From 701d43b3c398678a6d38e335d2b4e35429f7d980 Mon Sep 17 00:00:00 2001
From: Felipe Alfonso <f.alfonso.espinosa@gmail.com>
Date: Tue, 20 Mar 2018 12:15:14 -0300
Subject: [PATCH] TransformNode Implemented for nested transformations

---
 src/gameobjects/components/TransformNode.js | 175 ++++++++++++++++++++
 1 file changed, 175 insertions(+)
 create mode 100644 src/gameobjects/components/TransformNode.js

diff --git a/src/gameobjects/components/TransformNode.js b/src/gameobjects/components/TransformNode.js
new file mode 100644
index 000000000..cd5648d7c
--- /dev/null
+++ b/src/gameobjects/components/TransformNode.js
@@ -0,0 +1,175 @@
+var Class = require('../../utils/Class');
+
+var Node = new Class({
+
+    initialize:
+
+    function Node(owner)
+    {
+        this.next = this;
+        this.prev = this;
+        this.head = this;
+        this.owner = owner;
+    },
+
+    selfRemove: function ()
+    {
+        this.prev.next = this.next;
+        this.next.prev = this.prev;
+        this.next = this;
+        this.prev = this;
+        this.head = this;
+        return this;
+    },
+
+    getCount: function ()
+    {
+        var count = 0;
+        var head = this.head;
+        var node = head.next;
+
+        for (;node != head; node = node.next)
+        {
+            count += 1;
+        }
+
+        return count;
+    },
+
+    clear: function ()
+    {
+        if (this.head != this)
+        {
+            while (this.next != this)
+            {
+                next.selfRemove();
+            }
+        }
+        else
+        {
+            this.selfRemove();
+        }
+        return this;
+    },
+
+    insertBefore: function (target)
+    {
+        this.selfRemove();
+        this.next = target;
+        this.prev = target.prev;
+        target.prev = this;
+        this.prev.next = this;
+        this.head = target.head;
+        return this;
+    },
+
+    insertAfter: function (target)
+    {
+        this.selfRemove();
+        this.prev = target;
+        this.next = target.next;
+        target.next = this;
+        this.next.prev = this;
+        this.head = target.head;
+        return this;
+    },
+
+    insertBack: function (target)
+    {
+        return this.insertAfter(target.head);
+    },
+
+    insertFront: function (target)
+    {
+        return this.insertBefore(target.head);
+    },
+
+    getTail: function () 
+    {
+        return this.head.prev;
+    }
+});
+
+var TransformData = new Class({
+
+    initialize:
+
+    function TransformData()
+    {
+        this.x = 0.0;
+        this.y = 0.0;
+        this.scaleX = 1.0;
+        this.scaleY = 1.0;
+        this.rotation = 0.0;
+    }
+
+});
+
+var TransformNode = new Class({
+
+    initialize:
+
+    function TransformNode(object)
+    {
+        this.object = object;
+        this.parent = new Node(this);
+        this.children = new Node(this);
+        this.localTransform = new TransformData();
+        this.worldTransform = new TransformData();
+    },
+
+    setParent: function (parent)
+    {
+        this.parent.insertFront(parent.children);
+        return this;
+    },
+
+    add: function (child)
+    {
+        child.setParent(this);
+        return this;
+    },
+
+    removeParent: function ()
+    {
+        this.parent.selfRemove();
+        return this;
+    },
+
+    remove: function (child)
+    {
+        child.removeParent();
+        return this;
+    },
+
+    clearChildren: function ()
+    {
+        this.children.clear();
+        return this;
+    },
+
+    getParentNode: function ()
+    {
+        return this.parent.head.owner;
+    },
+
+    getRootNode: function ()
+    {
+        if (this.parent.head.owner.parent.head.owner === this)
+        {
+            return this;
+        }
+        else
+        {
+            return this.parent.head.owner.getRootNode();
+        }
+    },
+
+    getChildCount: function ()
+    {
+        return this.children.getCount();
+    }
+
+});
+
+module.exports = TransformNode;