2d platformer advice - GameCreators Forum

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Tattered brush

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Joined: 1st Dec 2008

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Posted: 2nd Dec 2008 09:47

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Hi Guys

I'm quite new to programming and also darkBASIC. I am looking to make a 2D platformer like 3 Weeks in Paradise, Batman, Robocop etc. I was just wondering how you would make the background change to the next image when a character moves off screen. I don't want the background to scroll basically.
I also have the 2D plugin kit, does anyone know of any tutorials available that uses this plugin?
Any help or advice would be greatfully appreciated, thanks.

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AndrewT

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Joined: 11th Feb 2007

Location: MI, USA

Posted: 7th Dec 2008 02:23 Edited at: 7th Dec 2008 02:24

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Basically, you want to check if the character is off the screen like so:

+ Code Snippet

Function SpriteOffScreen( SpriteID as Integer )
   If Sprite X( SpriteID ) < 0 or Sprite X( SpriteID ) > Screen Width( ) or Sprite Y( SpriteID ) < 0 or Sprite Y( SpriteID ) > Screen Height( )
      ExitFunction 1
   EndIf
EndFunction 0

Once you know that it's off the screen you can change the background accordingly by changing the background sprite's image. However you also need to know if it's above the screen, below it, to the right of it or to the left of it, so here's what we'd do:

+ Code Snippet

If SpriteOffScreen( Character ) = 1
   If Sprite X( Character ) < 0
      Set Sprite Image Background, LeftImage
   EndIf
EndIf

That should do it.

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Tattered brush

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Posted: 7th Dec 2008 16:09

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Thanks for your help on that one, that's a great help.
Am not sure whether to have whole images for the background or to make the background from a series of tiles, how would I implement a tile based background with this code?

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2D All the way! / 2d platformer advice