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Geoblocks print

This project provides low level functionalities for rendering OpenLayers layers to images of arbitrary resolution.

Supported layers:

  • Mapbox Vector Tiles (MVT);

Supported styles:

  • plain OpenLayers style functions;
  • MapBox style processed by the ol-mapbox-style library.

Supported rendering methods:

  • OpenLayers render API (feature complete, default);
  • OpenLayers immediate API (basic, enable with MVTEncoder.useImmediateAPI = true).

Demo

https://geoblocks.github.io/print

image

Using

npm i @geoblocks/print
import MVTEncoder from '@geoblocks/print';
const r = await new MVTEncoder().encodeMVTLayer({
  layer, // a plain OpenLayers MVT layer
  tileResolution, // the resolution to use for fetching features
  styleResolution, // the resolution to use for styling features
  printExtent, // the extent to print
  canvasSize, // the target size in dots of the rendered layer (depends of the dpi)
});

The result is tiled so that each image is reasonably big. Each tile result contains:

  • a base64 encoded image: r[i].baseURL;
  • the OL extent for this image: r[i].extent.

Contributing

contributing