Corona Grid Layout

main.lua

centerX = display.contentCenterX
centerY = display.contentCenterY
cWidth = display.contentWidth
cHeight = display.contentHeight
display.setStatusBar(display.HiddenStatusBar)

numCol = 20
numRow = 13
col = 1
row = 1

local rects = {}
local  rect = 
{
	x=cWidth/15-10,
	y=cWidth/15-10,
	width=cWidth/15-10,
	height=cWidth/15-10,
}

createBounds = function()

	leftWall = display.newRect(0, centerY, 10, cHeight)
	rightWall = display.newRect(cWidth, centerY, 10, cHeight)
	topWall = display.newRect(centerX, 0, cWidth, 10)
	bottomWall = display.newRect(centerX, cHeight, cWidth, 10)

end

createObjects = function()
	
	for i=col, numCol do
		for k=row, numRow do
			rects[i] = display.newRect(rect.x, rect.y, rect.width, rect.height)
			rects[i]:setFillColor(math.random(), math.random(), math.random())
			rect.x = rect.x + rect.width+1
			if(rect.x >= cWidth)then 
				rect.y = rect.y + rect.height+1 
				rect.x = cWidth/15-10
			end
		end
	end

end

createBounds()
createObjects()