refactor: move hand debug gizmos into bevy_mod_xr

Signed-off-by: Schmarni <marnistromer@gmail.com>

crates/bevy_xr/src/hand_debug_gizmos.rs

@@ -0,0 +1,49 @@
+use crate::hands::{HandBone, XrHandBoneRadius};
+use crate::spaces::XrSpaceLocationFlags;
+use bevy::color::palettes::css;
+use bevy::{prelude::*, transform::TransformSystem};
+pub struct HandGizmosPlugin;
+impl Plugin for HandGizmosPlugin {
+    fn build(&self, app: &mut App) {
+        app.add_systems(
+            PostUpdate,
+            draw_hand_gizmos.after(TransformSystem::TransformPropagate),
+        );
+    }
+}
+fn draw_hand_gizmos(
+    mut gizmos: Gizmos,
+    query: Query<(
+        &GlobalTransform,
+        &HandBone,
+        &XrHandBoneRadius,
+        &XrSpaceLocationFlags,
+    )>,
+) {
+    for (transform, bone, radius, flags) in &query {
+        if (!flags.position_tracked) || (!flags.rotation_tracked) {
+            continue;
+        }
+        let pose = transform.compute_transform();
+        let pose = Isometry3d {
+            translation: pose.translation.into(),
+            rotation: pose.rotation,
+        };
+        gizmos.sphere(pose, **radius, gizmo_color(bone));
+        gizmos.axes(pose, **radius);
+    }
+}
+
+fn gizmo_color(bone: &HandBone) -> Srgba {
+    match bone {
+        HandBone::Palm => css::WHITE,
+        HandBone::Wrist => css::GRAY,
+        b if b.is_thumb() => css::RED,
+        b if b.is_index() => css::ORANGE,
+        b if b.is_middle() => css::YELLOW,
+        b if b.is_ring() => Srgba::rgb(0.0, 1.0, 0.0),
+        b if b.is_little() => css::BLUE,
+        // should be impossible to hit
+        _ => Srgba::rgb(1.0, 0.0, 1.0),
+    }
+}

crates/bevy_xr/src/lib.rs

@@ -4,3 +4,4 @@ pub mod hands;
 pub mod session;
 pub mod types;
 pub mod spaces;
+pub mod hand_debug_gizmos;