highwaytraffix.nlogo

globals [
  selected-car   ; the currently selected car
  lanes          ; a list of the y coordinates of different lanes
]
breed [trucks truck]

turtles-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
]

to setup
  clear-all
  set-default-shape turtles "car"
  draw-road
  create-or-remove-cars
  set selected-car one-of turtles
  ask selected-car [ set color car-color ]
  reset-ticks
end

to create-or-remove-cars

  ; make sure we don't have too many cars for the room we have on the road
  let road-patches patches with [ member? pycor lanes ]
  if number-of-cars > count road-patches [
    set number-of-cars count road-patches
  ]

  create-turtles (number-of-cars - count turtles ) [
    set color car-color
    move-to one-of free road-patches
    set target-lane pycor
   ; if target-lane = -4 [set target-lane -2]
    set heading 90
    set top-speed 0.5 + random-float 0.5
    set speed 0.5
    set patience random max-patience
  ]
  create-trucks (number-of-trucks - count trucks) [
    set color red
    set shape "truck2"
    set size 2
    move-to one-of free road-patches
   ; move-to one-of free road-patches with [(pycor = -4) or (pycor = -2)]
    set target-lane pycor
    set heading 90
    set top-speed 0.5 + random-float 0.5
    set speed 0.5
    set patience random max-patience

  ]
  ask turtles with [xcor > 18] [die]
  ;if count turtles > number-of-cars [
  ;  let n count turtles - number-of-cars
  ;  ask n-of n turtles [ die ]
  ;]

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 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
  ]
  draw-road-lines
end

to draw-road-lines
  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 0.5 ] ; dashed white between lanes
    ]
    set y y + 1 ; move up one patch
  ]
end

to draw-line [ y line-color gap ]
  ; We use a temporary turtle to draw the line:
  ; - with a gap of zero, we get a continuous line;
  ; - with a gap greater than zero, we get a dasshed line.
  create-turtles 1 [
    setxy (min-pxcor - 0.5) y
    hide-turtle
    set color line-color
    set heading 90
    repeat world-width [
      pen-up
      forward gap
      pen-down
      forward (1 - gap)
    ]
    die
  ]
end

to go
  create-or-remove-cars

  ask turtles [ move-forward ]
  ask turtles with [ patience <= 0 ] [ choose-new-lane ]
  ask turtles with [ ycor != target-lane and breed != "truck"] [ move-to-target-lane ]
  ;ask trucks with [ any? trucks-at 1 0 ] [
  ;set speed [speed] of trucks-at 1 0
  ;set patience 300
  ;set color green
  ; ask trucks-at 1 0 [set color green
  ;set patience 300]
  ;]
  tick
end

to move-forward ; turtle procedure
  set heading 90
  speed-up-car ; we tentatively speed up, but might have to slow down
  let blocking-cars other turtles in-cone (1 + speed) 180 with [ y-distance <= 1 ]
  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-car
  ]
  forward speed
end

to slow-down-car ; turtle procedure
  set speed (speed - deceleration)
  if speed < 0 [ set speed deceleration ]
  ; every time you hit the brakes, you loose a little patience
  set patience patience - 1
end

to speed-up-car ; turtle procedure
  set speed (speed + acceleration)
  if speed > top-speed [ set speed top-speed ]
end

to choose-new-lane ; turtle procedure
  ; Choose a new lane among those with the minimum
  ; distance to your current lane (i.e., your ycor).
  let other-lanes remove ycor lanes
  if not empty? other-lanes [
    let min-dist min map [ y -> abs (y - ycor) ] other-lanes
    let closest-lanes filter [ y -> abs (y - ycor) = min-dist ] other-lanes
    set target-lane one-of closest-lanes
    set patience max-patience
  ]
end

to move-to-target-lane ; turtle procedure
  set heading ifelse-value (target-lane < ycor) [ 180 ] [ 0 ]
  let blocking-cars other turtles in-cone (1 + abs (ycor - target-lane)) 180 with [ x-distance <= 1 ]
  let blocking-car min-one-of blocking-cars [ distance myself ]
  ifelse blocking-car = nobody [
    forward 0.2
    set ycor precision ycor 1 ; to avoid floating point errors
  ] [
    ; slow down if the car blocking us is behind, otherwise speed up
    ifelse towards blocking-car <= 180 [ slow-down-car ] [ speed-up-car ]
  ]
end

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

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

to select-car
  ; allow the user to select a different car by clicking on it with the mouse
  if mouse-down? [
    let mx mouse-xcor
    let my mouse-ycor
    if any? turtles-on patch mx my [
      ask selected-car [ set color car-color ]
      set selected-car one-of turtles-on patch mx my
      ask selected-car [ set color red ]
      display
    ]
  ]
end

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