如果你想自己构建它,你所需要的只是一张好的地图、该地图中每个州的一组位置以及洪水填充。
使用地图http://www.clker.com/cliparts/S/r/a/w/L/0/black-and-white-u-s-map-hi.png http://www.clker.com/cliparts/S/r/a/w/L/0/black-and-white-u-s-map-hi.png,这是我们得到的:
构建上面地图的代码由以下给出
import sys
from PIL import Image
def floodfill(img, seed, color):
im = img.load()
work = [seed]
start_color = im[seed]
while work:
x, y = work.pop()
im[x, y] = color
for dx, dy in ((-1,0), (1,0), (0,-1), (0,1)):
nx, ny = x + dx, y + dy
if im[nx, ny] == start_color:
work.append((nx, ny))
USA_MAP = Image.open(sys.argv[1]).convert('1')
POINT_STATE = {'AL': (420, 260), 'AZ': (110, 240), 'AR': (350, 250)}
painted_map = USA_MAP.convert('L')
data = {'AL': 10.5, 'AZ': 23.4, 'AR': 15.0}
# Normalize data based on the minimum weight being 0+eps and maximum 30.
for k, v in data.items():
v = v/30.
color = int(round(255 * v))
floodfill(painted_map, POINT_STATE[k], 255 - color)
painted_map.save(sys.argv[2])