LUA和Corona错误:尝试调用方法'';(零值)-让我发疯
我想请你帮我一个让我发疯的错误 哦。。。我正在使用LUA和Corona SDK顺便说一句 我正在创建一个船的实例。船正在被实例化,我可以访问它的属性,但我不能访问任何方法!!按照代码操作,我不知道该怎么办: spaceShip.lua:LUA和Corona错误:尝试调用方法'';(零值)-让我发疯,lua,coronasdk,Lua,Coronasdk,我想请你帮我一个让我发疯的错误 哦。。。我正在使用LUA和Corona SDK顺便说一句 我正在创建一个船的实例。船正在被实例化,我可以访问它的属性,但我不能访问任何方法!!按照代码操作,我不知道该怎么办: spaceShip.lua: require('gameConf') spaceShip = {} spaceShip.__index = spaceShip function spaceShip:New(posX, posY, width, height) local _spa
require('gameConf')
spaceShip = {}
spaceShip.__index = spaceShip
function spaceShip:New(posX, posY, width, height)
local _spaceShip = nil
_spaceShip = {}
setmetatable(_spaceShip, spaceShip)
_spaceShip = display.newRect(posX - width/2, posY - height/2, width, height)
_spaceShip:setFillColor(140, 140, 140, 0)
_spaceShip.width = width
_spaceShip.height = height
local shipShape = { -width/2, -height/2, width/2, -height/2, width/2, height/2, -width/2, height/2 }
local shipShapeMaterial = { density = 1.0, friction = 1.0, bounce = 0.0 , shape = shipShape}
local shipMotor = { -width/2, height/3, width/2, height/3, width/2, height/2, -width/2, height/2 }
local shipMotorMaterial = { density = 1.0, friction = 1.0, bounce = 0.0 , shape = shipMotor}
physics.addBody( _spaceShip, shipShapeMaterial, shipMotorMaterial )
return _spaceShip
end
function spaceShip:log()
print("ship")
end
function spaceShip:applyFrontImpulse()
local angle = math.rad(self.rotation)
local xComp, yComp = math.cos(angle), -math.sin(angle)
local forceMag = 2
self:applyLinearImpulse(forceMag * xComp, forceMag * yComp, self.x, self.y)
end
和部分main.lua
require('camera')
require('gameConf')
require('meteor')
require('spaceShip')
-- Add Physics
local physics = require( "physics" )
physics.start()
physics.setDrawMode( "hybrid" )
physics.setGravity( 0, 0 )
-- Load camera
local camera = camera:New()
-- Containers
meteorManager = {}
shipManager = {}
-- Load Vector class
vector = require "vector"
-- Create one ship
local myShip = nil;
myShip = {}
myShip = spaceShip:New(600, 200, 30, 60)
table.insert(shipManager, myShip)
camera:insert(myShip)
myShip:log() <----- HERE IS THE ERROR
rest of the code...
我怀疑问题是由于以下片段:
_spaceShip = {}
setmetatable(_spaceShip, spaceShip)
_spaceShip = display.newRect(posX - width/2, posY - height/2, width, height)
您在\u spaceShip
上设置了一个元表,但随后为其指定了一个新值。此时,您指定的新值没有您建立的元表关联,因为它位于值(非变量)上
在
\u spaceShip=display.newRect…之后移动setmetatable
是!你是对的!我用显示过度定义了我的元表。。。为了更正,我创建了一个display spaceShip.body=。。。现在它成功了!!非常感谢。你能帮忙吗?
_spaceShip = {}
setmetatable(_spaceShip, spaceShip)
_spaceShip = display.newRect(posX - width/2, posY - height/2, width, height)