Created
December 18, 2013 02:01
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from PIL import Image | |
""" | |
# if you don't have the image and you do have 'requests', uncomment temporarily | |
import requests | |
GRAPH_URL = 'http://www.spotifyartists.com/site/wp-content/uploads/2013/09/First-Chart.png' | |
open('First-Chart.png', 'wb').write(requests.get(GRAPH_URL).content) | |
""" | |
PHYSICAL_COLOR = (185, 185, 185) | |
DOWNLOAD_COLOR = (119, 119, 118) | |
GRAPH_START_X = 150 # graph starts around 150px from the left | |
GRAPH_START_Y = 90 # graph starts around 95px from the bottom | |
NUM_YEARS_DEPICTED = 15.0 | |
INDUSTRY_PEAK = 28.0 # about $28B at peak of industry by my eye | |
image = Image.open("First-Chart.png") | |
pixels = image.load() | |
# raw pixel heights for each | |
physical_heights = [] | |
download_heights = [] | |
width, height = image.size | |
for col in range(GRAPH_START_X, width): | |
min_physical, min_download = height, height | |
max_physical, max_download = 0, 0 | |
for row in range(height - GRAPH_START_Y): | |
color = pixels[col, row] | |
if color == PHYSICAL_COLOR: | |
min_physical = min(min_physical, row) | |
max_physical = max(max_physical, row) | |
elif color == DOWNLOAD_COLOR: | |
min_download = min(min_download, row) | |
max_download = max(max_download, row) | |
physical = max(max_physical - min_physical, 0) | |
download = max(max_download - min_download, 0) | |
physical_heights.append(physical) | |
download_heights.append(download) | |
both_heights = zip(physical_heights, download_heights) | |
both_heights = [hs for hs in both_heights if hs[0] != 0 or hs[1] != 0] | |
phys_only = [p for (p,d) in both_heights] | |
dl_only = [d for (p,d) in both_heights] | |
best_total = max(x+y for (x,y) in both_heights) | |
px_per_billion = best_total / INDUSTRY_PEAK | |
px_per_year = len(both_heights) / NUM_YEARS_DEPICTED | |
print "~%.2f vertical pixels per $billion" % px_per_billion | |
print "~%.2f horizontal pixels per year" % px_per_year | |
def trend(data, lookback): | |
# returns str representation of trend in billions per year | |
vpx_per_hpx = (data[-1] - data[-int(lookback-1)])/float(int(lookback)) | |
b = vpx_per_hpx*px_per_year/px_per_billion | |
sign = '-' if b < 0 else '+' | |
return "%s$%.1fB/yr" % (sign, abs(b)) | |
print "physical trends:" | |
for y in (1,3,5): | |
print trend(phys_only, y*px_per_year), "(%syear)" % y | |
print "download trends:" | |
for y in (1,3,5): | |
print trend(dl_only, y*px_per_year), "(%syear)" % y | |
print "last physical dollars per year: $%.2fB" % (phys_only[-1]/px_per_billion) | |
print "last download dollars per year: $%.2fB" % (dl_only[-1]/px_per_billion) |
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