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const TableLayerMetadata = require('./table-layer-metadata')
const {
PointRenderer,
LineRenderer,
PolygonRenderer
} = require('./renderers')
const { calculateBounds } = require('@terraformer/spatial')
const getSpatialReference = require('./get-spatial-reference')
const getGeometryTypeFromGeojson = require('./get-geometry-type-from-geojson')
const normalizeExtent = require('./normalize-extent')
class FeatureLayerMetadata extends TableLayerMetadata {
static create (geojson, options) {
const {
geojson: normalizedGeojson,
options: normalizedOptions
} = FeatureLayerMetadata.normalizeInput(geojson, options)
const layerMetadata = new FeatureLayerMetadata()
return layerMetadata.mixinOverrides(normalizedGeojson, normalizedOptions)
}
constructor () {
super()
Object.assign(this, {
type: 'Feature Layer',
minScale: 0,
maxScale: 0,
canScaleSymbols: false,
drawingInfo: {
renderer: {},
labelingInfo: null
},
extent: {
xmin: -180,
ymin: -90,
xmax: 180,
ymax: 90,
spatialReference: {
wkid: 4326,
latestWkid: 4326
}
},
supportsCoordinatesQuantization: false,
hasLabels: false
})
}
mixinOverrides (geojson = {}, options = {}) {
super.mixinOverrides(geojson, options)
const { renderer, extent, inputCrs, sourceSR, capabilities = {} } = options
this.geometryType = getGeometryTypeFromGeojson({ ...geojson, ...options })
this.supportsCoordinatesQuantization = !!capabilities.quantization
this._setExtent(geojson, { inputCrs, sourceSR, extent })
this._setRenderer(renderer)
this._setDirectOverrides(options)
return this
}
_setExtent (geojson, options) {
const extent = getLayerExtent(geojson, options)
if (extent) {
this.extent = extent
}
}
_setRenderer (renderer) {
if (renderer) {
this.drawingInfo.renderer = renderer
return
}
Iif (this.geometryType === 'esriGeometryPolygon') {
this.drawingInfo.renderer = new PolygonRenderer()
} else Iif (this.geometryType === 'esriGeometryPolyline') {
this.drawingInfo.renderer = new LineRenderer()
} else {
this.drawingInfo.renderer = new PointRenderer()
}
}
_setDirectOverrides (options) {
super._setDirectOverrides(options)
const {
minScale,
maxScale
} = options
_.merge(this, {
minScale,
maxScale
})
}
}
function getLayerExtent (geojson, options) {
const spatialReference = getSpatialReference(geojson, options) || {
wkid: 4326,
latestWkid: 4326
}
const { extent } = options
if (extent) {
return normalizeExtent(extent, spatialReference)
}
return calculateExtentFromFeatures(geojson, spatialReference)
}
function calculateExtentFromFeatures (geojson, spatialReference) {
if (!geojson.features || geojson.features.length === 0) {
return
}
try {
const [xmin, ymin, xmax, ymax] = calculateBounds(geojson)
return {
xmin,
xmax,
ymin,
ymax,
spatialReference
}
} catch (error) {
console.log(`Could not calculate extent from data: ${error.message}`)
}
}
module.exports = FeatureLayerMetadata
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