import random
from PIL import Image, ImageDraw, ImageFont, ImageFilter
_letter_cases = "abcdefghjkmnpqrstuvwxy" # 小寫字母,去除可能幹擾的i,l,o,z
_upper_cases = _letter_cases.upper() # 大寫字母
_numbers = ''.join(map(str, range(3, 10))) # 數字
init_chars = ''.join((_letter_cases, _upper_cases, _numbers))
def create_validate_code(size=(120, 30),
chars=init_chars,
img_type="GIF",
mode="RGB",
bg_color=(255, 255, 255),
fg_color=(0, 0, 255),
font_size=18,
font_type="Monaco.ttf",
length=4,
draw_lines=True,
n_line=(1, 2),
draw_points=True,
point_chance=2):
"""
@todo: 生成驗證碼圖片
@param size: 圖片的大小,格式(寬,高),默認為(120, 30)
@param chars: 允許的字符集合,格式字符串
@param img_type: 圖片保存的格式,默認為GIF,可選的為GIF,JPEG,TIFF,PNG
@param mode: 圖片模式,默認為RGB
@param bg_color: 背景顏色,默認為白色
@param fg_color: 前景色,驗證碼字符顏色,默認為藍色#0000FF
@param font_size: 驗證碼字體大小
@param font_type: 驗證碼字體,默認為 ae_AlArabiya.ttf
@param length: 驗證碼字符個數
@param draw_lines: 是否劃幹擾線
@param n_lines: 幹擾線的條數範圍,格式元組,默認為(1, 2),只有draw_lines為True時有效
@param draw_points: 是否畫幹擾點
@param point_chance: 幹擾點出現的概率,大小範圍[0, 100]
@return: [0]: PIL Image實例
@return: [1]: 驗證碼圖片中的字符串
"""
width, height = size # 寬高
# 創建圖形
img = Image.new(mode, size, bg_color)
draw = ImageDraw.Draw(img) # 創建畫筆
def get_chars():
"""生成給定長度的字符串,返回列表格式"""
return random.sample(chars, length)
def create_lines():
"""繪制幹擾線"""
line_num = random.randint(*n_line) # 幹擾線條數
for i in range(line_num):
# 起始點
begin = (random.randint(0, size[0]), random.randint(0, size[1]))
# 結束點
end = (random.randint(0, size[0]), random.randint(0, size[1]))
draw.line([begin, end], fill=(0, 0, 0))
def create_points():
"""繪制幹擾點"""
chance = min(100, max(0, int(point_chance))) # 大小限制在[0, 100]
for w in range(width):
for h in range(height):
tmp = random.randint(0, 100)
if tmp > 100 - chance:
draw.point((w, h), fill=(0, 0, 0))
def create_strs():
"""繪制驗證碼字符"""
c_chars = get_chars()
strs = ' %s ' % ' '.join(c_chars) # 每個字符前後以空格隔開
# font = ImageFont.truetype(font_type, font_size)
font = ImageFont.load_default().font
font_width, font_height = font.getsize(strs)
draw.text(((width - font_width) / 3, (height - font_height) / 3),
strs, font=font, fill=fg_color)
return ''.join(c_chars)
if draw_lines:
create_lines()
if draw_points:
create_points()
strs = create_strs()
# 圖形扭曲參數
params = [1 - float(random.randint(1, 2)) / 100,
0, 0, 0, 1 - float(random.randint(1, 10)) / 100, float(random.randint(1, 2)) / 500, 0.001, float(random.randint(1, 2)) / 500 ]
img = img.transform(size, Image.PERSPECTIVE, params) # 創建扭曲
img = img.filter(ImageFilter.EDGE_ENHANCE_MORE) # 濾鏡,邊界加強(閾值更大)