--Create a window
window = Window:Create()
context = Context:Create(window)
world = World:Create()
camera = Camera:Create()
camera:Move(0,0,-3)

local rotationspeed = 90

--Create an emitter
emitter = Emitter:Create(500) 

local material = Material:Load("Materials/Effects/spark.mat") 
if (material) then
        emitter:SetMaterial(material) 
        material:Release() 
end

emitter:SetVelocity(0,0,0,0)  --set base velocity to 0
emitter:SetRotationSpeed(rotationspeed) 

while true do
        if window:Closed() or window:KeyHit(Key.Escape) then return false end
        
        Time:Update()
        world:Update()
        world:Render()
        
        if window:KeyDown(Key.Up) then
                rotationspeed = rotationspeed + 1
                emitter:SetRotationSpeed(rotationspeed) 
        elseif window:KeyDown(Key.Down) and rotationspeed>0 then
                rotationspeed = rotationspeed - 1
                emitter:SetRotationSpeed(rotationspeed) 
        end

        context:SetBlendMode(Blend.Alpha) 
        context:DrawText("Rotation speed: " .. emitter:GetRotationSpeed() .. " degrees per second." ,2,2) 
        
        context:Sync()
end