class Bild:
    def __init__(self,w,h):
        self.w = w
        self.h = h
        self.pixels = [[[0,0,0] for y in range(self.h)] for x in range(self.w)]

    # Siehe https://de.wikipedia.org/wiki/Portable_Anymap
    def save(self, datei):
        with open(datei, "w") as f:
            f.write("P3\n# Siehe https://de.wikipedia.org/wiki/Portable_Anymap\n")
            f.write("%d %d\n255\n" % (self.w, self.h))
            for y in range(self.h):
                for x in range(self.w):
                    w = [int(v) for v in self.pixels[x][y]]
                    w = [v for v in w if v>=0 and v<256]
                    if len(w)!=3:
                        raise RuntimeError(f"Farbe bei pixel[{x}][{y}] falsch: {self.pixels[x][y]}")
                    f.write("%d %d %d\n" % tuple(w))


# adpted from https://stackoverflow.com/questions/24852345/hsv-to-rgb-color-conversion
def hsv_to_rgb(h, s, v):
    if s:
        if h == 1.0: h = 0.0
        i = int(h*6.0); f = h*6.0 - i
        
        w = int(255*( v * (1.0 - s) ))
        q = int(255*( v * (1.0 - s * f) ))
        t = int(255*( v * (1.0 - s * (1.0 - f)) ))
        v = int(255*v)
        
        if i==0: return (v, t, w)
        if i==1: return (q, v, w)
        if i==2: return (w, v, t)
        if i==3: return (w, q, v)
        if i==4: return (t, w, v)
        if i==5: return (v, w, q)
    else: v = int(255*v); return (v, v, v)