【入门夯实】攻击校验：技能距离与冷却的服务器复核

local function onSkillCast(actor, skillId, targetX, targetY)
    local dmg = getSkillDamage(skillId)
    applyDamage(actor, targetX, targetY, dmg)
end

local SKILLS = { [1] = { name = "烈火剑法", cd = 8, range = 8, mpCost = 30 } }
local function onSkillCast(actor, skillId, targetX, targetY)
    actor = getplayerbyname(actor)
    local s = SKILLS[skillId]
    if s == nil then
        return false
    end
    local now = os.time()
    local lastCast = tonumber(getplayvar(actor, "HUMAN", "Cast_" .. skillId)) or 0
    if now - lastCast < s.cd then
        return false
    end
    local ax, ay = getActorPos(actor)
    local dx, dy = targetX - ax, targetY - ay
    if dx * dx + dy * dy > s.range * s.range then
        return false
    end
    local mp = tonumber(getplayvar(actor, "HUMAN", "MP")) or 0
    if mp < s.mpCost then
        return false
    end
    setplayvar(actor, "HUMAN", "Cast_" .. skillId, now, 1)
    setplayvar(actor, "HUMAN", "MP", mp - s.mpCost, 1)
    local dmg = getSkillDamage(skillId)
    applyDamage(actor, targetX, targetY, dmg)
    return true
end

local function inRange(ax, ay, bx, by, r)
    local dx, dy = bx - ax, by - ay
    return dx * dx + dy * dy <= r * r
end