From 8a1fd4343744fc867f763ab9da166ad1e481f501 Mon Sep 17 00:00:00 2001
From: tosh <tosh@monster.hlan>
Date: Wed, 27 Mar 2013 03:28:48 +0100
Subject: [PATCH] implements a more uniform distribution of star positions and
 a progress bar

---
 interface/resources/gen_stars.py | 27 ++++++++++++++++++++++-----
 1 file changed, 22 insertions(+), 5 deletions(-)

diff --git a/interface/resources/gen_stars.py b/interface/resources/gen_stars.py
index a7244ba066..521cdab72d 100644
--- a/interface/resources/gen_stars.py
+++ b/interface/resources/gen_stars.py
@@ -9,13 +9,16 @@
 # Input file generator for the starfield. 
 
 from random import random,randint
-from sys import argv
+from math import sqrt, hypot, atan2, pi, fmod, degrees
+from sys import argv,stderr
 
-n = 1000
+n = 10
 
 if len(argv) > 1:
     n = int(argv[1])
 
+bars_total, bars_prev = 77, 0
+
 for i in range(n):
     # color
     w = randint(30,randint(40,255))
@@ -23,7 +26,21 @@ for i in range(n):
     g = max(0,min(255,w + randint(-20,60)))
     b = max(0,min(255,w + randint(-10,100)))
     # position
-    azi = random() * 360
-    alt = random() *  90
-    print "%f %f #%02x%02x%02x" % (azi,alt,r,g,b)
+    x,y,z = random()*2-1,random(),random()*2-1
+    l = sqrt(x*x + y*y + z*z)
+    x /= l; y /= l; z /= l
+    xz = hypot(x,z)
+
+    azimuth = degrees(fmod(atan2(x,z)+pi,2*pi))
+    altitude = degrees(atan2(y,xz))
+
+    bars = round(bars_total*i/n)
+    if bars != bars_prev:
+        bars_prev = bars
+        bars = int(bars)
+        stderr.write('\r[%s%s]' % ('#' * bars, '-' * (bars_total-bars)))
+
+    print "%f %f #%02x%02x%02x" % (azimuth,altitude,r,g,b)
+
+stderr.write('\r[%s]\n' % ('#' * bars_total,))