6 replies to this topic

[Pancratius]

Hello All,

In my code I am creating a collision line. What i wish to do is to get the id of the instance that this line collides with. How do I do this?

I have tried using other, but it returned the object creating the collision line.

Any suggestions?

This is the code I am using:

collision_line(initialpos_x, initialpos_y, self.x+sin(shipdir)*Lscale*36,self.y+cos(shipdir)*Lscale*36, obj_asteroid, 1, 1)

regards,
Pancratius

[dannyjenn]

I have tried using other, but it returned the object creating the collision line.

What object was the code in? Other should return the instance that collides with whatever the code is in... don't know why it would be returning itself...

[Noele]

collision_line returns the instance ID of the other object or noone if there was not one.

inst = collision_line(initialpos_x, initialpos_y, self.x+sin(shipdir)*Lscale*36,self.y+cos(shipdir)*Lscale*36,
 obj_asteroid, 1, 1);
if(inst > 0){
  // inst contains the instance ID of the obj_asteroid
}

[Pancratius]

Thank you Its working now.

Is there a website anywhere that holds all of the GML functions along with what they return etc?
If not I think I may start a document file, and record them as I go.

[Nocturne]

There is the manual... it has all the functions and a general explanation. Press f1 in GM to open it...

[Pancratius]

oh ok, Thank you

[TheouAegis]

And to answer the questions here:

other does not work with collision_line() or collision_rectangle() or any other collisions script. It only works with the Collision EVENTS. collision_line is not an event, it's a function/script, therefor other defaults to the calling instance. This is imporant to remember if you use the with statement. For example, you can use

with(instance_nearest(x,y,my_bullet))
hspeed=other.hspeed+2

This will set the hspeed of the nearest my_bullet to the hspeed of the object that has this script in it.