Mercurial > ift6266
annotate data_generation/transformations/pycaptcha/Captcha/Visual/Text.py @ 244:39421555993f
small change in gimp_script to avoid blurring in PNIST
| author | Xavier Glorot <glorotxa@iro.umontreal.ca> |
|---|---|
| date | Tue, 16 Mar 2010 12:12:20 -0400 |
| parents | 81f8466dc121 |
| children |
| rev | line source |
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| 87 | 1 """ Captcha.Visual.Text |
| 2 | |
| 3 Text generation for visual CAPTCHAs. | |
| 4 """ | |
| 5 # | |
| 6 # PyCAPTCHA Package | |
| 7 # Copyright (C) 2004 Micah Dowty <micah@navi.cx> | |
| 8 # | |
| 9 | |
| 10 import random, os | |
| 11 from Captcha import Visual, File | |
| 12 import ImageFont, ImageDraw | |
| 13 | |
| 14 | |
| 15 class FontFactory(File.RandomFileFactory): | |
| 16 """Picks random fonts and/or sizes from a given list. | |
| 17 'sizes' can be a single size or a (min,max) tuple. | |
| 18 If any of the given files are directories, all *.ttf found | |
| 19 in that directory will be added. | |
| 20 """ | |
|
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21 extensions = [".ttf", ".TTF"] |
| 87 | 22 basePath = "fonts" |
| 23 | |
| 24 # arguments variables a modifier pour mettre le chemin vers les fontes. | |
| 25 def __init__(self, sizes, *fileNames): | |
| 26 File.RandomFileFactory.__init__(self, *fileNames) | |
| 27 | |
| 28 if type(sizes) is tuple: | |
| 29 self.minSize = sizes[0] | |
| 30 self.maxSize = sizes[1] | |
| 31 else: | |
| 32 self.minSize = sizes | |
| 33 self.maxSize = sizes | |
| 34 | |
| 35 def pick(self): | |
| 36 """Returns a (fileName, size) tuple that can be passed to ImageFont.truetype()""" | |
| 37 fileName = File.RandomFileFactory.pick(self) | |
| 38 size = int(random.uniform(self.minSize, self.maxSize) + 0.5) | |
| 39 return (fileName, size) | |
| 40 | |
| 41 # Predefined font factories | |
|
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42 defaultFontFactory = FontFactory(25, "/Tmp/allfonts") |
| 87 | 43 #defaultFontFactory = FontFactory((30, 40), "vera") |
| 44 | |
| 45 class TextLayer(Visual.Layer): | |
| 46 """Represents a piece of text rendered within the image. | |
| 47 Alignment is given such that (0,0) places the text in the | |
| 48 top-left corner and (1,1) places it in the bottom-left. | |
| 49 | |
| 50 The font and alignment are optional, if not specified one is | |
| 51 chosen randomly. If no font factory is specified, the default is used. | |
| 52 """ | |
| 53 def __init__(self, text, | |
| 54 alignment = None, | |
| 55 font = None, | |
| 56 fontFactory = None, | |
| 57 textColor = "white", | |
| 58 borderSize = 0, | |
| 59 borderColor = None, | |
| 60 ): | |
| 61 if fontFactory is None: | |
| 62 global defaultFontFactory | |
| 63 fontFactory = defaultFontFactory | |
| 64 | |
| 65 if font is None: | |
| 66 font = fontFactory.pick() | |
| 67 | |
| 68 if alignment is None: | |
| 69 alignment = (random.uniform(0,1), | |
| 70 random.uniform(0,1)) | |
| 71 | |
| 72 self.text = text | |
| 73 self.alignment = alignment | |
| 74 self.font = font | |
| 75 self.textColor = textColor | |
| 76 self.borderSize = borderSize | |
| 77 self.borderColor = borderColor | |
| 78 | |
| 79 def render(self, img): | |
|
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80 |
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81 i=1 |
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82 while True: |
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83 try: |
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84 font = ImageFont.truetype(*self.font) |
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85 break |
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86 except: |
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87 print "try#", i, self.font |
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88 i += 1 |
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Transient exception handling in captchas (ie. lorsque le NFS est temporairement inaccessible)
boulanni <nicolas_boulanger@hotmail.com>
parents:
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89 if i>10: raise |
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81f8466dc121
Transient exception handling in captchas (ie. lorsque le NFS est temporairement inaccessible)
boulanni <nicolas_boulanger@hotmail.com>
parents:
167
diff
changeset
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90 |
| 87 | 91 textSize = font.getsize(self.text) |
| 92 draw = ImageDraw.Draw(img) | |
| 93 | |
| 94 # Find the text's origin given our alignment and current image size | |
| 95 x = int((img.size[0] - textSize[0] - self.borderSize*2) * self.alignment[0] + 0.5) | |
| 96 y = int((img.size[1] - textSize[1] - self.borderSize*2) * self.alignment[1] + 0.5) | |
| 97 | |
| 98 # Draw the border if we need one. This is slow and ugly, but there doesn't | |
| 99 # seem to be a better way with PIL. | |
| 100 if self.borderSize > 0: | |
| 101 for bx in (-1,0,1): | |
| 102 for by in (-1,0,1): | |
| 103 if bx and by: | |
| 104 draw.text((x + bx * self.borderSize, | |
| 105 y + by * self.borderSize), | |
| 106 self.text, font=font, fill=self.borderColor) | |
| 107 | |
| 108 # And the text itself... | |
| 109 draw.text((x,y), self.text, font=font, fill=self.textColor) | |
| 110 | |
| 111 ### The End ### |