lua嘗試索引全局「StaticBody」（一個布爾值）

Question

我試圖用lua中的對象實驗一下，所以我試圖製作一個StaticBody和一個碰撞和一個Hitbox對象，但是當我啓動它時吐出一個錯誤主要在該行我創建staticbody：「main.lua：4企圖指數全球‘staticBody’（一個布爾值）」

https://pastebin.com/UFnEcYcT 下面的代碼

--main.lua 
  
StaticBody = require"StaticBody" 
collision = require"collision" 
  
player = StaticBody.StaticBody:new(300, 200, 40, 30, "RECT", 2000, 5000, 8.9, 900, 900, 5) 
  
function love.load() 
    playerimg = love.graphics.newImage("player.png") 
    player:setSprite(playerimg, 1, 1, 0, 0) 
end 
  
function love.draw() 
    player:draw() 
end 
  
function love.update(d) 
  
    if love.keyboard.isDown("a") then 
        input = -1 
    end 
    if love.keyboard.isDown("d") then 
        input = 1 
    end 
    if not love.keyboard.isDown("a") and not love.keyboard.isDown("d") then 
        input = 0 
    end 
  
    player:update(d,input) 
end 
  
  
function love.keypressed(key, scancode, isrepeat) 
    if key == "space" then 
        player:jump(800) 
    end 
end 
  
----------------------------------------------------------------------------------------------------------------- 
--StaticBody.lua 
----------------------------------------------------------------------------------------------------------------- 
  
StaticBody = {x = 0, y = 0, w = 1, h = 1, speedx = 0, speedy = 0, maxxspd = 1, maxyspd = 1, collosionmode = "RECT", sprite = nil, scalex = 1, 
 scaley = 1, offsetx = 0, offsety = 0, acc = 1, decel = 1, grav = 1, velx = 0, colbox = nil, hitbox = nil, turningfriction = 2} 
  
collision = require"collision" 
  
function clamp(variable,vmin,vmax) 
    if variable < vmin then 
        variable = vmin 
    end 
    if variable > vmax then 
        variable = vmax 
    end 
end 
  
function StaticBody:new(x, y, w, h, colmode, acc, decel, grav, maxxspd, maxyspd, turningfriction) 
    setmetatable({},StaticBody) 
  
    self.x = x 
    self.y = y 
    self.w = w 
    self.h = h 
    self.hitbox = collision.hitbox:new(x,y,w,h,false) 
    self.colbox = collision.ColObjekt:new(colmode,self.hitbox) 
    self.acc = acc 
    self.decel = decel 
    self.grav = grav 
    self.maxxspd = maxxspd 
    self.maxyspd = maxyspd 
    self.speedx = 0 
    self.speedy = 0 
    self.turningfriction = turningfriction 
    self.velx = 0 
  
    return self 
end 
  
function StaticBody:setSprite(sprite, scalex, scaley, offsetx, offsety) 
    self.sprite = sprite 
    self.scalex = scalex 
    self.scaley = scaley 
    self.offsetx = offsetx 
    self.offsety = offsety 
end 
  
function StaticBody:draw() 
    love.graphics.draw(self.sprite,self.x,self,y,0,self.scalex,self.scaley,self.offsetx,self.offsety,0,0) 
end 
  
function StaticBody:update(d,input) 
    local dir = 0 
    if input == -dir then 
        self.speedx = self.speedx/self.turningfriction 
    end 
    if input then 
        dir = input 
    end 
    if not self.colbox:getOnGround() then 
        self.speedy = self.speedy + self.grav * d 
    end 
  
    if input ~= 0 then 
        self.speedx = self.speedx + self.acc * d 
    else 
        self.speedx = self.speedx - self.decel * d 
    end 
  
    clamp(self.speedx,0,self.maxxspd) 
    clamp(self.speedy,0,self.maxyspd) 
  
    self.velx = self.speedx * d * dir 
    self.y = self.y + self.speedy * d 
    self.x = self.x + self.speedx * d * dir 
end 
  
function StaticBody:jump(jumpforce) 
    self.speedy = -jumpforce 
end 
  
------------------------------------------------------------------------------------------------ 
--collision.lua 
------------------------------------------------------------------------------------------------ 
  
ColObjekts = {} 
ColObjekt = {mode, x, y, w, h, collisionObjekts = ColObjekts} 
--Constructer 
function ColObjekt:new(mode,x,y,w,h,collisionObjekts) 
    setmetatable({},ColObjekt) 
  
    self.mode = mode 
    self.collisionObjekts = collisionObjekts 
    self.x = x 
    self.y = y 
    self.w = w 
    self.h = h 
    ColObjekts.push(self) 
  
    return self 
end 
  
--Constructer with Hitbbox 
function ColObjekt:new(mode,Hb,collisionObjekts) 
    setmetatable({},ColObjekt) 
  
    self.mode = mode 
    self.collisionObjekts = collisionObjekts 
    self.x = Hb.x 
    self.y = Hb.y 
    self.w = Hb.w 
    self.h = Hb.h 
end 
  
function ColObjekt:setcolObjekts(colobs) 
    self.collisionObjekts = colobs 
end 
  
function ColObjekt:getColliding() 
    for key,i in pairs(self.collisionObjekts) do 
        if getCollidingWith(self,i) then 
            return true 
    end 
    return false 
end 
end 
  
function ColObjekt:getCollidingWhich() 
    for key,i in pairs(self.collisionObjekts) do 
        if getCollidingWith(self,i) then 
            return true, i 
    end 
    return false 
end 
end 
  
function ColObjekt:getCollidingDir(Colob1,Colob2) 
    if not getCollidingWith(Colob1,Colob2) then 
        return false 
    elseif Colob1.y > Colob2.y then return "ONTOP" 
    elseif Colob1.x < Colob2.x and Colob1.y > Colob2.y+Colob2.h then return "LEFT" 
    elseif Colob1.x > Colob2.x and Colob1.y > Colob2.y+Colob2.h then return "RIGHT" 
    else return "UNDER" 
    end 
end 
  
function ColObjekt:getOnGround() 
    if self:getCollidingDir(self,self:getCollidingWhich()) == "ONTOP" then 
        return true 
    else 
        return false 
end 
  
function getCollidingWith(Colob1,Colob2) 
    --if Colob1 == Rectangle 
    if Colob1.mode == "RECT" then 
        if Colob2.mode == "RECT" then 
            ColRect_Rect(Colob1,Colob2) 
        end 
        if Colob2.mode == "CIRCLE" then 
            ColRect_Circle(Colob2,Colob1) 
        end 
    end 
  
    --if Colob1 == Circle 
    if Colob1.mode == "CIRCLE" then 
        if Colob2.mode == "CIRCLE" then 
            ColCircle_Circle(Colob1,Colob2) 
        end 
        if Colob2.mode == "RECT" then 
            ColRect_Circle(Colob1,Colob2) 
        end 
    end 
end 
  
function ColRect_Edges(c,r) 
    --OBEN 
    if  c.x > r.x and c.x < r.x + r.w 
    and c.y > r.y - c.h and c.y < r.y then return true 
    --UNTEN 
    elseif c.x > r.x and c.x < r.x + r.w 
    and c.y > r.y + r.h - c.h and c.y < r.y + r.h then return true   
    --LINKS 
    elseif  c.y > r.y and c.y < r.y + r.h 
    and     c.x > r.x - c.w and c.x < r.x then return true 
    --RECHTS 
    elseif c.y > r.y and c.y < r.y + r.h 
    and    c.x > r.x + r.w - c.w and c.x < r.x + r.w then return true 
    --WENN NICHTS ZUTRIFFT 
    else return false end   
end 
  
function ColRect_Corners(c,r) 
    if math.sqrt((c.x - r.x * c.x - r.x) + (c.y - r.y *  c.y - r.y)) < c.w/2 then 
        return true 
    elseif math.sqrt((c.x - (r.x + r.w) * c.x - (r.x + r.w)) + (c.y - r.y *  c.y - r.y)) < c.w/2 then 
        return true 
    elseif math.sqrt((c.x - (r.x + r.w) * c.x - (r.x + r.w)) + (c.y - (r.y + r.h) *  c.y - (r.y + r.h))) < c.w/2 then 
        return true 
    elseif math.sqrt((c.x - r.x * c.x - r.x) + (c.y - (r.y + r.h) *  c.y - (r.y + r.h))) then 
        return true 
    else 
        return false 
    end 
end 
  
function ColRect_Rect(r1,r2) 
    if r1.x < r2.x + r2.w and r1.x > r2.x - r1.x and r1.y > r2.y - r1.h and r1.y < r2.y + r2.h then 
        return true 
    end 
    return false 
end 
  
function ColCircle_Circle(c1,c2) 
    local scndx = c1.x - c2.x 
    local scndy = c1.y - c2.y 
    if math.sqrt((scndx * scndx) + (scndy *  scndy)) < c1.w/2 + c2.w/2 then 
        return true 
    end 
    return false 
end 
  
function ColRect_Circle(c,r) 
    if c.x > r.x and c.x < r.x + r.w 
    and c.y > r.y and c.y < r.y + r.h then 
        return true 
    end 
    if ColRect_Corners(c,r) then 
        return true 
    end 
    if ColRect_Edges(c,r) then 
        return true 
    end 
    return false 
end 
  
  
  
Hitbox = {x,y,w,h,show = false} 
function Hitbox:new(x,y,w,h,show) 
    setmetatable({},Hitbox) 
  
    self.x = x 
    self.y = y 
    self.w = w 
    self.h = h 
    self.show = show 
  
    return self 
end 
  
function Hitbox:update() 
    if self.show then 
    love.graphics.Rectangle("fill",self.x,self.y,self.w,self.h) 
    end 
end 
  
function Hitbox:setVisible(b) 
    self.show = b 
end 
  
end 

Answer 1

當你require在一個模塊Lua，交給你的價值是模塊最後的return。在沒有這樣的返回語句的情況下，Lua似乎隱式返回布爾值（true或false）。

您需要return StaticBody在StaticBody.lua的末尾。每個其他模塊都與您的項目接口相同。

請參閱this文章的詳細信息。

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由於@nobody提到了評論，你也可以決定什麼被分配到package.loaded表自己出口。

package.loaded.StaticBody = StaticBody