flutter pub add pencil_field根據套件公開資料產生的選型評估，僅供參考。
Pencil_Field 是一個 Flutter 套件，可在 Android、iOS、macOS、Windows 和 Linux 等多個平台實現精確的觸控筆與鉛筆互動，適用於繪圖、書寫與擦除。它支援使用者輸入的版本化持久化，確保草圖與註解能可靠地儲存與還原。設計時著重跨裝置相容性，無論硬體差異為何，皆能提供一致的效能表現。非常適合需要數位墨水功能的應用程式，例如筆記記錄、簽名擷取或創意繪圖工具。
以下為關聯原始碼儲存庫的 README 原文快照，最新內容請造訪原始碼儲存庫。
Widget for pencil / stylus input on different devices and platforms. This widget is intended for any freehand input like signatures or drawings.
Just create PencilField widget and embedd it into your page:
PencilField(
controller: widget.controller,
pencilPaint: pencilPaint,
onPencilDrawingChanged: widget.onPencilDrawingChanged,
decoration: PencilDecoration(
type: PencilDecorationType.chequered,
backgroundColor: Colors.white,
patternColor: Colors.grey[300]!,
numberOfLines: 10,
strokeWidth: 2,
padding: const EdgeInsets.all(10),
),
pencilOnly: true,
)
And resulting input can be displayed like so. As everything is stored in vector format scaling (e.g. for creating previews) is easy:
PencilDisplay(
pencilDrawing: widget.controller.drawing.scale(
scale: scale,
),
decoration: PencilDecoration(backgroundColor: Colors.white),
)
The actual widget that provides the capability to capture and store freehand / pencil input. Each PencilField requires a controller that builds the bridge between the widget and PencilDrawing that stores the input.
PencilDrawing stores the actual content captured by PencilField. You can store and retrieve this data in a versioned format, so that future version of PencilField can load old data.
A full example is provided. This example shows how to use PencilField and its litte sibling PencilDisplay. It also shows how to define pens for input and interactions like erase, undo and clear.
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