[Corona SDK] 多螢幕支援定位函式

為方便 Universal version 的製作，在畫面配置上，我都是採用對應螢幕四方界線方式做定位如 top, left, right, bottom, centerX, centerY，這樣在多螢幕顯示時，物件的位置才能一致，以下是定位函式分享，提供給有需要的朋友使用。

	--[[
	moveTo function
	erinylin.com
	for Graphics 2.0
	]]--
	display.setDefault("background", 1, 1, 1)
	function moveTo(object, params)
	local T = display.screenOriginY -- Top
	local L = display.screenOriginX -- Left
	local R = display.viewableContentWidth - L -- Right
	local B = display.viewableContentHeight - T-- Bottom
	local cX, cY = display.contentCenterX, display.contentCenterY
	object.x, object.y = 0, 0
	local bounds = object.contentBounds
	local offsetX = (bounds.xMax + bounds.xMin) * 0.5
	local offsetY = (bounds.yMax + bounds.yMin) * 0.5
	local hW, hH = 0.5 * object.contentWidth , 0.5 * object.contentHeight
	if params.left then
	object.x = params.left+L + hW - offsetX
	elseif params.right then
	object.x = R-params.right - hW - offsetX
	elseif params.centerX then
	object.x = params.centerX + cX - offsetX
	end
	if params.bottom then
	object.y = B-params.bottom - hH - offsetY
	elseif params.top then
	object.y = params.top + T + hH - offsetY
	elseif params.centerY then
	object.y = params.centerY + cY - offsetY
	end
	return object
	end
	-------------------------------------
	-- usage
	-------------------------------------
	local rect1 = display.newRect( 0, 0, 50, 50 )
	rect1:setFillColor(1, 0, 0)
	moveTo(rect1, {top=0, left=0})
	local rect2 = display.newRect( 0, 0, 50, 50 )
	rect2:setFillColor(1, 0.2, 0)
	moveTo(rect2, {top=0, right=0})
	local rect3 = display.newRect( 0, 0, 50, 50 )
	rect3:setFillColor(1, 0.4, 0)
	moveTo(rect3, {bottom=0, right=0})
	local rect4 = display.newRect( 0, 0, 50, 50 )
	rect4:setFillColor(1, 0.6, 0)
	moveTo(rect4, {bottom=0, left=0})
	local group = display.newGroup()
	local rect5 = display.newRect( 0, 0, 50, 50 )
	rect5:setFillColor(1, 1, 0)
	group:insert(rect5)
	local rect6 = display.newRect( 0, 50, 50, 50 )
	rect6:setFillColor(1, 0, 1)
	group:insert(rect6)
	-- ignore anchor settings
	group.anchorX, group.anchorY= 0, 0
	-- grouping moveTo
	moveTo(group, {centerX=0, centerY=0})
	local rect7 = display.newRect( 0, 0, 50, 50 )
	rect7:setFillColor(0, 1, 1)
	rect7.anchorX, rect7.anchorY= 0, 0
	moveTo(rect7, {top=0, left=50})

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