用於在 Spark AR 中等待任意 Signal 的數值變化

pinInitValues.ts

function pinInitValues<T extends readonly string[]>(signal: ISignal, values: T): Promise<{ [K in T[number]]: number }> {
  const signals = values.reduce((pre, cur) => {
    pre[cur] = signal[cur];
    return pre;
  }, {})

  return new Promise(resolve =>
    Reactive.monitorMany(signals, { fireOnInitialValue: true }).select('newValues').take(1).subscribe(resolve)
  );
}

usage.ts

import Scene from 'Scene';
import Diagnostics from 'Diagnostics';

void async function main() {
  const plane0 = await Scene.root.findFirst('plane0');
  plane0.transform.scale = Reactive.vector(3, 3, 3);

  const scaleBeforeUpdated = plane0.transform.scale.pinLastValue();
  Diagnostics.log(scaleBeforeUpdated.x.pinLastValue()); // 1
  Diagnostics.log(scaleBeforeUpdated.y.pinLastValue()); // 1
  Diagnostics.log(scaleBeforeUpdated.z.pinLastValue()); // 1


  const scaleAfterUpdated = await pinInitValues(plane0.transform.scale, ['x', 'y', 'z'] as const)
  // The `as const` make code hinting work
  Diagnostics.log(scaleAfterUpdated);   // {x:3, y:3, z:3}
  Diagnostics.log(scaleAfterUpdated.x); // 3
  Diagnostics.log(scaleAfterUpdated.y); // 3
  Diagnostics.log(scaleAfterUpdated.z); // 3
}();