河灯寄愿：顺水漂走的思念

fx-riverlamp

local RiverLamp = {}
local lamps = {}

function RL.Release()
    lamps[#lamps + 1] = {
        x = 40,
        y = 120 + math.random() * 90,
        ph = math.random() * 6.28
    }
    SL:SetValue("released", SL:GetValue("released") + 1)
end

function RL.Tick(dt)
    local flow = SL:GetValue("flowSpeed") or 50
    for i = #lamps, 1, -1 do
        local L = lamps[i]
        L.x = L.x + flow * dt
        L.ph = L.ph + dt
        -- 纵向浮沉跟水波: 同一片水同一个节奏
        L.y = L.y + math.sin(L.ph * 1.6) * 8 * dt
        SL:SetFxPos("lamp" .. i, L.x, L.y)
        -- 水面倒影: 光晕垂直镜像
        SL:DrawGlow(L.x, L.y + 14, 24, "warm_mirror", 0.3)
        -- 漂出画面: 淡出移除
        if L.x > SL:GetValue("width") + 30 then
            table.remove(lamps, i)
        end
    end
end

-- 水波底纹: 三层正弦错相滚动
function RL.Water(dt)
    SL:SetValue("waterPhase", (SL:GetValue("waterPhase") or 0) + dt)
    for w = 1, 6 do
        SL:DrawWaveLine(w, SL:GetValue("waterPhase") * 2 + w)
    end
end

return RiverLamp