collision script

[dontdothat]

hiya,

i was wondering, how do u make objects detect collision in a script, and then add 1 to a box named counter? im terrible at java but im ok at html, so i know what abouts the script is doing, but not sure how to do it (if that makes any sense)

if anybody would be kind enough to write a script along theese lines and point out which each bit is doing, so i can get a slight understanding......

thanks for your time, steve

[pellepiano]

If you have two movieclips ( clip1 and clip 2) you can have this code on one of them,

onClipEvent (enterFrame) {
// Check collision
if (this.hitTest(_root.clip2)) {
// Add to counter
_root.counter++;
}
}

[dontdothat]

movieclips....(eh?)

i have two elemnts i wud like to use, one which follows the mouse on the mouseY() and one elemnt that moves past it, (u av to catch em)

[ForumNewbie]

Not sure where the movieclips example was going.

I would just add a script to the movie, running every 1 frame, doing the following:

if (element1.collideRect(element2))
{
hitcounter+=1
}

I attach an example.

M.

[pellepiano]

I didnt know theres another way to check colission exept hitTest or checking x and y positions. Unfortunately your file would not open on my computer.
Could you explain please. What is collideRect?

[ForumNewbie]

Hi Pellepiano,

My example should run on 3D Flash Animator, version 4, release 4.
See http://www.3dfa.com for a free downloadable demo version.

3dfa has lots of nice, easy to use functionality for games, 3D stuff, and other Flash development. 'collideRect' is a command that tests if the bounding box of 1 element is in collision with that of another.

ie. 'element1.collideRect(element2)' would return true if the two elements were in collision.

Hope this helps to clarify,

Morgan.

[pellepiano]

Thanks!

I noticed I am in the wrong forum ( Im a Flash guy ). We do the same but with hitTest.
Sorry for the confusion.

Seems like a good and cheap alternative to Flash. Ive seen the demos and visited the site.

[dontdothat]

hiya, thanks for your help. I did the collide.rect method of things, and changed the variables in the script (element1) to the names of my elements, but when i played the movie, i got this error message: collideRect() is not a method of Null on line 1 if (dark.collideRect(ball)) 1 error found. can anybody help? If poosible, could sombody dl the example i have, and "fiddle" with it to see where it went wrong. thanks


ps: theres also a readme to explain what im wanting

thanx

[blanius]

Originally posted by dontdothat
hiya, thanks for your help. I did the collide.rect method of things, and changed the variables in the script (element1) to the names of my elements, but when i played the movie, i got this error message: collideRect() is not a method of Null on line 1 if (dark.collideRect(ball)) 1 error found. can anybody help? If poosible, could sombody dl the example i have, and "fiddle" with it to see where it went wrong. thanks


ps: theres also a readme to explain what im wanting

thanx

I didn't look at your code but you first have to get a 'handle' for your element or access it with the element function
assuming an element called dark and one called light (make sure that the "has properties for each is set"

Direct:
element ("dark").collideRect (element ("light"))

or in you start script assign handles to the elements

dark=element ("dark")
light.element ("light")

then in you action you can now use the 'handles'

dark.collideRect (light)


Oh and if you want to get really fancy you can detect collision on circular objects by calculating their distance and comparing it to their diameter using this function:

//*************************************
//Circle Collide
//*************************************
    
function C_collide(element1,element2)
    {
    //get width of both elements
    width1=(element1.getBounds().xMax-element1.getBounds().xMin)-6
    width2=(element2.getBounds().xMax-element2.getBounds().xMin)-6
    //get distance 
    a=element1.x - element2.x;
    b=element1.y - element2.y;
    dist= sqrt (a*a+b*b);
    //account for different sizes
    width=(width1/2)+(width2/2);
    //check distance and size
    
    //return t/f
    return dist<=width
    } 

[ForumNewbie]

Hi,

I attach a really simple example of how to start to add collisions to the movie:

You'll need to put something in to avoid getting multiple collisions on each drop, but this should give the general idea. I didn't put any fancy stuff in, coz that might be a bit confusing to start with.

M.

Incidentally - When you post movies on here, make sure to include any GIF's etc that are linked.

[dontdothat]

hiya

thanx for that example forumNewbie

is there anyway to add actions on collisions, like wen it hits it plays a sound?
and also can u write if else commands
so if it dusnt collide a point is deducted and a diff sound is played


thanks

[dontdothat]

hiya again

forumnewbies example was spot on, so i decieded to use that, so i copied it exactly but in place of my own images, but id get it adding 6 to the counter (the time the object would take to pass over the counter) starngly enough this never happend on the orignial.... (?????)

anyways i set to work to solve this, and came up with this, yet again my attempt hit the ground like a cow from mars...

can any1 help on this??

var counter

if(player.collideRect(moon))
{
setTimeout('counter+=2',5000);
}

i wrote this so that when the object collides it wait for 5 seconds before adding the score, i thought this would solve it, but im getting this error:

collideRect() is not a method of Null on line 11 if(player.collideRect(moon))
1 errors found

thanx yet again

[blanius]

that won't work.

You can do a number of things:

[list=1][*]Slow down how often you check for collision[*]Upon collision set a flag/variable to true and when no longer colliding set to false and only add once while true[*]When collision happens remove/move on of the objects so that they are no longer colliding[/list=1]

Each option has value and you have to decide in the context of your program which would make the most sense.

#2 would be my usual way.

if (player.collideRect(moon)){//Did we collide
        if (!player.hitcheck){//Make sure we weren't already colliding
               player.hitcheck=true;//if not the set true we are
               _root.counter++;//update counter
               }         
      }else{
         player.hitcheck=false
       
        } 

something like that or
in start script set
player.hitcheck=false;
then

if (player.collideRect(moon) && player.hitcheck!=true){
//if colliding and not already colliding
        root.counter++;
        player.hitcheck=true;//set already colliding
}
if (!player.collideRect(moon) && player.hitcheck==true){
//if NOT colliding and hitcheck is true set to false.
      playerhitcheck=false;
} 

These are off the cuff and untested but should at least give you the idea.

[ForumNewbie]

I put idea #2 into the example, and added a sound for when the right hand element hits the player.

Good luck with the rest of it.

M.