【Lua实战】半月弯刀范围：范围伤害的扇形判定实现细节

local RANGE, ARC = 3, 60
local function inArc(ax, ay, facing, tx, ty)
    local dx, dy = tx - ax, ty - ay
    local dist = math.sqrt(dx * dx + dy * dy)
    if dist > RANGE or dist == 0 then
        return false
    end
    local ang = math.deg(math.atan2(dy, dx))
    local diff = math.abs(((ang - facing + 180) % 360) - 180)
    return diff <= ARC / 2
end

local function sweepAttack(actor, px, py, facing)
    local player = class(actor)
    local hit = 0
    for _, tname in ipairs(nearbyEnemies(actor)) do
        local t = getplayerbyname(tname)
        if t ~= nil and isplayer(t) and inArc(px, py, facing, 3, 3) then
            humanhp(t, "-", 120)
            hit = hit + 1
            if hit >= 8 then break end
        end
    end
    sendmsg(actor, 0, "半月弯刀命中" .. hit .. "个目标")
end