Location-Based Triggers?

I'm going to look around and try and find out how to do the type of "trapped" square setup that was in the video (such that when a player moves a token onto a specific tile, it triggers event X), but if anyone has a suggestion that would be awesome!

This should do it: moved to its own thread <a href="https://app.roll20.net/forum/post/140526/script-trap-script-like-in-vid#post-140526" rel="nofollow">https://app.roll20.net/forum/post/140526/script-trap-script-like-in-vid#post-140526</a> edit: updated because left and top are in px. edit edit: commented and made only work on move

from what I can gather, there's no drag or drop specific methods so you'd need to so some ghetto collision detection. My initial thought is that you can check the 'change:graphic' event and then query for objects that have the same top and left as your new location. If the query comes back with a result then you've found your trap and you can handle the event as you'd like. Otherwise just return from the function and wait for the next token move.

Hrm, if your trap graphic is a drawing and isn't snapped to the grid, the top/left method won't work.

Thanks Alex -- that's exactly what I was hoping for (pending Riley's 'easier solution', anyway)

Question part 2: how to make it trigger only once? &nbsp;(i.e., multiple characters moving to the same point over the session shouldn't get the trap mechanism. &nbsp;I was assuming some sort of var defined outside of the token that's moving, but I can't seem to pull that off. EDIT: @HoneyBadger, if you swap the == for a &lt;= or &gt;=, or both, that should solve that issue. &nbsp;Also works well for triggers like in the video, where you want something to trigger once the players pass a certain point.

Michael C. said: Question part 2: how to make it trigger only once? &nbsp;(i.e., multiple characters moving to the same point over the session shouldn't get the trap mechanism. &nbsp;I was assuming some sort of var defined outside of the token that's moving, but I can't seem to pull that off. EDIT: @HoneyBadger, if you swap the == for a &lt;= or &gt;=, or both, that should solve that issue. &nbsp;Also works well for triggers like in the video, where you want something to trigger once the players pass a certain point. you would just add a bool to say if its been triggered or not if it has then dont trigger if it hasnt then dont. You would have something like "var triggered = false;" before "on("change:token", function() {" then you would check it when you check the location or before, and when it finaly is triggered you just say "triggered&nbsp; = true;"

So if you have multiple scripts that fire when a token moves, how does the API decide which script works in which order?

HoneyBadger said: So if you have multiple scripts that fire when a token moves, how does the API decide which script works in which order? no idea, Riley could you enlighten us? But for traps you would pack it all into one script.

I was thinking of scripts that block token movement if the token is not the current token at the top of the initiative order, scripts that check for traps, or scripts that can trigger a text block and such.

Thanks Riley for the confirmation Would be best to just merge the on change events for more advanced users then.