Method drawMarkers

src/staticmaps.js:421–478

* Draw markers to the basemap

()

   *  Draw markers to the basemap
   */
  drawMarkers() {
    const queue = [];
    this.markers.forEach((marker) => {
      queue.push(async () => {
        const top = Math.round(marker.position[1]);
        const left = Math.round(marker.position[0]);

        if (
          top < 0
          || left < 0
          || top > this.height
          || left > this.width
        ) return;

        const markerInstance = await sharp(marker.imgData);

        if (marker.width === null || marker.height === null) {
          const metadata = await markerInstance.metadata();

          if (Number.isFinite(metadata.width) && Number.isFinite(metadata.height)) {
            marker.setSize(metadata.width, metadata.height);
          } else {
            throw new Error(`Cannot detectimage size of marker ${marker.img}. Please define manually!`);
          }
        }

        // Check if resize marker image is needed
        if (
          marker.drawWidth !== marker.width
          || marker.drawHeight !== marker.height
        ) {
          const resizeData = {
            fit: marker.resizeMode,
          };

          if (marker.drawWidth !== marker.width) {
            resizeData.width = marker.drawWidth;
          }

          if (marker.drawHeight !== marker.height) {
            resizeData.height = marker.drawHeight;
          }

          await markerInstance
            .resize(resizeData);
        }

        this.image.image = await sharp(this.image.image)
          .composite([{
            input: await markerInstance.toBuffer(),
            top,
            left,
          }])
          .toBuffer();
      });
    });
    return asyncQueue(queue);
  }