冰刺地阵：脚下冒出冰凌子

 fx-icespike2

local IceSpikes = {}
local KEY = { GROW_SPD = 120 }

local spikes = {}

function IS.Spawn(cx, count)
    spikes = {}
    for i = 1, count do
        spikes[#spikes + 1] = {
            x = cx - 30 + i * 14,
            h = 0,
            max = 30 + math.random() * 16,
            delay = i * 0.12
        }
    end
end

function IS.Tick(dt)
    local anyGrowing = false
    for _, s in ipairs(spikes) do
        if s.delay > 0 then
            s.delay = s.delay - dt
            anyGrowing = true
        elseif s.h < s.max then
            s.h = math.min(s.max, s.h + KEY.GROW_SPD * dt)
            anyGrowing = true
            -- 冰凌冒出时闪光
            if math.random() < dt * 8 then
                SL:PlayBurst(s.x, SL:GetValue("groundY") - s.h, "ice_spark", 2)
            end
        end
    end
    -- 全部长齐: 碎裂
    local allGrown = true
    for _, s in ipairs(spikes) do
        if s.h < s.max then allGrown = false; break end
    end
    if allGrown and #spikes > 0 then
        SL:ScheduleOnce(function()
            IS.Shatter()
        end, 0.8)
    end
end

function IS.Shatter()
    for _, s in ipairs(spikes) do
        SL:PlayBurst(s.x, SL:GetValue("groundY") - s.h / 2,
                     "ice_shatter", 5)
    end
    SL:PlaySfx("ice_break")
    SL:ScreenShake(0.22, 3)
    spikes = {}
    SL:ShowSystemTips("冰刺碎裂!")
end

return IS