Change Parents Class methods

amaximov · March 2013

Hi,

I have a class I use for a spaceship that inherits from Sprite. I call methods like setRotation() on it. However, I really wish I could call setRotation() but include some of my own code into that method. I realize I can do this, but this does not work because it simply overrides the setRotation() method.

 
spaceship = Core.class(Sprite)
 
function spaceship:init()
 
end
 
function spaceship:setRotation()
      -- SOME EXTRA CODE
      -- HOW DO I ACTUALLY ROTATE THE SPRITE FROM WITHIN THIS FUNCTION?
end

How would I actually rotate the sprite from within that method? I have seen some posts related to this but did not really understand them. Help would be very appreciated. Thanks!

amaximov · March 2013

Figured it out!

I do this at the start of the class

 
spaceship._setRotation = Sprite.setRotation
 
function spaceship:setRotation(angle)
     -- custom code
    spaceship._setRotation(angle)
end

ar2rsawseen · March 2013

@amaximov that would be the one way. But a shorter way is:

function spaceship:setRotation(angle)
     -- custom code
    Sprite.setRotation(self, angle)
end

amaximov · March 2013

thanks arsawseen, I will try to use that instead. One question, what are the proper html tags to use for code snippets? I use <"code"> but mine doesn't look as readable as your post.

ar2rsawseen · March 2013

Here's the link to FAQ for wrapping code:
http://www.giderosmobile.com/DevCenter/index.php/Forum_FAQ#How_can_I_highlight_my_Lua_code_in_the_forum_post.3F

amaximov · April 2013

Thanks!

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