使用PIL将文本绘制到图像的中心

Question

I have a few stings I would like to draw to imagea. the thing is that I want each string to be displayed in the middle of each image. how do I do it? or how can I know the length in pixels of a string (giving ofcourse the font)? thanks

Answer 1

You could find an implementation of this at http://tools.jedutils.com/tools/center-text-image

You could use that page for creating the image right there instead of implementing the routine yourself but the code is included on the page too.

Following Nicole's advise

from PIL import Image, ImageDraw, ImageFont, ImageFilter
import StringIO

filter_dict = {
    'BLUR' : ImageFilter.BLUR,
    'CONTOUR' : ImageFilter.CONTOUR,
    'DETAIL' : ImageFilter.DETAIL,
    'EDGE_ENHANCE' : ImageFilter.EDGE_ENHANCE,
    'EDGE_ENHANCE_MORE' : ImageFilter.EDGE_ENHANCE_MORE,
    'EMBOSS' : ImageFilter.EMBOSS,
    'FIND_EDGES' : ImageFilter.FIND_EDGES,
    'SMOOTH' : ImageFilter.SMOOTH,
    'SMOOTH_MORE' : ImageFilter.SMOOTH_MORE,
    'SHARPEN' : ImageFilter.SHARPEN
}

def get_font_full_path(font_path,font_name):
    ext = '.TTF' if font_name.upper() == font_name else ".ttf"
    return font_path + font_name + ext

def create_image(font_name, font_size, font_color, width, height, back_ground_color, text, img_type="JPEG", image_filter=None):
    font_full_path = get_font_full_path(font_path,font_name)
    font  =  ImageFont.truetype ( font_full_path, font_size )

    im  =  Image.new ( "RGB", (width,height), back_ground_color )
    draw  =  ImageDraw.Draw ( im )
    text_x, text_y = font.getsize(text)
    x = (width - text_x)/2
    y = (height - text_y)/2
    draw.text ( (x,y), text, font=font, fill=font_color )

    if image_filter:
        real_filter = filter_dict[image_filter]
        im = im.filter(real_filter)
    im.save ( "sample.jpg", format=img_type )

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Answer 2

PIL font's do have a getsize method which you can use to get width and height of font, did you try that? eg

from PIL import Image, ImageDraw, ImageFont

fontFile = "/usr/share/fonts/truetype/freefont/FreeSansBold.ttf"
font = ImageFont.truetype(fontFile, 10)
text="anurag"
print font.getsize(text)
assert font.getsize(text)[0]*2 == font.getsize(text*2)[0]