Measuring text width per given height and string

[HYUNSEONG-KIM]

Text width measuring

In writing texts in template pdf file, its precise dimension is required before applying to real pdf page.
Overlapping objects on result pdf could not be desired result for all situations.
Now its routine is only required by Note utils but further routines would require this feature.

Previous works

Using Pillow's text string method is popular on stackoverflow and the other sites.

• Help me

I implmented prototype version and tested it but pts and point conversion has an issue.

• How to get width of a truetype font character in 1200ths of an inch with python - dawid's answer.

from PIL import Image, ImageDraw, ImageFont
def get_text_dim(string, font_file: str, size):
    im_width = len(string) * size
    im_height = size
    bg_color = (0, 0, 0)

    # Generate string as image
    im = Image.new("RGB", (im_width, im_height), bg_color)
    draw = ImageDraw.Draw(im)
    font_PIL = ImageFont.truetype(font_file, size)
    draw.text((0, 0), string, font=font_PIL, fill=(255, 255, 255))
    bbox = im.getbbox()  # left, upper, right, and lower pixel coordinate

    width = bbox[2] + bbox[0]
    height = bbox[3] + int(bbox[1] / 2)
    return width, height

Others

• https://stackoverflow.com/questions/43828955/measuring-width-of-text-python-pil
• https://stackoverflow.com/questions/64660531/is-there-a-precise-way-to-measure-text-size-in-a-specific-font-in-python-3-7

Done

• Basic font routines are implemented:
  • Load system fonts
  • points <-> pixel conversion for general setting.

Remains

• Fonts routine wapper class implement compatible with fonttools library.
• Measuring dpi for reportlab pdfgen routine.
• Write width measuring based on reportlab routines.