Adding trees to random terrains in Enu 0.2

- layer(diameter = 10):
  for circleDiameter in 1..diameter:
    let stepCount = circleDiameter * 3

    left circleDiameter / 2

    stepCount.times:
      forward 1
      turn 360 / stepCount

    right circleDiameter / 2

- tree(height = 5, width = 3):  
  let
    defaultColor = color
    trunkHeight = height div 2
    crownHeight = height - trunkHeight
  
  up height - 1
  
  height.times(stepNum):
    if stepNum < crownHeight:
      color = green
      layer 1..width
    if stepNum == crownHeight - 1:
      color = black
    
    down 1
  
  color = defaultColor

- hill(diameter = 10, treeDensity = 3, treeMinHeight = 2, treeMaxHeight = 10, treeMinWidth = 2, treeMaxWidth = 10):
  var
    layerDiameter = diameter
    layerNum = 1

  down 1
  
  while layerDiameter > 0:
    up 1
    layer(layerDiameter)
    
    (layerDiameter div 5).times:
      if treeDensity in 10:
        turn(-180..180)
        forward layerDiameter / 2
        up 1
        tree(treeMinHeight..treeMaxHeight, treeMinWidth..treeMaxWidth)
        back layerDiameter / 2
        
    layerDiameter -= layerNum
    inc layerNum
  
  down(layerNum-2)

- randomTerrain(hillCount = 10, minHillDiameter = 5, maxHillDiameter = 60, minDistance = 30, maxDistance = 60, treeDensity = 5, treeMinHeight = 2, treeMaxHeight = 30, treeMinWidth = 5, treeMaxWidth = 10):

  hillCount.times(hillNum):
    down 1
    forward(minDistance..maxDistance)
    up 1

    hill(minHillDiameter..maxHillDiameter, treeDensity, treeMinHeight, treeMaxHeight, treeMinWidth, treeMaxWidth)
    turn(-180..180)
    

speed = 100

randomTerrain(30)