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ink-custom-brush-builder

Creates custom BrushFamily definitions for an Android app using Jetpack Ink (androidx.ink 1.1.0-alpha03 and higher). Use this skill when configuring custom BrushTip shapes, adding pressure, tilt, speed, or noise sensitivity using BrushBehavior node graphs, creating multi-coat layered brushes, applying tiling or particle stamping textures, configuring SlidingWindowModel input smoothing, or serializing brushes. Delivers complete Kotlin BrushFamily, BrushCoat, BrushTip, BrushPaint, and BrushBehavior implementations. Don't use for View-based (XML) inking, Compose drawing surface setup, or stock brush selection. For Compose drawing surface setup, InProgressStrokes wet and dry rendering, eraser, or persistence, suggest the ink-app-builder skill.

jetpack-compose/ink/ink-custom-brush-builder/SKILL.md

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Last checked
Nov 3, 2026

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Repository last updated
Nov 5, 2026
License
Apache-2.0

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Custom brushes in the Android Ink API are built around the **`BrushFamily`**
hierarchy:

    BrushFamily
    ├── InputModel (BrushFamily.InputModel.SlidingWindowModel or PASSTHROUGH_MODEL)
    └── BrushCoat[] (one or more rendering layers)
        ├── BrushTip (shape: scaleX, scaleY, cornerRounding, rotationDegrees, slantDegrees, pinch)
        │   └── BrushBehavior[] (dynamic response to stylus or touch input)
        │       └── Tree: TargetNode(input = [Operators](input = SourceNode))
        └── BrushPaint (visual appearance)
            ├── SelfOverlap (ANY, ACCUMULATE, or DISCARD)
            ├── TextureLayer[] (BrushPaint.TilingTexture or BrushPaint.StampingTexture)
            └── BrushPaint.ColorFunction[] (OpacityMultiplier or ReplaceColor)