From 184d74a5aaa1c0c8ca925a19b432ced53d6de856 Mon Sep 17 00:00:00 2001
From: Emi Simpson <emi@alchemi.dev>
Date: Wed, 17 Nov 2021 13:10:50 -0500
Subject: [PATCH] Add "randomly" generated initial nodes

---
 src/main.rs | 28 +++++++++++++++++++++++-----
 src/util.rs |  2 +-
 2 files changed, 24 insertions(+), 6 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index f3c9b4f..6a3ae49 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -45,6 +45,11 @@ async fn main() {
 	let mut camera = dd.get_camera();
 	set_camera(&camera);
 	let mut iter = 0;
+
+	for _ in 0..160 {
+		dd.add_random_point().unwrap();
+	}
+
 	loop {
 		if iter == 100 {
 			iter = 0;
@@ -174,13 +179,15 @@ impl Default for DelaunayDemo {
 			(edges.3, (Border, (&triangles[1]).into())),
 			(edges.4, (Border, (&triangles[1]).into())),
 		].into();
+		let mut random = 0xACAB_1312;
+		util::pcg64_iterstate(&mut random);
 		let dd = DelaunayDemo {
 			nodes,
 			adjacency,
 			triangles,
 			height: HEIGHT,
 			width: WIDTH,
-			random_state: 1312_1312_1312,
+			random_state: random,
 			poisoned: false,
 			spanning_tree: HashSet::with_capacity(100),
 			spanning_tree_conn: HashMap::with_capacity(100),
@@ -602,16 +609,27 @@ impl DelaunayDemo {
 	}
 
 	fn click(&mut self, pos: Vec2) {
+		if let Err(msg) = self.add_point_random_dir(pos.as_f64()) {
+			self.poisoned = true;
+			eprintln!("POISONED: {}", msg);
+		}
+	}
+
+	fn add_random_point(&mut self) -> Result<(), String> {
+		let random = util::pcg64(&mut self.random_state);
+		let x = (random & 0xffffffff) as f64 / (0xffffffffu32 as f64) * self.width;
+		let y = (random >> 32) as f64 / (0xffffffffu32 as f64) * self.height;
+		self.add_point_random_dir((x, y).into())
+	}
+
+	fn add_point_random_dir(&mut self, pos: DVec2) -> Result<(), String> {
 		let random = util::pcg64(&mut self.random_state);
 		let angle = (random as f64) / (u64::MAX as f64) * (2.0 * std::f64::consts::PI);
 		let direction = DVec2::new(
 			f64::cos(angle),
 			f64::sin(angle),
 		);
-		if let Err(msg) = self.add_point(Node(pos.as_f64(), direction * SPEED)) {
-			self.poisoned = true;
-			eprintln!("POISONED: {}", msg);
-		}
+		self.add_point(Node(pos, direction * SPEED))
 	}
 
 	fn add_point(&mut self, node: Node) -> Result<(), String> {
diff --git a/src/util.rs b/src/util.rs
index 2330bec..22eef59 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -6,7 +6,7 @@ pub fn pcg64(state: &mut u128) -> u64 {
     ((x >> 58) as u64).rotate_right(count)
 }
 
-fn pcg64_iterstate(state: &mut u128) {
+pub fn pcg64_iterstate(state: &mut u128) {
 	const MULTIPLIER: u128 = 0xde92a69f6e2f9f25fd0d90f576075fbd;
 	const INCREMENT: u128 = 621;
 	*state = state.wrapping_mul(MULTIPLIER).wrapping_add(INCREMENT);