投壶：壶口会动的才叫准

fx-toup

local TouHu = {}
local KEY = { POT_HALF = 24, GRAVITY = 380 }

local arrows = {}

function TH.Throw(power)
    arrows[#arrows + 1] = {
        x = 100, y = SL:GetValue("height") - 70,
        vx = power, vy = -300,
        scored = false, stuck = false
    }
    SL:PlayActorAct("player", "throw")
end

function TH.Tick(dt)
    local potX = SL:GetValue("potX")
    local rimY = SL:GetValue("potY") + 10
    for i = #arrows, 1, -1 do
        local a = arrows[i]
        if a.stuck then
            -- 插稳的箭: 尾巴颤两下定格
            a.wob = math.max(0, (a.wob or 0.3) - dt)
            SL:SetActorRotate("arrow" .. i, math.sin(a.wob * 40) * 0.06 * a.wob * 3)
        else
            a.vy = a.vy + KEY.GRAVITY * dt
            local prevY = a.y
            a.x = a.x + a.vx * dt
            a.y = a.y + a.vy * dt
            a.rot = math.atan2(a.vy, a.vx)
            -- 下行穿越壶口平面 + 横向在口内
            if a.vy > 0 and prevY <= rimY and a.y > rimY
               and math.abs(a.x - potX) < KEY.POT_HALF - 4 then
                a.scored = true
                a.stuck = true
                a.stickX = a.x
                a.vy = 0
                SL:PlaySfx("pot_in")
                SL:PlayBurst(potX, rimY, "gold", 8)
                SL:SetValue("hits", SL:GetValue("hits") + 1)
                SL:ShowTipAbove(potX, rimY - 30, "中壶!")
            end
        end
    end
end

return TH