幽冥鬼影：影子学你一步炸一步

fx-shadowghost

local ShadowGhost = {}
local KEY = { ALPHA = 0.75 }

local ghost = nil

function ShadowGhost.Summon(target, duration)
    ghost = {
        owner = target,
        off = -70,
        alpha = 0,
        born = SL:GetValue("engineTime")
    }
    SL:PlayFxAt("ghost_birth", SL:GetValue("actorX", target) - 70,
                                SL:GetValue("actorY", target))
    SL:Schedule(function(dt)
        if not ghost then SL:UnSchedule("ghostRun") return end
        local ox = SL:GetValue("actorX", target)
        local oy = SL:GetValue("actorY", target)
        -- 位移镜像: 影子始终在反侧
        local wantX = ox + ghost.off
        local gx = SL:GetValue("actorX", "ghost")
        SL:SetActorVelocity("ghost", (wantX - gx) * 6, 0)
        -- 动作帧同步: 直接读本体当前帧
        SL:SetActorAct("ghost", SL:GetValue("actorAct", target))
        SL:SetActorFrame("ghost", SL:GetValue("actorFrame", target))
        -- 透明度爬升
        ghost.alpha = math.min(KEY.ALPHA, ghost.alpha + dt * 2.5)
        SL:SetActorAlpha("ghost", math.floor(ghost.alpha * 255))
        -- 模仿时限: 反噬
        if SL:GetValue("engineTime") - ghost.born >= duration then
            ShadowGhost.Detonate(target)
        end
    end, 0.016, "ghostRun")
end

function ShadowGhost.Detonate(target)
    local ox = SL:GetValue("actorX", target)
    local oy = SL:GetValue("actorY", target)
    SL:PlayActorAct(target, "stuck")
    SL:PlayFxAt("ghost_burst", ox, oy)
    SL:ScreenShake(0.3, 5)
    SL:DeductHp(target, 38)
    SL:ShowHitNum(target, 38, "ghost")
    SL:PlayFxAt("ghost_fade", SL:GetValue("actorX", "ghost"),
                              SL:GetValue("actorY", "ghost"))
    SL:RemoveActor("ghost")
    ghost = nil
end

return ShadowGhost