@mapgis/webclient-leaflet-plugin
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<h1> MapGIS Client for JavaScript API</h1>
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<div class="category"><div style="font-weight: bold;vertical-align: middle;padding: 0.4rem 0;" class="mapgis-menu-span"><img style="width: 20px;margin-right: 6px;vertical-align: middle;" src="./styles/m.png" alt="">视图模块</div><ul class="mapgis-sidebar-menus"><li><img style="width: 20px;margin-right: 6px;vertical-align: middle;" src="./styles/c.png" alt=""><a href="DrawControl.html">DrawControl</a><span style="display: none;"><p>绘制工具</p></span></li><li><img style="width: 20px;margin-right: 6px;vertical-align: middle;" src="./styles/c.png" alt=""><a href="MapView.html">MapView</a><span style="display: none;"><p>二维场景视图(leaflet引擎)，对地图引擎进行管理，如果要对地图图层进行管理请参考[Map]{@link Map}，<br/>
参考示例：
<a href='#MapView'>[初始化二维场景视图]</a>
<br>[ES5引入方式]：<br/>
Zondy.MapView() <br/>
[ES6引入方式]：<br/>
import { MapView } from '@mapgis/webclient-leaflet-plugin' <br/></p></span></li><li><img style="width: 20px;margin-right: 6px;vertical-align: middle;" src="./styles/c.png" alt=""><a href="Popup.html">Popup</a><span style="display: none;"><p>二维场景信息弹窗(leaflet引擎)
参考示例：
<a href='#MapView'>[初始化二维场景视图]</a>
[ES6引入方式]：<br/>
import { Popup } from '@mapgis/webclient-leaflet-plugin' <br/>
自定义样式说明：<br/>
zondy-popup__content 弹窗容器样式<br/>
zondy-popup__tip 弹窗对话框箭头样式<br/>
zondy-popup__header 弹窗头部样式<br/>
zondy-popup__content 弹窗主体样式<br/>
zondy-popup__footer 弹窗底部样式<br/></p></span></li><li><img style="width: 20px;margin-right: 6px;vertical-align: middle;" src="./styles/c.png" alt=""><a href="Screenshot.html">Screenshot</a><span style="display: none;"><p>屏幕打印工具</p></span></li></ul><div style="font-weight: bold;vertical-align: middle;padding: 0.4rem 0;" class="mapgis-menu-span"><img style="width: 20px;margin-right: 6px;vertical-align: middle;" src="./styles/m.png" alt="">草图编辑模块</div><ul class="mapgis-sidebar-menus"><li><img style="width: 20px;margin-right: 6px;vertical-align: middle;" src="./styles/c.png" alt=""><a href="SketchEditorLeaflet.html">SketchEditorLeaflet</a><span style="display: none;"><p>二维场景草图编辑类<br/>
<br>[ES5引入方式]：<br/>
const { SketchEditorLeaflet } = Zondy <br/>
[ES6引入方式]：<br/>
import { SketchEditorLeaflet } from "@mapgis/webclient-leaflet-plugin" <br/></p></span></li></ul><div style="font-weight: bold;vertical-align: middle;padding: 0.4rem 0;" class="mapgis-menu-span"><img style="width: 20px;margin-right: 6px;vertical-align: middle;" src="./styles/m.png" alt="">渲染器模块</div><ul class="mapgis-sidebar-menus"><li><img style="width: 20px;margin-right: 6px;vertical-align: middle;" src="./styles/c.png" alt=""><a href="Zondy.ThemeLayer.GraphThemeLayer.html">GraphThemeLayer</a><span style="display: none;"><p>统计专题图通过为每个要素绘制统计图表来反映其对应的专题值的大小。它可同时表示多个字段属性信息，在区域本身与各区域之间形成横向和纵向的对比。<br>统计专题图多用于具有相关数量特征的地图上，比如表示不同地区多年的粮食产量、GDP、人口等，不同时段客运量、地铁流量等。目前提供的统计图类型有：柱状图（Bar），折线图（Line），饼图（Pie），三维柱状图（Bar3D），点状图（Point），环状图（Ring）。</p></span></li></ul></div>
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<span class="page-title-sub">util/ConvertGeometryUtil.js</span>
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<pre class="prettyprint source linenums"><code>import {
Projection,
SpatialReference,
GeometryType,
defaultValue,
editGeometryByArc3
} from '@mapgis/webclient-common'
import * as L from '@mapgis/leaflet'
// @function coordsToLatLng(coords: Array): LatLng
// Creates a `LatLng` object from an array of 2 numbers (longitude, latitude)
// or 3 numbers (longitude, latitude, altitude) used in GeoJSON for points.
function coordsToLatLng(coords) {
if (coords.length > 2) {
return new L.LatLng(coords[1], coords[0], coords[2])
}
return new L.LatLng(coords[1], coords[0])
}
// @function coordsToLatLngs(coords: Array, levelsDeep?: Number, coordsToLatLng?: Function): Array
// Creates a multidimensional array of `LatLng`s from a GeoJSON coordinates array.
// `levelsDeep` specifies the nesting level (0 is for an array of points, 1 for an array of arrays of points, etc., 0 by default).
// Can use a custom [`coordsToLatLng`](#geojson-coordstolatlng) function.
function coordsToLatLngs(coords, levelsDeep, _coordsToLatLng) {
const latlngs = []
for (let i = 0, len = coords.length, latlng; i < len; i++) {
latlng = levelsDeep
? coordsToLatLngs(coords[i], levelsDeep - 1, _coordsToLatLng)
: (_coordsToLatLng || coordsToLatLng)(coords[i])
latlngs.push(latlng)
}
return latlngs
}
function transformToWGS84(spatialReference, geo) {
if (String(spatialReference.wkid) !== '4326') {
geo.spatialReference = spatialReference
return Projection.project(geo, new SpatialReference('EPSG:4326'))
}
return geo
}
// 二维转换geometry
class ConvertGeometryUtil {
/**
* @description 转换为leaflet坐标数组,注意leaflet的经纬度对象放置顺序是反的[lat,lng]
* @param {*} geometry
* @param {*} options
* @return {*}
*/
static toLeafletCoords(geometry, options) {
let latlngs = []
// 后面需要考虑几何上坐标系的问题,在此处统一转换为经纬度数据
const opt = defaultValue(options, {})
// 额外参数
const additional = defaultValue(opt.additional, undefined)
// 坐标系转换
let spatialReference = defaultValue(
SpatialReference.fromJSON(opt.spatialReference),
new SpatialReference('EPSG:4326')
)
if (geometry.spatialReference) {
spatialReference = geometry.spatialReference
}
switch (geometry.type) {
case GeometryType.point: {
let geo = geometry.clone()
geo = transformToWGS84(spatialReference, geo)
const coordinates = geo.coordinates
latlngs.push(coordsToLatLng(coordinates))
break
}
case GeometryType.multiPoint: {
let geo = geometry.clone()
geo = transformToWGS84(spatialReference, geo)
const coordinates = geo.coordinates
latlngs = coordsToLatLngs(coordinates, 0, coordsToLatLng)
break
}
case GeometryType.lineString: {
let geo = geometry.clone()
// 处理三点弧段几何
geo = editGeometryByArc3(geo, additional)
geo = transformToWGS84(spatialReference, geo)
const coordinates = geo.coordinates
latlngs = coordsToLatLngs(coordinates, 0, coordsToLatLng)
break
}
case GeometryType.multiLineString: {
let geo = geometry.clone()
// 处理三点弧段几何
geo = editGeometryByArc3(geo, additional)
geo = transformToWGS84(spatialReference, geo)
const coordinates = geo.coordinates
latlngs = coordsToLatLngs(coordinates, 1, coordsToLatLng)
break
}
case GeometryType.polygon: {
let geo = geometry.clone()
// 处理三点弧段几何
geo = editGeometryByArc3(geo, additional)
geo = transformToWGS84(spatialReference, geo)
const coordinates = geo.coordinates
latlngs = coordsToLatLngs(coordinates, 1, coordsToLatLng)
break
}
case GeometryType.multiPolygon: {
let geo = geometry.clone()
// 处理三点弧段几何
geo = editGeometryByArc3(geo, additional)
geo = transformToWGS84(spatialReference, geo)
const coordinates = geo.coordinates
latlngs = coordsToLatLngs(coordinates, 2, coordsToLatLng)
break
}
case GeometryType.extent: {
let geo = geometry.clone()
geo = transformToWGS84(spatialReference, geo)
const minX = geo.xmin
const maxX = geo.xmax
const minY = geo.ymin
const maxY = geo.ymax
latlngs.push([minY, minX])
latlngs.push([maxY, maxX])
break
}
case GeometryType.circle: {
let geo = geometry.clone()
geo = transformToWGS84(spatialReference, geo)
const center = geo.center
latlngs.push([center[1], center[0]])
break
}
default: {
break
}
}
return latlngs
}
}
export default ConvertGeometryUtil
</code></pre>
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