Vector trace possible?

I'm making a game for my Dad to replicate the gameplay of an old 80's vic 20 game ( which I can't remember the name of - if anyone had a vic 20, do you remember this game? )

I'd like to run a vector trace every tick or so to check there are no gaps in the chunks and cause the blocks to fall to fill the gap.

Is this possible, or would I just fire upwards invisible sprites to collide with the blocks and make them fall that way?

For some reason also it doesn't work online- so you'll have to download the capx to play.

Screenshot :

<img src="http://www.johnnysix.net/games/zzzomo/preview.gif" border="0">

Download : www.johnnysix.net/games/zzzomo/zzzomo.zip

Why don't you just add a physics behavior to the blocks?

See the result

Download the project

Yeah, I tried physics and platform movement (with controls disabled), however neither acted in a very controlled manner - platform slowed the game dramatically, and physics causes the whole building to fall over.

I've got a newer version working here, with winning/losing - I've now encountered a few new problems as demonstrated in this video :

When the 'level1' layout is loaded via "goto layout" event, the aliens respawn but the buildings etc don't, it's rather odd.

New game version here :

http://www.johnnysix.net/games/imd/

Then, another thing you should do would be like this:

1) create a imagepoint at the bottom of each block, called BOTTOM;

2) check collision of each block BOTTOM to another block;

3) then create a event: when block BOTTOM is not colliding with another block then set block Y + 1;

Let me know if it works! :)

Cool - will give that a try tonight - didn't think you could check for imagepoint overlays.

BTW - when going back to a layout, is there a way to reset it?

When I trigger the level1 layour again, it only spawns the monsters - see the latest example - if you lose.

Well, basically when you "Goto Layout" and set the same layout it would works. But don�t forget the global variables, you should also reset them, use the system expression Reset Global Variables for that!

Is there a difference between setting global variables in say - the "loading/title screen" layout and "level 1" layout?

Just wondering what best practices is, I already messed up making things like the plane global objects, thinking if I were to reuse them on level2, level3 etc - they would keep the same properties.