UnityGridLevelEditor

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UnityGridLevelEditor

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Unity Grid Level Editor - A powerful, fully customized level editor made in Unity using Odin Inspector. Built to quickly prototype and manage grid-based levels both in the editor and at runtime.

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# Grid Level Editor

A grid-based level editor for Unity, built with UI Toolkit. It lets you author, manage and preview tile-and-block levels stored as ScriptableObjects — directly in the editor and at runtime.

**Current version: 2.1.0** · Unity 2023.2+ · UI Toolkit

## Overview

The tool is split into two editor windows and a runtime generator:

- **Block Library** — define reusable block types (id, icon, prefab, footprint).
- **Level Editor** — paint levels on a grid using drag-and-drop, with selection, rotation, copy/paste and undo/redo.
- **Runtime Generator** — spawns the authored level in the scene with staggered DOTween animations and optional auto-switching between levels.

Levels and blocks are plain ScriptableObjects under `Assets/Resources/StaticData`, so they are versionable and load through the standard static-data pipeline.

## Features

### Block Library
- Dedicated window (`Tools → Grid Level Editor → Block Window`).
- Create, rename and delete block types; assign id, prefab and an optional icon.
- Auto icons: when a block has no icon sprite, the editor shows the prefab's auto-generated preview (Unity `AssetPreview`) everywhere — palette, grid, plates and drag ghosts. The icon sprite is just a manual override.
- Define multi-cell footprints (rectangle, L, T, cross, …) on a paint grid.
- Search and sort by id, prefab or icon name.

### Level Editor
- Visual grid editor (`Tools → Grid Level Editor → Level Window`).
- Create, rename, resize and delete levels.
- Drag blocks from the palette onto the grid; multi-cell objects render as a single merged plate that follows their exact footprint.
- Range selection, rotation, copy/paste and a per-level undo/redo history.
- Context menu (right click) for block selection, rotation, copy/paste and clearing.
- Zoom for large grids (− / ＋ / 1:1 buttons or Ctrl + mouse wheel).
- Free pan: hold the middle mouse button to drag the map anywhere inside a clipped viewport; a ⊕ button recenters it.
- "No space here" flash when a block or paste can't fit — including the blocking multi-cell object's plate.
- Built-in log panel and a controls overlay.

### Runtime Generator
- Spawns floor tiles and blocks from the authored level data through injected factories.
- Staggered show/hide animations via DOTween.
- One block per object is spawned at the object's geometric center.
- Optional auto-switching to the next level on a configurable interval.

## Controls & Shortcuts

| Action | Input |
| --- | --- |
| Place a block | Drag a tile from the palette onto the grid |
| Move a block / object | Left-click drag |
| Select cells (range) | Ctrl + Left-click |
| Block context menu | Right-click |
| Copy / paste selection | Ctrl + C / Ctrl + V |
| Undo / redo | Ctrl + Z / Ctrl + Y (or Ctrl + Shift + Z) |
| Clear selection | Backspace / Delete |
| Zoom in / out | Ctrl + Mouse Wheel (or − / ＋ buttons) |
| Reset zoom | 1:1 button |
| Pan the map | Middle-mouse drag |
| Recenter the map | ⊕ button |

Undo/redo is window-local and scoped to the current level: the history resets when you switch levels and when the window is closed.

## Getting Started

1. Open the project in Unity 2023.2 or newer.
2. Open `Tools → Grid Level Editor → Block Window` and create a few blocks (only the id is required; without an icon sprite the prefab's preview is used).
3. Open `Tools → Grid Level Editor → Level Window`, create a level, then drag blocks onto the grid.
4. Enter Play mode to see the level spawned by the runtime generator.

Data locations:
- Levels — `Assets/Resources/StaticData/LevelsData`
- Blocks & library — `Assets/Resources/StaticData/BlocksData`

## Project Structure

| Path | Responsibility |
| --- | --- |
| `Assets/Code/LevelEditor` | Runtime data model (`LevelMatrixEditor`, `LevelCell`, `BlockDataEditor`, `BlockLibrary`, `LevelDataDTO`) |
| `Assets/Code/LevelEditor/Editor` | UI Toolkit editor windows, grid view, palette, popups and undo history |
| `Assets/Code/LevelEditor/Editor/Grid` | Focused grid components (zoom, selection, hit-testing, highlight, plates, cell render, drag/move, pan, palette placement, shortcuts) split out of the grid view |
| `Assets/Code/Infrastructure` | Runtime generator, factories, static-data and save/load services |

The grid is stored as a flat, row-major `LevelCell[]` (Unity cannot serialize 2D arrays) and addressed through `Index(x, y)`. Multi-cell blocks share a positive `InstanceId`; standalone cells use `0`.

## Tech Stack

- Unity 2023.2
- UI Toolkit (editor UI)
- Zenject (dependency injection)
- DOTween (runtime animation)
- Odin Inspector (serialization in `SaveLoadService`)

## Changelog

### 2.1.0
- Auto block icons: a block's prefab preview is used when no icon sprite is set (icon is now optional).
- Free middle-mouse panning of the grid inside a clipped viewport, with a ⊕ recenter button.
- Grid zoom controls (− / ＋ / 1:1, Ctrl + mouse wheel) documented.
- "No space" flash now also blinks the blocking multi-cell object's plate.
- Internal: the monolithic grid view was refactored into focused single-responsibility components under `Editor/Grid`.

### 2.0.0
- UI Toolkit rewrite (migrated off Odin): drag-and-drop grid editor, multi-cell footprints, range selection, rotation, copy/paste, per-level undo/redo and the runtime generator.

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