blocked on some logic...WIP commit

back/src/Model/Group.ts

@@ -1,4 +1,5 @@
 import {MessageUserPosition} from "./Websocket/MessageUserPosition";
+import { World } from "./World";
 export class Group {
     static readonly MAX_PER_GROUP = 4;
     
@@ -15,4 +16,37 @@ export class Group {
     isFull(): boolean {
         return this.users.length >= Group.MAX_PER_GROUP;
     }
+
+    isPartOfGroup(user: MessageUserPosition): boolean
+    {
+        return this.users.indexOf(user) !== -1;
+    }
+
+    isStillIn(user: MessageUserPosition): boolean
+    {
+        if(!this.isPartOfGroup(user)) {
+            return false;
+        }
+        let stillIn = true;
+        for(let i = 0; i <= this.users.length; i++) {
+            let userInGroup = this.users[i];
+            let distance = World.computeDistance(user.position, userInGroup.position);
+            if(distance > World.MIN_DISTANCE) {
+                stillIn = false;
+                break;
+            }
+        }
+        return stillIn;
+    }
+
+    removeFromGroup(users: MessageUserPosition[]): void
+    {
+        for(let i = 0; i < users.length; i++) {
+            let user = users[i];
+            const index = this.users.indexOf(user, 0);
+            if (index > -1) {
+                this.users.splice(index, 1);
+            }
+        }
+    }
 }