fis_lib_measure/lib/process/primitives/utils/auto_snap.dart

import 'package:fis_measure/interfaces/date_types/int_size.dart';
import 'package:fis_measure/interfaces/process/workspace/point_info.dart';
import 'package:fis_measure/process/items/item.dart';
import 'package:fis_measure/process/items/item_feature.dart';
import 'package:flutter/painting.dart';
import 'package:flutter/services.dart';

mixin AutoSnapMixin<T extends MeasureItemFeature> on MeasureItem<T> {
  bool _isSmartMove = false;

  /// 是否启动智能定位
  bool get isSmartMove => _isSmartMove;
  set isSmartMove(bool value) {
    if (value != _isSmartMove) {
      _isSmartMove = value;
    }
  }

  /// 自动结束检测
  bool checkAutoFinish(PointInfo current) {
    if (feature == null || feature!.innerPoints.length < 3) {
      isSmartMove = false;
      return false;
    }

    // final viewport = feature!.hostVisualArea!.viewport!;

    double autoSnapThreshold = 10; //TODO: from config, pixel
    bool isAutoSnap = true; //TODO: from config
    if (isAutoSnap == false) return false;
    final pixelSize = IntSize.fill(
      application.frameData!.width,
      application.frameData!.height,
    ).toDoubleSize();

    final p1 = feature!.innerPoints.first.scale2Size(pixelSize);
    final p2 = current.scale2Size(pixelSize);
    final length = (p1 - p2).length;
    if (length > autoSnapThreshold * 2.0 && !isSmartMove) {
      isSmartMove = true;
    }
    if (length < autoSnapThreshold && isSmartMove) {
      HapticFeedback.heavyImpact();
      doFeatureFinish();
      isSmartMove = false;
      return true;
    } else {
      return false;
    }
  }
}