水枪打鸭：滋一下挪半寸

fx-watergun

local WaterGun = {}
local KEY = { DROP_T = 0.6 }

local ducks, drops = {}, {}

function WG.Shoot(press)
    -- 水柱: 一串带下坠弧度的水滴
    for i = 1, 12 do
        drops[#drops + 1] = {
            x = SL:GetValue("gunX"),
            y = SL:GetValue("gunY") - i * 4,
            vx = press * 3.2,
            vy = (math.random() - 0.5) * 40,
            t = 0
        }
    end
    -- 命中推鸭: 累积横向速度
    for _, d in ipairs(ducks) do
        if not d.falling
           and math.abs(d.x - SL:GetValue("duckZone")) < 130
           and d.y < SL:GetValue("height") - 60 then
            d.vx = d.vx + press * 0.16
            d.wob = d.wob + 1.2            -- 被滋得摇摇晃晃
        end
    end
    SL:PlaySfx("squirt")
end

function WG.Tick(dt)
    -- 水滴飞行: 微重力, 到时化水花
    for i = #drops, 1, -1 do
        local w = drops[i]
        w.t = w.t + dt
        w.vy = w.vy + 60 * dt
        w.x = w.x + w.vx * dt
        w.y = w.y + w.vy * dt
        if w.t > KEY.DROP_T or w.x > SL:GetValue("width") then
            SL:PlayFxAt("drop_splash", w.x, w.y)
            table.remove(drops, i)
        end
    end
    -- 鸭子被推出台沿: 落水计分
    for i = #ducks, 1, -1 do
        local d = ducks[i]
        if d.falling then
            d.fallT = d.fallT + dt
            d.y = d.y + 300 * d.fallT * dt
            d.x = d.x + d.vx * dt
            if d.y > SL:GetValue("height") - 40 then
                SL:SetValue("knocked", SL:GetValue("knocked") + 1)
                table.remove(ducks, i)
            end
        else
            d.vx = d.vx * (1 - dt)          -- 台面摩擦
            d.x = d.x + d.vx * dt
            if d.x > SL:GetValue("width") + 20 then table.remove(ducks, i) end
        end
    end
end

return WaterGun