Scrolling game

Newbie & Debugging Questions
#1

How would I go about scrolling a 2D game, would I use a camera object, and if so, I would I work out the offset and how would I render that?

I’m not using any game engine, btw.

Sorry if this isnt a very descriptive post…

#2

Umm, there is no need for a camera object in a 2D game.
2D games usually draw, or move tiles/sprites around in a off-screen buffer.

#3

I wasn’t sure if I should use one, but how would I add scrolling on the x and y axis?

#4

There is no NEED, but it makes things very easy. For example rotating a camera vs. rotating EVERYTHING and accordingly - whats do you think makes more sense ?

Well, what are you using ?

#5

I’m using Java2D

#6

Never actually done this before but a basic way of doing it would be:


AffineTransform identity = new AffineTransform();

g2d.translate(-viewX, -viewY);

//
//rendering code here
//

g2d.setTransform(identity);

where viewX and viewY are the x and y coordinates of the top left corner of your view. If you wanted to stay centered on the character you could do this first:


viewX = charX - screenWidth/2;
viewY = charY - screenHeight/2;

Where charX and charY are the coordinates of the character.

#7

of course you need to think about culling as well

in java2d I wrote my own camera, but it was just a rect and whenever I draw ANYTHING I would subtract camera.x and camera.y from that position