老鹰捉小鸡：护住队尾那只

fx-eagle

local Eagle = {}
local KEY = { LINK = 34 }

local chicks = {}

function EG.Tick(dt)
    -- 母鸡横挡: 鹰在左侧就往左挡, 封堵横向通道
    local ex = SL:GetValue("actorX", "eagle")
    local hx = SL:GetValue("actorX", "hen")
    if math.abs(ex - hx) < 40 then
        SL:MoveActorX("hen", ex > hx and -90 * dt or 90 * dt)
    end
    -- 链式跟随: 每节小鸡追前一节, 间距不足自动甩出
    local prev = "hen"
    for _, c in ipairs(chicks) do
        if c.alive then
            local px, py = SL:GetValue("actorX", prev), SL:GetValue("actorY", prev)
            local cx, cy = SL:GetValue("actorX", c.id), SL:GetValue("actorY", c.id)
            local dx, dy = px - cx, py - cy
            local d = math.sqrt(dx * dx + dy * dy)
            if d > KEY.LINK then
                local k = (d - KEY.LINK) * 6 * dt
                SL:MoveActor(c.id, dx / d * k, dy / d * k)
            end
            prev = c.id
        end
    end
    -- 抓捕判定: 鹰爪与队尾的距离
    local tail = SL:GetValue("tailChick")
    if tail then
        local d = SL:GetValue("dist", "eagle", tail)
        if d < 22 then
            SL:SetValue("tailAlive", false)
            SL:SetValue("caught", SL:GetValue("caught") + 1)
            SL:PlayBurst(SL:GetValue("actorX", tail),
                         SL:GetValue("actorY", tail), "feather", 8)
            SL:ShowSystemTips("队尾被叼走了!")
            Eagle.Reset()
        end
    end
end

function Eagle.Reset()
    SL:ScheduleOnce(function()
        SL:SetValue("phase", "circle")
        SL:SetActorPos("eagle", 560, 90)
    end, 1.2)
end

return Eagle