Reorganized the code structure, fix a lot of issues.

README.md

@@ -1,18 +1,14 @@
 # Cartograph
 
-A browser-based world map creation tool inspired by Wonderdraft and Inkarnate. Uses shape-based terrain generation with procedural detail.
+A browser-based world map creation tool inspired by Wonderdraft and Inkarnate. Uses line-strip vector shapes with procedural geometry.
 
-## Features (planned)
+## Features
 
-- **Shapes** — the fundamental building block. Each shape has:
-  - **Height** — additive (raise terrain) or subtractive (lower terrain)
-  - **Biome** — determines the sampled texture applied to the shape
-  - **Intensity** — blending weight of the biome texture
-  - **Roughness** — edge noise amount (voronoi-like jagged edges at maximum)
-- **Shape editing** — select, move, rotate, scale individual shapes
-- **Groups** — combine shapes into groups for batch operations
-- **Shake landmass** — procedurally decompose a shape into a more complex set of shapes
-- **Viewport** — zoom and pan across the map canvas
+- **Shapes** — procedural circles and stars with per-instance transforms (position, scale, rotation)
+- **Shape editing** — select, move, rotate, scale individual shapes; rect-select multiple shapes
+- **Undo/redo** — property-level history stack (position, scale, rotation, color) with edit session capture and batch operations
+- **Spatial index** — hash grid for fast hit testing and rect-selection queries on large shape counts
+- **Viewport** — zoom and pan with screen↔world coordinate transforms
 
 ## Tech stack
 
@@ -44,12 +40,16 @@ Output is `app.html`, served by Emscripten's built-in web server or any static s
 
 ```
 src/
-  main.c          Entry point, sokol init, render loop, input handling
-  api.h           Central include — all library headers and project-wide defines
-  sprite.h        Sprite batching, texture management, file import
+  main.c          Entry point, sokol init, render loop, input handling, UI panels, debug stats
+  api.h           Central include — all library headers, ALLOC/FREE macros
+  camera.h        Viewport state, zoom/pan, MVP matrix, screen↔world transforms
+  render.h        Shape pipeline init/shutdown, per-shape draw calls
+  shape.h         Shape geometry types, procedural generation, hit testing, buffer management
+  spatial.h       Spatial hash grid for accelerated hit tests and rect-select queries
+  history.h       Undo/redo stack with property-level tracking and batch operations
   util.h          Vector (dynamic array) and memory pool data structures
   rand.h          Xorshift32 PRNG utilities
-  shaders/        WGSL shader sources
+  shaders/        WGSL shader sources (shape, sprite)
   generated/      xxd-generated C headers from shaders
 lib/
   sokol/          Sokol single-file headers (gfx, app, glue, log)