CS2CSWrapper.js

const { spawn } = require("child_process");

class CS2CSWrapper {
  constructor(fromCrs, toCrs, precision = 8) {
    this.fromCrs = fromCrs;
    this.toCrs = toCrs;
    this.precision = precision;
  }

  transformPoint(x, y, z = 0) {
    return new Promise((resolve, reject) => {
      try {
        const command = "cs2cs";
        const args = [
          "--3d",
          `${this.fromCrs}`,
          `${this.toCrs}`,
          "-f",
          `%.${this.precision}f`,
        ];

        const subprocess = spawn(command, args);

        // Prepare the input point string
        const pointString = `${x} ${y} ${z}`;

        subprocess.stdin.write(pointString);
        subprocess.stdin.end();

        // Event handlers for subprocess output
        subprocess.stdout.on("data", (data) => {
          console.log(`Subprocess output: ${data}`);

          // Extract the transformed coordinates
          const transformedX = parseFloat(
            data.toString().split(" ")[0].split("\t")[0]
          );
          const transformedY = parseFloat(
            data.toString().split(" ")[0].split("\t")[1]
          );
          const transformedZ = parseFloat(
            data.toString().split("\n")[0].split(" ")[1]
          );

          resolve({
            x: transformedX,
            y: transformedY,
            z: transformedZ,
          });
        });

        subprocess.stderr.on("data", (data) => {
          console.error(`Subprocess error: ${data}`);
          reject(new Error(data));
        });
      } catch (error) {
        reject(error);
      }
    });
  }
}

module.exports = CS2CSWrapper;