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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));
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