Add better star factor

Cargo.lock

@@ -311,7 +311,7 @@ checksum = "f1bddf1187be692e79c5ffeab891132dfb0f236ed36a43c7ed39f1165ee20191"
 
 [[package]]
 name = "voxelmap"
-version = "0.6.0"
+version = "0.6.1"
 dependencies = [
  "clap",
  "lodepng",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "voxelmap"
-version = "0.6.0"
+version = "0.6.1"
 authors = ["raffitz <raf.a.m.c.gon@gmail.com>"]
 edition = "2018"
 description = "Creates voxel maps to build voxelised objects"

src/star.rs

@@ -58,7 +58,13 @@ pub fn generate<T: Into<String> + Clone, S: Into<f64> + Copy>(
     let angle_offset_label = format!("@{}innernangle0", prefix);
     let outer_prefix = format!("{}outer", prefix);
 
-    let outer_scale = star_scale.map(|s| s.into()).unwrap_or(2_f64) * new_scale.unwrap_or(1_f64);
+    let recip_n: f64 = (n as f64).recip();
+    let scale_angle = recip_n * std::f64::consts::PI;
+    let double_scale_angle = scale_angle + scale_angle;
+    let default_scale = scale_angle.sin() * double_scale_angle.tan() + scale_angle.cos();
+
+    let outer_scale =
+        star_scale.map(|s| s.into()).unwrap_or(default_scale) * new_scale.unwrap_or(1_f64);
 
     let (definitive_labels, boundaries, _) = ngon::generate(
         n,