尝试在不同的lua文件中调用函数时出错(函数是零值)

时间:2014-03-09 05:39:59

标签: oop function lua

当我尝试在我试图制作的盒式对撞机对象中使用调用函数时,我收到以下错误。

错误:

main.lua:26:尝试调用字段'Update'(零值)

回溯

main.lua:26:在函数'update'中 [C]:在函数'xpcall'

守则:

main.lua

require("BoxCollider")

local s1 = {}
s1.x = 10
s1.y = 10
s1.w = 10
s1.h = 10
s1.collider = BoxCollider.new(s1.x,s1.y,s1.w,s1.h)

test = BoxCollider.new(40, 7,15,15)

function love.load()

end

function love.update(dt)

if love.keyboard.isDown("d") then s1.x = s1.x + 100 * dt end    
---[[   
s1.collider:Update(s1.x,s1.y)

if s1.collider:CheckCollisions(test) then
    s1.x = 10
end
--]]
end

function love.draw()

love.graphics.rectangle("fill", s1.x, s1.y, s1.w, s1.h)
love.graphics.rectangle("fill", 40, 7, 15,15)

end

BoxCollider.lua

BoxCollider = {}
BoxCollider._index = BoxCollider


--x is the x point of the collider, should be equal to the object's x point if the box        is for an object
--y is the y point of the collider, should be equal to the object's x point if the box is for an object
--w is the width of the box
--h is the height of the box

function BoxCollider.new(x,y,w,h)
return setmetatable({x = x or 0, y = y or 0, w = w or 0, h = h or 0},BoxCollider)
end

function BoxCollider:CheckCollisions( v )

return self.x < (v.x + v.h) and  v.x < (self.x + self.w) and self.y  < (v.y+v.h) and v.y < (self.y+self.h)  

end

function BoxCollider:reSize(nw,nh)
self.w = nw
self.h = nh

end

function BoxCollider:Update(nx,ny)
self.x = nx
self.y = ny
end

1 个答案:

答案 0 :(得分:0)

我想你在BoxCollider .__索引中忘记了一个额外的下划线。只有一个下划线,._ index,在以下情况下不会搜索BoxCollider方法:调用Update并且找不到它。