fromJson static method

GizmoPrimitive? fromJson(Object? json)

Decodes one tagged primitive, or null for malformed entries and kinds this build does not know (newer manifests degrade to fewer primitives).

Implementation

static GizmoPrimitive? fromJson(Object? json) {
  if (json is! Map) return null;
  final visibility =
      GizmoVisibility.values.asNameMap()[json['visibility']] ??
      GizmoVisibility.always;
  final color = GizmoColor.fromJson(json['color']);
  final xray = json['xray'] != false;
  final when = GizmoCondition.fromJson(json['when']);
  GizmoScalar scalar(String key, double fallback) =>
      GizmoScalar.fromJson(json[key]) ?? GizmoScalar(fallback);
  List<double>? vector(String key) {
    final raw = json[key];
    if (raw is! List || !raw.every((c) => c is num)) return null;
    return [for (final component in raw) (component as num).toDouble()];
  }

  switch (json['kind']) {
    case 'icon':
      return GizmoIcon(
        glyph: json['glyph'] is String ? json['glyph'] as String : null,
        size: (json['size'] as num?)?.toDouble() ?? 28,
        color: color,
        when: when,
      );
    case 'arrow':
      return GizmoArrow(
        axis: vector('axis') ?? const [0, 0, 1],
        axisBind: json['axisBind'] is String
            ? json['axisBind'] as String
            : null,
        length: scalar('length', 1),
        visibility: visibility,
        color: color,
        xray: xray,
        when: when,
      );
    case 'lines':
      final points = vector('points');
      if (points == null) return null;
      return GizmoLines(
        points,
        visibility: visibility,
        color: color,
        xray: xray,
        when: when,
      );
    case 'wireSphere':
      return GizmoWireSphere(
        radius: scalar('radius', 1),
        center: vector('center') ?? const [0, 0, 0],
        inflate: scalar('inflate', 0),
        visibility: visibility,
        color: color,
        xray: xray,
        when: when,
      );
    case 'wireBox':
      return GizmoWireBox(
        halfExtents: vector('halfExtents'),
        halfExtentsBind: json['halfExtentsBind'] is String
            ? json['halfExtentsBind'] as String
            : null,
        center: vector('center') ?? const [0, 0, 0],
        inflate: scalar('inflate', 0),
        visibility: visibility,
        color: color,
        xray: xray,
        when: when,
      );
    case 'wireRect':
      return GizmoWireRect(
        width: scalar('width', 1),
        height: scalar('height', 1),
        axis: vector('axis') ?? const [0, 0, 1],
        visibility: visibility,
        color: color,
        xray: xray,
        when: when,
      );
    case 'wireCircle':
      return GizmoWireCircle(
        radius: scalar('radius', 1),
        axis: vector('axis') ?? const [0, 0, 1],
        visibility: visibility,
        color: color,
        xray: xray,
        when: when,
      );
    case 'wireCone':
      return GizmoWireCone(
        angle: scalar('angle', 0.5),
        range: scalar('range', 1),
        axis: vector('axis') ?? const [0, 0, 1],
        axisBind: json['axisBind'] is String
            ? json['axisBind'] as String
            : null,
        visibility: visibility,
        color: color,
        xray: xray,
        when: when,
      );
    case 'wireCapsule':
      return GizmoWireCapsule(
        radius: scalar('radius', 0.5),
        halfHeight: scalar('halfHeight', 0.5),
        axis: vector('axis') ?? const [0, 1, 0],
        visibility: visibility,
        color: color,
        xray: xray,
        when: when,
      );
    case 'wireCylinder':
      return GizmoWireCylinder(
        radius: scalar('radius', 0.5),
        halfHeight: scalar('halfHeight', 0.5),
        axis: vector('axis') ?? const [0, 1, 0],
        visibility: visibility,
        color: color,
        xray: xray,
        when: when,
      );
    case 'frustum':
      return GizmoFrustum(
        fovY: scalar('fovY', 0.8),
        near: scalar('near', 0.1),
        far: scalar('far', 1000),
        aspect: GizmoScalar.fromJson(json['aspect']),
        visibility: visibility,
        color: color,
        xray: xray,
        when: when,
      );
  }
  return null;
}