Fix get map coordinates

[esride-nik]

The "get map coordinates" widget ran into null pointer issues for SRs other than 4326 or 3857. latitude and longitude or map center resp. mouse coordinate are undefined when using a projected coordinate system like 25832 (UTM 32N). First step was to prevent the null pointer errors by adding conditional access (latitude?.toFixed(3)), second step was to project the points if necessary.

[qlqllu]

@esride-nik Thanks for the PR! For the geometry projection, can you try whether this works?

import { geometryUtils } from 'jimu-core'
geometryUtils.projectToSpatialReference()

[grothkha]

using geometryUtils leads to an error

Uncaught (in promise) TypeError: t.equals is not a function
    at Module.<anonymous> (index.js:2:592375)
    at Generator.next (<anonymous>)
    at index.js:2:591904
    at new Promise (<anonymous>)
    at nC (index.js:2:591649)
    at Module.oC (index.js:2:592270)
    at Widget.<anonymous> (widget.tsx:60:27)
    at Generator.next (<anonymous>)
    at set-public-path.ts:7:52
    at new Promise (<anonymous>)

widget.tsx:60:27 is our function call

geometryUtils.projectToSpatialReference([point], { wkid: 4326 } as __esri.SpatialReference)

while parameter "point" is our esri/geometry/Point in wkid 25832

[esride-nik]

Thanks @grothkha! (He's the one with the right service at hand.)
Btw @qlqllu, your documentation doesn't say anything about geometryUtils ;)

[qlqllu]

Could you create a SpatialReference instance? For the documentation, there are still many classes/methods that are not documented yet, we are trying to add more.