-- Example program for the use of Lumiere
-- Matti Vapa, 2014


-- load the Lumiere as a module
os.load("lumiere")

-- URLs to some static images
local url1 = "http://web.inter.net/funnypic.png"
local url2 = "http://google.wikipedia.com/catnicorn.jpg"

-- URL to a gif animation
local url3 = "http://www.pixelsaresupercool.com/snazzyanimation.gif"

-- set the screen dimensions
local width = 16
local height = 16

-- this function initializes the screen, the prototype is
-- initScreen(width, height, side)
-- side is where the modem is located on the computer
-- the function returns a screen object
local screen = lumiere.initScreen(width,height,"back")

-- use Lumiere to download the images and animation
-- the functions take as an argument an URL and the
-- length of the largest dimension you want
-- images will be up- or downscaled to fit this
-- here we use the longest side of the screen as the size
local funny = lumiere.getImage(url1, math.max(screen.width, screen.height))
local cat = lumiere.getImage(url2, math.max(screen.width, screen.height))
local anim = lumiere.getAnimation(url3, math.max(screen.width, screen.height))

-- check if some of the downloads failed
if (not funny) or (not cat) or (not anim) then
	print("Getting the images failed :(")
	return
end

-- Lumiere can create images of one solid color, give as 0xRRGGBB
local red = lumiere.getColor(screen.width, screen.height, "0xFF0000")
local blue = lumiere.getColor(screen.width, screen.height, "0x0000FF")

-- set the screen first to white
-- note the use of : here
screen:setColor("0xFFFFFF")
sleep(1)

-- in Lumiere there is a fade effect which fades between two images
-- the prototype is
-- fade(screen, start, end, steps, speed)
-- you have to pass the function a screen object to draw on
-- start and end are the initial and final states of the animation
-- steps is the number of steps in the fade sequence
-- the function will sleep 1/speed seconds between each frame
lumiere.fade(screen, red, blue, 20, 5)
sleep(1)

-- use showImage to display an image
-- prototype is
-- showImage(image,x,y)
-- x and y are the screen coordinates of the image
-- with 1,1 being the upper left corner
-- x and y can be out of the screen bounds
screen:showImage(funny,1,1)
sleep(1)


-- with draw coordinates we can scroll the screen
-- this will scroll the screen down out of view
-- this might be flickery
for y = 1, screen.height do
	-- each loop first set the screen black
	screen:setColor("0x000000")
	-- and display the image one row lower than before
	screen:showImage(funny,1,y)
	sleep(0.3)
end
-- clear the screen with black color
screen:setColor("0x000000")
sleep(1)

-- fade from black to the second image
-- note that the faded images need to be of the same size
fade(screen, lumiere.getColor(screen.width,screen.height,"0x000000"), cat, 10, 2)
sleep(1)

-- display the animation
-- gif support is very very very primitive
-- and some gifs don't work at all (blame the Python Image Library)
-- the last parameter is speed, with 1/speed seconds of sleep between
-- frames
screen:showAnimation(anim,1,1,3)
sleep(1)

-- set screen to default yellow color of the illuminators
screen:setColor("0xFFFF00")