def overview(N,typ,dat,width=256,height=256,color=(255,90,0),C=None,CS=None):
if not C: C = classification.random(N,3)
#if not CS: CS = fade(steps=1,left=color,right=color,borders=(0,0,0))
if not CS: CS = fade(steps=C.n,borders=(0,0,0))
#if typ in 'CD':
# dat = base64.b64decode(dat)
if typ == 'B':
dat = int(dat)
return TILE_TYPE_DISPATCH[typ](C,CS,dat,width,height)
def cache_file_to_PNGs(tileData='/Users/charlie/Documents/data/usa/usa_cache.csv',N=3111):
""" This function is designed to help Demo and Profile the rendering code,
It processes a txt file containing the output of the DynTileMapper GUI
Each line the in txt file is turned into a PNG image with a random classification
"""
C = classification.random(N,200)
CS = fade(steps=198,left=(255,255,0),right=(0,255,255),borders=(255,0,0))
f = open(tileData,'r')
header = f.next() #header
for line in f:
z,x,y,tileType,tile = line.strip().split(',')
fname = '%s+%s+%s.png'%(z,x,y)
if tileType in 'CD':
tile = base64.b64decode(tile)
elif tileType == 'B':
tile = int(tile)
s = TILE_TYPE_DISPATCH[tileType](C,CS,tile)
o = open('out/'+fname,'wb')
o.write(s)
o.close()