# Class: LnglatProjection
LnglatProjection 经纬度坐标投影.
Example:
const mapExtent = new GeoBounds(new GeoPoint(10, 20), new GeoPoint(80, 90));
const prj = new LnglatProjection(mapExtent);
const pt = [30, 30];
const latlng = prj.toLngLat(pt);
const pt_geo = prj.fromLngLat(latlng);
const mkt = prj.toMercator(pt);
const pt_mkt = prj.fromMercator(mkt);
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# Hierarchy
-
↳ LnglatProjection
# Table of contents
# Constructors
# Properties
# Methods
- fromLngLat
- fromMercator
- fromMeter
- getMapExtent
- setExtent
- toLngLat
- toMercator
- toMeter
- lngLat2Mercator
- mercator2LngLat
# Constructors
# constructor
+ new LnglatProjection(): LnglatProjection
GeoBounds 构造函数
extent extent - 地图地理范围.
Returns: LnglatProjection
Overrides: Projection
# Properties
# mapExtent
• mapExtent: GeoBounds
地图地理范围.
# EARTH_BOUNDS
▪ Static EARTH_BOUNDS: [number, number, number, number]
The equatorial semi perimeter in meters.
Inherited from: Projection.EARTH_BOUNDS
# EQUATORIAL_SEMIPERIMETER
▪ Static EQUATORIAL_SEMIPERIMETER: number= 20037508.3427892
The equatorial semi perimeter in meters.
Inherited from: Projection.EQUATORIAL_SEMIPERIMETER
# Methods
# fromLngLat
▸ fromLngLat(input: GeoPoint | Feature<Geometry | GeometryCollection, Properties> | FeatureCollection<Geometry | GeometryCollection, Properties> | Geometry | GeometryCollection | [number, number] | [number, number, number] | { x: number ; y: number ; z?: number } | { lat: number ; lng: number } | { lat: number ; lon: number } | GeoPointLike[]): GeoPoint | Feature<Geometry | GeometryCollection, Properties> | FeatureCollection<Geometry | GeometryCollection, Properties> | Geometry | GeometryCollection | [number, number] | [number, number, number] | { x: number ; y: number ; z?: number } | { lat: number ; lng: number } | { lat: number ; lon: number } | GeoPointLike[]
经纬度转地图地理坐标
# Parameters
| Name | Type | Description |
|---|---|---|
input | GeoPoint | Feature<Geometry | GeometryCollection, Properties> | FeatureCollection<Geometry | GeometryCollection, Properties> | Geometry | GeometryCollection | [number, number] | [number, number, number] | { x: number ; y: number ; z?: number } | { lat: number ; lng: number } | { lat: number ; lon: number } | GeoPointLike[] | 经纬度坐标点 |
Returns: GeoPoint | Feature<Geometry | GeometryCollection, Properties> | FeatureCollection<Geometry | GeometryCollection, Properties> | Geometry | GeometryCollection | [number, number] | [number, number, number] | { x: number ; y: number ; z?: number } | { lat: number ; lng: number } | { lat: number ; lon: number } | GeoPointLike[]
Overrides: Projection
# fromMercator
▸ fromMercator(input: GeoPointLike): [number, number]
墨卡托(epsg:3857)转坐标
# Parameters
| Name | Type | Description |
|---|---|---|
input | GeoPointLike | 墨卡托坐标点 |
Returns: [number, number]
Overrides: Projection
# fromMeter
▸ fromMeter(meter: number): number
把米转化为距离
# Parameters
| Name | Type |
|---|---|
meter | number |
Returns: number
Overrides: Projection
# getMapExtent
▸ getMapExtent(): GeoBounds
得到地图范围
Returns: GeoBounds
Overrides: Projection
# setExtent
▸ setExtent(extent: GeoBounds): void
设置地图范围
extent extent - 地图地理范围.
# Parameters
| Name | Type |
|---|---|
extent | GeoBounds |
Returns: void
# toLngLat
▸ toLngLat(input: GeoPoint | Feature<Geometry | GeometryCollection, Properties> | FeatureCollection<Geometry | GeometryCollection, Properties> | Geometry | GeometryCollection | [number, number] | [number, number, number] | { x: number ; y: number ; z?: number } | { lat: number ; lng: number } | { lat: number ; lon: number } | GeoPointLike[]): LngLatLike
地图地理坐标转经纬度
# Parameters
| Name | Type | Description |
|---|---|---|
input | GeoPoint | Feature<Geometry | GeometryCollection, Properties> | FeatureCollection<Geometry | GeometryCollection, Properties> | Geometry | GeometryCollection | [number, number] | [number, number, number] | { x: number ; y: number ; z?: number } | { lat: number ; lng: number } | { lat: number ; lon: number } | GeoPointLike[] | 地理坐标点 |
Returns: LngLatLike
Overrides: Projection
# toMercator
▸ toMercator(input: GeoPointLike): [number, number]
坐标转墨卡托(epsg:3857)
# Parameters
| Name | Type | Description |
|---|---|---|
input | GeoPointLike | 坐标点 |
Returns: [number, number]
Overrides: Projection
# toMeter
▸ toMeter(dist: number): number
把距离转化为米
# Parameters
| Name | Type |
|---|---|
dist | number |
Returns: number
Overrides: Projection
# lngLat2Mercator
▸ Static lngLat2Mercator(input: GeoPointLike): [number, number]
经纬度转墨卡托 .
# Parameters
| Name | Type |
|---|---|
input | GeoPointLike |
Returns: [number, number]
Inherited from: Projection
# mercator2LngLat
▸ Static mercator2LngLat(input: GeoPointLike): [number, number]
墨卡托转经纬度 .
# Parameters
| Name | Type |
|---|---|
input | GeoPointLike |
Returns: [number, number]
Inherited from: Projection