def _generate_river(self, noise):
# TODO seriously starting to feel like i need a Feature type for these
# things? like, passing `noise` around is a really weird way to go
# about this. what would the state even look like though?
'''
# TODO i think this needs another flooding algorithm, which probably
# means it needs to be a lot simpler and faster...
noise_factory = discrete_perlin_noise_factory(
*self.region.size, resolution=2, octaves=1)
noise = {
point: abs(noise_factory(*point) - 0.5) * 2
for point in self.region.iter_points()
}
for point, n in noise.items():
if n < 0.2:
self.map_canvas.set_architecture(point, e.Water)
return
'''
# Build some Blob internals representing the two halves of the river.
left_side = {}
right_side = {}
river = {}
center_factory = discrete_perlin_noise_factory(
self.region.height, resolution=3)
width_factory = discrete_perlin_noise_factory(
self.region.height, resolution=6, octaves=2)
center = random_normal_int(
self.region.center().x, self.region.width / 4 / 3)
for y in self.region.range_height():
center += (center_factory(y) - 0.5) * 3
width = width_factory(y) * 2 + 5
x0 = int(center - width / 2)
x1 = int(x0 + width + 0.5)
for x in range(x0, x1 + 1):
self.map_canvas.set_architecture(Point(x, y), e.Water)
left_side[y] = (Span(self.region.left, x0 - 1),)
right_side[y] = (Span(x1 + 1, self.region.right),)
river[y] = (Span(x0, x1),)
return Blob(left_side), Blob(river), Blob(right_side)
