火墙三格：烧在地上赶不走的霸道

fx-firewall

local firewall = {}
local CELL_W = 46
local BURN_TICK = 0.5

function firewall:Cast(caster, cells)
    local dirSign = caster:GetFaceSign()
    local origin = { x = caster:GetX() + dirSign * 190, y = caster:GetY() }
    self._cells = {}
    for i = 0, cells - 1 do
        local cx = origin.x + (i - (cells - 1) / 2) * CELL_W
        self._cells[#self._cells + 1] = {
            x = cx, phase = math.random() * 7,
            burnAcc = 0,
            fx = CreateFlameCell(cx, caster:GetY())   -- 独立火苗+独立相位
        }
    end
    self._life = 12
    PlaySound(SND_FIREWALL)
end

function firewall:Update(dt)
    self._life = self._life - dt
    if self._life <= 0 then self:Dieout(); return end

    for _, cell in ipairs(self._cells) do
        local m = scene:GetMainMonster()
        if m and math.abs(m:GetX() - cell.x) < CELL_W * 0.55 then
            m:SlowDown(0.6)                            -- 入火减速
            cell.burnAcc = cell.burnAcc + dt
            if cell.burnAcc >= BURN_TICK then          -- 每格独立节拍
                cell.burnAcc = 0
                m:OnHit(9)
                m:PlayHurt()
            end
        else
            cell.burnAcc = 0                           -- 离格清零, 回来重计
        end
    end
end