maplibre-gl-map-to-image

npm install maplibre-gl-map-to-image --save

A JavaScript library that generates an HTML image element with a PNG source from a Maplibre GL JS map. The library allows users to customize the map image by selecting which overlays to include or exclude, such as markers, popups, and controls. It also allows the map to fit a bounding box only for the purpose of image generation.

Features

• Generate a PNG image from a Maplibre GL JS map
• Customize the image by selecting which overlays to include:
  • Markers
  • Popups
  • Controls
• Render overlays outside of the main Maplibre WebGL canvas context
• Set the source of an existing HTML img element to the generated PNG data

Future Development

• Direct access to image data for use cases like direct downloading
• Support different image resolutions and aspect ratios that may not match the current map canvas

Dependencies

• htmlToImage

Usage

To use this library, simply call the toPng function and pass in your Maplibre GL JS map instance, along with options for which overlays to include. The function will return a PNG image that can be set as the source of an existing HTML img element.

import { toElement } from 'maplibre-gl-map-to-image';

const map = new maplibregl.Map({
  // your map options here
});

const targetImage = document.getElementById('target-image');

const options = {
    targetImageId, //* @param {string} REQUIRED: The ID of the target image element where the PNG will be set.
    [bbox], //* @param {array} Optional bounding box to fit the map before conversion. Default: null
    coverEdits, //* @param {boolean} Optional flag to hide changes made to the map while preparing the image. Eg. Setting it to a different bounding box. Default: true 
    hideAllControls, //* @param {boolean} Optional flag to hide all map controls during conversion. Default: false
    [hideControlsInCorner], //* @param {array} Optional specific corners to hide controls from. Default: []
    hideMarkers, //* @param {boolean} Optional flag to hide markers during conversion. Default: false
    hidePopups, //* @param {boolean} Optional flag to hide popups during conversion. Default: false
    [hideVisibleLayers], //* @param {array} Optional layer IDs to hide during conversion. Default: []
    [showHiddenLayers], //* @param {array} Optional layer IDs to show during conversion. Default: []
}

await toElement(map, options);

Demo

Source for the demo is in the ./demo folder. To run the demo from the project root folder:

npm install
npm run demo

Check localhost:5173