PIL word wrap

gistfile1.py

# http://tanner-tech.googlecode.com/svn-history/r197/trunk/NewWorldMap/cardgen/eniCards.py

import Image, ImageDraw, ImageFont

# load an existing image
photo = Image.open("lyn.jpg")
photoSize = photo.size

# create a new, empty image
card = Image.new('RGB', (600, 600), color=(255,255,255))

# paste photo at some point
card.paste(photo, (30,30))

# draw lines around the photo
draw = ImageDraw.Draw(card)
draw.line((25,25, photoSize[0]+35, 25), fill=(255,0,0), width=2)
draw.line((25,photoSize[1]+35, photoSize[0]+35, photoSize[1]+35), fill=(255,0,0), width=2)


# This function comes from the web:
# http://jesselegg.com/archives/2009/09/5/simple-word-wrap-algorithm-pythons-pil/

def draw_word_wrap(draw, text,
                   xpos=0, ypos=0,
                   max_width=130,
                   fill=(250,0,0),
                   font=ImageFont.truetype("arial.ttf", 50)):
    '''Draw the given ``text`` to the x and y position of the image, using
    the minimum length word-wrapping algorithm to restrict the text to
    a pixel width of ``max_width.``
    '''
    text_size_x, text_size_y = draw.textsize(text, font=font)
    remaining = max_width
    space_width, space_height = draw.textsize(' ', font=font)
    # use this list as a stack, push/popping each line
    output_text = []
    # split on whitespace...    
    for word in text.split(None):
        word_width, word_height = draw.textsize(word, font=font)
        if word_width + space_width > remaining:
            output_text.append(word)
            remaining = max_width - word_width
        else:
            if not output_text:
                output_text.append(word)
            else:
                output = output_text.pop()
                output += ' %s' % word
                output_text.append(output)
            remaining = remaining - (word_width + space_width)
    for text in output_text:
        draw.text((xpos, ypos), text, font=font, fill=fill)
        ypos += text_size_y

# draw text

draw_word_wrap(draw,
               "This is the title of my presentation. What happens after this?",
               30+photoSize[0]+30,
               30,
               200)

text = '''Let's have some more text here that will be about the abstract, \
I am sure that this can go as long as I want it to be. More, more, more...'''

draw_word_wrap(draw, text,
               30, 30+photoSize[1]+30,
               max_width = 250,
               fill=(0,0,255),
               font= ImageFont.truetype("arial.ttf", 20))
card.show()
card.save('card.png')