1 files changed, 123 insertions, 0 deletions
diff --git a/src/clientlinkableobject.cpp b/src/clientlinkableobject.cpp
new file mode 100644
index 000000000..917edbd53
--- /dev/null
+++ b/src/clientlinkableobject.cpp
@@ -0,0 +1,123 @@
+/*
+Minetest-c55
+Copyright (C) 2010-2012 celeron55, Perttu Ahola <celeron55@gmail.com>
+Copyright (C) 2012 sapier sapier at gmx dot net
+
+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, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "clientlinkableobject.h"
+
+ClientLinkableObject::ClientLinkableObject() {
+
+	this->m_Parent = NULL;
+}
+
+ClientLinkableObject::~ClientLinkableObject() {
+	if (this->isLinked())
+		this->unlink(this);
+}
+
+
+void ClientLinkableObject::link(ClientLinkableObject* entity) {
+	//TODO check if entity is already linkt (shouldn't be the case but just to be sure)
+	this->m_LinkedObjects.push_back(entity);
+}
+
+void ClientLinkableObject::unlink(ClientLinkableObject* entity) {
+	this->m_LinkedObjects.remove(entity);
+}
+
+
+void ClientLinkableObject::stepLinkedObjects(v3f pos,float dtime) {
+	for(std::list<ClientLinkableObject*>::iterator i = this->m_LinkedObjects.begin();
+			i != this->m_LinkedObjects.end(); i++) {
+			(*i)->setPosition(pos,dtime);
+	}
+}
+
+bool ClientLinkableObject::handleLinkUnlinkMessages(u8 cmd,std::istringstream* is,ClientEnvironment *m_env) {
+	if(cmd == AO_Message_type::Link) // Link entity
+		{
+			//Object to link entity to
+			u16 object_id = readU16(*is);
+			//offset against linked object
+			v3f offset    = readV3F1000(*is);
+
+			ClientActiveObject* parent_cao = m_env->getActiveObject(object_id);
+
+			ClientLinkableObject* parent = dynamic_cast<ClientLinkableObject*>(parent_cao);
+
+			if (parent != NULL) {
+				this->linkEntity(offset,parent);
+			}
+			else {
+				errorstream << "Invalid object to link to!" << std::endl;
+			}
+			return true;
+
+		}
+	else if(cmd == AO_Message_type::UnLink) // UnLink entity
+		{
+			if (this->m_Parent == NULL) {
+				errorstream << "Unlinking object not linked!" << std::endl;
+			}
+
+			this->unlinkEntity();
+			return true;
+		}
+
+	return false;
+}
+
+
+bool ClientLinkableObject::linkEntity(v3f offset, ClientLinkableObject* parent) {
+	//already linked unlink first
+	if (this->m_Parent != NULL) {
+		return false;
+	}
+
+	//TODO add linkchain support
+	if (this->m_LinkedObjects.size() > 0) {
+		return false;
+	}
+
+	parent->link(this);
+	updateLinkState(true);
+	this->m_linkOffset 	= offset;
+	this->m_Parent 	 	= parent;
+	return true;
+}
+
+
+bool ClientLinkableObject::unlinkEntity() {
+	if (this->m_Parent != NULL) {
+
+			updateLinkState(false);
+			this->m_Parent->unlink(this);
+			this->m_Parent = NULL;
+			return true;
+
+		}
+
+		return false;
+}
+
+bool ClientLinkableObject::isLinked() {
+	if (this->m_Parent != NULL)
+		return true;
+	else
+		return false;
+}