【进阶实战】飞爪钩锁：远程位移的落点校验封装

local RANGE = 12
-- walkable 为项目已有的落点可站立校验
local function hookOk(actor, tx, ty, walkable)
    local cx = tonumber(getplayvar(actor, 0, "X")) or 0
    local cy = tonumber(getplayvar(actor, 0, "Y")) or 0
    local dist = math.sqrt((tx - cx) ^ 2 + (ty - cy) ^ 2)
    if dist > RANGE then
        sendmsg(actor, 1, "超出钩锁射程 12 格。")
        return false
    end
    if not walkable(tx, ty) then
        sendmsg(actor, 1, "落点无法立足，钩锁收回。")
        return false
    end
    return true, dist
end

local function throwHook(actor, tx, ty, walkable)
    local ok, dist = hookOk(actor, tx, ty, walkable)
    if not ok then
        return
    end
    setplayvar(actor, 0, "X", tx, 0)
    setplayvar(actor, 0, "Y", ty, 0)
    sendmsg(actor, 1, "钩锁拉拽，位移 " .. math.floor(dist) .. " 格。")
end