Y Velocity在8和其他東西之間移動不一致？

Question

我最近爲我的代碼添加了一個實體框架（完成了一半），並且在我添加它之後，我注意到玩家的y速度似乎在1和0之間波動，我完全被難住了。發生了我認爲這與我所投入的當前物理有關，但不知道發生了什麼。下面的代碼：

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 

對不起對於這一切，我不知道我裝卡需要什麼來證明，因爲我不知道完全造成這個問題的原因是什麼，我又看了一遍，它似乎是碰撞的事情，也許不確定。無論如何，謝謝那些想要解決我的問題的人，如果有什麼需要解釋或理解的話，我會盡我所能來清除它。

Answer 1

Fix your timestep並且不要將dt用於物理計算。