A problem in particles

So I wanted to make a line of particles that will appear when I right click with an item. Previously, I have succeeded in making particles appear at one location when I right click. I did that by just getting a location of player and playing an effect there. Then I tried to make a line by using this code:

Code:

    Location start = p.getLocation();
    Vector i1 = start.getDirection().multiply(1);
    Vector i2 = start.getDirection().multiply(2);
    Vector i3 = start.getDirection().multiply(3);
    Vector i4 = start.getDirection().multiply(4);
    Vector i5 = start.getDirection().multiply(5);
    Location l1 = start.add(i1);
    Location l2 = l1.add(i2);
    Location l3 = l2.add(i3);
    Location l4 = l3.add(i4);
    Location l5 = l4.add(i5);
    w.playEffect(l5, Effect.MOBSPAWNER_FLAMES, null);
;

I want the line to be 5 blocks long in the direction that I am looking at. What happens is that one particle appears 15 blocks away instead. I don't understand why that happens.

EDIT: Wait, I am multiplying it but I need to add? How will I do that?

 

@JoltTheBolt
Uh.. yeah that's kinda what you told it to do.

You've set l1 and added i1 to it, so you have a 1x multiplier of getDirection()
Then you set l2 to be equal to l1 and then added i2 to it, so now you have a multiplier of 1 + 2 = 3
Then you set l3 to be equal to l2 and then added i3 to it, so now you have a multiplier of 1 + 2 + 3 = 6
So on..
Until you have l5, which is i1 + i2 + i3 + i4 + i5, which is: 1 + 2 + 3 + 4 + 5, which, you guessed it, is 15.

The solution? Just continuously add i1 to each location instead.

 

It didn't work. All the locations (l1, l2, l3, l4 , l5) turn out to be the same location (1 block, 5 blocks away from me in the direction I am looking at) and 5 particles appear on that location. I know I am doing something wrong because I just don't understand vectors that much, right now. Sorry about that.

Code:

Location start = p.getLocation();
    Vector i1 = start.getDirection().multiply(1);
    Location l1 = start.add(i1);
    Location l2 = l1.add(i1);
    Location l3 = l2.add(i1);
    Location l4 = l3.add(i1);
    Location l5 = l4.add(i1);
    w.playEffect(l1, Effect.MOBSPAWNER_FLAMES, null);
    w.playEffect(l2, Effect.MOBSPAWNER_FLAMES, null);
    w.playEffect(l3, Effect.MOBSPAWNER_FLAMES, null);
    w.playEffect(l4, Effect.MOBSPAWNER_FLAMES, null);
    w.playEffect(l5, Effect.MOBSPAWNER_FLAMES, null);

 

@JoltTheBolt
Theoretically it works. Adding a direction to a vector will give you vector + direction so I'm not sure why that wouldn't be working. Print out the value of l1-l5 and see what it says.

 

@CraftCreeper6 Thanks for your help. It's not the most efficient because I simply increase the lines in code by copying and pasting but it works. I fixed it by doing this:

Code:

Location loc = p.getLocation();
    Vector v1 = loc.getDirection().multiply(1);
    Vector v2 = loc.getDirection().multiply(2);
    Location l1 = loc.add(v2);
    w.playEffect(l1, Effect.MOBSPAWNER_FLAMES, null);
    w.playEffect(l1, Effect.MOBSPAWNER_FLAMES, null);
    for (Entity en1 : l1.getChunk().getEntities()){
        if (en1.getLocation().distance(l1) < 1){
            en1.setFireTicks(100);
            Damageable d1 = (Damageable) en1;
            d1.damage(10);
        }

}
    Location l2 = l1.add(v1);
    w.playEffect(l2, Effect.MOBSPAWNER_FLAMES, null);
    w.playEffect(l2, Effect.MOBSPAWNER_FLAMES, null);
    for (Entity en2 : l2.getChunk().getEntities()){
        if (en2.getLocation().distance(l2) < 1){
            en2.setFireTicks(100);
            Damageable d2 = (Damageable) en2;
            d2.damage(10);
        }

}
    Location l3 = l2.add(v1);
    w.playEffect(l3, Effect.MOBSPAWNER_FLAMES, null);
    w.playEffect(l3, Effect.MOBSPAWNER_FLAMES, null);
    for (Entity en3 : l3.getChunk().getEntities()){
        if (en3.getLocation().distance(l3) < 1){
            en3.setFireTicks(100);
            Damageable d3 = (Damageable) en3;
            d3.damage(10);
        }

}
    Location l4 = l3.add(v1);
    w.playEffect(l4, Effect.MOBSPAWNER_FLAMES, null);
    w.playEffect(l4, Effect.MOBSPAWNER_FLAMES, null);
    for (Entity en4 : l4.getChunk().getEntities()){
        if (en4.getLocation().distance(l4) < 1){
            en4.setFireTicks(100);
            Damageable d4 = (Damageable) en4;
            d4.damage(10);
        }

}

I think it is how you said I should do it but with a bit different route.