碰撞尝试索引全局(零值)

时间:2013-02-28 14:53:19

标签: lua corona

当我尝试与BCloud1.png床发生碰撞时,我试图将全局'BCoud1'(零值)编入索引?有什么简单的方法来解决这个错误?

我做到了这一点:

function getRandomStar()
    local temp = starTable[math.random(1, #starTable)] -- Get a random star from starTable
    local randomStar = display.newImage(temp.imgpath) -- Set image path for object

    if ( temp.imgpath == "BCloud1.png" ) then
    temp.imgpath = "BCloud"..tostring(math.random(1, 3))..".png";
    physics.addBody( BCloud1, { density=3.0, friction=0.5, bounce=0.3 } )
    end

    if ( temp.imgpath == "BCloud2.png" ) then
    temp.imgpath = "BCloud"..tostring(math.random(1, 3))..".png";
    physics.addBody( randomStar, "static", { density=.1, bounce=.1, friction=.2, radius=45 } )  
    end

    if ( temp.imgpath == "BCloud3.png" ) then
    temp.imgpath = "BCloud"..tostring(math.random(1, 3))..".png";
    physics.addBody( randomStar, "static", { density=.1, bounce=.1, friction=.2, radius=45 } )  
    end

    randomStar.myName = "star" -- Set the name of the object to star
    randomStar.movementSpeed = temp.movementSpeed; -- Set how fast the object will move
    randomStar.x = math.random(-30, _W);    
    randomStar.y = -35;
    randomStar.rotation = math.random(0,20) -- Rotate the object

    starMove = transition.to(randomStar, {
        time=randomStar.movementSpeed, 
        y=500,
        onComplete = function(self) self.parent:remove(self); self = nil; 
        end
        }) -- Move the star
end--END getRandomStar()


local function onLocalCollision1( self, event )
    if ( event.phase == "began" ) then
print (" Collision1 ")
    elseif ( event.phase == "ended" ) then
    end
end
BCloud1.collision = onLocalCollision1
BCloud1:addEventListener( "collision", BCloud1.png)

1 个答案:

答案 0 :(得分:1)

您在哪里创建名为BCloud1的显示对象?

在您的代码中:

BCloud1.collision = onLocalCollision1
BCloud1:addEventListener( "collision", BCloud1.png)

BCloud1需要存在,您发布的代码永远不会创建。我怀疑它是从你的getRandomStar()函数开始的。您永远不会返回创建的对象。但是在上面的eventListener设置中,你将BCloud1.png视为一个名为BCloud1的表,其成员名为.png,虽然看着它,BCloud1.png听起来像是图像的文件名。也许你错过了类似的东西:

BCloud1 = display.newImage(“BCloud1.png”)