Core/Movement: Replace old TargetedMovementGenerator into ChaseMovementGenerator and FollowMovementGenerator, full rewrite for both.

- Chase to angle is now functional. Pets use this to chase behind the target. Closes #19925.
- Chase to arbitrary range interval works. Not used anywhere, but you can technically make hunter-like mobs.
- Pets now follow the hunter cleanly and without stutter stepping. Also fix some other things. Closes #8924.

(cherry picked from commit 2a84562dc85516f432bb1e5de9add23c28b26ce4)

1 files changed, 36 insertions, 0 deletions

diff --git a/src/server/game/Movement/AbstractFollower.h b/src/server/game/Movement/AbstractFollower.h
new file mode 100644
index 00000000000..bd3930b89bc
--- /dev/null
+++ b/src/server/game/Movement/AbstractFollower.h
@@ -0,0 +1,36 @@
+/*
+ * This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef TRINITY_ABSTRACTFOLLOWER_H
+#define TRINITY_ABSTRACTFOLLOWER_H
+
+class Unit;
+
+struct AbstractFollower
+{
+    public:
+        AbstractFollower(Unit* target = nullptr) { SetTarget(target); }
+        ~AbstractFollower() { SetTarget(nullptr); }
+
+        void SetTarget(Unit* unit);
+        Unit* GetTarget() const { return _target; }
+
+    private:
+        Unit* _target = nullptr;
+};
+
+#endif