--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nodejs/component.js	Wed Apr 06 07:51:06 2011 +0800
@@ -0,0 +1,118 @@
+var mbfly = require("mbfly");
+var svg = require("./svg");
+var sys=require("sys");
+/*
+The Component and ComponentManager is used to keep track of the symbol 
+table in different frame. 
+
+
+*/
+function mul(a,b)
+{
+    var m = [a[0]*b[0]+a[1]*b[3], a[0]*b[1]+a[1]*b[4], a[0]*b[2]+a[1]*b[5]+a[2], 
+            a[3]*b[0]+a[4]*b[3], a[3]*b[1]+a[4]*b[4], a[3]*b[2]+a[4]*b[5]+a[5]];
+	a[0] = m[0];
+	a[1] = m[1];
+	a[2] = m[2];
+	a[3] = m[3];
+	a[4] = m[4];
+	a[5] = m[5];
+}
+
+function Component(app, name) {
+    this.app = app;
+	this.name = name;
+	this.coord = null;
+}
+
+Component.prototype.translate=function(tx,ty) {
+    if (this.coord) {
+	    mul(this.coord, [1,0,tx,0,1,ty]);
+	}
+}
+
+Component.prototype.resize=function(sx,sy) {
+
+    if (this.coord) {
+	    mul(this.coord, [sx,0,0,0,sy,0]);
+	}
+}
+
+Component.prototype.set=function(m) {
+
+    if (this.coord) {
+	    this.coord[0] = m[0];
+	    this.coord[1] = m[1];
+	    this.coord[2] = m[2];
+	    this.coord[3] = m[3];
+	    this.coord[4] = m[4];
+	    this.coord[5] = m[5];
+	}
+}
+Component.prototype.hide=function(m) {
+    if (this.coord) {
+	    this.coord.hide();
+	}
+}
+
+Component.prototype.show=function(m) {
+    if (this.coord) {
+	    this.coord.show();
+	}
+}
+
+Component.prototype.search=function() {
+    this.coord = this.app._componentmanager.search(this.name);
+}
+
+Component.prototype.realize=function() {
+    if (this.coord == null) {
+	    this.search();
+	}
+	return this.coord;
+}
+
+Component.prototype.toCoord=function() {
+   return this.coord; 
+}
+
+
+function ComponentManager(app)
+{
+    this.app = app;
+	this.object_table = {};
+}
+
+/*  \brief add an object into the current current component table. 
+ *  This first argument is the source node of the screen object. 
+ *  The second argument is the coord object which is displayed at
+ *  the screen now. 
+ *     
+ *  We need to use the soucer node to get the name of the object.
+ */
+ComponentManager.prototype.add=function(source,obj) {
+    if (source.refid==undefined) {
+	    sys.puts("Internal Error: no refid is defined\n");
+		return;
+	}
+    this.object_table[source.refid] = obj;
+}
+
+
+ComponentManager.prototype.del=function(name) {
+    delete this.object_table[name];
+}
+
+ComponentManager.prototype.dump=function(name) {
+    for(i in this.object_table) {
+	    sys.puts(i);
+	}
+}
+
+ComponentManager.prototype.search=function(name) {
+    return this.object_table[name];
+}
+
+
+exports.Component = Component;
+exports.ComponentManager = ComponentManager;