Graph Filter Demo

main.lua

display.setStatusBar( display.HiddenStatusBar )

local effect = {
	language = "glsl",
	category = "filter",
	name = "graphDemo",
	graph = 
	{
		nodes = {
			dotted	=	{ effect="filter.polkaDots", input1="paint1" },
			bulged	=	{ effect="filter.bulge", input1="dotted" },
		},
		output = "bulged",
	},
}


display.loadRemoteImage( "https://upload.wikimedia.org/wikipedia/en/2/24/Lenna.png", "GET", function( event )
	if ( event.isError ) then
        print ( "Network error - download failed" )
        return
 	end
 	local image = event.target
 	local r = image.width/image.height
 	if display.contentWidth/display.contentHeight > r then
 		image.height = display.contentHeight*0.8
 		image.width = image.height*r
 	else
 		image.width = display.contentWidth*0.8
 		image.height = image.width/r
 	end

 	graphics.defineEffect( effect )

	image.fill.effect = "filter.custom.graphDemo"

	image.fill.effect.bulged.intensity = 0.85

	image.fill.effect.dotted.numPixels = 8
	image.fill.effect.dotted.dotRadius = 1
	image.fill.effect.dotted.aspectRatio = ( image.width / image.height )

	timer.performWithDelay( 2000, function(  )
		Runtime:addEventListener( "enterFrame", function( e )
			image.fill.effect.bulged.intensity = 0.85 + math.abs(math.sin(e.time*0.001)*0.2)
		end )
	end )
	
end, "lenna.png", display.contentCenterX, display.contentCenterY )