Python generates CAPTCHA instances

#!/usr/bin/env python#coding=utf-8import randomimport Image, Imagedraw, Imagefont, imagefilter _letter_cases = " Abcdefghjkmnpqrstuvwxy "# lowercase letters, removing potentially disturbing i,l,o,z_upper_cases = _letter_cases.upper () # uppercase letters _numbers = '. Join (Map (str, Range (3, 10)) # number Init_chars = '. Join ((_letter_cases, _upper_cases, _numbers)) fonttype= "/usr/share/fonts/truetype/                             Freefont/freesans.ttf "Def create_validate_code (size=), Chars=init_chars, Img_type= "GIF", mode= "RGB", bg_color= (255, 255, 2                             , fg_color= (0, 0, 255), font_size=18,                             Font_type=fonttype, length=4, Draw_lines=true, N_line= (1, 2), draw_points=true, point_chance = 2): ' "@todo: Generate Captcha picture @param size: Picture size, format (wide, high), the default is (+), @param chars: The allowed character set, format string @param img_type: The format of the picture save, the default is GIF, optional is gif,jpeg,tiff,png @param mode: The default is R GB @param bg_color: Background color, default is white @param fg_color: foreground color, captcha character color, default is blue #0000ff @param font_size: captcha font size @param font_type: Test Code font, the default is Ae_alarabiya.ttf @param length: The number of verification code characters @param Draw_lines: whether the interference line @param n_lines: The number of interference lines, format tuples, the default is (1, 2), only Dr Aw_lines valid @param draw_points: whether to draw the disturbance point @param point_chance: Probability of the occurrence of the disturbance point, size range [0] @return: [0]: PIL Image instance @retu RN: [1]: The string "width in the captcha picture, height = size # wide, high img = image.new (mode, size, bg_color) # Create graphic draw = Imagedraw.dr AW (IMG) # Create brush if Draw_lines:create_lines (draw,n_line,width,height) if Draw_points:create_points (Draw,point_chan Ce,width,height) STRs = Create_strs (Draw,chars,length,font_type, Font_size,width,height,fg_color) # graphics warp parameter params = [ 1-float (Random.randint (1, 2))/0, 0, 0, 1-float (random.randint (1, 10 )/, FloAt (Random.randint (1, 2))/$, 0.001, float (random.randint (1, 2)/+) img = Img.tra Nsform (Size, image.perspective, params) # Create twist img = Img.filter (imagefilter.edge_enhance_more) # Filter, Edge Enhancement (threshold value) retur n img, STRs def create_lines (draw,n_line,width,height): ' Draw interference line ' ' Line_num = Random.randint (n_line[0],n_line[1]) # Number of interference lines for I in range (line_num): # start point begin = (Random.randint (0, width), random.randint (0, height)) #结束点 end = (Random.randint (0, width), random.randint (0, height)) draw.line ([begin, end], fill= (0, 0, 0)) def create_points (draw , point_chance,width,height): ' Draw disturbance point ' chance = min (max (0, Int (point_chance))) # size limit at [0, +] for W in Xrang E (width): for h in xrange (height): tmp = Random.randint (0, +) if tmp > 100-chance:draw.point (( W, h), fill= (0, 0, 0)) def create_strs (Draw,chars,length,font_type, Font_size,width,height,fg_color): "' Draw the captcha character '" Generates a string of the given length, returning the list format ' C_chars = Random.sample (chars, length) STRs = '%s '% '. Join (C_chars) # Each character is separated by a space before and after the font = Imagefont.truetype (font_t Ype, Font_size) font_width, font_height = Font.getsize (STRs) Draw.text (((width-font_width)/3, (Height-font_heigh T)/3), STRs, Font=font, Fill=fg_color) return ". Join (c_chars) if __name__ = =" __main__ ": code_img = Create_val Idate_code () code_img[0].save ("Validate.gif", "gif") print code_img[1]

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