Collision Detection

[Codejunkie]

Hi, I'm somewhat new to java game development and thought I'd give SFML a try. I'm trying to do some basic collision detection. For some reason it's not detecting anything. Here's my function for my collision:

Code: [Select]

public static boolean isColliding(ArrayList<Sprite> sprites, Sprite spriteA){
boolean result = false;
for(Sprite sprite : sprites){
if(spriteA.getGlobalBounds().intersection(sprite.getGlobalBounds())!= null){
result = true;
break;
}

}
return result;
}
Am I on the right track at least?

[Hapax]

I don't know Java but it looks like it's the right kind of thing.
It may be a specific coding error that only someone that knows Java can spot.

[dabbertorres]

It looks right to me from here. Could you create a minimal example?

[Nexus]

Have you tried to debug that code and compare your expectations with the actual results?

[Codejunkie]

It runs fine without collision detection, but as soon as I enable it; the sprite won't move at all.

[Nexus]

That doesn't answer my question

Looks like it collides too often, and the collision response prevents the sprite from moving. You should really use a debugger, with it you can solve this in minutes.

[Codejunkie]

Okay, I added this line to my code:

Code: [Select]

System.out.println("spriteA: " + spriteA.getGlobalBounds() + "\nsprite" + i + ": " + sprite.getGlobalBounds());
And got this as a result:

spriteA: FloatRect{left=561.0, top=296.0, width=128.0, height=128.0}
sprite1: FloatRect{left=56.0, top=176.0, width=128.0, height=128.0}
spriteA: FloatRect{left=561.0, top=296.0, width=128.0, height=128.0}
sprite2: FloatRect{left=176.0, top=56.0, width=128.0, height=128.0}
spriteA: FloatRect{left=561.0, top=296.0, width=128.0, height=128.0}
sprite3: FloatRect{left=176.0, top=296.0, width=128.0, height=128.0}
spriteA: FloatRect{left=561.0, top=296.0, width=128.0, height=128.0}
sprite4: FloatRect{left=296.0, top=176.0, width=128.0, height=128.0}
spriteA: FloatRect{left=561.0, top=296.0, width=128.0, height=128.0}
sprite5: FloatRect{left=561.0, top=296.0, width=128.0, height=128.0}

Should I be using getPosition() instead of getGlobalBounds() possibly?

[Codejunkie]

I think I figured it out. I have all of my sprites (including the one I designated as my "player" sprite) in the ArrayList of sprites to check for collision. Thus, it was checking for a collision against itself... *doh* how embarrassing...