synergine2/sandbox/engulf/behaviour.py

from synergine2.simulation import SubjectBehaviour
from synergine2.simulation import Event


class GrassGrownUp(Event):
    def __init__(self, subject_id, density, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.subject_id = subject_id
        self.density = density


class GrowUp(SubjectBehaviour):
    frequency = 20

    def run(self, data):
        return True

    def action(self, data) -> [Event]:
        self.subject.density += 1
        return [GrassGrownUp(
            self.subject.id,
            self.subject.density,
        )]