Add new images

README.md

@@ -1,6 +1,6 @@
 # L-systems in Rust
 
-Renderings of various L-systems using Rust and Cairo.
+Renderings of various L-systems using Rust and Cairo. Special thanks goes to [Paul Bourke](http://paulbourke.net/fractals/lsys/) and the [L-systems Wikipedia page](https://en.wikipedia.org/wiki/L-system) for the systems below
 
 ## Sierpinski Triangle
 ![sierpinski](out/sierpinski.svg)
@@ -13,3 +13,27 @@ Renderings of various L-systems using Rust and Cairo.
 
 ## Dragon Curve
 ![dragon](out/dragon.svg)
+
+## Fractal Plant (Wikipedia)
+![plant](out/plant.svg)
+
+## Moore Curve
+![moore](out/moore.svg)
+
+## Hilbert Curve
+![hilbert](out/hilbert.svg)
+
+## Sierpinski Carpet
+![sierpinski_capret](out/sierpinski_carpet.svg)
+
+## Koch Snowflake
+![snowflake](out/snowflake.svg)
+
+## Hexagonal Gosper
+![gosper](out/gosper.svg)
+
+## Kolam
+![kolam](out/kolam.svg)
+
+## Crystal
+![crystal](out/crystal.svg)

out/kolam.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="surface51">
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+</g>
+</svg>

out/sierpinski.svg

@@ -1,6 +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">
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 </svg>

src/main.rs

@@ -9,10 +9,18 @@ fn main() {
     sierpinski();
     arrowhead();
     dragon();
+    plant();
+    moore();
+    hilbert();
+    sierpinski_carpet();
+    snowflake();
+    gosper();
+    kolam();
+    crystal();
 }
 
 fn koch() {
-    let mut out = File::create("koch.svg").unwrap();
+    let mut out = File::create("out/koch.svg").unwrap();
     run(
         "F",
         &['F'],
@@ -27,7 +35,7 @@ fn koch() {
 }
 
 fn sierpinski() {
-    let mut out = File::create("sierpinski.svg").unwrap();
+    let mut out = File::create("out/sierpinski.svg").unwrap();
     run(
         "F-G-G",
         &['F', 'G'],
@@ -43,7 +51,7 @@ fn sierpinski() {
 }
 
 fn arrowhead() {
-    let mut out = File::create("arrowhead.svg").unwrap();
+    let mut out = File::create("out/arrowhead.svg").unwrap();
     run(
         "A",
         &['A', 'B'],
@@ -53,13 +61,13 @@ fn arrowhead() {
             other => vec![other],
         },
         std::f64::consts::PI * 1. / 3.,
-        4,
+        6,
         &mut out,
     );
 }
 
 fn dragon() {
-    let mut out = File::create("dragon.svg").unwrap();
+    let mut out = File::create("out/dragon.svg").unwrap();
     run(
         "FX",
         &['F'],
@@ -69,13 +77,146 @@ fn dragon() {
             other => vec![other],
         },
         std::f64::consts::PI / 2.,
-        10,
+        12,
+        &mut out,
+    );
+}
+
+fn plant() {
+    let mut out = File::create("out/plant.svg").unwrap();
+    run(
+        "X",
+        &['F'],
+        |c: char| match c {
+            'X' => "F-[[X]+X]+F[+FX]-X".chars().collect(),
+            'F' => "FF".chars().collect(),
+            other => vec![other],
+        },
+        std::f64::consts::PI * 25.0 / 180.0,
+        5,
+        &mut out,
+    );
+}
+
+fn moore() {
+    let mut out = File::create("out/moore.svg").unwrap();
+    run(
+        "LFL+F+LFL",
+        &['F'],
+        |c: char| match c {
+            'L' => "-RF+LFL+FR-".chars().collect(),
+            'R' => "+LF-RFR-FL+".chars().collect(),
+            other => vec![other],
+        },
+        std::f64::consts::PI * 90.0 / 180.0,
+        5,
         &mut out,
     );
 }
 
-fn run<F, W>(axiom: &str, variables: &[char], rules: F, angle: f64, iterations: usize, writer: W)
-where
+fn hilbert() {
+    let mut out = File::create("out/hilbert.svg").unwrap();
+    run(
+        "A",
+        &['F'],
+        |c: char| match c {
+            'A' => "-BF+AFA+FB-".chars().collect(),
+            'B' => "+AF-BFB-FA+".chars().collect(),
+            other => vec![other],
+        },
+        std::f64::consts::PI / 2.0,
+        6,
+        &mut out,
+    );
+}
+
+fn sierpinski_carpet() {
+    let mut out = File::create("out/sierpinski_carpet.svg").unwrap();
+    run(
+        "F+F+F+F",
+        &['F'],
+        |c: char| match c {
+            'F' => "FF+F+F+F+FF".chars().collect(),
+            other => vec![other],
+        },
+        std::f64::consts::PI / 2.,
+        4,
+        &mut out,
+    );
+}
+
+fn snowflake() {
+    let mut out = File::create("out/snowflake.svg").unwrap();
+    run(
+        "F++F++F",
+        &['F'],
+        |c: char| match c {
+            'F' => "F-F++F-F".chars().collect(),
+            other => vec![other],
+        },
+        std::f64::consts::PI / 3.,
+        4,
+        &mut out,
+    );
+}
+
+fn gosper() {
+    let mut out = File::create("out/gosper.svg").unwrap();
+    run(
+        "XF",
+        &['F'],
+        |c: char| match c {
+            'X' => "X+YF++YF-FX--FXFX-YF+".chars().collect(),
+            'Y' => "-FX+YFYF++YF+FX--FX-Y".chars().collect(),
+            other => vec![other],
+        },
+        std::f64::consts::PI / 3.,
+        4,
+        &mut out,
+    );
+}
+
+fn kolam() {
+    let mut out = File::create("out/kolam.svg").unwrap();
+    run(
+        "-D--D",
+        &['F'],
+        |c: char| match c {
+            'A' => "F++FFFF--F--FFFF++F++FFFF--F".chars().collect(),
+            'B' => "F--FFFF++F++FFFF--F--FFFF++F".chars().collect(),
+            'C' => "BFA--BFA".chars().collect(),
+            'D' => "CFC--CFC".chars().collect(),
+            other => vec![other],
+        },
+        std::f64::consts::PI / 4.0,
+        6,
+        &mut out,
+    );
+}
+
+fn crystal() {
+    let mut out = File::create("out/crystal.svg").unwrap();
+    run(
+        "F+F+F+F",
+        &['F'],
+        |c: char| match c {
+            'F' => "FF+F++F+F".chars().collect(),
+            other => vec![other],
+        },
+        std::f64::consts::PI / 2.,
+        4,
+        &mut out,
+    );
+}
+
+fn run<F, W>(
+    axiom: &str,
+    variables_to_draw: &[char],
+    rules: F,
+    angle: f64,
+    iterations: usize,
+    writer: W,
+) where
     F: Fn(char) -> Vec<char> + Copy,
     W: Write,
 {
@@ -94,26 +235,36 @@ where
 
     // let segment_count = state.chars().filter(|c| variables.contains(&c)).count();
 
-
-    ctx.move_to(0.0, 0.5);
+    ctx.move_to(0.5, 0.5);
+    let mut stack: Vec<((f64, f64), f64)> = vec![];
+    let mut curangle = -std::f64::consts::PI / 2.0;
     for c in state.chars() {
         match c {
             '+' => {
-                ctx.rotate(-angle);
+                // ctx.rotate(angle);
+                curangle += angle;
             }
             '-' => {
-                ctx.rotate(angle);
+                // ctx.rotate(-angle);
+                curangle -= angle;
+            }
+            '|' => {
+                curangle = -curangle;
+            }
+            '[' => {
+                stack.push((ctx.get_current_point(), curangle));
+            }
+            ']' => {
+                let state = stack.pop().unwrap();
+                ctx.move_to((state.0).0, (state.0).1);
+                curangle = state.1;
             }
             other => {
-                if variables.contains(&other) {
-                    ctx.rel_line_to(0.01, 0.0);
+                if variables_to_draw.contains(&other) {
+                    ctx.rel_line_to(0.005 * f64::cos(curangle), 0.005 * f64::sin(curangle));
                 }
             }
         }
     }
     ctx.stroke();
-
-    // let mut fout = File::create("out.png").unwrap();
-    // surf.write_all(&mut fout).unwrap();
-    // println!("{}", axiom);
 }