藏在草里的雷：踩上去才知道

fx-trap

local trapEntity = {}

function trapEntity:Init(x, y)
    self._x, self._y = x, y
    self._state = "armed"
    self._grass = CreateGrassDecal(x, y)            -- 伪装: 草丛贴图盖住
    self._grass:AddToLayer(GROUND_LAYER)
end

function trapEntity:Update(dt)
    if self._state == "armed" then
        local hero = scene:GetMainActor()
        if math.sqrt((hero:GetX() - self._x) ^ 2 + ((hero:GetY() - self._y) / 0.5) ^ 2) < 30 then
            self._state = "warning"
            self._warnT = 0
            self._warnRing = CreateWarnRing(self._x, self._y)   -- 预警圈急闪
        end
    elseif self._state == "warning" then
        self._warnT = self._warnT + dt
        self._warnRing:SetBlink(self._warnT)                    -- 明灭频率随时间加快
        if self._warnT >= 0.3 then
            self._state = "dead"
            self:Explode()
        end
    end
end

function trapEntity:Explode()
    SpawnBoom(self._x, self._y)                      -- 扩散环+扬尘(手绘)
    local hero = scene:GetMainActor()
    hero:ApplyDamage(self._dmg)
    hero:EnterStiff(0.45)                            -- 硬直: 被阴了要愣一下
    self._grass:removeFromParent()
    self._warnRing:removeFromParent()
end