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  Side scroller - collision detection  (Read 2088 times)
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Offline Thinking

Senior Newbie

Java games rock!

« Posted 2004-11-23 18:55:19 »

Hello everyone.

I'm making a side scroller fighting game and I have
a couple of questions. I've got the sprite animation
working and I'm wondering if I should have gravity
built into the Sprite (base class) or have it as
a implementation detail. It got me thinking that I could
use setters for speed, jumping power,
animations, etc.. So you could just extend Sprite and use these methods in your constructor. Another approach is to create a ConfiguredSprite class that subclasses Sprite and add a constructor to ConfiguredSprite that accepts the file name of a sprite configuration file, and the ConfiguredSprite class does the parsing.

another problem I have is collision detection.
I first check for collisions with the bounding rectangles
of the sprites current images. And then if a collision occurs
I use pixel perfect collision detection. The problem is I don't know what to do once I know that they are colliding, how to line them up side by side is a problem.
Offline nonnus29

Senior Devvie

Giving Java a second chance after ludumdare fiasco

« Reply #1 - Posted 2004-11-24 14:47:02 »

I think the common consensus is to separate the graphical, physical, and behavior aspect of game entities.

So your sprite is the graphical representation.  You could have a bounding_box/physics object that interacts with other bb/physics objects, and a behavior object (accept user input for the player and an ai object of some sort for the npcs)

So the supposed class may look like:

public class Fighter {
  private Sprite sprite;
  private PhysObj physobj;
  private Behavior behavior;

  public Fighter (Behavior b)  {
     behavior = b;
  public void update(float deltaT)  {
  public void draw(Graphics g)  {

Or whatever.

So far as collision detection and physics; thats a really big subject and my knowledge is not great and I'm tired of typing......
Offline Thinking

Senior Newbie

Java games rock!

« Reply #2 - Posted 2004-11-24 17:19:07 »

Thank you nonsus. That will really help clean up my Sprite class.  Smiley
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Offline Thinking

Senior Newbie

Java games rock!

« Reply #3 - Posted 2004-11-24 17:20:40 »

I'm really sorry nonnus, I apologize for miss-spelling your name.
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