89 lines
2.4 KiB
Rust
89 lines
2.4 KiB
Rust
use rand::Rng;
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use crate::{config::PARTICLE_SCALE, vertex};
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#[derive(Debug, Copy, Clone, Default)]
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pub struct Particle {
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pub position: [f32; 3],
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pub velocity: [f32; 3],
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pub lifetime: f32,
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}
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impl Particle {
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pub fn new(position: [f32; 3], velocity: [f32; 3], lifetime: f32) -> Self {
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Self {
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position,
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velocity,
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lifetime,
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}
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}
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pub fn random_particle() -> Self {
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let mut rng = rand::thread_rng();
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let x = rng.gen_range(-1.0..1.0);
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let y = rng.gen_range(-1.0..1.0);
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let z = rng.gen_range(-1.0..1.0);
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let x_vel = rng.gen_range(-0.001..0.001);
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let y_vel = rng.gen_range(-0.001..0.001);
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let z_vel = rng.gen_range(-0.001..0.001);
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let lifetime = rng.gen_range(0.0..100000000000.0);
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Self {
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position: [x, y, z],
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velocity: [x_vel, y_vel, z_vel],
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lifetime,
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}
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}
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}
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pub fn generate_particle_vertexs(particle_list: &mut Vec<Particle>) -> Vec<vertex::Vertex> {
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let mut shape = Vec::new();
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for particle in particle_list.iter_mut() {
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if particle.lifetime <= 0.0 {
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drop(particle);
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break;
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}
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let vert_1 = vertex::Vertex {
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position: (
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particle.position[0] - PARTICLE_SCALE,
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particle.position[1] + PARTICLE_SCALE,
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particle.position[2],
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),
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};
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let vert_2 = vertex::Vertex {
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position: (
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particle.position[0] + PARTICLE_SCALE,
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particle.position[1] + PARTICLE_SCALE,
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particle.position[2],
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),
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};
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let vert_3 = vertex::Vertex {
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position: (
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particle.position[0] - PARTICLE_SCALE,
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particle.position[1] - PARTICLE_SCALE,
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particle.position[2],
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),
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};
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let vert_4 = vertex::Vertex {
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position: (
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particle.position[0] + PARTICLE_SCALE,
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particle.position[1] - PARTICLE_SCALE,
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particle.position[2],
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),
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};
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shape.append(&mut vec![vert_1, vert_2, vert_3, vert_3, vert_4, vert_2]);
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particle.lifetime -= 0.1;
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particle.position[0] += particle.velocity[0];
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particle.position[1] += particle.velocity[1];
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particle.position[2] += particle.velocity[2];
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}
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shape
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}
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