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#
# 20,000 Light Years Into Space
# This game is licensed under GPL v2, and copyright (C) Jack Whitham 2006-07.
#
# A model for the movement of steam within the system.
from primitives import *
class Voltage_Model:
# Don't understand steam? Confused by the thought of
# boiling water being used as a source of energy?
# Why not just assume that it's electricity.
def __init__(self):
# Invariant:
self.capacitance = 1.0
# May change:
self.charge = 0.0
self.voltage = 0.0
# Changed by upgrades
self.capacity = INITIAL_NODE_CAPACITY
TIME_CONSTANT = 0.1
NEGLIGIBLE = 0.01
def Source(self, current):
dq = current * self.TIME_CONSTANT
self.charge += dq
self.__Bound()
def Think(self, neighbour_list):
self.voltage = self.charge / self.capacitance
currents = []
for (neighbour, resist) in neighbour_list:
dir = 0
# Potential difference:
dv = self.voltage - neighbour.voltage
if ( dv >= self.NEGLIGIBLE ):
# Current flow:
i = dv / resist
# Charge flow:
dq = i * self.TIME_CONSTANT
self.charge -= dq
neighbour.charge += dq
currents.append(i)
else:
currents.append(0.0)
self.__Bound()
return currents
def __Bound(self):
if ( self.charge < 0 ):
self.charge = 0
elif ( self.charge > self.capacity ):
self.charge = self.capacity # vent
def Get_Pressure(self):
return self.charge
def Get_Capacity(self):
return self.capacity
def Capacity_Upgrade(self):
self.capacity += CAPACITY_UPGRADE
class Steam_Model(Voltage_Model):
pass
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