86 lines
2.7 KiB
Python
Executable file
86 lines
2.7 KiB
Python
Executable file
#!/usr/bin/env python
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# This script requires the following file in the assets/tmp/ directory:
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# https://github.com/astronexus/HYG-Database/blob/cbd21013d2bb89732b893be357a6f41836dbe614/hyg/CURRENT/hygdata_v41.csv
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import csv
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import sys
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import math
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#def entry(ra_hour, ra_min, ra_sec, dec_deg, dec_min, dec_sec, mag, name, color_index):
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# return [
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# ra_hour*15 + ra_min*0.25 + ra_sec*0.004166,
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# dec_deg + dec_min/60 + dec_sec/3600,
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# mag,
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# name,
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# color_index,
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# ]
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#
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#
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#CUSTOM_ENTRIES = [
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# entry(0, 42, 44.3, 41, 16, 9, 3.44-15, 0.63, "Andromeda Galaxy"),
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#]
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# Lower apparent magnitude = brighter.
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# Sun = -26.7
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# Sirius = -1.44
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# Betelgeuse = 0.45
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# Polaris (north star) = 1.97
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# Meissa (orion's head, 8th brightest star in orion) = 3.33
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MAX_APPARENT_MAGNITUDE = 7.0
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print("// This file was autogenerated by 'genrate_starchart.py' using data from")
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print("// the HYG database: https://github.com/astronexus/HYG-Database/tree/main/hyg")
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print("// License: CC BY-SA 4.0: https://creativecommons.org/licenses/by-sa/4.0/")
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print("")
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print("pub const STARS: &[[f32; 5]] = &[")
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def render(ra, dec, mag, ci, proper):
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# Takes ra/deg in degrees
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ra = float(ra)
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dec = float(dec)
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mag = float(mag)
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distance = 1.0
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ra_radians = math.radians(ra * 15) # ra is in [0, 24], multiplying by 15 gives degrees in [0, 360]
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dec_radians = math.radians(dec)
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#print(f"ra_radians={ra_radians}, dec_radians={dec_radians}, dec={dec}, ra={ra}", file=sys.stderr)
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x = distance * math.cos(dec_radians) * math.cos(-ra_radians)
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y = distance * math.cos(dec_radians) * math.sin(-ra_radians)
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z = distance * math.sin(dec_radians)
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# Correct for differences in coordinate system axes
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x, y, z = x, z, y
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comment = f" // {proper}" if proper else ""
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brightness = 2.512 ** (0 - mag)
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print(f" [{x:.04}, {y:.04}, {z:.04}, {brightness:.04}, {ci}],{comment}")
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total = 0
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count = 0
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count_extra = 0
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with open("assets/tmp/hygdata_v41.csv", "r", encoding="utf-8") as f:
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for entry in csv.DictReader(f):
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total += 1
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ra = entry['ra']
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dec = entry['dec']
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mag = entry['mag']
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ci = entry['ci']
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proper = entry['proper']
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proper = "".join([c for c in proper if c.isalnum() or c in ' -_'])
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if not all([ra, dec, mag, ci]):
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continue
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if float(mag) > MAX_APPARENT_MAGNITUDE:
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continue
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render(ra, dec, mag, ci, proper)
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count += 1
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#for entry in CUSTOM_ENTRIES:
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# render(entry[0], entry[1], entry[2], entry[3], entry[4])
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# count_extra += 1
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print("];")
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print(f"Wrote {count} stars (total={total}) + {count_extra} extra entries.", file=sys.stderr)
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