CINC/systems/ControlMode.js

export const CONTROL_MODE = {
  SINGLE: 'single',
  GROUP: 'group',
  JOYSTICK: 'joystick'
};

export let activeUnit = null;
export let selectedUnits = [];

export function setActiveUnit(unit) {
  activeUnit = unit;
  // 不再重置selectedUnits数组，这样可以同时选中多个单位
}

export function addToSelection(unit) {
  if (!selectedUnits.includes(unit)) {
    selectedUnits.push(unit);
  }
}

export function clearSelection() {
  activeUnit = null;
  selectedUnits = [];
}