Thread: collision

i am running into problem here. I have a arraylist called rect which store all bounds for ground. i am looping though it and checking for collision between player and arraylist bounds.

tile map 2d array:

1 = player
2 = ground
0 = background
 
1,0,0,0
2,2,0,2

I want to print "FLAG 1" if its collisied but if its not than print "FLAG 2". I am not 100% sure but i think the problem is the loop.

if arraylist size is 10 than, if player is standing on ground than it will print "FLAG 1" but than it will print 9 times "FLAG 2"

public void collision(Player p){
this.getBounds();for(int i = 0; i < rect.size(); i++){
    if(p.getBounds().intersects(this.rect.get(i)))
          System.out.println("FLAG 1");
    else
                 System.out.println("FLAG 2");
}
}

not sure if i made my question clear. I want to only print "Flag 1" if its touch the ground. and when its not touching than i only want to print "Flag 2"

o found the problem i think. the problem is here. i am testing player intersects with the whole arraylist. so if arraylist size is 20 than it will print "hi" once and it will print nothing 19 times bc no else.

for(int i = 0; i < rect.size(); i++){
if(p.getBounds().intersects(this.rect.get(i)))
System.out.println("FLAG 1");
else
System.out.println("FLAG 2");
}

so i was thinking some thing like this. this way it will only test if player is intersect any rect in arraylist.

for(int i = 0; i < rect.size(); i++)
{
      if(p.getBounds().intersects(this.rect.get(i))){
           flag = true;
          break;
      }
    else
       flag = false;
}
 
System.out.println(flag);
if(flag )
   System.out.println("Flag1");
else
System.out.println("flag2");

now flag prints:
true
false
false
false
....

it should prints true, true, true, true, true, bc player is touching the ground rect from arraylist.

Originally Posted by game06

it should prints true, true, true, true, true, bc player is touching the ground rect from arraylist.

is touching, or is intersecting? Are you sure they are actually intersecting and not beside one another? Check the values of the bounding boxes manually when you believe they should be intersecting and see what the numbers show