SimpleLine class

自由线条绘制内容

支持两种绘制模式：

1. 传统路径模式：直接连接绘制点
2. 贝塞尔曲线模式：使用二次贝塞尔曲线平滑连接，提供更流畅的线条效果

Simple Line Drawing Content

Supports two drawing modes:

1. Traditional path mode: directly connects drawing points
2. Bezier curve mode: uses quadratic bezier curves for smooth connection, providing smoother line effects

Inheritance

• Object
• PaintContent
• SimpleLine

Constructors

SimpleLine({double minPointDistance = 2.0, bool useBezierCurve = true})

SimpleLine.data({double minPointDistance = 2.0, bool useBezierCurve = false, List<Offset>? points, DrawPath? path, required Paint paint})

SimpleLine.fromJson(Map<String, dynamic> data)

factory

Properties

contentType → String

内容类型标识（用于JSON序列化）

no setter, override

hashCode → int

The hash code for this object.

no setter, inherited

minPointDistance → double

最小点距离

final

paint ↔ Paint

画笔配置

getter/setter pair, inherited

path ↔ DrawPath

绘制路径（为了向后兼容保留，用于传统路径模式）

getter/setter pair

points ↔ List<Offset>?

绘制点列表（用于贝塞尔曲线模式）

getter/setter pair

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

useBezierCurve → bool

是否使用贝塞尔曲线

final

Methods

copy() → SimpleLine

复制实例，避免对象引用传递

override

draw(Canvas canvas, Size size, bool deeper) → void

绘制核心方法 canvas 画布对象 size 画布尺寸 deeper 当前是否为底层绘制（true为历史记录层，false为实时绘制层）

override

drawing(Offset nowPoint) → void

绘制过程中调用（手指移动时）

override

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

startDraw(Offset startPoint) → void

开始绘制（手指按下时）

override

toContentJson() → Map<String, dynamic>

转换为JSON内容（子类实现）

override

toJson() → Map<String, dynamic>

转换为JSON对象

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited