CREDITS AND REFERENCES

(a reference to the model's URL on the web if it has one, as well as any other necessary credits, citations, and links)
@#$#@#$#@
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