暴力摩托：油门拧到底别松手

SL:AttachToGround(bike, "wheel_front")

fx-moto

local Moto = {}
local KEY = { GRAVITY = 700, BASE = 180 }
local bike = { air = false, vy = 0, tilt = 0 }

local function GroundAt(x)
    return SL:GetValue("terrainY", x)
end

function Moto.Tick(dt)
    local spd = SL:GetValue("motoSpeed") or KEY.BASE
    SL:ScrollWorld(spd * dt)
    local x = SL:GetValue("actorX", "bike")
    local gF = GroundAt(x + 14)
    local gB = GroundAt(x - 14)
    if not bike.air then
        local gMid = (gF + gB) / 2
        -- 地形塌陷: 起飞
        if gMid > SL:GetValue("actorY", "bike") + 6 then
            bike.air = true
            bike.vy = 0
            SL:SendEvent("moto_takeoff")
        else
            SL:SetActorY("bike", gMid)
            -- 俯仰角: 前后轮高度差换算
            bike.tilt = math.atan((gF - gB) / 28)
            SL:SetActorRotate("bike", bike.tilt)
        end
    else
        bike.vy = bike.vy + KEY.GRAVITY * dt
        local ny = SL:GetValue("actorY", "bike") + bike.vy * dt
        local gMid = (gF + gB) / 2
        if ny >= gMid then
            SL:SetActorY("bike", gMid)
            bike.air = false
            bike.tilt = 0.3                       -- 悬挂压缩
            SL:PlayFxAt("dust", x, gMid + 4)
            SL:ScheduleOnce(function()
                SL:SetActorRotate("bike", 0)
            end, 0.1)
        else
            SL:SetActorY("bike", ny)
            bike.tilt = math.max(-0.5, bike.tilt - dt * 1.4)
            SL:SetActorRotate("bike", bike.tilt)
        end
    end
end

return Moto