空投争夺：天上掉下来的箱子谁先到

fx-airdrop

local AirDrop = {}
local KEY = { ARRIVE = 8 }

local st = { phase = "idle", t = 0, box = nil }

local function MoveTo(u, tx, spd, dt)
    local dx = tx - SL:GetValue("actorX", u)
    if math.abs(dx) <= KEY.ARRIVE then
        SL:SetActorVelocity(u, 0, 0)
        SL:PlayActorAct(u, "idle")
        return true
    end
    SL:SetActorVelocity(u, dx > 0 and spd or -spd, 0)
    SL:PlayActorAct(u, "run")
    return false
end

function AirDrop.Call()
    if st.phase ~= "idle" then return end
    local bx = 220 + math.random() * 220
    st.box = { x = bx, y = -60, landed = false }
    st.phase = "descend"
    SL:PlayFxAt("plane_shadow", bx, 0)
    SL:Schedule(function(dt)
        local box = st.box
        if st.phase ~= "descend" then SL:UnSchedule("dropFall") return end
        local fall = SL:GetValue("fallSpeed") or 70
        box.y = box.y + fall * dt
        SL:SetFxPos("crate", box.x, box.y)
        if box.y >= SL:GetValue("groundY") - 14 then
            box.y = SL:GetValue("groundY") - 14
            SL:PlayFxAt("land_ring", box.x, box.y)
            SL:ScreenShake(0.16, 2)
            st.phase = "race"
            SL:UnSchedule("dropFall")
        end
    end, 0.016, "dropFall")
end

function AirDrop.Tick(dt)
    if st.phase ~= "race" or not st.box then return end
    local self_ = SL:GetValue("selfActor")
    local target = SL:GetValue("curTarget")
    local pArr = MoveTo(self_, st.box.x - 22, 96, dt)
    local mArr = MoveTo(target, st.box.x + 22, 88, dt)
    if pArr or mArr then
        st.phase = "end"
        if pArr then
            SL:PlayFxAt("crate_open_gold", st.box.x, st.box.y)
            SL:ShowSystemTips("先到开箱!")
        else
            SL:ShowTipAbove(target, "是我的了")
        end
        SL:ScheduleOnce(function() st.phase = "idle"; st.box = nil end, 2.2)
    end
end

return AirDrop