CODEWITHSUNDEEP
netlogo
bigbiodata
bigbiodata

Reputation: 103

Is it possible to create turtles of square shape proportional to x% of world surface area or size in Netlogo?

I wanted to initialise my world with turtles that would theoretically occupy x% of the total surface area or the size of the world. How do I know what is the exact size of each turtle? I know the world size can be calculated by:

world-width
world-height

My turtles are triangular in size and currently a size 4 and as per patch size 5 and dimensions of the world set to -80 80 -80 80, this size is perfect and I would like to keep it at size 4.

How do I calculate what number of turtles would occupy 1%, 5%, 10%, 20% and 40% of the entire surface area?

Upvotes: 1

Views: 74

Answers (1)

Jasper
Jasper

Reputation: 2780

You are on the right track with world-width and world-size. Those give you the size of the world, based on the number of patches.

If you want to make a turtle to have half the surface area, you just need to update it's size variable, which is also measured in patches. So a turtle with size of 1 is exactly as tall and wide as a single patch.

to make-half-size-square
  clear-all
  ; assumes we want a square shape, just use `sqrt` on the total world surface area
  let half-surface-size sqrt (world-width * world-height / 2)
  show half-surface-size
  crt 1 [
    set shape "square"
    set size half-surface-size
  ]
end

to make-half-size-circle
  clear-all
  ; assumes we want a circle shape
  let half-surface-size 2 * sqrt ((world-width * world-height / 2) / pi)
  show half-surface-size
  crt 1 [
    set shape "circle"
    set size half-surface-size
  ]
end

A couple extra bits of info, though:

  1. The size only controls the visual size of the turtle in the world view. It still only lives on a single patch. If you want to get all turtles/patches "under" the turtle shape you'll need to use in-radius (for a circle) or do a bounding-box check using the turtle's size (for a square).
  2. The turtle might not quite appear to take up half the surface area. This is because the shape the turtle uses might not go all the way to the edge of its possible size. Even the square shape that comes with NetLogo doesn't quite have its edges all the way at the end, but the circle does.

Upvotes: 2

Related Questions