"""
Python生成随机验证码，需要使用PIL模块.
参考资料：https://www.cnblogs.com/wupeiqi/articles/5812291.
要用到字体文件 ，和本文件放到一个目录下
pip3 install pillow
"""
import random
from PIL import Image, ImageDraw, ImageFont,ImageFilter


def check_code(width=120, height=50, char_length=4, font_file='kumo.ttf', font_size=28):
    code = []
    img = Image.new(mode='RGB', size=(width, height), color=(255, 255, 255))
    draw = ImageDraw.Draw(img, mode='RGB')

    def rndChar():
        """
        生成随机字母,也可以是数字
        :return:
        """
        # return chr(random.randint(65, 90))
        return str(random.randint(0,9))

    def rndColor():
        """
        生成随机颜色
        :return:
        """
        return (random.randint(0, 255), random.randint(10, 255), random.randint(64, 255))

    # 写文字
    font = ImageFont.truetype(font_file, font_size)
    for i in range(char_length):
        char = rndChar()
        code.append(char)
        h = random.randint(0, 4)
        draw.text([i * width / char_length, h], char, font=font, fill=rndColor())

    # # 写干扰点
    # for i in range(1):
    #     draw.point([random.randint(0, width), random.randint(0, height)], fill=rndColor())
    #
    # # 写干扰圆圈
    # for i in range(1):
    #     draw.point([random.randint(0, width), random.randint(0, height)], fill=rndColor())
    #     x = random.randint(0, width)
    #     y = random.randint(0, height)
    #     draw.arc((x, y, x + 4, y + 4), 0, 90, fill=rndColor())

    # 画干扰线
    # for i in range(1):
    #     x1 = random.randint(0, width)
    #     y1 = random.randint(0, height)
    #     x2 = random.randint(0, width)
    #     y2 = random.randint(0, height)
    #
    #     draw.line((x1, y1, x2, y2), fill=rndColor())

    img = img.filter(ImageFilter.EDGE_ENHANCE_MORE)
    # 返回两个参数，img是图片,code是生成的字符
    return img, ''.join(code)

#
# if __name__ == '__main__':
#     img, code_str = check_code()
#     print(code_str)
#     # 1. 直接打开
#     # img,code = check_code()
#     img.show()
#
#     # 2. 写入文件
#     # img,code = check_code()
#     # with open('code.png','wb') as f:
#     #     img.save(f,format='png')
#
#     # 3. 写入内存(Python3)
#     # from io import BytesIO
#     # stream = BytesIO()
#     # img.save(stream, 'png')
#     # stream.getvalue()
#
#     # 4. 写入内存（Python2）
#     # import StringIO
#     # stream = StringIO.StringIO()
#     # img.save(stream, 'png')
#     # stream.getvalue()