龙息灼原：一口火吐出一条焦土

fx-breath

local DragonBreath = {}
local KEY = { BURN_TICK = 0.45 }

function Breath.Cast(self_, target, duration)
    SL:PlayActorAct(self_, "cast")
    SL:SetValue("breathing", true)
    local elapsed = 0
    local hitDone = false
    local burnTimer = 0
    SL:Schedule(function(dt)
        elapsed = elapsed + dt
        -- 火流常驻渲染: 起点在口部, 终点在目标
        SL:DrawConeFx("dragon_fire",
            SL:GetValue("actorX", self_) + 20,
            SL:GetValue("actorY", self_) - 56,
            SL:GetValue("actorX", target),
            SL:GetValue("actorY", target) - 56)
        -- 首次吞没: 一次大额结算
        if not hitDone and elapsed > 0.2 then
            hitDone = true
            SL:ScreenShake(0.26, 4)
            SL:DeductHp(target, 28)
            SL:ShowHitNum(target, 28, "breath_big")
            SL:PlayActorAct(target, "stuck")
        end
        -- 灼烧跳: 小额分段
        burnTimer = burnTimer + dt
        if burnTimer >= KEY.BURN_TICK then
            burnTimer = burnTimer - KEY.BURN_TICK
            SL:DeductHp(target, 8)
            SL:ShowHitNum(target, 8, "burn_small")
        end
        -- 地面焦土逐步生长
        SL:GrowGroundFx("scorched", SL:GetValue("actorX", self_),
                                       elapsed / duration)
        if elapsed >= duration then
            SL:UnSchedule("breathRun")
            SL:SetValue("breathing", false)
            SL:StopConeFx("dragon_fire")
        end
    end, 0.016, "breathRun")
end

return Breath