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Merge pull request #130 from Geoportail-Luxembourg/GSLUX-703-draw-too…
…ltip GSLUX-703: Add draw tooltip
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,129 @@ | ||
| import { Overlay } from 'ol' | ||
| import { EventsKey, listen } from 'ol/events' | ||
| import { Projection, transform } from 'ol/proj' | ||
| import { getDistance as haversineDistance, getArea } from 'ol/sphere' | ||
| import { unByKey } from 'ol/Observable' | ||
| import { Circle, Geometry, LineString, Polygon } from 'ol/geom' | ||
| import OlMap from 'ol/Map' | ||
| import { DrawEvent } from 'ol/interaction/Draw' | ||
|
|
||
| class DrawTooltip { | ||
| private measureTooltipElement: HTMLElement | null = null | ||
| private measureTooltipOverlay: Overlay | null = null | ||
| private changeEventKey: EventsKey | null = null | ||
|
|
||
| public add(map: OlMap, event: DrawEvent) { | ||
| this.createMeasureTooltip(map) | ||
| const geometry = event.feature.getGeometry() | ||
| console.assert(geometry !== undefined) | ||
| if (geometry === undefined) return | ||
| const proj = map.getView().getProjection() | ||
|
|
||
| this.changeEventKey = listen( | ||
| geometry, | ||
| 'change', | ||
| () => this.updateTootip(geometry, proj), | ||
| this | ||
| ) | ||
| } | ||
|
|
||
| public remove() { | ||
| this.removeMeasureTooltip() | ||
|
|
||
| if (this.changeEventKey !== null) { | ||
| unByKey(this.changeEventKey) | ||
| this.changeEventKey = null | ||
| } | ||
| } | ||
|
|
||
| private createMeasureTooltip(map: OlMap) { | ||
| this.removeMeasureTooltip() | ||
| this.measureTooltipElement = document.createElement('div') | ||
| this.measureTooltipElement.classList.add('lux-tooltip') | ||
|
|
||
| this.measureTooltipOverlay = new Overlay({ | ||
| element: this.measureTooltipElement, | ||
| offset: [0, -15], | ||
| positioning: 'bottom-center', | ||
| stopEvent: false, | ||
| }) | ||
| map.addOverlay(this.measureTooltipOverlay) | ||
| } | ||
|
|
||
| private removeMeasureTooltip() { | ||
| if (this.measureTooltipElement !== null) { | ||
| this.measureTooltipElement.parentNode?.removeChild( | ||
| this.measureTooltipElement | ||
| ) | ||
| this.measureTooltipElement = null | ||
| this.measureTooltipOverlay = null | ||
| } | ||
| } | ||
|
|
||
| private updateTootip(geometry: Geometry, proj: Projection) { | ||
| let coord = undefined | ||
| let output = '' | ||
| if (geometry.getType() === 'LineString') { | ||
| const geom = geometry as LineString | ||
| coord = geom.getLastCoordinate() | ||
| if (coord !== null) { | ||
| output = this.getFormattedLength(geom, proj) | ||
| } | ||
| } else if (geometry.getType() === 'Polygon') { | ||
| const geom = geometry as Polygon | ||
| const verticesCount = geom.getCoordinates()[0].length | ||
| if (verticesCount > 2) { | ||
| coord = geom.getInteriorPoint().getCoordinates() | ||
| } | ||
| if (coord !== null) { | ||
| output = this.getFormattedArea(geom) | ||
| } | ||
| } else if (geometry.getType() === 'Circle') { | ||
| const geom = geometry as Circle | ||
| coord = geom.getLastCoordinate() | ||
| const center = geom.getCenter() | ||
| if (center !== null && coord !== null) { | ||
| output = this.getFormattedLength(new LineString([center, coord]), proj) | ||
| } | ||
| } | ||
| if (this.measureTooltipElement) { | ||
| this.measureTooltipElement.innerHTML = output | ||
| this.measureTooltipOverlay?.setPosition(coord) | ||
| } | ||
| } | ||
|
|
||
| private getFormattedLength( | ||
| lineString: LineString, | ||
| projection: Projection | ||
| ): string { | ||
| let length = 0 | ||
| const coordinates = lineString.getCoordinates() | ||
| for (let i = 0, ii = coordinates.length - 1; i < ii; ++i) { | ||
| const c1 = transform(coordinates[i], projection, 'EPSG:4326') | ||
| const c2 = transform(coordinates[i + 1], projection, 'EPSG:4326') | ||
| length += haversineDistance(c1, c2) | ||
| } | ||
| let output | ||
| if (length > 1000) { | ||
| output = parseFloat((length / 1000).toPrecision(3)) + ' ' + 'km' | ||
| } else { | ||
| output = parseFloat(length.toPrecision(3)) + ' ' + 'm' | ||
| } | ||
| return output | ||
| } | ||
|
|
||
| private getFormattedArea(polygon: Polygon): string { | ||
| const area = Math.abs(getArea(polygon)) | ||
| let output = '' | ||
| if (area > 1000000) { | ||
| output = | ||
| parseFloat((area / 1000000).toPrecision(3)) + ' ' + 'km<sup>2</sup>' | ||
| } else { | ||
| output = parseFloat(area.toPrecision(3)) + ' ' + 'm<sup>2</sup>' | ||
| } | ||
| return output | ||
| } | ||
| } | ||
|
|
||
| const drawTooltip = new DrawTooltip() | ||
| export default drawTooltip |
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