def update(self):
"""Update the simulation by one timestep."""
stept = self._timing.routine('simulation step')
stept.start('determining tile movements')
old = set([t for shape in self._shapes for t in shape.tiles])
new = dict()
overlapping = {}
for t in self._indexedtiles:
overlapping[t] = []
for i in range(len(self._shapes)):
speed = norm(self._shapes[i].v)
group, v = move(self._indexedtiles,
self._shapes[i].tiles,
self._shapes[i].v,
self._tileadj,
self._index)
self._shapes[i] = Group(list(group.keys()), v)
for dest, sources in group.items():
if dest in new:
new[dest].append(TileMovement(sources, speed))
else:
new[dest] = [TileMovement(sources, speed)]
overlapping[dest].append(i)
stept.start('applying tile movements')
collisions = {}
newe = {}
seen = set()
for dest, movements in new.items():
# get all the source tiles contributing to this one
newe[dest] = NextTileValue(movements)
if not dest in seen:
try:
old.remove(dest)
except KeyError:
# calculate the amount to build up the leading edge
newe[dest].build(self._build * sum([m.speed for m in movements])/len(movements))
seen.add(dest)
for pair in combinations(overlapping[dest], 2):
if pair in collisions:
collisions[pair] += 1
else:
collisions[pair] = 1
# apply the new values
for t, e in newe.items():
e.apply(t)
# clear out abandoned tiles
for t in old:
t.emptyocean(self.seafloor())
# record each continent's total pre-erosion above-sea size
heights = [sum([t.elevation for t in s.tiles]) for s in self._shapes]
if self.hasatmosphere:
stept.start('"simulating" climate')
seasons = [0.1*v for v in list(range(-10,10,5)) + list(range(10,-10,-5))]
c = climate(self.tiles, self.adj, seasons, self.cells, self.spin, self.tilt, self.temprange, 0.5, self.haslife, self._climatemappings, self._climateprof)
if self._climateprof:
self._climateprof.dump_stats('climate.profile')
for v, tile in self.tiles.items():
tile.climate = c[v]['classification']
tile.seasons = c[v]['seasons']
stept.start('determining erosion')
erosion = erode(self.tiles, self.adj)
for t in self.tiles.values():
t.erode(erosion, self._erode)
for t in self.tiles.values():
# if the tile is in at least one shape, apply the erosion materials
if len(overlapping[t]) > 0:
if len(erosion[t].materials) > 0:
t.deposit(sedimentary.deposit(erosion[t].materials, self.haslife, False, t.climate))
# otherwise, require a certain threshold
elif sum([m.amount for m in erosion[t].materials]) > 1.5:
t.deposit(sedimentary.deposit(erosion[t].materials, self.haslife, True, t.climate))
sourceshapes = set()
for e in erosion[t].sources:
for shape in overlapping[e]:
sourceshapes.add(shape)
for s in sourceshapes:
if not t in self._shapes[s].tiles:
self._shapes[s].tiles.append(t)
overlapping[t] = list(sourceshapes)
if self._lifeticks:
self._lifeticks -= 1
else:
self._atmosphereticks -= 1
stept.start('applying isostatic effects')
for s, h in zip(self._shapes, heights):
dh = (h - sum([t.elevation for t in s.tiles]))/float(len(s.tiles))
for t in s.tiles:
t.isostasize(dh)
stept.start('performing random intrusions')
for t in self.tiles.values():
if t.subduction > 0:
if random.random() < 0.1:
t.intrude(igneous.intrusive(max(0, min(1, random.gauss(0.85, 0.15)))))
t.transform(metamorphic.contact(t.substance[-1], t.intrusion))
stept.start('applying regional metamorphism')
for t in self.tiles.values():
t.transform(metamorphic.regional(t.substance[-1], t.subduction > 0))
for t in self.tiles.values():
t.cleartemp()
stept.start('merging overlapping shapes')
# merge shapes that overlap a lot
groups = []
for pair, count in collisions.items():
if count > min([len(self._shapes[i].tiles) for i in pair])/10:
for group in groups:
if pair[0] in group:
group.add(pair[1])
break
elif pair[1] in group:
group.add(pair[0])
break
else:
groups.append(set(pair))
gone = []
for group in groups:
largest = max(group, key=lambda i: len(self._shapes[i].tiles))
tiles = list(self._shapes[largest].tiles)
v = array(self._shapes[largest].v) * len(tiles)
for other in group:
if other != largest:
v += array(self._shapes[other].v) * len(self._shapes[other].tiles)
tiles += self._shapes[other].tiles
gone.append(self._shapes[other])
self._shapes[largest].tiles = list(set(tiles))
v /= len(tiles)
self._shapes[largest].v = v
for s in gone:
self._shapes.remove(s)
stept.start('randomly splitting shapes')
# occaisionally split big shapes
for i in range(len(self._shapes)):
if random.uniform(0,1) > self._splitnum / len(self._shapes[i].tiles):
self._shapes[i:i+1] = [Group(ts, self._shapes[i].v + v * self._dp)
for ts, v in split(self._shapes[i].tiles)]
stept.done()
self.dirty = True
def split(self):
a, b = [tiles for (tiles, v) in split([t for t in self.tiles.itervalues() if t.elevation == 1])]
for t in a:
t.layers = [Layer('R', 1)]
for t in b:
t.layers = [Layer('B', 1)]