Quick question about PLACE_MEETING() [RESOLVED]

[oldnoob]

Dear all,

May I just verify how place_meeting works please (I haven't found a definitive answer online).

Assuming a player's sprite (32x32) origin is top-left and you check for place_meeting(x,y+1,obj_block), does it just check the pixel below obj_player (at Y 33) or all pixels from 1-33 (not including 0, obvs!).

In short, would both scenarios in the image below return true?

I think the answer is all pixels from 1-33 as they're the results I've seen, but I'd really appreciate clarification of this please.

Many thanks in advance.

 

[TsukaYuriko]

It uses the instances' collision masks, with the calling instance's mask placed at the indicated position. If the masks overlap, it returns true.

 

[oldnoob]

Ahh I see - I'm thinking about this the wrong way. It moves the instance by the specified amount and then checks the collision mask of both instances. In my head, I had it checking individual pixels specified in the x,y coords.

Thank you. I think I;m too old-school for this new fangled way of doing things.


Old Noob.

 

[RichHopefulComposer]

@oldnoob: Check out collision_rectangle and bbox_left/right/etc. You might like them more.

There are a bunch of collision functions in the manual, actually. Worth a look!

 

[FrostyCat]

@oldnoob:

You should learn the difference between the various collision functions and what each checks for, in particular place vs. position and meeting vs. instance.