Add galaxy parameter UI, star selection, and movement/physics scaffolding
Galaxy creation scene (Bevy 0.16):
- Split into module folder: params.rs, mod.rs (generation + spawn), ui.rs,
selection.rs
- GalaxyParams resource (seed, count, arms, vertical_arms, size, twist,
vertical_twist) with generation counter for change detection
- Control panel: 7 +/- slider rows + Regenerate button, no native Bevy slider
widget so uses label + icon buttons
- Info panel: live-refreshes on selection change via despawn_related::<Children>
- Click-to-select: screen-space picking (project each star to viewport, closest
within 18px threshold wins); selected star lerps scale to 2.2x
- Generation faithfully ports the docs TS reference including vertical arms
- Regeneration system: despawns GalaxyScene root only, preserves UI panels
Camera:
- Camera2d -> Camera3d + OrbitCamera (left-drag yaw/pitch, scroll zoom,
pitch/distance clamped to avoid gimbal)
- Orbit drag suppressed when cursor over UI
New plugins (scaffolding):
- movement/: Velocity, MaxSpeed, TurnRate, Drag, MoveTarget, Player components
+ click-to-move (no player spawned yet)
- physics/: pure-data geometry (ray_vs_sphere, overlaps, separate,
segment_vs_sphere) with 7 passing unit tests; no systems wired yet
- star_map/: plugin skeleton gated on AppState::InGame
Shared:
- ui/util.rs: cursor_over_ui helper for UI-hover detection
- docs: ARCH-9 decision record (custom movement & collision, no physics engine)
francy51
c14f684b09