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2D All the way! / Tile Based Maps and Scrolling

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Sad Professor
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Joined: 14th Apr 2005
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Posted: 30th Jun 2005 23:50
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Hi, I'm developing tile based code which will draw a map from a 2D array of tiles. I understand the theory of it all but have a question regarding scrolling. I understand how to move the tiles when the focus of your map moves (usually the player) but how do you go about scrolling pixel by pixel as opposed to scrolling by tile - essentailly how do you read the value of the tile in and render only a portion of that tile?

I expect there is a really obvious answer to this question, but thought it'd be quick to answer
thanks
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Richard Davey
Retired Moderator
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Posted: 1st Jul 2005 00:04
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Render the current location to an off-screen bitmap (that is slightly larger than the current screen resolution) and then render that to the screen instead, when you cannot scroll any further you re-draw the off-screen bitmap with the new set of tiles, and repeat the process.

A great many people think they are thinking when they are really rearranging their prejudices.
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Sad Professor
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Posted: 1st Jul 2005 00:09
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Fantastic! Thanks a lot for the help!
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pizzaman
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Posted: 2nd Jul 2005 05:24 Edited at: 2nd Jul 2005 05:25
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Also have a look at this

http://www.thegamecreators.com/?m=codebase_view&i=0ee878a92195ee8c39c59bc3196e47d1

It shows you how to do what you want to do without any offscreen bitmaps.

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Caldar
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Posted: 13th Aug 2005 21:51
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Pizzaman, your tile engine is great but... how would you modify it for different resolutions?

I've tried simply changing the amount of tiles, the screen size, etc... but I still end up with errors.

I wish I could find a much simpler version that would be easier to understand.. barebones kinda example.

All the examples/tutorials on the net are in c++ which is completely beyond me.
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