additional track fields + simplified arc helper

src/states/linear/components_track.rs

@@ -27,7 +27,10 @@ pub enum PathSegment {
 
 #[derive(Resource)]
 pub struct PrecalculatedTrack{
-    pub segments: Vec<PTSegment>
+    pub segments: Vec<PTSegment>,
+    pub min_spawn_gap: f32, //нормализован
+    pub total_length: f32,
+    pub speed_norm: f32,
 }
 
 #[derive(Debug)]
@@ -41,6 +44,7 @@ pub struct PTSegment {
     pub radius: f32,
     pub start_angle: f32,
     pub sweep_sign: f32,
+    pub length: f32,
 }
 
 #[derive(Debug, Clone, Copy)]