refactor: updated project structure, set up PLAN

1 files changed, 46 insertions, 0 deletions

diff --git a/src/lunar/systems.rs b/src/lunar/systems.rs
new file mode 100644
index 0000000..4cdebdc
--- /dev/null
+++ b/src/lunar/systems.rs
@@ -0,0 +1,46 @@
+use bevy::prelude::*;
+use avian2d::prelude::*;
+use super::DestPlanet;
+use super::LunarOrbitalData;
+pub fn lunar_period_to_vec(angular_pos: f32, radius: f32) -> Vec2 {
+    let x = radius * f32::cos(angular_pos);
+    let y = radius * f32::sin(angular_pos);
+    Vec2 { x, y }
+}
+pub fn update_lunar_transform(
+    time: Res<Time>,
+    mut lunar_query: Query<(
+        &DestPlanet, 
+        &mut LunarOrbitalData, 
+        &mut Transform, 
+        &RigidBody
+    ), With<DestPlanet>>,
+) {
+    let (_moon_planet, mut lod, mut moon_transform, _moon_body) = lunar_query.single_mut();
+    let dt = time.delta_secs();
+    let new_transform = lunar_period_to_vec(
+        lod.period, 
+        lod.orbital_radius).normalize_or_zero() * lod.orbital_radius;
+    moon_transform.translation = Vec3 {x: new_transform.x, y: new_transform.y, z: 0.0};
+    lod.period = dt * lod.orbital_velocity;
+}
+pub fn setup_moon(mut cmd: Commands) {
+    let objective_planet = DestPlanet {
+        // display_name: String::from("Objective Planet"),
+        planet_mass_kg: 50.0,
+        radius: 5.0,
+    };
+    let lunar_radius = 900.0;
+    let r = (&objective_planet).radius;
+    let m = (&objective_planet).planet_mass_kg;
+    let initial_transform = lunar_period_to_vec(0., 100.);
+    cmd.spawn((
+        objective_planet,
+        LunarOrbitalData { period: 0., orbital_velocity: 1., orbital_radius: lunar_radius},
+        RigidBody::Dynamic,
+        Transform::from_xyz(initial_transform.x, initial_transform.y, 0.0),
+        Sprite::from_color(Color::BLACK, Vec2 { x: 30., y: 30. }),
+        Collider::circle(r),
+        Mass(m),
+    ));
+}
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