【高级技巧】圆周等距布点：环绕阵列的坐标生成封装

local function ringPoints(cx, cy, r, n, offsetDeg)
    local pts = {}
    local base = (offsetDeg or 0) * math.pi / 180
    for i = 0, n - 1 do
        local a = base + math.pi * 2 * i / n
        pts[#pts + 1] = {
            x = math.floor(cx + r * math.cos(a) + 0.5),
            y = math.floor(cy + r * math.sin(a) + 0.5)
        }
    end
    return pts
end

local function summonRing(mapId, cx, cy)
    local pts = ringPoints(cx, cy, 6, 8, 22)
    for _, p in ipairs(pts) do
        genmon(mapId, p.x, p.y, "护卫石像", 0, 1, 0)
    end
end