opencv automated fontsize

auto_font_size.py

import cv2

def get_font_point_and_scale(text, x, y, h, w, thickness, font):

    (text_width, text_height) = cv2.getTextSize(text, font, 1.0, thickness)[0]
    scalex = w/text_width
    scaley = h/text_height
    scale = min(scalex, scaley)
    marginx = 0 if scale == scalex else int(w *(scalex-scale)/scalex*0.5)
    marginy = 0 if scale == scaley else int(h *(scaley-scale)/scaley*0.5)

    return (x+marginx, y+h-marginy), scale