From 8f85bbe5ed5c7a500ec71201c3bfe37908f89ab8 Mon Sep 17 00:00:00 2001
From: Lol3rrr <lol3r@lol3r.net>
Date: Wed, 24 Dec 2025 14:39:11 +0100
Subject: [PATCH] Started on first implementation

---
 Cargo.lock  | 698 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |   2 +
 README.md   |   6 +
 src/lib.rs  | 124 ++++++++++
 src/main.rs | 115 ++++++++-
 5 files changed, 944 insertions(+), 1 deletion(-)
 create mode 100644 Cargo.lock
 create mode 100644 README.md
 create mode 100644 src/lib.rs

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diff --git a/Cargo.toml b/Cargo.toml
index 769ec57..9dc15b1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,3 +4,5 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
+crossterm = "0.29.0"
+ratatui = "0.29.0"
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..750d41e
--- /dev/null
+++ b/README.md
@@ -0,0 +1,6 @@
+# Fluidsim
+A simple 2D fluid simulation
+
+## References
+- [Website from Ten Minute Physics](https://matthias-research.github.io/pages/tenMinutePhysics/17-fluidSim.html)
+- [PDF from Ten Minute Physics](https://matthias-research.github.io/pages/tenMinutePhysics/17-fluidSim.pdf)
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..7f822c3
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,124 @@
+#[derive(Debug, Clone)]
+pub struct Domain {
+    pub width: usize,
+    pub height: usize,
+    pub cells: Vec<(f64, f64)>,
+    pub enabled: Vec<f64>,
+}
+
+impl Domain {
+    pub fn empty(width: usize, height: usize) -> Self {
+        let grid_size = (width+2)*(height*2);
+        let cells = core::iter::repeat_n((0.0, 0.0), grid_size).collect();
+        let mut enabled: Vec<f64> = core::iter::repeat_n(1.0, grid_size).collect();
+
+        for x in 0..width+2 {
+            *enabled.get_mut(x).unwrap() = 0.0;
+            *enabled.get_mut((height+1)*width + x).unwrap() = 0.0;
+        }
+        for y in 0..height+2 {
+            *enabled.get_mut(y*width + 0).unwrap() = 0.0;
+            *enabled.get_mut(y*width + width-1).unwrap() = 0.0;
+        }
+
+        Domain {
+            width,
+            height,
+            cells,
+            enabled
+        }
+    }
+
+    pub fn get_mut(&mut self, x: usize, y: usize) -> Option<&mut (f64, f64)> {
+        self.cells.get_mut((y + 1)*self.width + x + 1)
+    }
+}
+
+pub fn simulate(start: &mut Domain) {
+    let dT: f64 = 1.0 / 30.0;
+
+    for i in 0..25 {
+        for y in 1..start.height-1 {
+            for x in 1..start.width-1 {
+                let own_cell_idx = y * start.width + x;
+                let top_cell_idx = (y-1) * start.width + x;
+                let right_cell_idx = y * start.width + x + 1;
+
+                let own_cell = start.cells.get(own_cell_idx).copied().unwrap();
+                let top_cell = start.cells.get(top_cell_idx).copied().unwrap();
+                let right_cell = start.cells.get(right_cell_idx).copied().unwrap();
+
+                let d = right_cell.0 - own_cell.0 + top_cell.1 - own_cell.1;
+
+                let s_right = start.enabled.get(y*start.width+x+1).copied().unwrap();
+                let s_left = start.enabled.get(y*start.width+x-1).copied().unwrap();
+                let s_top = start.enabled.get((y-1)*start.width+x).copied().unwrap();
+                let s_bot = start.enabled.get((y+1)*start.width+x).copied().unwrap();
+                let total = s_right + s_left + s_top + s_bot;
+
+                start.cells.get_mut(own_cell_idx).unwrap().0 = own_cell.0 + d*(s_left/total);
+                start.cells.get_mut(own_cell_idx).unwrap().1 = own_cell.1 +  d*(s_top/total);
+
+                start.cells.get_mut(right_cell_idx).unwrap().0 = right_cell.0 - d*(s_right/total);
+                start.cells.get_mut(top_cell_idx).unwrap().1 = top_cell.1 - d*(s_bot/total);
+            }
+        }
+    }
+
+    // Advaction
+    simulate_advaction(start, dT);
+}
+
+fn simulate_advaction(start: &mut Domain, dT: f64) {
+    for y in 1..start.height-1 {
+        for x in 1..start.width-1 {
+            let own_cell_idx = y * start.width + x;
+
+            let own_cell = start.cells.get(own_cell_idx).copied().unwrap();
+
+            let u = own_cell.0;
+
+            let v = (own_cell.1 + start.cells.get(y * start.width + x - 1).copied().unwrap().1
+                + start.cells.get((y-1) * start.width + x).copied().unwrap().1
+                + start.cells.get((y-1) * start.width + x - 1).copied().unwrap().1) / 4.0;
+
+            let prev_x = x as f64 + 0.5 - dT*u;
+            let prev_y = y as f64 + 0.5 - dT*v;
+
+            println!("[AD] ({}, {}) --({}, {})--> ({}, {})", x, y, u, v, prev_x, prev_y);
+
+            let cell = (prev_x.round() as usize, prev_y.round() as usize);
+            let cell_left = (cell.0 - 1, cell.1);
+            let cell_left_top = (cell.0 - 1, cell.1 - 1);
+            let cell_top = (cell.0, cell.1 - 1);
+
+            println!("[AD] Right-B {:?} - Left-B {:?} - Right-T {:?} - Left-T {:?}", cell, cell_left, cell_top, cell_left_top);
+
+            let w00 = 1.0 - (prev_x - (cell_left.0 as f64 + 0.5))/1.0;
+            let w01 = (prev_x - (cell_left.0 as f64 + 0.5))/1.0;
+            let w10 = 1.0 - (prev_y - (cell_left.1 as f64 + 0.5))/1.0;
+            let w11 = (prev_y - (cell_left.1 as f64 + 0.5))/1.0;
+            println!("W00 {} - W01 {} - W10 {} - W11 {}", w00, w01, w10, w11);
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn advaction_x_only() {
+        let input = Domain::empty(6, 6);
+
+        let mut target = input.clone();
+
+        target.get_mut(2, 2).unwrap().0 = 1.0;
+
+        println!("{:?}", target);
+        simulate_advaction(&mut target, 0.1);
+        println!("{:?}", target);
+
+        assert!(false);
+    }
+}
diff --git a/src/main.rs b/src/main.rs
index e7a11a9..5ab91bc 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,116 @@
+use crossterm::event::{self, Event};
+use ratatui::{text::Text, Frame, widgets::canvas::Canvas, widgets::canvas::Points, widgets::canvas::Rectangle};
+
+use fluidsim::{Domain, simulate};
+
 fn main() {
-    println!("Hello, world!");
+    let width = 100;
+    let height = 60;
+
+    let mut domain = Domain {
+        width: width + 2,
+        height: height + 2,
+        cells: core::iter::repeat_n((0.0, 0.0), (width+2)*(height+2)).collect(),
+        enabled: core::iter::repeat_n(1.0, (width+2)*(height+2)).collect(),
+    };
+
+    let boundary = 10;
+    for y in boundary..domain.height-boundary {
+        let cell = domain.cells.get_mut(y*domain.width + 1).unwrap();
+        cell.0 = 1.0;
+    }
+    
+    for y in 0..domain.height {
+        *domain.enabled.get_mut(y*domain.width).unwrap() = 0.0;
+        *domain.enabled.get_mut(y*domain.width + domain.width-1).unwrap() = 0.0;
+    }
+    for x in 0..domain.width {
+        *domain.enabled.get_mut(0*domain.width + x).unwrap() = 0.0;
+        *domain.enabled.get_mut((domain.height-1)*domain.width + x).unwrap() = 0.0;
+    }
+
+    let (domain_tx, domain_rx) = std::sync::mpsc::channel();
+    std::thread::spawn(move || {
+        let mut start = domain;
+
+        domain_tx.send(Domain {
+            width: start.width,
+            height: start.height,
+            cells: start.cells.clone(),
+            enabled: start.enabled.clone(),
+        }).unwrap();
+
+        for i in 0.. {
+            // println!("Iteration {}", i);
+
+            simulate(&mut start);
+
+            if i % 100 == 0 {
+                domain_tx.send(Domain {
+                    width: start.width,
+                    height: start.height,
+                    cells: start.cells.clone(),
+                    enabled: start.enabled.clone(),
+                }).unwrap();
+            }
+        }
+
+        std::thread::sleep(std::time::Duration::from_millis(10));
+    });
+
+    let mut domain = domain_rx.recv().unwrap();
+
+    let mut terminal = ratatui::init();
+    loop {
+        domain = match domain_rx.try_recv() {
+            Ok(d) => d,
+            Err(_) => domain,
+        };
+
+        terminal.draw(|frame| {
+            draw(frame, &domain)
+        }).expect("failed to draw frame");
+        match event::read().expect("failed to read event") {
+            Event::Key(k) if k.code == crossterm::event::KeyCode::Esc => {
+                break;
+            }
+            _ => {}
+        };
+    }
+    ratatui::restore();
+}
+
+fn draw(frame: &mut Frame, domain: &Domain) {
+    let canvas = Canvas::default().x_bounds([0.0, domain.width as f64 - 2.0]).y_bounds([0.0, domain.height as f64 - 2.0]).paint(|ctx| {
+        for y in 1..domain.height-1 {
+            for x in 1..domain.width-1 {
+                let own_cell_idx = y * domain.width + x;
+                let top_cell_idx = (y-1) * domain.width + x;
+                let right_cell_idx = y * domain.width + x + 1;
+
+                let own_cell = domain.cells.get(own_cell_idx).unwrap();
+                let top_cell = domain.cells.get(top_cell_idx).unwrap();
+                let right_cell = domain.cells.get(right_cell_idx).unwrap();
+
+                let d = right_cell.0 - own_cell.0 + top_cell.1 - own_cell.1;
+
+                // let text = format!("{:.4}", d);
+                // ctx.print(-0.5 + x as f64, -0.5 + y as f64, text);
+                let color = match d.total_cmp(&0.0) {
+                    core::cmp::Ordering::Less if d.abs() > 0.0001 => ratatui::style::Color::Rgb(255, 0, 0),
+                    core::cmp::Ordering::Greater if d.abs() > 0.0001 => ratatui::style::Color::Rgb(0, 255, 0),
+                    _ => ratatui::style::Color::White,
+                };
+
+                ctx.draw(&Points {
+                    coords: &[(-0.5 + x as f64, -0.5 + y as f64)],
+                    color: color,
+                })
+            }
+        }
+    });
+    frame.render_widget(canvas, frame.area());
+
+    // let text = Text::raw("Hello World!");
+    // frame.render_widget(text, frame.area());
 }