commit 439f4859b853006aab7877c4fcc3b9f49f748043
Author: Sameer Puri <noreply@github.com>
Date:   Sat Apr 20 18:51:50 2019 -0500

    Initial commit

diff --git a/.gitignore b/.gitignore
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diff --git a/README.md b/README.md
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+# L-systems in Rust
+
+Renderings of various L-systems using Rust and Cairo.
+
+## Sierpinski Triangle
+![sierpinski](out/sierpinski.svg)
+
+## Sierpinski Arrowhead
+![arrowhead](out/arrowhead.svg)
+
+## Koch Curve
+![koch](out/koch.svg)
+
+## Dragon Curve
+![dragon](out/dragon.svg)
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+</g>
+</svg>
diff --git a/out/sierpinski.svg b/out/sierpinski.svg
new file mode 100644
index 0000000..f0ed46e
--- /dev/null
+++ b/out/sierpinski.svg
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="1024pt" height="1024pt" viewBox="0 0 1024 1024" version="1.1">
+<g id="surface6">
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+</svg>
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..8a1ad64
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,119 @@
+extern crate cairo;
+
+use cairo::{svg, Context};
+use std::fs::File;
+use std::io::Write;
+
+fn main() {
+    koch();
+    sierpinski();
+    arrowhead();
+    dragon();
+}
+
+fn koch() {
+    let mut out = File::create("koch.svg").unwrap();
+    run(
+        "F",
+        &['F'],
+        |c: char| match c {
+            'F' => "F+F-F-F+F".chars().collect(),
+            other => vec![other],
+        },
+        std::f64::consts::PI / 2.,
+        4,
+        &mut out,
+    );
+}
+
+fn sierpinski() {
+    let mut out = File::create("sierpinski.svg").unwrap();
+    run(
+        "F-G-G",
+        &['F', 'G'],
+        |c: char| match c {
+            'F' => "F-G+F+G-F".chars().collect(),
+            'G' => "GG".chars().collect(),
+            other => vec![other],
+        },
+        std::f64::consts::PI * 2. / 3.,
+        4,
+        &mut out,
+    );
+}
+
+fn arrowhead() {
+    let mut out = File::create("arrowhead.svg").unwrap();
+    run(
+        "A",
+        &['A', 'B'],
+        |c: char| match c {
+            'A' => "B-A-B".chars().collect(),
+            'B' => "A+B+A".chars().collect(),
+            other => vec![other],
+        },
+        std::f64::consts::PI * 1. / 3.,
+        4,
+        &mut out,
+    );
+}
+
+fn dragon() {
+    let mut out = File::create("dragon.svg").unwrap();
+    run(
+        "FX",
+        &['F'],
+        |c: char| match c {
+            'X' => "X+YF+".chars().collect(),
+            'Y' => "-FX-Y".chars().collect(),
+            other => vec![other],
+        },
+        std::f64::consts::PI / 2.,
+        10,
+        &mut out,
+    );
+}
+
+fn run<F, W>(axiom: &str, variables: &[char], rules: F, angle: f64, iterations: usize, writer: W)
+where
+    F: Fn(char) -> Vec<char> + Copy,
+    W: Write,
+{
+    let surf = svg::Writer::new(1024.0, 1024.0, writer);
+    let ctx = Context::new(&surf);
+    ctx.scale(1024., 1024.);
+
+    ctx.set_line_width(0.001);
+    ctx.set_source_rgb(0., 0., 0.);
+
+    let mut state = axiom.to_string();
+
+    for _ in 0..iterations {
+        state = state.chars().map(rules).flatten().collect();
+    }
+
+    // let segment_count = state.chars().filter(|c| variables.contains(&c)).count();
+
+
+    ctx.move_to(0.0, 0.5);
+    for c in state.chars() {
+        match c {
+            '+' => {
+                ctx.rotate(-angle);
+            }
+            '-' => {
+                ctx.rotate(angle);
+            }
+            other => {
+                if variables.contains(&other) {
+                    ctx.rel_line_to(0.01, 0.0);
+                }
+            }
+        }
+    }
+    ctx.stroke();
+
+    // let mut fout = File::create("out.png").unwrap();
+    // surf.write_all(&mut fout).unwrap();
+    // println!("{}", axiom);
+}