电晕+碰撞不起作用

Question

我正在学习 Corona，我正在尝试使用碰撞事件。以下程序的目标是使用 transition.to 使岩石朝着汽车移动。并打印一行报告碰撞发生的地方。

但是，它不起作用。而且，我连消息都收不到"enterenter"，为什么程序连回车功能都进不去？

我的代码如下。提前谢谢你。

local composer = require( "composer" )
local scene = composer.newScene()


local physics = require "physics"
physics.start(); physics.pause()

local function onLocalCollision( self, event )

if ( event.phase == "began" ) then
    print( self.myName .. ": collision began with " .. event.other.myName )

elseif ( event.phase == "ended" ) then
    print( self.myName .. ": collision ended with " .. event.other.myName )
end
end


local widget = require "widget"

function scene:create( event )
print("entercreate")
local sceneGroup = self.view

local backgrd = display.newImage("background2.png",0,260)
backgrd:scale(3,3)
local car = display.newImage("car2.png",80,270)
physics.addBody(car,"static")
car.myName="Car"

local rock = display.newImage("rock.jpg",520,280)
rock:scale(0.05,0.05)
physics.addBody(rock,"static")
rock.myName="rock"


sceneGroup:insert(backgrd)
sceneGroup:insert(car)
sceneGroup:insert(rock)
transition.to(backgrd,{time=24000, x=-1800,onComplete=endScroll})
transition.to(rock,{time=4000, delay=2500,x=-40})
end

function scene:enter( event )
print("enterenter")
physics.start()
local sceneGroup = self.view
Runtime:addEventListener( "collision", onLocalCollision )
end



scene:addEventListener( "create", scene )
scene:addEventListener( "enter", scene )


return scene

Answer 1

使用本地和全局（运行时）侦听器的工作代码：

local widget = require "widget"
local composer = require( "composer" )
local scene = composer.newScene()

local physics = require "physics"
physics.start()
physics.setGravity( 0,0 )

local function onGlobalCollision( event )
        local target = event.object1
        local other = event.object2

        if ( event.phase == "began" ) then
            print( "GLOBAL: " .. target.name .. ": collision began with " .. other.name )
        elseif ( event.phase == "ended" ) then
            print( "GLOBAL: " .. target.name .. ": collision ended  with " .. other.name )      
        end
    end

local function onLocalCollision( event )
    local target = event.target
    local other = event.other

    if ( event.phase == "began" ) then
        print( "LOCAL: " .. other.name .. ": collision began with " .. target.name )
    elseif ( event.phase == "ended" ) then
        print( "LOCAL: " .. other.name .. ": collision ended  with " .. target.name )       
    end
end

function scene:create( event )
    print("scene:create")


    local sceneGroup = self.view

    local car = display.newRect( 100, 100, 100, 100 )
    car.name = "car"
    physics.addBody( car )

    local rock = display.newRect( 250, 250, 100, 100 )
    rock.name = "rock"
    rock:setFillColor( 0.5, 0.5, 0.5 )
    physics.addBody( rock )
    rock:addEventListener( "collision", onLocalCollision )

    sceneGroup:insert(car)
    sceneGroup:insert(rock)

    transition.to(rock,{time=4000, x = -40, y = -100})

    Runtime:addEventListener( "collision", onGlobalCollision )
end

function scene:enter( event )
    print("scene:enter")    
    local sceneGroup = self.view

end

scene:addEventListener( "create", scene )
scene:addEventListener( "enter", scene )


return scene

你的代码的问题是两个物体是静态的，两个静态物体不能相互碰撞，而且在 composer 中没有叫做 scene:enter 的东西（所以这就是为什么它不' 没有被调用，因此没有 onLocalListener).

Some body types will — or will not — collide with other body types. In a collision between two physical objects, at least one of the objects must be dynamic, since this is the only body type which collides with any other type. See the Physics Bodies guide for details on body types.

https://docs.coronalabs.com/daily/guide/physics/collisionDetection/index.html

这里有一些关于 Composer API 的信息，你可能会用到 scene:show： https://coronalabs.com/blog/2014/01/21/introducing-the-composer-api-plus-tutorial/

电晕+碰撞不起作用

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