"""Zoom crops of the user's blueprint with pixel rulers (sheet pixel coordinates), for reading by eye."""
import sys
from PIL import Image, ImageDraw
import os
SRC = os.environ.get('ZSRC', 'reference/user_blueprint.png')
def zoom(name, x0, y0, x1, y1, k=3, step=10):
    im = Image.open(SRC).crop((x0, y0, x1, y1)).resize(((x1-x0)*k, (y1-y0)*k), Image.LANCZOS)
    d = ImageDraw.Draw(im)
    for x in range((x0//step+1)*step, x1, step):
        X = (x-x0)*k; big = x % 50 == 0
        d.line([(X, 0), (X, 12 if big else 5)], fill=(255,255,0) if big else (200,200,0))
        if big: d.text((X+2, 12), str(x), fill=(255,255,0))
    for y in range((y0//step+1)*step, y1, step):
        Y = (y-y0)*k; big = y % 50 == 0
        d.line([(0, Y), (12 if big else 5, Y)], fill=(255,255,0) if big else (200,200,0))
        if big: d.text((14, Y+2), str(y), fill=(255,255,0))
    im.save(f'reference/z{k}_{name}.png')
if __name__ == '__main__':
    a = sys.argv[1:]
    zoom(a[0], *map(int, a[1:5]), k=int(a[5]) if len(a) > 5 else 3)