--[[
hi!  This should be a pretty easy program to follow. 

Select this main.lua file and the fireDjinn.png file, and add them to a zip archive.

Name the archive something.love, instead of something.zip.
You can change this name after you've already compressed everything into a zip file, if you want.
If you have love2d from love2d.org installed, you should now be able to click on the game to run it.

FYI, another way to run the game is to put main.lua and fireDjinn.png into a folder,
and then drag that folder onto the blue, circular LOVE icon which you might have on your virtual desktop.
--]]

function love.load()

	-- load the image of the fire djinn
	image=love.graphics.newImage('fireDjinn.png')
	
	-- get the dimensions of the fire djinn
	w=image:getWidth()
	h=image:getHeight()
	
	-- get some variables that will be used with the following funciton
	--love.graphics.draw( drawable, x, y, r, sx, sy, ox, oy, kx, ky )
	--for info see: http://love2d.org/wiki/love.graphics.draw
		
	r=0 

	--find the center of the 'stage'
	x=love.graphics.getWidth()/2
	y=love.graphics.getHeight()/2

	--make sprite twice as big
	sx=2	sy=2 
	
	--move the coordinates of the image from the upper left, to the center
	ox=w/2
	oy=h/2

	-- pulsing circle around djinn
	radius=w
	changeInRadius=20
	
	--movement
	speed=150
	
end


function love.draw()

	love.graphics.circle('line',x,y,radius,30)
	love.graphics.draw(image, x, y, r, sx, sy, ox, oy, kx, ky )
	
	if radius>w then
		love.graphics.print('use the arrow keys!',x-50,y+60)
	end
end

function love.update(dt)

	--make circle pulse
	radius = radius + changeInRadius*dt
	
	if radius>w*1.2 or radius<w*0.8 then
		changeInRadius = - changeInRadius
	end
	
	--move djinn
	local lkd=love.keyboard.isDown
	local s=speed
	if lkd('left') then x=x-s*dt end
	if lkd('right') then x=x+s*dt end
	if lkd('up') then y=y-s*dt end
	if lkd('down') then y=y+s*dt end
	
	--keep coordiantes on screen
	x=math.min(math.max(x,0),800)
	y=math.min(math.max(y,0),600)
end

function love.keypressed(key)
	--change the direction the djinn is looking.
	if key=='left' then sx=-2 end
	if key=='right' then sx=2 end
end