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  Moving Levels  (Read 821 times)
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Offline Dirnol

Innocent Bystander





« Posted 2011-10-11 02:26:47 »

Hello,

I am currently working on a top down dungeon crawler-esque game, inspired by the iPhone game "Solomon's keep". The problem I am currently faced with is making the background move around the player. I understand how to make the level as a String, as well as how to use objects to create the walls, floors, exits, etc. The problem I am facing is trying to get all of the objects I create to move around the player, as the player stays in the middle of the screen.

I have a move class that can move every object, however, it seems like I have to call the move method for every object created under the actionPerformed class, and since the number of objects changes with every level there doesn't seem to be a feasible way to do that.

If anyone knows of a good tutorial that explains this, or wants to take a shot at explaining it themselves, I would greatly appreciate it Smiley

Thanks in advance,
Dirnol
Offline drakesword

Junior Member


Medals: 1



« Reply #1 - Posted 2011-10-11 03:55:20 »

Unfortunately  the only way I know how to manage this with the least modification would be to have two co-ordinate systems.

Imagine a window where everything inside of it is drawn and everything outside of it is not drawn. This window has a width a height and a position. Usually this position is the center of the window.

So one way would be to say "Is object x within the window (is the x position greater then the window x - 1/2 the window width and is less then the window x + 1/2 the window width) etc.

Whatever is in the window is then drawn but not to world co-ordinates ... to screen co-ordinates.

Offline ra4king

JGO Kernel


Medals: 336
Projects: 2
Exp: 5 years


I'm the King!


« Reply #2 - Posted 2011-10-11 05:18:38 »

Building on drakesword, you should have an xOffset and a yOffset variable and you just translate by those before you render. If you are using Java2D, that would be:
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g.getTransform().translate(xOffset,yOffset);

drawBackground(g);

g.getTransform().translate(-xOffset,-yOffset);

drawPlayer(g);

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