gadget-kspconsole/gentable-atan2.py

import math

# Size of the LUT
SIZE = 81

# Center of the circle
CX = 40
CY = 40

# Generate LUT
lut = [[0 for _ in range(SIZE)] for _ in range(SIZE)]

for i in range(SIZE):
    for j in range(SIZE):
        x = i - CX
        y = j - CY
        angle = int(math.degrees(math.atan2(y, x)) * 256 / 360)
        if angle < 0:
            angle += 256
        lut[i][j] = angle

# Output C code
print("const int16_t atan2_lut[{}][{}] = {{".format(SIZE, SIZE))
for i in range(SIZE):
    print("    {", end="")
    for j in range(SIZE):
        print("{:5},".format(lut[i][j]), end="")
        if j % 10 == 9:
            print()
            print("     ", end="")
    print("},")
print("};")