Graal Forums - TGC's School of Script: Emitters

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TGC's School of Script: Emitters

Okay. About time I shared my newfound and dearly loved knowledge on emitters. (This is an extremely long post, but read it if you want to learn Particle Emitters through and through, and yes I will start from the beginning).

First off, new function, we will need this for the Emitters:

PHP Code:


		
			
findimg(index)

This function can be used for the following script:

PHP Code:


		
			
//#CLIENTSIDE

function onCreated() {

  showimg(1,"block.png",player.x,player.y);

  findimg(1).x = player.x - 5;

  with (findimg(1)) {

    mode = 1;

    red = 1;

    blue = 0;

    green = .5;

  }

}

In short, findimg(index) works exactly like findplayer(index), and can be used in much the same way, but relative to images, and not a player. :D
Important notes before we start:

Indefined images have an image of "" (A blank string)
Undefined images have an x and y equal to the player's x and y

Now, onto Particle Emitters!!

A particle emitter is an object. Just like 'player.' or 'this.', it is an object. It's parent is the TShowImg, which is the showimg object. First off, you do not need to define an image to cast an emitter on it. in fact, I did not and I made some pretty nice and simple emitters. (Attached is a preview of what I have made, and that's on Babylon). Now, the 'emitter.' object is how we access and create an emitter. First off, the basics:

PHP Code:


		
			
//#CLIENTSIDE

function onCreated() {

  with (findimg(1)) {

    layer = 2; // This will make the emitter draw under the player

    x = player.x;

    y = player.y; // These will show the emitter at the player's coords.

Follow along with what I'm doing? Now, here are the variables we will need to define, after setting the layer, x, and y, still inside the findimg() bracket:

PHP Code:


		
			
emitter.delaymin = float; // This is the minimum delay between emissions

emitter.delaymax = float; // This is the maximum delay between emissions, both of these are in seconds

emitter.emissionoffset = string; // In format of "{float, float, float}", it's the offset from the x, y, and z that an emission will show. It's the delta variables for the location, basically.

emitter.nrofparticles = integer; // The number of particles to be released at the same exact time when the emitter emits. For example, set this to two, and you'll have two particles released every time instead of the default 1

There. Define those as you wish. I have the mindelay as .01 and the max as .05. The offset I have as {.5,0,0}, which places the left edge of the emitters .5 tiles to the right. Now, time to teach how to change the particle attributes, and not just the base laws that govern them.

PHP Code:


		
			
emitter.particle.lifetime = float; // How long, in seconds, the emitter lasts.

emitter.particle.image = string; // The imagename of the emitter

emitter.particle.mode = integer; // Either 0, 1, or 2, the same as changeimgmode

emitter.particle.alpha = float; // Between 0 and 1, the alpha colour for transparancy

emitter.particle.zoom = float; // The zoom effect of the particle

emitter.particle.red = float;

emitter.particle.green = float;

emitter.particle.blue = float; // These three are between 0 and 1, and they're the colours of the individual particles



emitter.particle.zangle = float; // Between 0 and pi*2, it's the upward angle of the particles. Remember zangle from the shoot() function? Same basic idea.

emitter.particle.angle = float; // Again, between 0 and pi*2, it's the angle that the particle should flow.

emitter.particle.speed = float; // I'm not sure if this is measured in Tiles per second or what, but it's the speed. Higher = faster, obviously

emitter.particle.stretchy = float; // Remember elipses from your Advanced Algebra class? The eccentricity? Remember that? This is it! Yay. Values less than 1 stretch it horizontally, while values more than 1 stretch the image vertically. Fun, fun.

Now time to close the code!

PHP Code:

There.

Well, I hope that taught you a thing or two about emitters! <3, and attached is the picture of what I've done with my emitter images. Note: You'll have to change the image's x and y to the player's x and y inside a timeout loop if you want the emitter to follow the player, as I have it.

Have fun!

EDIT: I left out the things I, myself, don't fully understand. Sorry. z-z

You totally forgot about local and global modifiers. You will need those if you want to make nice effects with the particle engine. =/

Then tell us about local and global modifiers.
TGC doesn't have Stefan's particle system script to look at for reference.

Quote:

Originally Posted by ChibiChibiLuc

TGC doesn't have Stefan's particle system script to look at for reference.

Now he does.

Quote:

Originally Posted by ChibiChibiLuc

Then tell us about local and global modifiers.
TGC doesn't have Stefan's particle system script to look at for reference.

Yeah I did Yen, it was in Alex's NPC. I just now learned what they can do, so I didn't include it in my post.

I won't post them now because I don't know the difference between a LocalModifier and a GlobalModifier. Ajira gave me an idea, but until he gets an answer from Stefan or I find a way to verify his idea, I won't include them.

"omgomgomg breaks of rule #2 ! delet plx !"
:rolleyes:

way to go, TGC!
keep up the good work
I'll be besting you shortly when i can log on again ;)
(and have time to play with them -.-)

Edit:

Quote:

Originally Posted by ForgottenLegacy

Indefined

might want to fix that :p

Quote:

Originally Posted by calani

"omgomgomg breaks of rule #2 ! delet plx !"
:rolleyes:

Stop doing that please =/
Besides, it doesn't break the rule. He gave the basis of a script, not an actual script, and it was just for educational purposes anyway.

Yeah
Please keep up the good work guys
you give slow retarded scripters like me a fair chance at good NAT'ing
<3

Quote:

Originally Posted by Gamba_Legend

you give slow retarded scripters like me a fair chance at good NAT'ing

hehe

Quote:

Originally Posted by Ajira

Stop doing that please =/
Besides, it doesn't break the rule. He gave the basis of a script, not an actual script, and it was just for educational purposes anyway.

Seriously, if I posted something like that, it would likely get deleted for the same reason as the last three: supposedly breaking rule #2 with script(s) that demonstrated how to do something with a non-working, bare-bones script.

Rule two states I cannot give a full and complete working script that a person can copy and paste, to solve their problem.

I didn't do that. I gave every aspect of a system, every aspect I understood at that moment, in an effort to teach people about a brand new system that I like. Now, I do think I'm able to post whole scripts as 'donations' to the Grawl public, but I'm not sure. Am I allowed to do that? (If so, I might end up having a few gifts for you guys ^_~)

It's also illegal to harass players and use RC to give out player's IPs...
But nobody cares, do they? ;)

Its also apparently illegal to post broken and incomplete scripts that appear to be complete :whatever: