141 lines
4.0 KiB
Rust
141 lines
4.0 KiB
Rust
use std::thread;
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use std::sync::{Arc, RwLock};
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use rand::Rng;
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use std::fs::File;
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use std::io::prelude::*;
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struct Node {
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x: f32,
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y: f32,
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}
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struct Edge {
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weight: f32,
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}
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fn nodes_list(size: usize) -> Arc<Vec<RwLock<Node>>> {
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let mut nodes = Vec::new();
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for _ in 0..size {
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let node = RwLock::new(Node {
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x: rand::thread_rng().gen_range(0.0..100.0),
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y: rand::thread_rng().gen_range(0.0..100.0),
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});
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nodes.push(node);
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}
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Arc::new(nodes)
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}
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fn connection_matrix(size: usize) -> Arc<RwLock<Vec<Vec<Edge>>>> {
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let mut rng = rand::thread_rng();
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let mut matrix = Vec::with_capacity(size);
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for _ in 0..size {
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let mut row = Vec::with_capacity(size);
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for _ in 0..size {
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let p: f32 = rng.gen();
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row.push(Edge { weight: if p < 0.1 {1.0} else {0.0} });
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}
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matrix.push(row);
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}
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Arc::new(RwLock::new(matrix))
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}
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fn main() -> std::io::Result<()> {
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const C_REP: f32 = 0.1;
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const C_SPRING: f32 = 0.1;
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const ITER: usize = 200;
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let size = 5000;
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let threads = 8;
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let nodes = nodes_list(size);
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let nodes_next = nodes_list(size);
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let edges = connection_matrix(size);
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for epoch in 0..ITER {
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let mut handles = vec![];
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let chunks = size / threads;
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for i in 0..threads {
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let nodes = nodes.clone();
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let nodes_next = nodes_next.clone();
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let edges = edges.clone();
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let handle = thread::spawn(move || {
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for j in 0..chunks {
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let n = i * chunks + j;
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let node = nodes[n].read().unwrap();
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let edges = edges.read().unwrap();
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let mut node_x = node.x;
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let mut node_y = node.y;
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for o in 0..size {
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if o == n {
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continue;
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}
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let o_x: f32;
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let o_y: f32;
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{
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let other = nodes[o].read().unwrap();
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o_x = other.x;
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o_y = other.y;
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}
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let d_x = o_x - node_x;
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let d_y = o_y - node_y;
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let dist = (d_x * d_x + d_y * d_y).sqrt().max(0.01);
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let unit_x = d_x / dist;
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let unit_y = d_y / dist;
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let f_rep = C_REP/(dist).powi(2);
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let f_rep_x = f_rep * unit_x;
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let f_rep_y = f_rep * unit_y;
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node_x += f_rep_x;
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node_y += f_rep_y;
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let edge = edges[n][o].weight;
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if edge > 0.0 {
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let f_spring = C_SPRING * (dist / edge).log(2.0);
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let f_spring_x = f_spring * unit_x;
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let f_spring_y = f_spring * unit_y;
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node_x += f_spring_x;
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node_y += f_spring_y;
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}
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}
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let mut result = nodes_next[n].write().unwrap();
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result.x = node_x;
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result.y = node_y;
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}
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});
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handles.push(handle);
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}
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for handle in handles {
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handle.join().unwrap();
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}
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for i in 0..size {
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let mut node = nodes[i].write().unwrap();
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let node_next = nodes_next[i].read().unwrap();
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node.x = node_next.x;
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node.y = node_next.y;
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}
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let mut file = File::create(format!("result/{:04}.txt", epoch))?;
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for i in 0..size {
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let node = nodes[i].read().unwrap();
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// println!("{} {}", node.x, node.y);
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file.write_all(format!("{} {}\n", node.x, node.y).as_bytes())?;
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}
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}
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Ok(())
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}
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