Hello everybody! I would ask your help for an error that is driving me crazy.
I am creating an instance of a ship. She is being instantiated, I can access its properties, but I can not access any method!! Follow the codes, I do not know what to do:
spaceShip.lua:
[lua]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[/lua]
main.lua
[lua]require(‘camera’)
require(‘gameConf’)
require(‘meteor’)
require(‘spaceShip’)
– Adiciona a física
local physics = require( “physics” )
physics.start()
physics.setDrawMode( “hybrid” )
physics.setGravity( 0, 0 )
– Carrega a camera
local camera = camera:New()
– Containers
meteorManager = {}
shipManager = {}
– Requisita a classe Vector
vector = require “vector”
– Adiciona uma nave
local myShip = nil;
myShip = {}
myShip = spaceShip:New(600, 200, 30, 60)
table.insert(shipManager, myShip)
camera:insert(myShip)
myShip:log() – ERROR HERE!!!
Rest of the code…[/lua]
And the error in Terminal:
2013-03-21 19:18:15.736 Corona Simulator[48347:707] Runtime error:
2013-03-21 19:18:15.737 Corona Simulator[48347:707] …t/iOS/Deep Space Harvest/Deep Space Harvest/main.lua:28: attempt to call method ‘log’ (a nil value)
stack traceback:
[C]: in function ‘log’
…t/iOS/Deep Space Harvest/Deep Space Harvest/main.lua:28: in main chunk