# Vorschau der Ventilator-Kandidaten ohne Browser: Bezier-Segmente abtasten,
# rotieren, mit Pillow fuellen. Rechts jeweils die 22-px-Miniatur (Originalgroesse).
import math
from PIL import Image, ImageDraw

BG, FG, CASE = "#1d222a", "#e8804c", "#6f5344"


def bez(p0, p1, p2, p3, n=80):
    for i in range(n + 1):
        t = i / n
        u = 1 - t
        yield (u**3 * p0[0] + 3 * u * u * t * p1[0] + 3 * u * t * t * p2[0] + t**3 * p3[0],
               u**3 * p0[1] + 3 * u * u * t * p1[1] + 3 * u * t * t * p2[1] + t**3 * p3[1])


def outline(segs):
    pts = []
    for s in segs:
        pts.extend(bez(*s))
    return pts


def rot(p, deg, c=12.0):
    a = math.radians(deg)
    x, y = p[0] - c, p[1] - c
    return (c + x * math.cos(a) - y * math.sin(a), c + x * math.sin(a) + y * math.cos(a))


def draw(segs, blades, case_r, hub_r, size):
    S = size / 24
    img = Image.new("RGB", (size, size), BG)
    d = ImageDraw.Draw(img)
    if case_r:
        d.ellipse([(12 - case_r) * S, (12 - case_r) * S, (12 + case_r) * S, (12 + case_r) * S],
                  outline=CASE, width=max(1, int(1.4 * S)))
    pts = outline(segs)
    step = 360 / blades
    for i in range(blades):
        d.polygon([(x * S, y * S) for x, y in (rot(p, i * step) for p in pts)], fill=FG)
    d.ellipse([(12 - hub_r) * S, (12 - hub_r) * S, (12 + hub_r) * S, (12 + hub_r) * S],
              fill=BG, outline=FG, width=max(1, int(1.5 * S)))
    return img


CANDS = {
    "A_komma4": (4, [((12, 12), (11.4, 8.6), (11.4, 5.4), (12.7, 3.1)),
                     ((12.7, 3.1), (15.6, 4.2), (18.2, 6.6), (18.9, 9.4)),
                     ((18.9, 9.4), (17.2, 11.2), (14.6, 12), (12, 12))]),
    "B_schlank4": (4, [((12, 12), (10.6, 9), (10.4, 5.6), (12.2, 3.4)),
                       ((12.2, 3.4), (14.8, 4.6), (17.2, 7.2), (17.6, 10)),
                       ((17.6, 10), (16, 11.6), (13.8, 12.2), (12, 12))]),
    "C_breit3": (3, [((12, 12), (10.9, 8.4), (11.2, 4.8), (13.3, 2.9)),
                     ((13.3, 2.9), (16.6, 4.4), (18.8, 7.4), (19.2, 10.6)),
                     ((19.2, 10.6), (17, 12), (14.2, 12.4), (12, 12))]),
    "D_sichel5": (5, [((12, 12), (11.2, 9), (11.3, 5.8), (12.9, 3.6)),
                      ((12.9, 3.6), (15.1, 5), (16.9, 7.4), (17.3, 10.1)),
                      ((17.3, 10.1), (15.8, 11.4), (13.9, 12.1), (12, 12))]),
}

pad = 12
big, small = 200, 22
W = pad + len(CANDS) * (big + pad)
sheet = Image.new("RGB", (W, big + small + 3 * pad), BG)
dr = ImageDraw.Draw(sheet)
for i, (name, (blades, segs)) in enumerate(CANDS.items()):
    x = pad + i * (big + pad)
    sheet.paste(draw(segs, blades, 10.4, 2.1, big), (x, pad))
    sheet.paste(draw(segs, blades, 10.4, 2.1, small), (x + big // 2 - small // 2, big + 2 * pad))
    dr.text((x + 4, big + 2 * pad + small + 2), name, fill="#98a2b3")
sheet.save("fan_preview.png")
print("ok")