然后在飞机上已被添加到游戏,下一步是让它动起来。主要是为了应对触摸事件。
在C++通过重写ccTouchBegan()、ccTouchMoved()、ccTouchEnded()三个函数来响应触摸事件。
在Lua器中就能够了。
1.先设置该图层能够触摸。然后注冊响应函数onTouch
gameLayer:setTouchEnabled(true) gameLayer:registerScriptTouchHandler(onTouch)
2.onTouch函数有3个參数,第一个是事件的类型(began、moved、ended),后面两个參数就不用多说了。
function onTouch(eventType, x, y) if eventType == "began" then return onTouchBegan(x, y) elseif eventType == "moved" then return onTouchMoved(x, y) else return onTouchEnded(x, y) end end
3.分别实现3个触摸事件
local touchBeginPoint = nil function onTouchBegan(x, y) touchBeginPoint = {x = x, y = y} return true end function onTouchMoved(x, y) if PlaneLayer.alive() and PlaneLayer.containsTouchLocation(x,y) then --local offset = ccpSub(ccp(touchBeginPoint['x'],touchBeginPoint['y']),ccp(x,y)) --local toPoint = ccpAdd(ccp(PlaneLayer.getPlane():getPositionX(),PlaneLayer.getPlane():getPositionY()),offset) PlaneLayer.moveTo(x,y) end end function onTouchEnded(x, y) end
4.在onTouchMoved函数中出现了一个没见过的函数PlaneLayer.containsTouchLocation(x,y)。这种方法用来推断想触摸点是否在飞机的位置上。
function containsTouchLocation(x,y) local planeRect = plane:boundingBox() planeRect.origin.x = planeRect.origin.x - 15 planeRect.origin.y = planeRect.origin.y - 15 planeRect.size.width = planeRect.size.width + 30 planeRect.size.height = planeRect.size.height + 30 local b = planeRect:containsPoint(ccp(x,y)) return b end