Twenty Five Slicer

Twenty Five Slicer is a Unity package designed for more advanced sprite slicing, enabling a "25-slice" approach. It divides a sprite into a 5x5 grid, allowing precise scaling and manipulation of individual regions while preserving key areas.

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9-slice vs 25-slice

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Key Concept

• 9 slices: Non-stretchable areas.
• 6 slices: Stretch horizontally only.
• 6 slices: Stretch vertically only.
• 4 slices: Stretch in both directions.

This allows for far more detailed slicing. Where traditional 9-slice images often require stacking multiple image layers to achieve complex UI shapes (e.g., speech bubbles, boxes with icons or separators at the center), a 25-slice configuration can often handle these scenarios with just a single image.

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Installing the Package

1. Install via OpenUPM

1.1. Install via Package Manager

Please follow the instructions:

1. Open Edit → Project Settings → Package Manager
2. Add a new Scoped Registry (or edit the existing OpenUPM entry)

• Name: package.openupm.com
• URL: https://package.openupm.com

3. Click Save or Apply
4. Open Window → Package Manager
5. Click the + button
6. Select Add package by name... (or Add package from git URL...)
7. Paste com.kwanjoong.twentyfiveslicer into Name
8. Paste a version (e.g., 1.1.2) into Version
9. Click Add

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1.2. Alternatively, merge the snippet into Packages/manifest.json

{
  "scopedRegistries": [
    {
      "name": "package.openupm.com",
      "url": "https://package.openupm.com",
      "scopes": []
    }
  ],
  "dependencies": {
    "com.kwanjoong.twentyfiveslicer": "1.1.2"
  }
}

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1.3. Install via command-line interface

openupm add com.kwanjoong.twentyfiveslicer

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2. Install via Git URL

1. Open the Unity Package Manager.
2. Select Add package from Git URL.
3. Enter: https://github.com/kwan3854/twentyfiveslicer.git
4. To install a specific version, append a version tag, for example:
   https://github.com/kwan3854/twentyfiveslicer.git#v1.0.0

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How to Use

Create Slice Data Map (First-time Setup)

1. Navigate to the Assets/Resources folder. (Create it if it doesn’t exist.)
2. Right-click → Create → TwentyFiveSlicer → SliceDataMap

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Editing a Sprite

1. Open the 25-Slice Editor

• Window → 2D → 25-Slice Editor

2. Load Your Sprite

• Drag and drop your sprite into the editor or select it via the provided field.

3. Adjust the Slices

• Use the sliders to define horizontal and vertical cut lines, dividing the sprite into 25 sections.
• Borders are displayed visually for accurate adjustments.

4. Save the Configuration

• Click Save Borders to store the 25-slice settings.

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Using the 25-Sliced Sprite

1. Using with UI (TwentyFiveSliceImage)

This is the UI approach, similar to UnityEngine.UI.Image:

1. Create a TwentyFiveSliceImage GameObject or add TwentyFiveSliceImage to an existing UI element in a Canvas.
2. Assign your 25-sliced sprite to the TwentyFiveSliceImage.
3. Adjust the RectTransform size to see how each slice region scales or remains fixed.

2. Using with 2D Scenes (TwentyFiveSliceSpriteRenderer)

This is the MeshRenderer-based approach, similar to SpriteRenderer:

1. You can create a 25-Sliced Sprite in the Hierarchy:

• Right-click → 2D Object → Sprites → 25-Sliced
  This will instantiate a GameObject named 25-Sliced Sprite with TwentyFiveSliceSpriteRenderer attached.

2. In the Inspector, assign your 25-sliced sprite to its Sprite field.
3. Adjust the Size property in the Inspector (instead of using transform.localScale) to properly stretch or preserve corners/edges as needed.
4. Sorting Layer and Order in Layer are also available, just like a normal SpriteRenderer.

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Key Features

• Divide sprites into a 5x5 grid for highly detailed control.
• Seamlessly scale and stretch specific sprite regions.
• UI approach (TwentyFiveSliceImage) for usage in UGUI-based canvases.
• 2D Mesh approach (TwentyFiveSliceSpriteRenderer) for usage in 2D scenes without UI.
• Compatible with Unity’s 2D workflow, supports Sorting Layers.
• Intuitive editor window with clear visual guidance for precise adjustments.

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Delete Unused Data

You can remove slice data that is no longer needed: Tools → Twenty Five Slicer Tools → Slice Data Cleaner

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For more information or contributions, visit the repository.