readme.md

#Animated Matrix Rain using Corona SDK

See it in action here.

An experiment with Corona SDK.

main.lua

--animated matrix rain by joão colombo: http://joaocolombo.com using corona sdk: http://www.anscamobile.com/corona/

display.setStatusBar(display.HiddenStatusBar) --hide status bar

--make a black background
local background = display.newRect(0,0,display.contentWidth,display.contentHeight);
background:setFillColor(0,0,0);

--function to generate a number 
function generateNumber()
	local i = {0,1,2,3,4,5,6,7,8,9}; 
	return i[math.random(1, (table.getn(i)))];
end

--function to create a line
function createLine()

	--line variables
	local line = display.newGroup(); --create the line
	local numberSize = math.random(10,60); --the font size of the number
	local maxOfNumbers = display.contentHeight/numberSize; --max of numbers of a line
	local numberOfNumbers = math.random(7,maxOfNumbers); --number of number of the line
	
	--add numbers to the group with a loop
	local i = 0; 
	local numberY = 0; --the y of the last number
	local numberColor = {0, math.random(0,150), 0} --create a random color
	while (i <= numberOfNumbers) do --insert the number in the line
		local number = display.newText(generateNumber(),0, numberY, native.systemFont, numberSize); 
		if i == numberOfNumbers then --if is the last letter make it shine
			number:setTextColor(0, 230, 0);
		else --else use the random color
			number:setTextColor(numberColor[1], numberColor[2], numberColor[3]);
		end
		line:insert(number);
		numberY = numberY + numberSize;
		i = i + 1;
	end
	
	--animate line
	line.x = math.random(0, display.contentWidth);
	line.y = 0 - line.contentHeight;
	transition.to( line, {time=math.random(300,1000), alpha=0, y=display.contentHeight, onComplete=removeLine});
	
	--remove the line after transition
	function removeLine()
		line:removeSelf();
	end
	
	--create another line
	timer.performWithDelay(1, createLine);
end

--let's create the first line
createLine();