import { parse, stringify } from 'wellknown'; import circle from '@turf/circle'; export const loadImage = (url) => new Promise((imageLoaded) => { const image = new Image(); image.onload = () => imageLoaded(image); image.src = url; }); const canvasTintImage = (image, color) => { const canvas = document.createElement('canvas'); canvas.width = image.width * devicePixelRatio; canvas.height = image.height * devicePixelRatio; canvas.style.width = `${image.width}px`; canvas.style.height = `${image.height}px`; const context = canvas.getContext('2d'); context.save(); context.fillStyle = color; context.globalAlpha = 1; context.fillRect(0, 0, canvas.width, canvas.height); context.globalCompositeOperation = 'destination-atop'; context.globalAlpha = 1; context.drawImage(image, 0, 0, canvas.width, canvas.height); context.restore(); return canvas; }; export const prepareIcon = (background, icon, color) => { const canvas = document.createElement('canvas'); canvas.width = background.width * devicePixelRatio; canvas.height = background.height * devicePixelRatio; 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 (icon) { const iconRatio = 0.5; const imageWidth = canvas.width * iconRatio; const imageHeight = canvas.height * iconRatio; if (navigator.userAgent.indexOf('Firefox') > 0) { context.drawImage(icon, (canvas.width - imageWidth) / 2, (canvas.height - imageHeight) / 2, imageWidth, imageHeight); } else { context.drawImage(canvasTintImage(icon, color), (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; } if (Array.isArray(it)) { if (it.length === 2 && !Number.isNaN(it[0]) && !Number.isNaN(it[1])) { return [it[1], it[0]]; } return it.map((it) => reverseCoordinates(it)); } return { ...it, coordinates: reverseCoordinates(it.coordinates), }; }; export const geofenceToFeature = (item) => { if (item.area.indexOf('CIRCLE') > -1) { const coordinates = item.area.replace(/CIRCLE|\(|\)|,/g, ' ').trim().split(/ +/); const options = { steps: 32, units: 'meters' }; const polygon = circle([Number(coordinates[1]), Number(coordinates[0])], Number(coordinates[2]), options); return { id: item.id, type: 'Feature', geometry: polygon.geometry, properties: { name: item.name }, }; } return { id: item.id, type: 'Feature', geometry: reverseCoordinates(parse(item.area)), properties: { name: item.name }, }; }; export const geometryToArea = (geometry) => stringify(reverseCoordinates(geometry));