raspi-zero-waveshare/simpilib/__init__.py

#!/usr/bin/env python3
# -*- coding:utf-8 -*-

def loadFontSize(text, draw, image, fontpath):
    from PIL import ImageFont
    fontsize = 1  # starting font size
    img_fraction = (1,1) # fraction of screen covered
    font = ImageFont.truetype(fontpath, fontsize)
    fsize = (0,0)
    imgsize = (0.9,0.9)
    longline = getLongLine(text.splitlines())
    while True:
        font_last = font
        fontsize += 1
        font = ImageFont.truetype(fontpath, fontsize)
        fsize = draw.textsize(text, font=font)
        imgsize = (img_fraction[0]*image.size[0], img_fraction[1]*image.size[1])

        if (fsize[0] > imgsize[0] or fsize[1] > imgsize[1]):
                break
        print("Fontsize:", fontsize, fsize, imgsize)
    return font_last


def wrapText(text):
    import textwrap
    splittext = []
    longline = ""
    iter_width = 500
    line_width_factor = 5
    while len(splittext)*line_width_factor < iter_width:
        iter_width -= 1
        splittext = textwrap.wrap(text, width=iter_width)
        longline = getLongLine(splittext)
        print("Wrap:", iter_width, len(splittext))
    return "\n".join(splittext), longline


def getLongLine(split):
    longline = ""
    for l in split:
        if len(l) > len(longline):
            longline = l
    return longline