flutter pub add maps_toolkit根據套件公開資料產生的選型評估，僅供參考。
maps_toolkit 是一個 Flutter/Dart 套件，提供處理地圖所需的必要地理空間工具。它提供計算多邊形面積、計算地理點之間距離，以及確定座標之間方位與偏移的工具——與 Android Maps Utils 庫的功能相符。此套件專為跨平台使用設計，支援 Android、iOS、Web、macOS、Windows 與 Linux。該套件簡化複雜的地理解算，非常適合需要精確測量與空間分析的位置相關應用。
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。
A library for area, distance, heading measurements (spherical_util.dart if port from android-maps-utils).
In your dart/flutter project add the dependency:
dependencies:
...
maps_toolkit: ^3.0.0
A simple usage example:
import 'package:maps_toolkit/maps_toolkit.dart';
main() {
val distanceBetweenPoints = SphericalUtil.computeDistanceBetween(
LatLng(51.5073509, -0.1277583),
LatLng(48.856614, 2.3522219)
);
final p1 = LatLng(45.153474463955796, 39.33852195739747);
final p2 = LatLng(45.153474463955796, 39.33972358703614);
final p3 = LatLng(45.15252112936569, 39.33972358703614);
final p4 = LatLng(45.1525022138355, 39.3385460972786);
val areaInSquareMeters = SphericalUtil.computeArea([p1, p2, p3, p4, p1]);
}
Usage with Google Maps package (specify a prefix for an import):
import 'package:maps_toolkit/maps_toolkit.dart' as mp;
import 'package:google_maps/google_maps.dart';
import 'package:test/test.dart';
void main() {
final pointFromToolkit = mp.LatLng(90, 0);
final pointFromGoogleMap = LatLng(90, 0);
mp.SphericalUtil.computeAngleBetween(pointFromToolkit, pointFromToolkit);
}
SphericalUtil.computeArea - calculate the area of a closed path on Earth.
SphericalUtil.computeDistanceBetween - calculate the distance between two points, in meters.
SphericalUtil.computeHeading - calculate the heading from one point to another point.
SphericalUtil.computeLength - calculate the length of the given path, in meters, on Earth.
SphericalUtil.computeOffset - calculate the point resulting from moving a distance from an origin in the specified heading (expressed in degrees clockwise from north).
SphericalUtil.computeOffsetOrigin - calculate the location of origin when provided with a point destination, meters travelled and original heading.
SphericalUtil.computeSignedArea - calculate the signed area of a closed path on Earth.
SphericalUtil.interpolate - calculate the point which lies the given fraction of the way between the origin and the destination.
PolygonUtil.containsLocation - computes whether the given point lies inside the specified polygon.
PolygonUtil.isLocationOnEdge - computes whether the given point lies on or near the edge of a polygon, within a specified tolerance in meters.
PolygonUtil.isLocationOnPath - computes whether the given point lies on or near a polyline, within a specified tolerance in meters.
PolygonUtil.locationIndexOnPath - computes whether (and where) a given point lies on or near a polyline, within a specified tolerance.
PolygonUtil.locationIndexOnEdgeOrPath - computes whether (and where) a given point lies on or near a polyline, within a specified tolerance.
PolygonUtil.simplify - simplifies the given poly (polyline or polygon) using the Douglas-Peucker decimation algorithm.
PolygonUtil.isClosedPolygon - returns true if the provided list of points is a closed polygon.
PolygonUtil.distanceToLine - computes the distance on the sphere between the point p and the line segment start to end.
PolygonUtil.decode - decodes an encoded path string into a sequence of LatLngs.
PolygonUtil.encode - encodes a sequence of LatLngs into an encoded path string.
Please file feature requests and bugs at the issue tracker.
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