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ABAP

{% def random n:1 %}
  {% if n|equal 1|or (n|is_a "float") %}
    {{|rand|times n}}
  {% else %}
    {{|rand|times n|round}}
  {% end %}
{% end %}

puts Contact.all.map { |c| "C#{c.id} [style=filled,color=greenyellow]"  } +
  Book.all.map { |b| "B#{b.id} [style=filled,color=lightcyan]" } +
  BookContact.all.map { |bc| "C#{bc.contact_id} -> B#{bc.book_id}" }

digraph G {

• there is a fixed width/height rectangle board
• players are circles
• every player start at size 10 let's say
• when somebody goes off the board (player B) the last player (A) who touched player B gets half of its "weight" added
  • perimeter is pi * r**2
  • so the new perimeter is (pi * rA**2) + (pi * rB**2)/2
  • new radius is pi * r**2 = (pi * rA**2) + (pi * rB**2)/2
  • r = sqrt(((pi * rA**2) + (pi * rB**2)/2)/2)
• acceleration is proportional to weight (so the larger the slower)
• when touching another player forces are distributed by weight (e.g. small player can't push large player much)

• content_for?(false) false
• content_for(false) nil
• yield(false) ""

• content_for?(true) false