Author: eudoxos
Date: 2009-05-23 12:26:22 +0200 (Sat, 23 May 2009)
New Revision: 1773
Modified:
trunk/gui/py/utils.py
Log:
1. Add utils.regularSphereOrthoPack by Anoton
Modified: trunk/gui/py/utils.py
===================================================================
--- trunk/gui/py/utils.py 2009-05-23 07:23:56 UTC (rev 1772)
+++ trunk/gui/py/utils.py 2009-05-23 10:26:22 UTC (rev 1773)
@@ -448,3 +448,45 @@
def vmData():
l=procStatus('VmData'); ll=l.split(); assert(ll[2]=='kB')
return int(ll[1])
+
+
+
+def xcombine(*seqin):
+ '''returns a generator which returns combinations of argument sequences
+for example xcombine((1,2),(3,4)) returns a generator; calling the next()
+method on the generator will return [1,3], [1,4], [2,3], [2,4] and
+StopIteration exception. This will not create the whole list of
+combinations in memory at once.
+
+Source: http://code.activestate.com/recipes/302478/'''
+ def rloop(seqin,comb):
+ '''recursive looping function'''
+ if seqin: # any more sequences
to process?
+ for item in seqin[0]:
+ newcomb=comb+[item] # add next item to
current combination
+ # call rloop w/ remaining seqs, newcomb
+ for item in rloop(seqin[1:],newcomb):
+ yield item # seqs and
newcomb
+ else: # processing
last sequence
+ yield comb # comb
finished, add to list
+ return rloop(seqin,[])
+
+
+def regularSphereOrthoPack(center,extents,radius,gap,**kw):
+ """Return set of spheres regularly spaced in either a box or sphere
centered around center.
+ If extents is a number, it is taken for sphere radius; if it is a
sequence, it is 3 extents of the box.
+ Created spheres will have given radius and will be separated by gap
space.
+ """
+ from numpy import arange; from math import sqrt
+ ret=[]
+ try: # extents is a single number, do sphere
+ doSphere=True; dim=float(extents),float(extents),float(extents)
+ except TypeError: # extents is a list, do box
+ doSphere=False; dim=extents
+ xx,yy,zz=[arange(center[i]-dim[i],center[i]+dim[i],2*radius+gap) for i
in 0,1,2]
+ for xyz in xcombine(xx,yy,zz):
+ if doSphere and sqrt(sum([(xyz[i]-center[i])**2 for i in
0,1,2]))>extents: continue
+ ret+=[sphere(xyz,radius=radius,**kw)]
+ return ret
+
+
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