模块

Ink API 已模块化，因此您可以仅使用所需的功能。

笔画

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.

几何体

几何图形模块支持对基本形状（使用 Box 和 Vec 等专用类）以及任意形状（使用 PartitionedMesh）进行几何运算，包括相交检测和转换。 PartitionedMesh 还可以保存其他数据以支持渲染。

笔刷

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.

编写

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.

渲染

渲染模块可简化在 Android Canvas 上绘制墨水笔画的过程。 它为 Compose 提供 CanvasStrokeRenderer，为基于视图的布局提供 ViewStrokeRenderer。这些渲染器可优化渲染性能，并有助于呈现高质量的视觉效果，包括抗锯齿。

如需渲染笔画，请调用 create() 方法以获取 CanvasStrokeRenderer 实例，然后调用 draw() 方法，以将已完成 (Stroke) 或正在进行 (InProgressStroke) 的笔画渲染到 Canvas 上。

您可以在绘制笔画时转换画布。例如平移、缩放和旋转。为了正确渲染描边，您还必须将 canvas 转换传递给 CanvasStrokeRenderer.draw。

为避免单独跟踪 canvas 转换，请改用 ViewStrokeRenderer。

存储

存储模块提供用于高效序列化和反序列化笔画数据的实用程序，主要侧重于 StrokeInputBatch。

该模块使用 Protocol Buffer 和优化的增量压缩技术，与简单的方法相比，可显著节省存储空间。

存储模块简化了笔画的保存、加载和分享。