What do you mean by explosion?
IHMO i can see 2 types of 'explosion'
1) particle-like explosions
| 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 + 10.0*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 !! 
