Currently I use x,y type of colision detection egif(x_pos > otherxpos)
{
// do this
}
etc...
is there any other ways of detecting collision like intersecting or something. Help would be appreciated as my current collision detection contains a lot of if() functions.
Thanks
Not really, but you can make a method to do it for you. Here's a suggestion, make a Collidable interface like this:
public interface Collidable
{
public boolean collidesWith(Collidable c);
public Shape getBounds();
}
Then you could have each object that should collide with something else implement the Collidable interface.
public class Enemy implements Collidable
{
//...
public boolean collidesWith(Collidable c)
{
//your implementation here
}
public Shape getBounds()
{
//your implementation here
}
}
Does that make sense?
So your getBounds() method could look like this:
public Shape getBounds()
{
return new Rectangle(xPos, yPos, width, height);
}
> is there any other ways of detecting collision like
> intersecting or something. Help would be appreciated
> as my current collision detection contains a lot of
> if() functions.
well most games have a lot of if's
in any case, your collision algorithm is only 4 of them
No. pic_width should be non-negative, so if (x_pos>npc) then you already know that (x_pos+pic_width>npc).
If you have two intervals [min1,max1] and [min2,max2] then they overlap unless the first is entirely before the second (max1<min2) or the second is entirely before the first (max2><min1).>
> No. pic_width should be non-negative, so if
> (x_pos>npc) then you already know that
> (x_pos+pic_width>npc).
I didn't explain well enough because I don't think you understood me.
I meant
if(x_pos < npcx + npcwidth && x_pos > npcx || x_pos + playerwidth > npc && x_pos + playerwidth < npcx + npcwidth)
{
gameover();
}
Hope you understand it a bit more. Using 4 ifs for detection will only base it around the top left of a picture. So what happens if the object hits the top right of the picture. Thats what the part after the || detects.
This code just detects the top of the players pic being hit. It is part of my asteroids type game.
Am I right or am I just being complicated lol.
Your two intervals are [x_pos,x_pos+playerwidth] and [npcx,npcx+npcwidth]. So the collision test is if (!(x_pos+playerwidth<=npcx) && !(npcx+npcwidth<=x_pos)) gameover();
where the <= is because you seem, for some reason, to want to use exclusive bounds. You can simplify slightly to if ((x_pos+playerwidth>npcx) && (npcx+npcwidth>x_pos)) gameover();
