faceInfoLabelText function

String faceInfoLabelText(Face face, { bool showClassification = false, })

Builds the compact per-face info text drawn by drawFaceInfoLabel: detection confidence (plus mesh confidence when available) on the first line, head pose Euler angles on the second. In fast mode (no mesh) only roll is shown, since pitch/yaw are not estimated there.

When showClassification is true and the face carries blendshape scores (full mode), a third line shows the smile and per-eye open probabilities.

Implementation

String faceInfoLabelText(Face face, {bool showClassification = false}) {
  final StringBuffer buf = StringBuffer(
    'score ${face.score.toStringAsFixed(2)}',
  );
  final double? meshScore = face.meshScore;
  if (meshScore != null) {
    buf.write('  mesh ${meshScore.toStringAsFixed(2)}');
  }
  final HeadEulerAngles? angles = face.headEulerAngles;
  if (angles != null) {
    buf.write('\n');
    if (face.mesh != null) {
      buf
        ..write('P ${angles.x.toStringAsFixed(0)}°  ')
        ..write('Y ${angles.y.toStringAsFixed(0)}°  ')
        ..write('R ${angles.z.toStringAsFixed(0)}°');
    } else {
      buf.write('R ${angles.z.toStringAsFixed(0)}°');
    }
  }
  if (showClassification) {
    final double? smile = face.smilingProbability;
    if (smile != null) {
      buf
        ..write('\nsmile ${smile.toStringAsFixed(2)}  ')
        ..write('eyeL ${face.leftEyeOpenProbability!.toStringAsFixed(2)}  ')
        ..write('eyeR ${face.rightEyeOpenProbability!.toStringAsFixed(2)}');
    }
  }
  return buf.toString();
}