OOP question

[tanguymario]

Hello,

I am quite new to nim language and started to develop a graphic app in web 
(using canvas / webgl).

I know nim is not OOP based but I still tried to achieve OOP using 'method'. 
But when I use two arguments using 'method' it does not work..

Am I wrong ? Or would there be better ways to implement that in nim ?

Thanks
    
    
    type
       Drawable* = ref object of RootObj
       
       Sprite* = ref object of Drawable
       
       Graphics* = ref object of Drawable
       
       Renderer* = ref object of RootObj
       
       Renderer2D* = ref object of Renderer
       
       RendererWebGL* = ref object of Renderer
    
    # OOP works here with one argument
    method printType*(d: Drawable) {.base.} =
       echo "Drawable"
    
    method printType*(s: Sprite) =
       echo "Sprite"
    
    method printType*(g: Graphics) =
       echo "Graphics"
    
    # When using multiple arguments OOP is not working
    method render*(r: Renderer, d: Drawable) {.base.} = discard
    
    method render*(r: Renderer2D, d: Drawable) = discard
    
    method render*(r: Renderer2D, g: Sprite) =
      # Do not go here...
       echo "Renderer2D Sprite"
    
    method render*(r: Renderer2D, g: Graphics) {.base.} =
      # Do not go here...
       echo "Renderer2D Graphics"
    
    var arr: seq[Drawable]
    
    let sprite1 = Sprite()
    let graphics1 = Graphics()
    arr.add(sprite1)
    arr.add(graphics1)
    
    var renderer: Renderer
    renderer = Renderer2D()
    
    for e in arr:
       e.printType()
       renderer.render(e)
    
    
    
    Run