feat: add asteroids.rs

pool/asteroids/ship1.svg

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   id="svg8"
+   version="1.1"
+   viewBox="0 0 12.7 12.7"
+   height="48"
+   width="48">
+  <defs
+     id="defs2" />
+  <metadata
+     id="metadata5">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <g
+     id="layer1">
+    <path
+       id="path845"
+       d="M 5.9999998,0 2,12 5.9999998,11 10,12 Z"
+       style="fill:none;stroke:#000000;stroke-width:0.264583px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" />
+  </g>
+</svg>

pool/asteroids/ship2.svg

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   id="svg8"
+   version="1.1"
+   viewBox="0 0 12.7 12.7"
+   height="48"
+   width="48">
+  <defs
+     id="defs2" />
+  <metadata
+     id="metadata5">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <g
+     id="layer1">
+    <path
+       id="path869"
+       d="M 5.9999998,0 2,12 3.9058027,11 H 7.9098644 L 10,12 Z"
+       style="fill:none;stroke:#000000;stroke-width:0.264583px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" />
+  </g>
+</svg>

pool/asteroids/ship3.svg

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   id="svg8"
+   version="1.1"
+   viewBox="0 0 12.7 12.7"
+   height="48"
+   width="48">
+  <defs
+     id="defs2" />
+  <metadata
+     id="metadata5">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <g
+     id="layer1">
+    <path
+       id="path869"
+       d="M 5.9999998,0 2,12 3.9058027,9.4125 H 7.9098644 L 10,12 Z"
+       style="fill:none;stroke:#000000;stroke-width:0.264583px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" />
+  </g>
+</svg>

src/bin/asteroids.rs

@@ -0,0 +1,91 @@
+use geo::algorithm::intersects::Intersects;
+use geo::algorithm::rotate::Rotate;
+use geo::prelude::Translate;
+use geo::rotate::RotatePoint;
+use geo::{Coordinate, MultiPolygon, Point, Polygon};
+use geo::{LineString};
+use geo_clipper::Clipper;
+use polygon_art::MultiPolygonExt;
+use polygon_art::{load_multipolgon_from_svg, Context};
+use rand::prelude::StdRng;
+use rand::Rng;
+
+fn main() {
+    let mut context = Context::create();
+    let mut rng = context.gen_rng();
+
+    let ship_width = 100.;
+    let center_point = MultiPolygon(vec![create_asteroid(&mut rng, 20, 2)])
+        .scale_to_width(2.5 * ship_width)
+        .translate(context.width / 2., context.height / 2.);
+
+    // create asteroid
+    let mut asteroids: Vec<MultiPolygon<f64>> = Vec::new();
+    for _ in 0..40 {
+        let without_orbit = rng.gen_range(40..140) as f64;
+        let with_orbit = without_orbit * 1.32;
+        let x = rng.gen_range(0..(context.width as i32)) as f64;
+        let y = rng.gen_range(0..(context.height as i32)) as f64;
+        let asteroid = MultiPolygon(vec![create_asteroid(&mut rng, 20, 15)])
+            .scale_to_width(with_orbit)
+            .translate(x, y);
+
+        if !center_point.intersects(&asteroid) && asteroids
+            .iter()
+            .find(|&m| *&m.intersects(&asteroid))
+            .is_none()
+        {
+            asteroids.push(asteroid.scale_to_width(without_orbit));
+        }
+        if asteroids.len() > 23 {
+            break;
+        }
+    }
+
+    // load ships
+    let rotation = rng.gen_range(0..360);
+    let ship = load_multipolgon_from_svg("pool/asteroids/ship3.svg")
+        .unwrap()
+        .scale_to_width(ship_width)
+        .translate_center()
+        .rotate(rotation as f64);
+    context.translate_center();
+    context.draw_multipolygon(&ship);
+    context.restore();
+
+    // drawing and clipping
+    let frame_space = 10.;
+    let window = context.frame(frame_space, frame_space, frame_space, frame_space);
+    context.draw_polygon(&window);
+
+    for asteroid in asteroids.iter() {
+        context.draw_multipolygon(&asteroid.intersection(&window, 100.));
+    }
+
+    context.render();
+}
+
+fn create_asteroid(rng: &mut StdRng, subdivisions: i32, radius_randomization: i32) -> Polygon<f64> {
+    let mut asteroid_points: Vec<Point<f64>> = Vec::new();
+    for _ in 0..subdivisions {
+        let change = rng.gen_range(0..(radius_randomization * 2));
+        asteroid_points.push(Point(Coordinate {
+            x: 0.0,
+            y: 100.0 + (change - radius_randomization) as f64,
+        }));
+        for point in asteroid_points.iter_mut() {
+            let (x, y) = point
+                .rotate_around_point(
+                    360. / subdivisions as f64,
+                    Point(Coordinate { x: 0., y: 0. }),
+                )
+                .x_y();
+            point.set_x(x);
+            point.set_y(y);
+        }
+    }
+    Polygon::new(
+        LineString(asteroid_points.iter().map(|point| point.0).collect()),
+        Vec::new(),
+    )
+}

src/context.rs

@@ -1,6 +1,6 @@
 use cairo::Format;
 use cairo::{ImageSurface, SvgSurface};
-use geo_types::{LineString, MultiPolygon, Polygon};
+use geo::{polygon, LineString, MultiPolygon, Polygon};
 use rand::rngs::StdRng;
 use rand::{Rng, SeedableRng};
 
@@ -22,6 +22,16 @@ pub struct Context {
 }
 
 impl Context {
+    /// generate a frame for the image
+    pub fn frame(&mut self, left: f64, bottom: f64, right: f64, top: f64) -> Polygon<f64> {
+        polygon![
+        (x: left, y: top),
+        (x: self.width - right, y: top),
+        (x: self.width - right, y: self.height - bottom),
+        (x: left , y: self.height - bottom),
+        ]
+    }
+
     pub fn draw_multipolygon(&self, multi_polygon: &MultiPolygon<f64>) {
         for polygon in multi_polygon.iter() {
             self.draw_polygon(polygon);
@@ -48,10 +58,7 @@ impl Context {
         }
         context.stroke();
     }
-}
 
-// cairo facades
-impl Context {
     /// restore state which was saved before by the context
     pub fn restore(&self) {
         self.render_container.context().restore();
@@ -81,6 +88,9 @@ impl Context {
         self.render_container.render();
     }
 
+    pub fn gen_rng(&mut self) -> StdRng {
+        StdRng::seed_from_u64(self.pseudo_random_number_generator.gen())
+    }
     pub fn create() -> Context {
         let opt = Opt::get_command_line_arguments();
         let height = f64::from(opt.height.clone());