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noiseengine.py
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noiseengine.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# noiseengine.py
#
# NOTE!:
# pip3 install opensimplex
#
# implements a simple 1D noise generator.
#
# call next to get a perlin random in range -1..1
# call next with optional offset to get value ahead/behind the next val
# this is good for random x/y position value
# call nextMapped to get that value mapped to any range.
try:
from opensimplex import OpenSimplex
except:
print ('opensimplex not found.')
print('To install opensimplex: pip3 install opensimplex')
class NoiseEngine1D():
def __init__(self, seed=1):
self.engine = OpenSimplex(seed)
self.smoothness = 20
self.x = 1
def maprange(self, a, b, val):
# map val from range a to range b
(a1, a2), (b1, b2) = a, b
return b1 + ((val - a1) * (b2 - b1) / (a2 - a1))
def next(self, offset=0):
# return next value of noise
self.x += 1
return self.engine.noise2d(1, (self.x + offset) / self.smoothness)
def nextMapped(self, mn, mx, offset=0):
n = self.next(offset)
return self.maprange((-1,1),(mn,mx),n)