Ink Custom Brush Builder
Creates custom BrushFamily definitions for an Android app using Jetpack Ink...
Install
npx skills add android/skills --skill ink-custom-brush-builder -g -a claude-code -y- Repository
- android/skills10.2k
- Category
- Mobile
- Updated
- 6d ago
- License
- Complete terms in LICENSE.txt
- Context cost
- Mediumabout 1,531 tokens
- Runs scripts
- No, instructions only
What it does
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.
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)
Create a Brush by combining a custom BrushFamily with a Compose Color,
size, and epsilon:
val brush = Brush.createWithComposeColor(
family = myCustomFamily,
color = Color.Black,
size = 10f,
epsilon = 0.1f,
)
