Corona SDK：如何识别碰撞对象？

Question

我是 Corona 开发的初学者，我必须确定 3 个对象之间的碰撞。事实上，这是我的代码：

The first object is my player : 

player = display.newImageRect("ballon.png", 150,170 )
player.anchorX = 0.5
player.anchorY = 0.5
player.x = display.contentCenterX - 450
player.y = display.contentCenterY+250
physics.addBody(player, "static", {density=0.1, bounce=0.1, friction=0.1,})
player.myName="player"
screenGroup:insert(player)

第二个对象是在函数中创建的：

function addWindSlow(self,event)

height = math.random(display.contentCenterY - 200, display.contentCenterY + 200)
windslow = display.newImage( "wind-neg.png")
windslow.x = display.contentWidth
windslow.y = height
windslow.speed = 4
windslow.myName="windslow"
physics.addBody(windslow, "static", {density = 0.1, bounce = 0, isSensor = false})
elements:insert(windslow) end

function addWindFast(self,event)

height = math.random(display.contentCenterY - 200, display.contentCenterY + 200)
windfast = display.newImage( "wind-pos.png")
windfast.x = display.contentWidth
windfast.y = height
windfast.speed = 4
windfast.myName="windfast"
physics.addBody(windfast, "static", {density = 0.1, bounce = 0, isSensor = false})
elements:insert(windfast) end

最后，第三个对象是相同的，但称为“addWindFast() 与不同的图像”

所以我想知道，一旦我的玩家与 windslow 发生碰撞，我需要执行一个动作......如果它是对象 windfast，另一个动作。这是我的代码：

function onCollision( event )


    if ( event.phase == "began" ) then
    if event.other.windslow and event.other.isVisible==true then
        print("windslow has been touch !")
    end

end

结束

我发现了一些关于预碰撞的信息，我将在获得如何“识别”对象的信息后使用它...我需要防止碰撞并在玩家要触摸时避免它风速或风速。

感谢大家的付出！

Answer 1

看起来windslow 和windfast 是在onCollision 事件处理程序之外定义的，因此您应该与它们进行比较：

function onCollision( event )
    if ( event.phase == "began" ) then
        if event.other == windslow and event.other.isVisible==true then
            print("windslow has been touch !")
        end
        if event.other == windfast and event.other.isVisible==true then
            print("windfast has been touch !")
        end
    end
end -- (missing from your post but probably in your code)

以上假设您已在播放器上注册了碰撞事件。您还可以在每次风中注册不同的碰撞处理程序：

windslow:addEventListener("collision", onCollisionSlow)
windfast:addEventListener("collision", onCollisionFast)

在这种情况下，两个碰撞处理程序可以只检查if event.other == player。这样做的好处是您可以将每个代码分开。你当然可以对你的播放器处理程序做同样的事情：

function onCollisionSlow(other)
    print('collided with slow')
end

function onCollisionFast(other)
    print('collided with fast')
end

collisionHandlers = {
    [windslow] = onCollisionSlow, 
    [windfast] = onCollisionFast,
}

function onCollision( event )
    if ( event.phase == "began" ) then
        collisionFunc = collisionHandlers[event.other]
        if collisionFunc ~= nil and event.other.isVisible then
            collisionFunc(event.other)
        end
    end
end 

Answer 2

您可以使用您指定的 myName 属性来识别另一个对象。

例如：

function onCollision( event )

   if ( event.phase == "began" ) then
      if (event.other.myName == "windslow" and event.other.isVisible==true) then
         print("windslow has been touched!")
      elseif (event.other.myName = "windfast" and event.other.isVisible==true) then
         print("windfast has been touched!")
   end 
end