forked from mirror/MrDoc
111 lines
4.1 KiB
Python
111 lines
4.1 KiB
Python
#!/usr/bin/env python
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# coding:utf-8
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# 生成验证码图片
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import random
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import os
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from PIL import Image, ImageDraw, ImageFont, ImageFilter
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from django.conf import settings
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_letter_cases = "abcdefghjkmnpqrstuvwxy" # 小写字母，去除可能干扰的i，l，o，z
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_upper_cases = _letter_cases.upper() # 大写字母
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_numbers = ''.join(map(str, range(3, 10))) # 数字
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init_chars = ''.join((_letter_cases, _upper_cases, _numbers))
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static_path = os.path.join(settings.BASE_DIR,"static") # 静态文件路径
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font_path = os.path.join(static_path,"MONACO.TTF") # 字体路径
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def create_validate_code(size=(120, 30),
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chars=init_chars,
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img_type="GIF",
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mode="RGB",
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bg_color=(255, 255, 255),
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fg_color=(0, 0, 255),
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font_size=18,
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font_type=font_path,
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length=4,
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draw_lines=True,
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n_line=(1, 2),
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draw_points=True,
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point_chance = 2):
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'''
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@todo: 生成验证码图片
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@param size: 图片的大小，格式（宽，高），默认为(120, 30)
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@param chars: 允许的字符集合，格式字符串
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@param img_type: 图片保存的格式，默认为GIF，可选的为GIF，JPEG，TIFF，PNG
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@param mode: 图片模式，默认为RGB
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@param bg_color: 背景颜色，默认为白色
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@param fg_color: 前景色，验证码字符颜色，默认为蓝色#0000FF
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@param font_size: 验证码字体大小
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@param font_type: 验证码字体，默认为 ae_AlArabiya.ttf
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@param length: 验证码字符个数
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@param draw_lines: 是否划干扰线
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@param n_lines: 干扰线的条数范围，格式元组，默认为(1, 2)，只有draw_lines为True时有效
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@param draw_points: 是否画干扰点
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@param point_chance: 干扰点出现的概率，大小范围[0, 100]
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@return: [0]: PIL Image实例
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@return: [1]: 验证码图片中的字符串
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'''
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width, height = size # 宽， 高
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img = Image.new(mode, size, bg_color) # 创建图形
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draw = ImageDraw.Draw(img) # 创建画笔
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def get_chars():
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'''生成给定长度的字符串，返回列表格式'''
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return random.sample(chars, length)
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def create_lines():
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'''绘制干扰线'''
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line_num = random.randint(*n_line) # 干扰线条数
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for i in range(line_num):
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# 起始点
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begin = (random.randint(0, size[0]), random.randint(0, size[1]))
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#结束点
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end = (random.randint(0, size[0]), random.randint(0, size[1]))
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draw.line([begin, end], fill=(0, 0, 0))
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def create_points():
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'''绘制干扰点'''
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chance = min(100, max(0, int(point_chance))) # 大小限制在[0, 100]
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for w in range(width):
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for h in range(height):
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tmp = random.randint(0, 100)
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if tmp > 100 - chance:
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draw.point((w, h), fill=(0, 0, 0))
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def create_strs():
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'''绘制验证码字符'''
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c_chars = get_chars()
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strs = ' %s ' % ' '.join(c_chars) # 每个字符前后以空格隔开
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font = ImageFont.truetype(font_type, font_size)
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font_width, font_height = font.getsize(strs)
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draw.text(((width - font_width) / 3, (height - font_height) / 3),
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strs, font=font, fill=fg_color)
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return ''.join(c_chars)
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if draw_lines:
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create_lines()
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if draw_points:
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create_points()
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strs = create_strs()
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# 图形扭曲参数
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params = [1 - float(random.randint(1, 2)) / 100,
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0,
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0,
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0,
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1 - float(random.randint(1, 10)) / 100,
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float(random.randint(1, 2)) / 500,
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0.001,
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float(random.randint(1, 2)) / 500
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]
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img = img.transform(size, Image.PERSPECTIVE, params) # 创建扭曲
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img = img.filter(ImageFilter.EDGE_ENHANCE_MORE) # 滤镜，边界加强（阈值更大）
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return img, strs |