feat: introduce simple font from asteroid game

Cargo.lock

@@ -29,6 +29,11 @@ dependencies = [
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@@ -1229,8 +1364,11 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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+"checksum proc-macro-error 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "da25490ff9892aab3fcf7c36f08cfb902dd3e71ca0f9f9517bea02a73a5ce38c"
 "checksum proc-macro-error-attr 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)" = "d175bef481c7902e63e3165627123fff3502f06ac043d3ef42d08c1246da9253"
+"checksum proc-macro-error-attr 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "a1be40180e52ecc98ad80b184934baf3d0d29f979574e439af5a55274b35f869"
 "checksum proc-macro-hack 0.5.11 (registry+https://github.com/rust-lang/crates.io-index)" = "ecd45702f76d6d3c75a80564378ae228a85f0b59d2f3ed43c91b4a69eb2ebfc5"
 "checksum proc-macro-nested 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "369a6ed065f249a159e06c45752c780bda2fb53c995718f9e484d08daa9eb42e"
 "checksum proc-macro2 1.0.26 (registry+https://github.com/rust-lang/crates.io-index)" = "a152013215dca273577e18d2bf00fa862b89b24169fb78c4c95aeb07992c9cec"
@@ -1255,6 +1393,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum rustc-demangle 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)" = "6e3bad0ee36814ca07d7968269dd4b7ec89ec2da10c4bb613928d3077083c232"
 "checksum rustc-hash 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "08d43f7aa6b08d49f382cde6a7982047c3426db949b1424bc4b7ec9ae12c6ce2"
 "checksum rustversion 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "b3bba175698996010c4f6dce5e7f173b6eb781fce25d2cfc45e27091ce0b79f6"
+"checksum serde 1.0.125 (registry+https://github.com/rust-lang/crates.io-index)" = "558dc50e1a5a5fa7112ca2ce4effcb321b0300c0d4ccf0776a9f60cd89031171"
 "checksum shlex 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7fdf1b9db47230893d76faad238fd6097fd6d6a9245cd7a4d90dbd639536bbd2"
 "checksum siphasher 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "0b8de496cf83d4ed58b6be86c3a275b8602f6ffe98d3024a869e124147a9a3ac"
 "checksum siphasher 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "cbce6d4507c7e4a3962091436e56e95290cb71fa302d0d270e32130b75fbff27"
@@ -1264,19 +1403,26 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
 "checksum structopt 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "a1bcbed7d48956fcbb5d80c6b95aedb553513de0a1b451ea92679d999c010e98"
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+"checksum strum 0.18.0 (registry+https://github.com/rust-lang/crates.io-index)" = "57bd81eb48f4c437cadc685403cad539345bf703d78e63707418431cecd4522b"
+"checksum strum_macros 0.18.0 (registry+https://github.com/rust-lang/crates.io-index)" = "87c85aa3f8ea653bfd3ddf25f7ee357ee4d204731f6aa9ad04002306f6e2774c"
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Cargo.toml

@@ -17,7 +17,7 @@ maintenance = { status = "actively-developed" }
 exclude = [ "shell.nix", "default.nix" ]
 
 [dependencies]
-cairo-rs = { version = "0.8", features = [ "png", "svg"] }
+cairo-rs = { version = "0.9", features = [ "png", "svg" ] }
 geo = "0.16"
 geo-clipper = "0.4.0"
 geo-svg-io = "0.1.1"

examples/clipping.rs

@@ -37,6 +37,7 @@ fn main() {
     context.draw_multipolygon(union);
 
     // intersection
+    context.save();
     context.translate(0.0, 250.);
     let intersection = &polygon_a.intersection(&polygon_b, 10.0);
     context.draw_multipolygon(intersection);
@@ -51,7 +52,6 @@ fn main() {
     context.translate(0., 250.);
     let difference = &polygon_b.difference(&polygon_a, 10.0);
     context.draw_multipolygon(difference);
-    context.restore();
 
     context.render();
 }

examples/font.rs

@@ -0,0 +1,47 @@
+//! Shows how to use buildin font
+
+use geo::line_string;
+use polygon_art::{AsteroidFont, Context, FontDirection};
+use FontDirection::{LeftRight, TopDown};
+
+fn main() {
+    let context = Context::create();
+    context.save();
+
+    context.translate(70., 50.);
+    // context.scale(8.);
+
+    let font = AsteroidFont::new();
+    let line = font.get_text("Hey there!".to_string(), 12., LeftRight);
+    for char in line.iter() {
+        context.draw_line_string(char);
+    }
+    context.draw_line_string(&line_string![(x : 0., y:14.), (x: 1000. , y : 14.)]);
+
+    context.translate(0.0, 18.);
+    let line = font.get_text("How are you?".to_string(), 22., LeftRight);
+    for char in line.iter() {
+        context.draw_line_string(char);
+    }
+
+    context.translate(0.0, 28.);
+    let line = font.get_text("Here a bitter text!".to_string(), 50., LeftRight);
+    for char in line.iter() {
+        context.draw_line_string(char);
+    }
+
+    context.translate(0.0, 56.);
+    let line = font.get_text("0123456789".to_string(), 50., LeftRight);
+    for char in line.iter() {
+        context.draw_line_string(char);
+    }
+
+    context.restore();
+    context.translate(30., 50.);
+    let line = font.get_text("0123456789".to_string(), 30., TopDown);
+    for char in line.iter() {
+        context.draw_line_string(char);
+    }
+
+    context.render();
+}

examples/svg.rs

@@ -43,6 +43,5 @@ fn main() {
         renderer.draw_multipolygon(&svg);
     }
 
-    renderer.restore();
     renderer.render();
 }

shell.nix

@@ -12,6 +12,7 @@ pkgs.mkShell {
 
     clang
     llvm
+    pkg-config
 
     (pkgs.writers.writeBashBin "reformat" ''
       for file in `find ${toString ./.} -type f | egrep "\.rs$"`
@@ -24,7 +25,8 @@ pkgs.mkShell {
   # run this on start
   # -----------------
   shellHook = ''
-    export NIX_ENFORCE_PURITY=0
+    # export NIX_ENFORCE_PURITY=0
+
     # Needed so bindgen can find libclang.so
     export LIBCLANG_PATH="${pkgs.llvmPackages.libclang}/lib";
   '';

src/bin/asteroids.rs

@@ -71,6 +71,7 @@ fn main() {
         .scale_to_width(ship_length)
         .translate_center()
         .rotate(rotation as f64);
+    context.save();
     context.translate_center();
     context.draw_multipolygon(&ship);
     context.restore();

src/context.rs

@@ -32,6 +32,11 @@ impl Context {
         ]
     }
 
+    /// a fall back operation, if you need a function not provided by this struct.
+    pub fn cairo_context(&self) -> &cairo::Context {
+        self.render_container.context()
+    }
+
     pub fn draw_multipolygon(&self, multi_polygon: &MultiPolygon<f64>) {
         for polygon in multi_polygon.iter() {
             self.draw_polygon(polygon);
@@ -39,13 +44,13 @@ impl Context {
     }
 
     pub fn draw_polygon(&self, polygon: &Polygon<f64>) {
-        self.plot_line_string(polygon.exterior());
+        self.draw_line_string(polygon.exterior());
         for interior in polygon.interiors() {
-            self.plot_line_string(interior);
+            self.draw_line_string(interior);
         }
     }
 
-    fn plot_line_string(&self, line_string: &LineString<f64>) {
+    pub fn draw_line_string(&self, line_string: &LineString<f64>) {
         let context = self.render_container.context();
         let mut init = true;
         for point in line_string.clone().into_points() {
@@ -64,10 +69,13 @@ impl Context {
         self.render_container.context().restore();
     }
 
+    /// save state to restore later again
+    pub fn save(&self) {
+        self.render_container.context().save();
+    }
     /// scale, but line with stays
     pub fn scale(&self, factor: f64) {
         let context = self.render_container.context();
-        context.save();
         context.scale(factor, factor);
         context.set_line_width(1. / factor);
     }
@@ -80,7 +88,6 @@ impl Context {
     /// translate to a position
     pub fn translate(&self, tx: f64, ty: f64) {
         let context = self.render_container.context();
-        context.save();
         context.translate(tx, ty);
     }
 

src/font.rs

@@ -0,0 +1,133 @@
+// props to https://trmm.net/Asteroids_font
+// https://github.com/osresearch/vst/blob/master/teensyv/asteroids_font.c
+
+use geo::algorithm::translate::Translate;
+use geo::{Coordinate, LineString};
+use std::collections::HashMap;
+
+pub struct AsteroidFont {
+    letters: HashMap<char, Vec<Vec<(i32, i32)>>>,
+}
+
+impl AsteroidFont {
+    #[rustfmt::skip]
+    pub fn new() -> Self {
+      let mut letters = HashMap::new();
+      letters.insert('0', vec![vec![(0, 0), (8, 0), (8, 12), (0, 12), (0, 0), (8, 12)]]);
+      letters.insert('1', vec![vec![(4, 0), (4, 12), (3, 10)]]);
+      letters.insert('2', vec![vec![(0, 12), (8, 12), (8, 7), (0, 5), (0, 0), (8, 0)]]);
+      letters.insert('3', vec![vec![(0, 12), (8, 12), (8, 0), (0, 0), ], vec![(0, 6), (8, 6)]]);
+      letters.insert('4', vec![vec![(0, 12), (0, 6), (8, 6), ], vec![(8, 12), (8, 0)]]);
+      letters.insert('5', vec![vec![(0, 0), (8, 0), (8, 6), (0, 7), (0, 12), (8, 12)]]);
+      letters.insert('6', vec![vec![(0, 12), (0, 0), (8, 0), (8, 5), (0, 7)]]);
+      letters.insert('7', vec![vec![(0, 12), (8, 12), (8, 6), (4, 0)]]);
+      letters.insert('8', vec![vec![(0, 0), (8, 0), (8, 12), (0, 12), (0, 0), ], vec![(0, 6), (8, 6)]]);
+      letters.insert('9', vec![vec![(8, 0), (8, 12), (0, 12), (0, 7), (8, 5)]]);
+      letters.insert(' ', vec![]);
+      letters.insert('.', vec![vec![(3, 0), (4, 0)]]);
+      letters.insert(',', vec![vec![(2, 0), (4, 2)]]);
+      letters.insert('-', vec![vec![(2, 6), (6, 6)]]);
+      letters.insert('+', vec![vec![(1, 6), (7, 6), ], vec![(4, 9), (4, 3)]]);
+      letters.insert('!', vec![vec![(4, 0), (3, 2), (5, 2), (4, 0), ], vec![(4, 4), (4, 12)]]);
+      letters.insert('#', vec![vec![(0, 4), (8, 4), (6, 2), (6, 10), (8, 8), (0, 8), (2, 10), (2, 2)]]);
+      letters.insert('^', vec![vec![(2, 6), (4, 12), (6, 6)]]);
+      letters.insert('=', vec![vec![(1, 4), (7, 4), ], vec![(1, 8), (7, 8)]]);
+      letters.insert('*', vec![vec![(0, 0), (4, 12), (8, 0), (0, 8), (8, 8), (0, 0)]]);
+      letters.insert('_', vec![vec![(0, 0), (8, 0)]]);
+      letters.insert('/', vec![vec![(0, 0), (8, 12)]]);
+      letters.insert('\\', vec![vec![(0, 12), (8, 0)]]);
+      letters.insert('@', vec![vec![(8, 4), (4, 0), (0, 4), (0, 8), (4, 12), (8, 8), (4, 4), (3, 6)]]);
+      letters.insert('$', vec![vec![(6, 2), (2, 6), (6, 10), ], vec![(4, 12), (4, 0)]]);
+      letters.insert('&', vec![vec![(8, 0), (4, 12), (8, 8), (0, 4), (4, 0), (8, 4)]]);
+      letters.insert('[', vec![vec![(6, 0), (2, 0), (2, 12), (6, 12)]]);
+      letters.insert(']', vec![vec![(2, 0), (6, 0), (6, 12), (2, 12)]]);
+      letters.insert('(', vec![vec![(6, 0), (2, 4), (2, 8), (6, 12)]]);
+      letters.insert(')', vec![vec![(2, 0), (6, 4), (6, 8), (2, 12)]]);
+      letters.insert('{', vec![vec![(6, 0), (4, 2), (4, 10), (6, 12), ], vec![(2, 6), (4, 6)]]);
+      letters.insert('}', vec![vec![(4, 0), (6, 2), (6, 10), (4, 12), ], vec![(6, 6), (8, 6)]]);
+      letters.insert('%', vec![vec![(0, 0), (8, 12), ], vec![(2, 10), (2, 8), ], vec![(6, 4), (6, 2)]]);
+      letters.insert('<', vec![vec![(6, 0), (2, 6), (6, 12)]]);
+      letters.insert('>', vec![vec![(2, 0), (6, 6), (2, 12)]]);
+      letters.insert('|', vec![vec![(4, 0), (4, 5), ], vec![(4, 6), (4, 12)]]);
+      letters.insert(':', vec![vec![(4, 9), (4, 7), ], vec![(4, 5), (4, 3)]]);
+      letters.insert(';', vec![vec![(4, 9), (4, 7), ], vec![(4, 5), (1, 2)]]);
+      letters.insert('"', vec![vec![(2, 10), (2, 6), ], vec![(6, 10), (6, 6)]]);
+      letters.insert('\'', vec![vec![(2, 6), (6, 10)]]);
+      letters.insert('`', vec![vec![(2, 10), (6, 6)]]);
+      letters.insert('~', vec![vec![(0, 4), (2, 8), (6, 4), (8, 8)]]);
+      letters.insert('?', vec![vec![(0, 8), (4, 12), (8, 8), (4, 4), ], vec![(4, 1), (4, 0)]]);
+      letters.insert('a', vec![vec![(0, 0), (0, 8), (4, 12), (8, 8), (8, 0), ], vec![(0, 4), (8, 4)]]);
+      letters.insert('b', vec![vec![(0, 0), (0, 12), (4, 12), (8, 10), (4, 6), (8, 2), (4, 0), (0, 0)]]);
+      letters.insert('c', vec![vec![(8, 0), (0, 0), (0, 12), (8, 12)]]);
+      letters.insert('d', vec![vec![(0, 0), (0, 12), (4, 12), (8, 8), (8, 4), (4, 0), (0, 0)]]);
+      letters.insert('e', vec![vec![(8, 0), (0, 0), (0, 12), (8, 12), ], vec![(0, 6), (6, 6)]]);
+      letters.insert('f', vec![vec![(0, 0), (0, 12), (8, 12), ], vec![(0, 6), (6, 6)]]);
+      letters.insert('g', vec![vec![(6, 6), (8, 4), (8, 0), (0, 0), (0, 12), (8, 12)]]);
+      letters.insert('h', vec![vec![(0, 0), (0, 12), ], vec![(0, 6), (8, 6), ], vec![(8, 12), (8, 0)]]);
+      letters.insert('i', vec![vec![(0, 0), (8, 0), ], vec![(4, 0), (4, 12), ], vec![(0, 12), (8, 12)]]);
+      letters.insert('j', vec![vec![(0, 4), (4, 0), (8, 0), (8, 12)]]);
+      letters.insert('k', vec![vec![(0, 0), (0, 12), ], vec![(8, 12), (0, 6), (6, 0)]]);
+      letters.insert('l', vec![vec![(8, 0), (0, 0), (0, 12)]]);
+      letters.insert('m', vec![vec![(0, 0), (0, 12), (4, 8), (8, 12), (8, 0)]]);
+      letters.insert('n', vec![vec![(0, 0), (0, 12), (8, 0), (8, 12)]]);
+      letters.insert('o', vec![vec![(0, 0), (0, 12), (8, 12), (8, 0), (0, 0)]]);
+      letters.insert('p', vec![vec![(0, 0), (0, 12), (8, 12), (8, 6), (0, 5)]]);
+      letters.insert('q', vec![vec![(0, 0), (0, 12), (8, 12), (8, 4), (0, 0), ], vec![(4, 4), (8, 0)]]);
+      letters.insert('r', vec![vec![(0, 0), (0, 12), (8, 12), (8, 6), (0, 5), ], vec![(4, 5), (8, 0)]]);
+      letters.insert('s', vec![vec![(0, 2), (2, 0), (8, 0), (8, 5), (0, 7), (0, 12), (6, 12), (8, 10)]]);
+      letters.insert('t', vec![vec![(0, 12), (8, 12), ], vec![(4, 12), (4, 0)]]);
+      letters.insert('u', vec![vec![(0, 12), (0, 2), (4, 0), (8, 2), (8, 12)]]);
+      letters.insert('v', vec![vec![(0, 12), (4, 0), (8, 12)]]);
+      letters.insert('w', vec![vec![(0, 12), (2, 0), (4, 4), (6, 0), (8, 12)]]);
+      letters.insert('x', vec![vec![(0, 0), (8, 12), ], vec![(0, 12), (8, 0)]]);
+      letters.insert('y', vec![vec![(0, 12), (4, 6), (8, 12), ], vec![(4, 6), (4, 0)]]);
+      letters.insert('z', vec![vec![(0, 12), (8, 12), (0, 0), (8, 0), ], vec![(2, 6), (6, 6)]]);
+      AsteroidFont {letters }
+   }
+
+    pub fn get_letter(&self, letter: &char, size: f64) -> Vec<LineString<f64>> {
+        let letter_coordinates = self.letters.get(&letter.to_ascii_lowercase()).unwrap();
+        let mut polygons: Vec<LineString<f64>> = Vec::new();
+        for letter_part in letter_coordinates.iter() {
+            let coordinates: Vec<Coordinate<f64>> = letter_part
+                .iter()
+                .map(|&(x, y)| Coordinate {
+                    x: x as f64 * size / 12.,
+                    y: (12. - y as f64) * size / 12.,
+                })
+                .collect();
+            polygons.push(LineString(coordinates));
+        }
+        polygons
+    }
+
+    pub fn get_text(
+        &self,
+        text: String,
+        size: f64,
+        direction: FontDirection,
+    ) -> Vec<LineString<f64>> {
+        let mut letters: Vec<LineString<f64>> = Vec::new();
+        let mut count = 0.;
+        for char in text.chars() {
+            let letter = self.get_letter(&char, size);
+            for character in letter.iter() {
+                match direction {
+                    FontDirection::LeftRight => {
+                        letters.push(character.translate(count * 10.0 * size / 12., 0.))
+                    }
+                    FontDirection::TopDown => {
+                        letters.push(character.translate(0., count * 14.0 * size / 12.))
+                    }
+                }
+            }
+            count = count + 1.;
+        }
+        letters
+    }
+}
+
+pub enum FontDirection {
+    LeftRight,
+    TopDown,
+}

src/lib.rs

@@ -7,3 +7,7 @@ pub use crate::multipolygon_ext::MultiPolygonExt;
 mod svg;
 pub use crate::svg::load_multipolygon_from_svg;
 pub use crate::svg::load_multipolygon_from_svg_include;
+
+mod font;
+pub use crate::font::AsteroidFont;
+pub use crate::font::FontDirection;