import wellknown from 'wellknown'; import circle from '@turf/circle'; export const loadImage = (url) => { return new Promise(imageLoaded => { const image = new Image(); image.onload = () => imageLoaded(image); image.src = url; }); }; export const loadIcon = async (background, url) => { const pixelRatio = window.devicePixelRatio; const canvas = document.createElement('canvas'); canvas.width = background.width * pixelRatio; canvas.height = background.height * pixelRatio; canvas.style.width = `${background.width}px`; canvas.style.height = `${background.height}px`; const context = canvas.getContext('2d'); context.drawImage(background, 0, 0, canvas.width, canvas.height); if (url) { const image = await loadImage(url); const iconRatio = 0.5; const imageWidth = canvas.width * iconRatio; const imageHeight = canvas.height * iconRatio; context.drawImage(image, (canvas.width - imageWidth) / 2, (canvas.height - imageHeight) / 2, imageWidth, imageHeight); } return context.getImageData(0, 0, canvas.width, canvas.height); }; export const reverseCoordinates = it => { if (!it) { return it; } else if (Array.isArray(it)) { if (it.length === 2 && !Number.isNaN(it[0]) && !Number.isNaN(it[1])) { return [it[1], it[0]]; } else { return it.map(it => reverseCoordinates(it)); } } else { return { ...it, coordinates: reverseCoordinates(it.coordinates), } } } export const geofenceToFeature = (item) => { if (item.area.indexOf('CIRCLE') > -1) { let coordinates = item.area.replace(/CIRCLE|\(|\)|,/g, " ").trim().split(/ +/); var options = { steps: 32, units: 'meters' }; let polygon = circle([Number(coordinates[1]), Number(coordinates[0])], Number(coordinates[2]), options); return { type: 'Feature', geometry: polygon.geometry, properties: { name: item.name } }; } else { return { type: 'Feature', geometry: reverseCoordinates(wellknown(item.area)), properties: { name: item.name } }; } }