# PolylineUpdates class

该类主要用以描述Polyline的增删改等更新操作

## Constructors

PolylineUpdates.from (Set <Polyline> previous, Set <Polyline> current)
  通过polyline的前后更新集合构造一个polylineUpdates

## Properties

hashCode → int
  The hash code for this object. [...]
  read-only, override
polylineIdsToRemove ↔ Set <String>
  需要删除的plyline的id集合
  read / write
polylinesToAdd ↔ Set <Polyline>
  用于添加polyline的集合
  read / write
polylinesToChange ↔ Set <Polyline>
  用于更新polyline的集合
  read / write
runtimeType → Type
  A representation of the runtime type of the object.
  read-only, inherited

## Methods

noSuchMethod (Invocation invocation) → dynamic
  Invoked when a non-existent method or property is accessed. [...]
  inherited
toMap () → Map <String, dynamic>
  将对象装换为可序列化的对象
toString () → String
  Returns a string representation of this object.
  override

## Operators

operator == (Object other) → bool
  The equality operator. [...]
  override