Y 速度在 8 和其他东西之间移动不一致？

Question

我最近在我的代码中添加了一个实体框架（差不多完成了一半），添加后我注意到播放器的 y 速度有问题，它似乎在 1 和 0 之间波动。我完全不知道为什么会这样已经发生了我认为这与我投入的当前物理学有关，但不确定发生了什么。代码如下：

Collisions.Lua

-- btw Not my Code just needed something to get AABB to work right
 function isColliding(a,b)
      if ((b.X >= a.X + a.Width) or
         (b.X + b.Width <= a.X) or
         (b.Y >= a.Y + a.Height) or
         (b.Y + b.Height <= a.Y)) then
           return false 
      else return true
           end
   end

-- 'A' Must Be an entity that Can Move 
-- 'B' Can Be a Static Object
-- Both need a Height, width, X and Y value
function IfColliding(a, b)

    if isColliding(a,b) then

        if a.Y + a.Height < b.Y then 
            a.Y = b.Y - a.Height
            a.YVel = 0
        elseif a.Y - a.Height > b.Y - b.Height then
            a.Y = b.Y + b.Height
            a.YVel = 0
        end

    end 

end

entitybase.lua

local entitybase = {}

lg = love.graphics

    -- Set Health
    entitybase.Health = 100

    -- Set Acceleration
    entitybase.Accel = 3000

    -- Set Y velocity
    entitybase.Yvel = 0.0

    -- Set X velocity
    entitybase.Xvel = 0.0

    -- Set Y Position
    entitybase.Y = 0

    -- Set X Position
    entitybase.X = 0

    -- Set Height
    entitybase.Height = 64

    -- Set Width 
    entitybase.Width = 64

    -- Set Friction
    entitybase.Friction = 0

    -- Set Jump
    entitybase.Jump = 350

    -- Set Mass
    entitybase.Mass = 50 

    -- Set Detection Radius
    entitybase.Radius = 100

    -- Sets boolean value for if the player can jump
    entitybase.canJump = true

    -- Sets Image default
    entitybase.img = nil

------------------------------------------------
-- Some Physics To ensure that movement works --
------------------------------------------------

function entitybase.physics(dt)


    -- Sets the X position of the entities
    entitybase.X = entitybase.X + entitybase.Xvel * dt

    -- Sets the Y position of the entities
    entitybase.Y = entitybase.Y + entitybase.Yvel * dt

    -- Sets the Y Velocity  of the entities
    entitybase.Yvel = entitybase.Yvel + (gravity  * entitybase.Mass) * dt

    -- Sets the X Velocity of the entities
    entitybase.Xvel = entitybase.Xvel * (1 - math.min(dt * entitybase.Friction, 1))

end

-- Entity Jump feature
function entitybase:DoJump()

    -- if the entities y velocity = 0 then subtract the Yvel from Jump Value
    if entitybase.Yvel == 0 then
        entitybase.Yvel = entitybase.Yvel - entitybase.Jump
    end

end

-- Updates the Jump
function entitybase:JumpUpdate(dt)

    if entitybase.Yvel ~= 0 then
        entitybase.Y = entitybase.Y + entitybase.Yvel * dt 
        entitybase.Yvel = entitybase.Yvel - gravity * dt
    end

end

function entitybase:update(dt)

    entitybase:JumpUpdate(dt)
    entitybase.physics(dt)
    entitybase.move(dt)

end

return entitybase

抱歉，我不知道我需要展示什么，因为我不完全知道是什么造成了问题，我又看了一遍，它看起来可能与碰撞有关，不确定.无论如何，感谢那些想要解决我的问题的人，如果有什么需要解释或理解，我会尽力解决它。

Answer 1

Fix your timestep 并且不要使用 dt 进行物理计算。