Módulos

La API de Ink está modularizada, por lo que puedes usar solo lo que necesitas.

Brazadas

The strokes module serves as the foundation of the Ink API. Key data types within this module are:

• StrokeInputBatch: Represents a series of pointer inputs, including their position, timestamp, and optionally pressure, tilt, and orientation.
• InProgressStroke: Represents a stroke that is actively being drawn. InProgressStroke is used to render partial strokes with low latency and to build the final Stroke once input is complete, after which the object can be reused. InProgressStroke is used by the InProgressStrokes composable.
• Stroke: An immutable representation of a finalized stroke with fixed geometry. Each Stroke has an ImmutableStrokeInputBatch (input points), a Brush (style), and a PartitionedMesh (geometric shape). You can store, manipulate, and render strokes within your application.

Geometría

El módulo Geometry admite operaciones geométricas en formas primitivas (con clases específicas como Box y Vec), así como formas arbitrarias (con PartitionedMesh), incluida la detección y transformación de intersecciones. PartitionedMesh también puede contener datos adicionales para admitir la renderización.

Pincel

The brush module defines the style of strokes. It consists of two main parts:

• Brush: Specifies the style of a stroke including base color, base size, and BrushFamily. BrushFamily is analogous to a font family, it defines a stroke's style. For example, a BrushFamily can represent a specific style of marker or highlighter, allowing strokes with different sizes and colors to share that style.
• StockBrushes: Provides factory functions for creating ready-to-use BrushFamily instances.

Autoría

The Compose Authoring module lets you capture user touch input and render it as low-latency strokes on the screen in real time. This is achieved through the InProgressStrokes composable, which processes motion events and displays the strokes as they are drawn.

Once a stroke is completed, the composable notifies the client application using an InProgressStrokesFinishedListener callback. This allows the application to retrieve the finished strokes for rendering or storage.

In Compose, InProgressStrokes takes this callback in the onStrokesFinished parameter. Pass the finished strokes to another composable to commit them to the screen using the rendering module.

Renderización

El módulo Rendering simplifica el dibujo de trazos de tinta en un Canvas de Android. Proporciona CanvasStrokeRenderer para Compose y ViewStrokeRenderer para diseños basados en vistas. Estos renderizadores optimizan el rendimiento de la renderización y ayudan a ofrecer elementos visuales de alta calidad, incluido el suavizado.

Para renderizar trazos, llama al método create() para obtener una instancia de CanvasStrokeRenderer y, luego, llama al método draw() para renderizar trazos terminados (Stroke) o en curso (InProgressStroke) en un Canvas.

Puedes transformar el lienzo cuando dibujas un trazo. Algunos ejemplos incluyen el desplazamiento horizontal, el zoom y la rotación. Para renderizar el trazo correctamente, también debes pasar la transformación canvas a CanvasStrokeRenderer.draw.

Para evitar hacer un seguimiento de la transformación canvas por separado, usa ViewStrokeRenderer.

Almacenamiento

The storage module provides utilities for efficiently serializing and deserializing stroke data, primarily focusing on StrokeInputBatch.

The module uses protocol buffers and optimized delta compression techniques, resulting in significant storage savings compared to naive methods.

The storage module simplifies saving, loading, and sharing strokes.