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docs/ui_implementation_plan.md

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-# UI Implementation Plan - Body Selection and Information Display
-
-## Overview
-Add UI elements using raygui to list celestial bodies and display detailed information about selected bodies.
-
-## UI Library Choice
-**raygui** - raylib's official immediate-mode GUI library
-- Seamless integration with existing raylib code
-- Lightweight and follows raylib's C-style conventions
-- Provides `GuiListView()` for body lists and `GuiWindowBox()` for information panels
-- No additional dependencies beyond raylib
-
-## Implementation Status: ✅ COMPLETED
-
-All phases have been successfully implemented. See `docs/ui_implementation_summary.md` for detailed implementation summary.
-
-## Implementation Phases
-
-### ✅ Phase 1: Add raygui Submodule (COMPLETED)
-1. **Added raygui as git submodule** in `ext/raygui/`
-    - Follows existing pattern with `ext/` directory
-    - Keeps raygui version-controlled and easily updatable
-    - Matches current dependency management approach
-
-2. **Updated .gitmodules**
-    - Added new entry for raygui submodule
-
-### ✅ Phase 2: Update Build System (COMPLETED)
-1. **Modified Makefile**
-    - Added raygui include path: `-I./ext/raygui/src`
-    - Added raygui.c compilation integration
-    - Updated linking to include raygui objects
-
-2. **Integration approach**
-    - Followed existing pattern from tomlc17 integration
-    - Added raygui implementation with `#define RAYGUI_IMPLEMENTATION` in renderer.cpp
-
-### ✅ Phase 3: Code Integration (COMPLETED)
-1. **Updated renderer.h**
-    - Added raygui include with `#define RAYGUI_IMPLEMENTATION`
-    - Extended RenderState with UI fields:
-      - `int selected_body_index`    // -1 = no selection
-      - `bool show_body_list`        // Toggle for list panel
-      - `bool show_body_info`        // Toggle for info panel
-
-2. **Added UI functions to renderer.h**
-    - `void render_body_list_ui(SimulationState* sim, RenderState* render_state);`
-    - `void render_body_info_ui(SimulationState* sim, RenderState* render_state);`
-
-### ✅ Phase 4: Implementation Details (COMPLETED)
-1. **UI Layout Strategy** - IMPLEMENTED
-    - Left panel (200px x 400px): Body list using `GuiListView()`
-    - Right panel (250px x 300px): Detailed info using `GuiLabel()`
-    - Both panels toggleable with keyboard shortcuts
-
-2. **raygui-specific considerations** - IMPLEMENTED
-    - raygui immediate-mode integration in renderer.cpp
-    - Used `#define RAYGUI_IMPLEMENTATION` in renderer.cpp
-    - Compiled alongside raylib without conflicts
-
-3. **Controls Integration** - IMPLEMENTED
-    - 'B' key: Toggle body list panel
-    - 'I' key: Existing info toggle (simulation info)
-    - Mouse: Select from list, close panels with X button
-    - ESC: Quit (unchanged)
-
-4. **Body Information Display** - IMPLEMENTED
-    When a body is selected, displays:
-    - Name, mass, radius
-    - Current position (x, y, z) and velocity magnitude
-    - Orbital parameters (eccentricity, semi-major axis)
-    - Parent body and SOI radius
-
-### ✅ Phase 5: Integration and Polish (COMPLETED)
-1. **Updated main render loop**
-    - UI rendering functions called after 3D rendering before `EndDrawing()`
-    - Proper depth ordering maintained (3D scene → UI panels → end frame)
-    - UI state initialized in main.cpp
-
-2. **User experience enhancements** - PARTIALLY IMPLEMENTED
-    - Body list and info panels functional
-    - Selection persists across frames
-    - Info panel auto-opens when body selected
-    - Window close (X) buttons functional
-
-## Key Technical Details (IMPLEMENTED)
-
-### raygui Functions Used:
-- `GuiWindowBox(bounds, title)` - Draggable window containers
-- `GuiListView(bounds, text, scrollIndex, active)` - Scrollable body list
-- `GuiLabel(bounds, text)` - Multi-line information display
-
-### Data Flow:
-1. Simulation populates `SimulationState` with bodies
-2. UI reads body names from `sim->bodies[i].name` and converts to semicolon-separated string
-3. Selection updates `render_state->selected_body_index`
-4. Info panel displays detailed data from selected body
-
-### Layout Strategy (IMPLEMENTED):
-- Body list: Left side of screen (200px wide, 400px tall)
-- Info panel: Right side of screen (250px wide, 300px tall)
-- Both panels can be toggled independently
-- Maintain existing 3D viewport in center
-
-## Files Modified:
-1. ✅ **Makefile** - Added raygui compilation
-2. ✅ **src/renderer.h** - Added UI declarations and RenderState extensions
-3. ✅ **src/renderer.cpp** - Implemented UI rendering functions and raygui integration
-4. ✅ **src/main.cpp** - Initialize UI state and add keyboard controls
-5. ✅ **.gitmodules** - Added raygui submodule entry
-
-## Integration Notes (VERIFIED):
-- ✅ Maintains C-style architecture
-- ✅ Immediate-mode UI fits existing rendering loop
-- ✅ Minimal state management required
-- ✅ Follows existing dependency patterns (git submodules)
-
-## Bug Fixes
-
-### GuiListView Return Value Bug (FIXED)
-**Issue**: GuiListView() always returns 0 (known raygui bug), preventing body selection from working.
-
-**Solution**:
-- Added `body_list_scroll` and `body_list_active` to RenderState for state persistence
-- Check `body_list_active` parameter changes instead of return value
-- Initialize `body_list_active` to -1 in main.cpp
-
-**Reference**: https://github.com/raysan5/raygui/issues/448
-
-**Commits**:
-- `85bd9ee`: Fix raygui body selection - GuiListView return value bug
-- `1b8e092`: Improve buffer safety in body list string construction
-
-## Future Enhancements (Optional)
-
-### Potential Improvements:
-- **Camera focus**: Option to focus camera on selected body
-- **Visual highlighting**: Highlight selected body in 3D view
-- **Enhanced info**: Add real-time orbital metrics
-- **Search functionality**: Filter body list by name
-- **Multiple selection**: Select multiple bodies for comparison
-
-### Advanced Features:
-- **Reference frame switching**: View from selected body's perspective
-- **Orbit manipulation**: Edit orbital parameters via UI
-- **Time controls**: Jump to specific orbital positions
-- **Export functionality**: Save body data to file