import urllib.request
# 缓存图片到文件中
def cache_image(image_url, filename):
urllib.request.urlretrieve(image_url, filename)
# 将图片读入为二进制数据并返回点阵图字符串
def image_to_dots(filename):
with open(filename, 'rb') as f:
data = f.read()
return ','.join('#{:06x}'.format(byte) for byte in data)
# 将点阵图字符串转换为二进制数据并保存为图片文件
def dots_to_image(dots, filename):
with open(filename, 'wb') as f:
for hex_color in dots.split(','):
color = int(hex_color[1:], 16)
f.write(bytes([color]))
# 查询点阵图长度
def dots_length(dots):
return len(dots.split(','))
# 分段返回点阵图字符串
def split_dots(filename):
with open(filename, 'rb') as f:
data = f.read()
dots = ','.join('#{:06x}'.format(byte) for byte in data)
segment_length = 256
num_segments = (len(dots) + segment_length - 1) // segment_length
return num_segments
# 分段返回指定的点阵图字符串
def get_segmented_dots(filename, segment_num):
with open(filename, 'rb') as f:
data = f.read()
dots = ','.join('#{:06x}'.format(byte) for byte in data)
segment_length = 256
start = (segment_num - 1) * segment_length
end = min(segment_num * segment_length, len(dots))
return dots[start:end]
# 示例用法
image_url = 'https://example.com/image.jpg'
filename = 'image.jpg'
# 缓存图片到文件中
cache_image(image_url, filename)
# 计算点阵图长度并分段返回
num_segments = split_dots(filename)
print('总段数:', num_segments)
# 分段返回指定的点阵图
for i in range(num_segments):
segment = get_segmented_dots(filename, i+1)
print(f'第 {i+1} 段点阵:{segment}')