getBounds(); and collision detection for particles

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getBounds(); and collision detection for particles

(5 posts) (3 voices)

Started 1 year ago by chrisgannon
Latest reply from Daniel

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chrisgannon

Competent Bird
Joined: Feb '12
Posts: 42

Hi all,

I have searched the forums and found some collision detection solutions http://forum.starling-framework.org/topic/collision-detection#post-1420 (using getBounds(); on Image()) but I am not having any luck using the same method on a ParticleDesignerPS object even though that method is available.

I'm doing a simple space shoot 'em up and need the bullets to hit asteroids - the asteroid is a Starling Image(). They are in the same parent container and I have tried to add the particles to a Starling sprite but to no avail.

What am I doing wrong?

Cheers!

Posted 1 year ago #
Daniel

Primary Feather
Joined: Jan '10
Posts: 2,445

Sorry, the particle system always returns empty bounds! (x and y are at the correct place, but width and height always equal zero.)

That's because calculating the bounds of the complete particle system would not make much sense in most particle systems; and there's no way for you to access individual particles.

I recommend you use normal image objects for those objects you want to check for collisions. (Alternatively, you could modify the particle system's code to your needs.)

Posted 1 year ago #
chrisgannon

Competent Bird
Joined: Feb '12
Posts: 42

Cheers Daniel - I think I shall have a hack and a slash

That also answered another question I had about accessing particles - numParticles(); is fine but I was wondering how to dispose of individual ones properly. There seems to be a lot of methods like removeFromParent();, stop(); and dispose(); and I'm never sure which one is actually killing them off properly for garbage collection

Posted 1 year ago #
killerspaz

Competent Bird
Joined: Mar '12
Posts: 32

*bump*

I'm curious about most of this as well...

Would it be feasible to extend both Particle, and ParticleDesignerPS/ParticleSystem to return proper bounds?

Also to dispatch events for particles? I'm thinking secondary explosions from certain types of originating particles/explosions.
A character explodes, pieces of it fly out as originating particles, and wherever those land, an actual explosion of those individual pieces.

Collision detection as well as individual particle access would satisfy my needs...

Just looking for feedback before I go about implementing this.

Posted 1 year ago #
Daniel

Primary Feather
Joined: Jan '10
Posts: 2,445

Well, in theory all of that should be possible to add to the class! As long as the number of particles does not grow too high, it should be feasible to calculate the bounds, or to dispatch events on certain occasions.

I recommend you just try it out! BTW, you could also create your own custom particle system class. If you look at the code, "ParticleDesignerPS" is a subclass of "ParticleSystem". That latter class in itself provides a primitive particle system; you just have to override 2 or 3 methods to implement custom particle movement and creation.

Posted 1 year ago #

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