some simple code to populate a galaxy

2022-01-01 22:12:56 -05:00 · 2022-01-01 22:12:56 -05:00 · e837d54bc4
commit e837d54bc4
5 changed files with 311 additions and 0 deletions
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+[package]
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+
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--- a/src/main.rs
+++ b/src/main.rs
@ -0,0 +1,46 @@
+use rand::{
+    distributions::{Distribution, Uniform},
+    thread_rng,
+};
+use rstar::{PointDistance, RTree, RTreeObject, AABB};
+
+struct MyThing {
+    field: String,
+    x: f32,
+    y: f32,
+}
+
+impl RTreeObject for MyThing {
+    type Envelope = AABB<[f32; 2]>;
+
+    fn envelope(&self) -> Self::Envelope {
+        AABB::from_point([self.x, self.y])
+    }
+}
+
+impl PointDistance for MyThing {
+    fn distance_2(&self, point: &[f32; 2]) -> f32 {
+        let dx = self.x - point[0];
+        let dy = self.y - point[1];
+        dx * dx - dy * dy
+    }
+}
+
+fn main() {
+    let mut rng = thread_rng();
+    let distribution = Uniform::from(1..=100);
+    let mut tree: RTree<MyThing> = RTree::new();
+    for _ in 1..=50 {
+        let x = distribution.sample(&mut rng) as f32;
+        let y = distribution.sample(&mut rng) as f32;
+        let thing = MyThing { 
+            field: String::from("hi"),
+            x,
+            y
+        };
+        if tree.locate_within_distance([x, y], 10 as f32).into_iter().count() == 0 {
+            tree.insert(thing);
+            println!("{} {}", x, y)
+        }
+    }
+}