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77 lines
2 KiB
Python
77 lines
2 KiB
Python
#!/usr/bin/env python
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#
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# gen_stars.py
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# interface
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#
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# Created by Tobias Schwinger on 3/22/13.
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# Copyright (c) 2013 High Fidelity, Inc. All rights reserved.
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#
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# Input file generator for the starfield.
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from random import random,randint
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from math import sqrt, hypot, atan2, pi, fmod, degrees
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from sys import argv,stderr
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hemisphere_only, equator, meridians=False, 0, 1000
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n_random = 50000
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if len(argv) > 1:
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n_random = int(argv[1])
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bars_total, bars_prev = 77, 0
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def meridian(azimuth,n,(r0,g0,b0),(r1,g1,b1)):
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alts = 180.0/n
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for alti in range(n):
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# color
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altj = n-alti-1
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r = (r0 *altj+alti* r1)/n
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g = (g0 *altj+alti* g1)/n
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b = (b0 *altj+alti* b1)/n
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# position
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altitude = alts*alti
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print "%f %f #%02x%02x%02x" % (azimuth,altitude,r,g,b)
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print "%f %f #%02x%02x%02x" % (azimuth,-altitude,r,g,b)
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#if meridians:
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#meridian( 0,meridians,(255,255,255), (180, 60,255)) # N->S
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#meridian(90,meridians,( 80,255, 80), (255,240, 40)) # E->W
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if equator:
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azis = 360.0/equator
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for azii in range(equator):
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azimuth = azis*azii
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print "%f %f #%02x%02x%02x" % (azimuth,0,255,255,255)
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for i in range(n_random):
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# color
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w = randint(30,randint(40,255))
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r = max(0,min(255,w + randint(-10,70)))
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g = max(0,min(255,w + randint(-20,60)))
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b = max(0,min(255,w + randint(-10,100)))
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# position
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while True:
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x,y,z = random()*2-1,random(),random()*2-1
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if not hemisphere_only:
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y = y*2-1
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l = sqrt(x*x + y*y + z*z)
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if l <= 1.0:
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break
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x /= l; y /= l; z /= l
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xz = hypot(x,z)
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azimuth = degrees(fmod(atan2(x,z)+pi,2*pi))
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altitude = degrees(atan2(y,xz))
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bars = round(bars_total*i/n_random)
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if bars != bars_prev:
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bars_prev = bars
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bars = int(bars)
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stderr.write('\r[%s%s]' % ('#' * bars, '-' * (bars_total-bars)))
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print "%f %f #%02x%02x%02x" % (azimuth,altitude,r,g,b)
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stderr.write('\r[%s]\n' % ('#' * bars_total,))
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