from random import choice, randint, randrange
import string
from PIL import Image, ImageDraw, ImageFont

#返回length长度随机字母和数字
def selectedCharacters(length):
    result = ''.join(choice(string.ascii_letters+string.digits) for _ in range(length))
    return result

#返回随机色
def getColor():
    r = randint(0,255)
    g = randint(0,255)
    b = randint(0,255)
    return (r,g,b)

def makeIMG():
    #图片属性
    size=[200,100]
    characterNumber=6
    bgcolor=(255,255,255)
    imageTemp = Image.new('RGB', size, bgcolor)
    draw = ImageDraw.Draw(imageTemp)
    text = selectedCharacters(characterNumber)
    font = ImageFont.truetype('c:\\windows\\fonts\\BRADHITC.TTF', 48)
    width, height = draw.textsize(text, font)
    
    #判断尺寸
    if width+2*characterNumber>size[0] or height>size[1]:
        print('Dimension are not legitimate')
        return
    
    # 随机字符位置
    startX = 0
    widthEachCharater = width//characterNumber
    for i in range(characterNumber):
        startX += widthEachCharater + 1
        position = (startX, (size[1]-height)//2+randint(-5,5))
        draw.text(xy=position, text=text[i], font=font, fill=getColor())
        
    # 对像素位置进行微调，实现扭曲的效果
    imageFinal = Image.new('RGB', size, bgcolor)
    pixelsFinal = imageFinal.load()
    pixelsTemp = imageTemp.load()
    for y in range(size[1]):
        offset = randint(-1,0)
        for x in range(size[0]):
            newx = x+offset
            if newx>=size[0]:
                newx = size[0]-1
            elif newx<0:
                newx = 0
            pixelsFinal[newx,y] = pixelsTemp[x,y]

    # 随机色像素点            
    draw = ImageDraw.Draw(imageFinal)
    for i in range(int(size[0]*size[1]*0.05)):
        draw.point((randrange(size[0]), randrange(size[1])), fill=getColor())

    # 绘制5条随机干扰直线
    for i in range(5):
        start = (0, randrange(size[1]))
        end = (size[0], randrange(size[1]))
        draw.line([start, end], fill=getColor(), width=1)

    # 绘制5条随机弧线
    for i in range(5):
        start = (-50, -50)
        end = (size[0]+10, randint(0, size[1]+10))
        draw.arc(start+end, 0, 360, fill=getColor())
        
    imageFinal.save("image.jpg")
    imageFinal.show()

makeIMG()