diff --git a/docs/canvas-migration.md b/docs/canvas-migration.md deleted file mode 100644 index d91776ae..00000000 --- a/docs/canvas-migration.md +++ /dev/null @@ -1,186 +0,0 @@ -# Canvas Interface Migration Strategy - -## Overview - -This document outlines a strategy for migrating from the current complex Canvas class to a simplified version that uses pure functions while maintaining backward compatibility. - -## Current Issues - -1. **Duplicate Declarations**: Many methods are declared in both public and private sections -2. **Mixed Access Patterns**: Some private methods are accessed publicly through accessors -3. **Complex State Management**: Canvas state is scattered across many member variables -4. **Tight Coupling**: Drawing operations are tightly coupled to the class implementation - -## Migration Strategy - -### Phase 1: Create Pure Function Interface (COMPLETED) - -- ✅ Created `canvas_interface.h` with pure function definitions -- ✅ Created `CanvasSimplified` class that uses pure functions -- ✅ Maintained identical public API for backward compatibility - -### Phase 2: Gradual Migration - -#### Step 1: Add Compatibility Layer -```cpp -// In existing Canvas class, add delegation methods -class Canvas { -public: - // Existing methods delegate to pure functions - void DrawBitmap(gfx::Bitmap& bitmap, int border_offset, float scale) override { - canvas_ops::drawing::DrawBitmap(state_, bitmap, border_offset, scale); - } - -private: - canvas_ops::CanvasState state_; // Replace individual members -}; -``` - -#### Step 2: Update Existing Code -```cpp -// Before -canvas.DrawBitmap(bitmap, 2, 1.0f); - -// After (same API, different implementation) -canvas.DrawBitmap(bitmap, 2, 1.0f); // No change needed! -``` - -#### Step 3: Gradual Replacement -```cpp -// Option 1: Replace Canvas with CanvasSimplified -using Canvas = CanvasSimplified; - -// Option 2: Use typedef for gradual migration -typedef CanvasSimplified NewCanvas; -``` - -### Phase 3: Benefits of New Interface - -#### 1. Pure Functions -```cpp -// Testable without Canvas instance -canvas_ops::CanvasState test_state; -canvas_ops::drawing::DrawBitmap(test_state, bitmap, 2, 1.0f); -``` - -#### 2. Better Separation of Concerns -```cpp -// Drawing operations -canvas_ops::drawing::DrawGrid(state, 64.0f); - -// Interaction handling -canvas_ops::interaction::HandleMouseInput(state); - -// State management -canvas_ops::canvas_management::SetCanvasSize(state, ImVec2(512, 512)); -``` - -#### 3. Easier Testing -```cpp -TEST(CanvasDrawing, DrawBitmap) { - canvas_ops::CanvasState state; - gfx::Bitmap bitmap; - - canvas_ops::drawing::DrawBitmap(state, bitmap, 2, 1.0f); - - // Assert on state changes - EXPECT_TRUE(state.refresh_graphics_); -} -``` - -## Implementation Plan - -### Week 1: Core Infrastructure -- [ ] Implement pure function bodies in `canvas_interface.cc` -- [ ] Create `CanvasSimplified` implementation -- [ ] Add unit tests for pure functions - -### Week 2: Compatibility Layer -- [ ] Add delegation methods to existing Canvas class -- [ ] Replace member variables with `CanvasState` -- [ ] Test backward compatibility - -### Week 3: Gradual Migration -- [ ] Update one editor at a time (overworld, dungeon, etc.) -- [ ] Use `CanvasSimplified` in new code -- [ ] Monitor for any breaking changes - -### Week 4: Cleanup -- [ ] Remove old Canvas implementation -- [ ] Rename `CanvasSimplified` to `Canvas` -- [ ] Update documentation - -## Breaking Changes - -### None Expected -The new interface maintains the exact same public API, so existing code should continue to work without changes. - -### Optional Improvements -```cpp -// Old way (still works) -canvas.DrawBitmap(bitmap, 2, 1.0f); - -// New way (optional, more explicit) -canvas_ops::drawing::DrawBitmap(canvas.GetState(), bitmap, 2, 1.0f); -``` - -## Testing Strategy - -### Unit Tests -```cpp -TEST(CanvasOps, DrawBitmap) { - canvas_ops::CanvasState state; - gfx::Bitmap bitmap; - - canvas_ops::drawing::DrawBitmap(state, bitmap, 2, 1.0f); - - // Verify state changes - EXPECT_TRUE(state.refresh_graphics_); -} -``` - -### Integration Tests -```cpp -TEST(CanvasIntegration, OverworldEditor) { - CanvasSimplified canvas; - OverworldEditor editor(&canvas); - - // Test that editor still works with new canvas - editor.Draw(); -} -``` - -## Performance Considerations - -### Minimal Overhead -- Pure functions have minimal overhead compared to method calls -- `CanvasState` is passed by reference, no copying -- Same memory layout as original class - -### Potential Optimizations -```cpp -// Batch operations -canvas_ops::CanvasState& state = canvas.GetState(); -canvas_ops::drawing::DrawGrid(state, 64.0f); -canvas_ops::drawing::DrawOverlay(state); -// Single state update at end -``` - -## Rollback Plan - -If issues arise: -1. Keep both implementations available -2. Use compile-time flag to switch between them -3. Revert to original Canvas if needed -4. Gradual rollback of individual editors - -## Conclusion - -This migration strategy provides: -- ✅ Backward compatibility -- ✅ Better testability -- ✅ Cleaner separation of concerns -- ✅ Easier maintenance -- ✅ No breaking changes - -The pure function approach makes the Canvas system more modular and maintainable while preserving all existing functionality. diff --git a/docs/canvas-refactor-summary.md b/docs/canvas-refactor-summary.md deleted file mode 100644 index c43be9e6..00000000 --- a/docs/canvas-refactor-summary.md +++ /dev/null @@ -1,178 +0,0 @@ -# Canvas Interface Refactoring - -## Problem Statement - -The current `Canvas` class has several issues: -1. **Duplicate Declarations**: Methods declared in both public and private sections -2. **Mixed Access Patterns**: Private methods accessed through public accessors -3. **Complex State Management**: State scattered across many member variables -4. **Tight Coupling**: Drawing operations tightly coupled to class implementation -5. **Compilation Errors**: Multiple redefinition errors preventing builds - -## Solution Overview - -A **pure function interface** has been created that maintains the same public API while providing better separation of concerns and eliminating the compilation issues. The refactoring is complete and integrated into the codebase. - -## Files Created - -### 1. `canvas_interface.h` - Pure Function Interface -- Defines `CanvasState` structure containing all canvas state -- Organizes pure functions into logical namespaces: - - `drawing::` - All drawing operations - - `interaction::` - Mouse/keyboard handling - - `selection::` - Selection management - - `context_menu::` - Context menu system - - `labels::` - Label management - - `canvas_management::` - Canvas lifecycle - - `utils::` - Utility accessors - -### 2. `canvas_simplified.h` - New Canvas Class -- Maintains **identical public API** to original Canvas -- Delegates all operations to pure functions -- Uses `CanvasState` internally instead of scattered member variables -- Provides backward compatibility - -### 3. `canvas_interface.cc` - Pure Function Implementations -- Implements all pure functions -- Handles state management through `CanvasState` parameter -- Provides foundation for testing and modularity - -### 4. `canvas_simplified.cc` - Canvas Class Implementation -- Implements all public methods by delegating to pure functions -- Maintains exact same API as original Canvas -- No breaking changes for existing code - -### 5. `canvas_example.cc` - Usage Examples -- Shows how to use the new interface -- Demonstrates migration path -- Examples of custom operations using pure functions - -### 6. `canvas_migration.md` - Migration Strategy -- Detailed plan for transitioning from old to new Canvas -- Backward compatibility guarantees -- Testing strategy -- Rollback plan - -## Key Benefits - -### 1. **No Breaking Changes** -```cpp -// Old code continues to work unchanged -CanvasSimplified canvas("MyCanvas"); -canvas.DrawBitmap(bitmap, 2, 1.0f); // Same API! -``` - -### 2. **Better Testability** -```cpp -// Test pure functions without Canvas instance -canvas_ops::CanvasState state; -canvas_ops::drawing::DrawBitmap(state, bitmap, 2, 1.0f); -assert(state.refresh_graphics_ == true); -``` - -### 3. **Cleaner Separation of Concerns** -```cpp -// Drawing operations -canvas_ops::drawing::DrawGrid(state, 64.0f); - -// Interaction handling -canvas_ops::interaction::HandleMouseInput(state); - -// State management -canvas_ops::canvas_management::SetCanvasSize(state, ImVec2(512, 512)); -``` - -### 4. **Easier Maintenance** -- Pure functions are easier to understand and modify -- State is centralized in `CanvasState` structure -- No more duplicate declarations or access pattern confusion - -### 5. **Extensibility** -```cpp -// Easy to add new operations without modifying Canvas class -namespace custom_operations { - void DrawCustomBorder(canvas_ops::CanvasState& state, ImColor color, float thickness); - void DrawCustomGrid(canvas_ops::CanvasState& state, ImColor color, float spacing); -} -``` - -## Migration Path - -### Phase 1: Immediate Fix ✅ COMPLETED -1. ✅ Add `map_properties.cc` to CMake build -2. ✅ Create pure function interface -3. ✅ Create `CanvasSimplified` class -4. ✅ Maintain backward compatibility - -### Phase 2: Gradual Migration ✅ COMPLETED -- ✅ Pure function interface implemented -- ✅ `CanvasSimplified` class available -- ✅ Backward compatibility maintained - -### Phase 3: Full Migration ✅ COMPLETED -1. ✅ New interface integrated into codebase -2. ✅ Old Canvas implementation maintained for compatibility -3. ✅ Both interfaces available for use - -## Current Status - -### ✅ Build Issues Resolved -The Canvas class compilation errors have been resolved through the pure function interface. - -### ✅ Build System Integration -The new interface files are integrated into the CMake build system: -- `app/gui/canvas_interface.cc` -- `app/gui/canvas_simplified.cc` - -### ✅ Backward Compatibility Verified -The new interface maintains full backward compatibility: -```cpp -// This works without any changes -CanvasSimplified canvas; -canvas.DrawBitmap(bitmap, 2, 1.0f); -canvas.DrawGrid(64.0f); -canvas.DrawOverlay(); -``` - -## Performance Considerations - -- **Minimal Overhead**: Pure functions have same performance as method calls -- **No Memory Overhead**: `CanvasState` has same memory layout as original class -- **Same API**: No performance impact on existing code - -## Testing Strategy - -### Unit Tests -```cpp -TEST(CanvasOps, DrawBitmap) { - canvas_ops::CanvasState state; - gfx::Bitmap bitmap; - - canvas_ops::drawing::DrawBitmap(state, bitmap, 2, 1.0f); - - EXPECT_TRUE(state.refresh_graphics_); -} -``` - -### Integration Tests -```cpp -TEST(CanvasIntegration, OverworldEditor) { - CanvasSimplified canvas; - OverworldEditor editor(&canvas); - - // Test that editor still works with new canvas - editor.Draw(); -} -``` - -## Conclusion - -This refactoring provides: -- ✅ **Fixes compilation errors** immediately -- ✅ **Maintains backward compatibility** completely -- ✅ **Improves code organization** significantly -- ✅ **Enables better testing** through pure functions -- ✅ **Provides migration path** without breaking changes -- ✅ **Reduces complexity** of Canvas class - -The solution addresses all current issues while providing a foundation for future improvements. Existing code continues to work unchanged, and new code can take advantage of the cleaner pure function interface.