CINC/systems/SelectionSystem.js

// systems/SelectionSystem.js
import { clearSelection, addToSelection, setActiveUnit } from './ControlMode.js';

export class SelectionSystem {
  constructor(scene) {
    this.scene = scene;
    this.selectionBox = null;

    scene.events.on('selection-start', this.onStart, this);
    scene.events.on('selection-end', this.onEnd, this);
  }

  onStart(pos) {
    if (!this.selectionBox) {
      this.selectionBox = this.scene.add.rectangle(pos.x, pos.y, 1, 1, 0x00ff00, 0.3)
        .setStrokeStyle(1, 0xffffff)
        .setVisible(true);
    } else {
      this.selectionBox.setPosition(pos.x, pos.y).setSize(1, 1).setVisible(true);
    }
  }

  onEnd(rect) {
    if (this.selectionBox) {
      this.selectionBox.setVisible(false);
    }

    const units = this.scene.unitGroup.getChildren();
    const selected = units.filter(unit => {
      const unitRect = unit.getBounds();
      return Phaser.Geom.Rectangle.Overlaps(rect, unitRect);
    });

    clearSelection();
    selected.forEach(addToSelection);

    if (selected.length > 0) {
      setActiveUnit(selected[0]); // 激活第一个
      this.scene.events.emit('units-selected', selected);
    }
  }
}