Fuzzy Logic Compare

A Flutter desktop application for defining fuzzy logic parameters as a directed acyclic graph (DAG), creating fuzzy objects with specific values, and comparing multiple objects with visual result trees.

Features

• DAG Parameter Structure — Parameters can contribute to multiple other parameters (not just a tree). Cycle detection prevents circular dependencies.
• Fuzzy Objects — Create multiple objects and assign values to each leaf parameter
• Visual Comparison — Select 2+ objects and compare them; results displayed in a color-coded tree overlay
• JSON Persistence — Save and load projects as JSON files
• Close Warning — Warns before closing if there are unsaved changes
• Cross-Platform — Supports Linux desktop, Android, and web

Screenshots

Launcher Screen — Create a new project or open an existing JSON file

Main Editor — Split-screen layout with parameter list (left) and fuzzy object editor (right)

Comparison Result — Floating overlay showing computed scores per parameter

How to Use

1. Create a Project

   • Launch the app and click "New Project"
   • Enter a project name
   • A root parameter is automatically created with the project name

2. Define Parameters (Left Panel)

   • Click the + button to add new parameters
   • Each parameter shows its weight, aggregation method, and optional max value
   • Click "Add Contributor" to link an existing parameter as an input
   • Click the edit icon to adjust name, weight, aggregation, and max value
   • Click the delete icon to remove a parameter
   • Root parameters (those with no parents) don't have weight — they are final outputs

3. Add Fuzzy Objects (Right Panel)

   • Click the + button to add a new fuzzy object
   • Select an object from the list to edit its values
   • Use sliders to set values (0-1) for each leaf parameter
   • If a max value is set, the display shows normalized values

4. Compare Objects

   • Check the checkbox next to 2 or more objects
   • Click the Compare button
   • View the color-coded result tree showing computed scores

5. Save Your Work

   • Ctrl+S — Save (overwrite current file)
   • Save As... — Save to a new file
   • Open Another Project — Switch to a different JSON file without restarting

JSON File Format

{
  "name": "My Project",
  "parameters": [
    {
      "id": "...",
      "name": "Quality",
      "weight": 1.0,
      "aggregation": "avg",
      "contributorIds": ["durability-id", "comfort-id"]
    },
    {
      "id": "durability-id",
      "name": "Durability",
      "weight": 0.8,
      "aggregation": "avg",
      "contributorIds": [],
      "maxValue": 100
    }
  ],
  "fuzzyObjects": [
    {
      "id": "...",
      "name": "Product A",
      "values": {
        "durability-id": 0.85
      }
    }
  ]
}

Running the App

Linux Desktop

flutter run -d linux

Android

flutter run -d android

Web

flutter run -d chrome

Build Release

flutter build linux
flutter build apk
flutter build web

Architecture

lib/
├── main.dart                      # App entry point
├── models/
│   ├── project.dart               # Project data model
│   ├── parameter.dart             # Parameter node (DAG)
│   └── fuzzy_object.dart          # Fuzzy object with values
├── controllers/
│   └── project_controller.dart    # State management (ChangeNotifier)
├── services/
│   └── json_storage.dart          # File open/save logic
├── screens/
│   ├── launcher_screen.dart       # New / Open project
│   ├── main_editor_screen.dart    # Split-screen editor
│   ├── comparison_overlay.dart    # Comparison result dialog
│   └── settings_screen.dart       # App settings & help
└── widgets/
    ├── parameter_list.dart        # Editable parameter list (DAG)
    ├── fuzzy_object_editor.dart   # Value editor with sliders
    └── result_tree.dart           # Color-coded result tree

Dependencies

• provider — State management
• file_selector — Native file dialogs
• package_info_plus — App version display
• path_provider — Default directories
• window_manager — Desktop window management (close warning)
• uuid — Unique IDs for parameters and objects

License

This project is licensed under the BSD-3 License. See LICENSE for details.