我需要限制图像移动LOVE2D。

我正在使用Love2d和Lua制作游戏。目前，我有一个人物，可以从左到右“滑动”。我想要限制他的移动，以便他不会掉出屏幕。我尝试使用if语句检测他的X是否大于800（因为我的窗口大小为800x600），但它最终会导致出现故障...这是代码。请帮帮我？

```function love.load() love.graphics.setBackgroundColor(92,217,255) person={} person.image=love.graphics.newImage('/sprites/spriteTest.png') person.x=400 person.y=303 person.speed=200 hills=love.graphics.newImage('/sprites/spriteHills.png') end function love.update(dt)

if (person.x>735) then

if (love.keyboard.isDown('right') or love.keyboard.isDown('d')) then
    if (love.keyboard.isDown('left') or love.keyboard.isDown('a')) then
        person.x=person.x+(person.speed*dt)
    else
        person.x=person.x
    end

elseif (love.keyboard.isDown('left') or love.keyboard.isDown('a')) then
    if (love.keyboard.isDown('right') or love.keyboard.isDown('d')) then
        person.x=person.x+(person.speed*dt)
    else
        person.x=person.x
    end

end

elseif (person.x<0) then

if (love.keyboard.isDown('right') or love.keyboard.isDown('d')) then
    if (love.keyboard.isDown('left') or love.keyboard.isDown('a')) then
        person.x=person.x+(person.speed*dt)
    else
        person.x=person.x
    end

elseif (love.keyboard.isDown('left') or love.keyboard.isDown('a')) then
    if (love.keyboard.isDown('right') or love.keyboard.isDown('d')) then
        person.x=person.x+(person.speed*dt)
    else
        person.x=person.x
    end

end

else

if (love.keyboard.isDown('right') or love.keyboard.isDown('d')) then
    person.x=person.x+(person.speed*dt)
elseif (love.keyboard.isDown('left') or love.keyboard.isDown('a')) then
    person.x=person.x-(person.speed*dt)
end

end

end function love.draw() love.graphics.draw(hills, 0, 0) love.graphics.draw(person.image, person.x, person.y) end```