explosions code WANTED

William Labbett

hi chaps

i'm hoping someone out there has got some simple code using allegro functions for doing explosions.

I just want it for the opening of my game - lots of explosions then the game's opening picture fading through.

I will include thanks to the person in the credits of my game, but there'll be no other reward - my game'll be freeware anyway!

Thanks for any help.

Inphernic

Either use an explosion animation or particles. Or both. The code itself is trivial, so why not have a shot at it yourself? You'll learn better that way, too.

anto80

What do you mean by explosion?

IHMO i can see 2 types of 'explosion'
1) particle-like explosions

1typedef struct Particle{
2   float x, y;   // instant pos
3   float dx, dy; // instant vector
4   float ay;     // acceleration (gravity)
5}Particle;
6 
7void move_particle(Particle* p){
8   p->x += p->dx;
9   p->y += p->dy;
10   p->dy += p->ay;
11}
12 
13void spawn_particles(ParticleList* pl, int n, float x, float y){
14   int i;
15   Particle p;
16   for(i=0; i<n; i++){
17      p.set(x + 10.0*cos(i*2*M_PI/n),  // x
18            y + 10.0*sin(i*2*M_PI/n),  // y
19            1.0*cos(i*2*M_PI/n),       // dx
20            1.0*sin(i*2*M_PI/n),       // dy
21            0.8);                      // ay
22      pl->addParticle(&p);
23   }
24}

2) sprite explosions
Create a dozen of explosion sprite to do an animation.
Display them in this order.
If you want it to look more like a real explosion, use transparency.
If you want it to look even more like a real explosion, use smoke (for example smoke sprites, like your explosion sprites).
If you want it to look further more like a real explosion, combine this with particles (1).

That's what i do.
I hope it helps.

[edit]damn!! Inphernic beat me !!

A J

do some particles, with trails (x-fade the previous screen with the current one).
or just get a FLIC of an explosion and play that.

William Labbett

big Thank-you to Anto80

anto80

You're welcome!!

It's very kind of you to give my name in your credits, but i can't accept because as Inphernic said, the code is so trivial we can't tell it belongs to anyone...

Thanks anyway.

If you still want to put my name on it, i wouldn't say no!

And please tell us about your project revision, so that we can see the result of these great particles! 8-)

OICW

The good particle explosion system is in demo.c I think it pregenerates some number of frames of an explosion using particles and then it draws it on screen when needed.

ReyBrujo

Shawn wrote EGG, a program to prerender explosions. You should check it out.

Avenger

EGG was not only for explosions, but other particle related things too (Spaceship engine, sparks, etc.)

Thread #415131. Printed from Allegro.cc

1	typedef struct Particle{
2	float x, y; // instant pos
3	float dx, dy; // instant vector
4	float ay; // acceleration (gravity)
5	}Particle;
6
7	void move_particle(Particle* p){
8	p->x += p->dx;
9	p->y += p->dy;
10	p->dy += p->ay;
11	}
12
13	void spawn_particles(ParticleList* pl, int n, float x, float y){
14	int i;
15	Particle p;
16	for(i=0; i<n; i++){
17	p.set(x + 10.0cos(i2*M_PI/n), // x
18	y + 10.0sin(i2*M_PI/n), // y
19	1.0cos(i2*M_PI/n), // dx
20	1.0sin(i2*M_PI/n), // dy
21	0.8); // ay
22	pl->addParticle(&p);
23	}
24	}