Is an obstacle?

[Storsorgen]

Hello!
I noticed in the tutorial about fastloops, that the writer has made a line that goes:

X Left("Enemy")-7, Y Bottom("Enemy")+3 is an obstacle

If I understand this right, you can check a designated position and see if that position is overlapping an obstacle, without moving the object there first?
I tried using the "is an obstacle" line myself, but it didn't register as valid. Did I understand this expression correct?

[Popcorn]

Yes, you understood that correctly. You have to make sure that the backdrop you are testing on is set to 'obstacle' in its Runtime property settings. You also need to know where the hotspot of the Active object is located, as the hotspot is the position it tests for.

[Storsorgen]

Alright, but how do you formulate it?
I tried Check X of Active
X("Active") = X("Active")+10 is an obstacle

But it doesn't work?

[Popcorn]

Use collision mask as the condition, you don't need to compare it with anything else.

* X("Active")+10 is an obstacle
- Do something

Of course, you will also need to input the y-position, so it will look something like:

* X( "Active" )+10, Y( "Active" ) is an obstacle

[Storsorgen]

I'm afraid I don't understand the part " use collision mask as the condition". How do I do that?

[Popcorn]

Create a new event / condition by clicking Insert in the event editor.
Then do as on the picture.

isObstacle.jpg

[Storsorgen]

Ah, thank you very much! I had no idea this could be done!

[Popcorn]

You're welcome!

[SteveM]

Thank You! I was trying to follow the tutorial as well and I would have never known it was the collision mask until you said so. The tutorial is great but it needs to be rewritten for total noobs like me who still don't quite know the ins and outs of this great program yet!