cocos quick單純截取某個節點的圖

--node，要截圖這個精靈的點
-- params:{
-- 	size:截取的大小
-- 	bigger：外闊的寬度
-- }
--[[
	--如果需要轉動的話
	node:setRotation(90)
	node:performWithDelay(function (  )
		node:setRotation(0)
	end, 0.01)
]]
function  MyApp:doCaptureNode(node, params)
	params = checktable(params) or {}
	local bigger = params.bigger or 0
	local node = node or display.getRunningScene()
	local parent = node:getParent()
	local parentPos
	if parent then
		parentPos = cc.p(parent:getPosition())
		local basePos = parent:convertToWorldSpace(cc.p(0, 0))
		parent:setPosition(cc.pSub(parentPos, basePos))
	end
	local nodePos = cc.p(node:getPosition())
	local nodeSize = node:getContentSize()
	local nodeBasePos = node:convertToWorldSpace(cc.p(0,0))
	node:setPosition(nodePos.x-nodeBasePos.x+bigger, nodePos.y-nodeBasePos.y+bigger)

	nodeSize = params.size or nodeSize

	local texture = cc.RenderTexture:create(nodeSize.width+2*bigger, nodeSize.height+2*bigger);
	texture:beginWithClear(0,0,0,0)
	node:visit()
	texture:endToLua()

	if parent then
		parent:setPosition(parentPos)
	end
	node:setPosition(nodePos)
	-- local sp = texture:getSprite()
	texture:getSprite():align(display.BOTTOM_LEFT,0,0)
	texture:saveToFile("myapp.png", cc.IMG_FORMAT_PNG)
	return texture
end