fis_lib_measure/lib/process/primitives/polyline.dart

import 'dart:ui';

import 'package:fis_measure/interfaces/date_types/point.dart';
import 'package:fis_measure/interfaces/enums/items.dart';
import 'package:fis_measure/interfaces/process/items/item_metas.dart';
import 'package:fis_measure/interfaces/process/items/item.dart';
import 'package:fis_measure/interfaces/process/items/terms.dart';
import 'package:fis_measure/interfaces/process/items/types.dart';
import 'package:fis_measure/interfaces/process/workspace/point_info.dart';
import 'package:fis_measure/process/calcuators/curve.dart';
import 'package:fis_measure/process/calcuators/calculator.dart';
import 'package:fis_measure/process/items/item.dart';
import 'package:fis_measure/process/items/item_feature.dart';
import 'package:fis_measure/process/primitives/utils/auto_snap.dart';
import 'package:fis_measure/utils/canvas.dart';

import 'area_abstract.dart';

/// 折线多边形
class Polyline extends AreaItemAbstract with AutoSnapMixin {
  Polyline(ItemMeta meta, IMeasureItem? parent) : super(meta, parent);

  static Polyline createAreaPerimeter(ItemMeta meta, [IMeasureItem? parent]) {
    Polyline polygon = Polyline(meta, parent);
    polygon.calculator = AreaPerimeterCal(polygon);
    return polygon;
  }

  static Polyline createCurveLength(ItemMeta meta, [IMeasureItem? parent]) {
    Polyline polygon = Polyline(meta, parent);
    polygon.calculator = CurveLengthCal(polygon);
    polygon.isClosed = false;
    return polygon;
  }

  @override
  bool onExecuteMouse(PointInfo args) {
    if (state == ItemStates.finished) {
      if (args.pointType == PointInfoType.mouseDown) {
        state = ItemStates.waiting;
      }
    }

    if (state == ItemStates.waiting) {
      if (args.pointType == PointInfoType.mouseDown) {
        handleMouseDownWhileWaiting(args);
      }
    } else if (state == ItemStates.running) {
      if (feature == null) return false;
      if (args.pointType == PointInfoType.mouseUp) return false;

      final f = feature!;

      if (args.pointType == PointInfoType.mouseDown) {
        f.innerPoints.add(args);
      } else {
        f.innerPoints.last = args;
      }
      doCalculate();

      checkAutoSnap(args);

      // if (f.startPoint.almostEquals(f.endPoint)) {
      //   doFeatureFinish();
      // }
    }
    return true;
  }

  @override
  bool onExecuteTouch(PointInfo args) {
    // TODO: implement onExecuteTouch
    throw UnimplementedError();
  }

  void handleMouseDownWhileWaiting(PointInfo args) {
    // TODO: 判断是否当前area
    // 转换为Area逻辑位置
    final point = args.toAreaLogicPoint();
    feature = PolylineFeature(this, point);
    if (args.hostVisualArea != null) {
      feature!.hostVisualArea = args.hostVisualArea;
    }
    state = ItemStates.running;
  }
}

class PolylineFeature extends AreaItemFeatureAbstract {
  PolylineFeature(AreaItemAbstract refItem, DPoint point) : super(refItem) {
    innerPoints.add(point.clone());
    innerPoints.add(point.clone());
  }

  @override
  void paint(Canvas canvas, Size size) {
    if (innerPoints.isEmpty) return;

    drawId(canvas, size);

    final startOffset = convert2ViewPoint(size, startPoint).toOffset();

    if (innerPoints.length == 1) {
      drawVertex(canvas, startOffset, true);
      return;
    } else {
      drawVertex(canvas, startOffset);
    }

    final len = innerPoints.length;
    for (var i = 1; i < len; i++) {
      final a = innerPoints[i - 1];
      final b = innerPoints[i];
      final offsetA = convert2ViewPoint(size, a).toOffset();
      final offsetB = convert2ViewPoint(size, b).toOffset();
      canvas.drawDashLine(offsetA, offsetB, 1, 10, paintPan);
      final isLast = len - i == 1;
      if (isLast) {
        drawVertex(canvas, offsetB, isActive);
        if (isClosed) {
          canvas.drawDashLine(offsetB, startOffset, 1, 10, paintLinePan);
        }
      } else {
        drawVertex(canvas, offsetB, false);
      }
    }
  }
}