fis_lib_measure/lib/process/workspace/visual_loader.dart

import 'package:fis_measure/interfaces/date_types/rect_region.dart';
import 'package:fis_measure/process/visual/v2d_visual.dart';
import 'package:fis_measure/process/visual/v3d_visual.dart';
import 'package:fis_measure/process/visual/visual.dart';
import 'package:vid/us/vid_us_2d_visual.dart';
import 'package:vid/us/vid_us_3d_visual.dart';
import 'package:vid/us/vid_us_visual.dart';
import 'package:vid/us/vid_us_visual_type.dart';

class VisualsLoader {
  final List<VidUsVisual> visualDatas;
  final List<VisualBase> _visuals = [];

  VisualsLoader(this.visualDatas);

  List<VisualBase> load() {
    if (visualDatas.length == 1) {
      loadSingleVisual();
    } else if (visualDatas.length == 2) {
      loadTwoVisual();
    } else if (visualDatas.length == 4) {
      loadFourVisual();
    } else {
      loadNoVisual();
    }
    return _visuals;
  }

  void loadVisual(VidUsVisual data, RectRegion region) {
    VisualBase visual;
    if (data.visualType == VidUsVisualType.V3D) {
      data as VidUs3DVisual;
      // TODO: create 3d areas
      visual = V3dVisual(data, region);
    } else {
      data as VidUs2DVisual;

      visual = V2dVisual(data, region);
    }

    _visuals.add(visual);
  }

  //适用于，例如：颈动脉2D下无visuals的情况
  void loadNoVisual() {
    loadVisual(
      VidUs2DVisual(),
      RectRegion.fill(0, 0, 1, 1),
    );
  }

  void loadSingleVisual() {
    loadVisual(
      visualDatas.first,
      RectRegion.fill(0, 0, 1, 1),
    );
  }

  void loadTwoVisual() {
    loadVisual(
      visualDatas[0],
      RectRegion.fill(0, 0, 0.5, 1),
    );
    loadVisual(
      visualDatas[1],
      RectRegion.fill(0.5, 0, 0.5, 1),
    );
  }

  void loadFourVisual() {
    loadVisual(
      visualDatas[0],
      RectRegion.fill(0, 0, 0.5, 0.5),
    );
    loadVisual(
      visualDatas[1],
      RectRegion.fill(0.5, 0, 0.5, 0.5),
    );
    loadVisual(
      visualDatas[2],
      RectRegion.fill(0, 0.5, 0.5, 0.5),
    );
    loadVisual(
      visualDatas[3],
      RectRegion.fill(0.5, 0.5, 0.5, 0.5),
    );
  }
}