feat(control) 多角色控制

systems/SelectionSystem.js

@@ -0,0 +1,42 @@
+// 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);
+    }
+  }
+}