如何获取电晕中当前碰撞物体的索引？

Question

我有一个名为ob1 的表格，其中包含 10 个图像（这些图像是随机创建并水平移动的），我在屏幕中间有一个栏，我已经为两者启用了物理并实现了碰撞事件侦听器以删除 @987654322 @image 当它们与 bar 碰撞时，但问题是当 3-4 个图像接近 bar 并且当第一个 ob1 与 bar 随机碰撞时，ob1 对象被删除但不是当前的 ob1 对象，怎么能我得到了当前碰撞的ob1对象的ID？

代码是

local ob1={}
for i=1,obslimit do
    ob1[i]=display.newImage( "images/ob1.png", 250,250)
    ob1[i].isVisible=false
    ob1[i].isAlive=false
    physics.addBody( ob1[i], "dynamic", {friction=1,bounce=0.0})
    ob1[i].gravityScale=0
    ob1[i].isBodyActive=false
end

--function to deal ob1 collision
local function ob1cols( self,event )
    if(event.phase=="began") then
        --print(self.myName..event.other.myName)
        local ob1_elem = require("mydata")
        --ob1_elem.new.isBodyActive=false
        ob1_elem.new.isVisible=false
        ob1_elem.new.isAlive=false
    end
end

--function to deal ob1 group pooling
local function getob1()
    --calling ob1 from pool
    for i=1, #ob1 do
        if not ob1[i].isAlive then
            --print( "got one" ) 
            return ob1[i]
        end
    end
    return nil
end

--function to deal obstacle spawning
local function obdecide(event)
    if (mytime==100) then
        --local ob1_elem = getob1()
        local ob1_elem = require("mydata")
        ob1_elem.new=getob1()
        if (ob1_elem.new~=nil) then
            ob1_elem.new.isVisible=true
            ob1_elem.new.isAlive=true
            ob1_elem.new.isBodyActive=true
            ob1_elem.new.x=math.random( 200,350 )
            --trying to add event listner for every object
            ob1_elem.new.myName="cactus"
            ob1_elem.new:setLinearVelocity( -20, 0 )
            ob1_elem.new.collision=ob1cols
            ob1_elem.new:addEventListener( "collision", ob1_elem.new)
        end
    elseif (mytime>100) then
        mytime=0
    end
end

Answer 1

-- add an ID field for each object like this:
local ob1={}
for i=1,obslimit do
    ob1[i].id = i -- ** this is what I mean ** --
    ob1[i]=display.newImage( "images/ob1.png", 250,250)
    ob1[i].isVisible=false
    ob1[i].isAlive=false
    physics.addBody( ob1[i], "dynamic", {friction=1,bounce=0.0})
    ob1[i].gravityScale=0
    ob1[i].isBodyActive=false
end

在碰撞监听器中尝试这个实现：

function onCollision (event)
    if (event.object1.id == 1 or event.object2.id == 1) then
        -- object collided is obj1[1]
    elseif (event.object1.id == 2 or event.object2.id == 2) then
        -- object collided is obj1[2]
        -- and so on. I hope you got this so far.
    and
end

Answer 2

试试这个：

ob1[i].name="object";

local function onLocalCollision( event,self )

if ( event.phase == "began" ) then

elseif ( event.phase == "ended" ) then
  if (event.other.name = "object") then
    event.other:removeSelf()
   end
 end

结束

bar.collision = onLocalCollision
bar:addEventListener("碰撞", bar)