cocos2d-lua物理

local Scene = class("Scene",function()
return cc.Scene:createWithPhysics() -- 物理场景
end)

function Scene:ctor()
local layer = cc.Layer:create()
self:addChild(layer)

-- 世界大小
self.visibleSize = cc.Director:getInstance():getVisibleSize()

-- 设置物理世界重力
local gravity = cc.p(0,-1000)
self:getPhysicsWorld():setGravity(gravity)

-- 物理世界显示包围盒
self:getPhysicsWorld():setDebugDrawMask(cc.PhysicsWorld.DEBUGDRAW_ALL) -- cc.PhysicsWorld.DEBUGDRAW_ALL显示包围盒 cc.PhysicsWorld.DEBUGDRAW_NONE不显示包围盒

-- 创建物理边框
local edgeBody = cc.PhysicsBody:createEdgeBox( self.visibleSize, cc.PhysicsMaterial( 1,1 ,0), 3)
local edgeNode = cc.Node:create()
layer:addChild( edgeNode)
edgeNode:setPosition( self.visibleSize.width * 0.5 , self.visibleSize.height * 0.5 )
edgeNode:setPhysicsBody( edgeBody)

-- 材质类型
local MATERIAL_DEFAULT = cc.PhysicsMaterial(0.1, 0.5, 0.5)                      -- 密度、碰撞系数、摩擦力

-- 球
local ball = cc.Sprite:create("btn-a-0.png")

-- 刚体
local body = cc.PhysicsBody:createBox(ball:getContentSize(), MATERIAL_DEFAULT)  -- 刚体大小，材质类型

-- 设置球的刚体属性
ball:setPhysicsBody(body)   -- 设置球的刚体
ball:setPosition(display.center)
layer:addChild(ball)

-- 触摸事件
local function onTouchBegan(touch, event)
local location = touch:getLocation()
local arr = self:getPhysicsWorld():getShapes(location)

local body = nil
for _, obj in ipairs(arr) do
if obj:getBody() then
body = obj:getBody()
end
end

if body then
local mouse = cc.Node:create()
local physicsBody = cc.PhysicsBody:create(PHYSICS_INFINITY, PHYSICS_INFINITY)
mouse:setPhysicsBody(physicsBody)
physicsBody:setDynamic(false)
mouse:setPosition(location)
layer:addChild(mouse)
local joint = cc.PhysicsJointPin:construct(physicsBody, body, location)
joint:setMaxForce(5000.0 * body:getMass())
cc.Director:getInstance():getRunningScene():getPhysicsWorld():addJoint(joint)
touch.mouse = mouse

return true
end

return false
end

local function onTouchMoved(touch, event)
if touch.mouse then
touch.mouse:setPosition(touch:getLocation())
end
end

local function onTouchEnded(touch, event)
if touch.mouse then
layer:removeChild(touch.mouse)
touch.mouse = nil
end
end
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local touchListener = cc.EventListenerTouchOneByOne:create()
touchListener:registerScriptHandler(onTouchBegan, cc.Handler.EVENT_TOUCH_BEGAN)
touchListener:registerScriptHandler(onTouchMoved, cc.Handler.EVENT_TOUCH_MOVED)
touchListener:registerScriptHandler(onTouchEnded, cc.Handler.EVENT_TOUCH_ENDED)
local eventDispatcher = layer:getEventDispatcher()
eventDispatcher:addEventListenerWithSceneGraphPriority(touchListener, layer)
return Scene