--- a/nodejs/X_supp_njs.c	Mon Jun 07 11:42:45 2010 +0800
+++ b/nodejs/X_supp_njs.c	Mon Jun 07 11:47:34 2010 +0800
@@ -10,19 +10,12 @@
 #include <ev.h>
 #include "mb_X_supp.h"
 #include "mb_tools.h"
+#include "X_supp_njs.h"
 
 #ifndef ASSERT
 #define ASSERT(x)
 #endif
 
-typedef struct _njs_runtime {
-    ev_io iowatcher;
-    ev_timer tmwatcher;
-    int enable_io;
-    int enable_timer;
-    void *xrt;
-} njs_runtime_t;
-
 static void timer_cb(EV_P_ ev_timer *tmwatcher, int revent);
 
 /*! \brief Register next timeout with libev.

--- a/nodejs/X_supp_njs.h	Mon Jun 07 11:42:45 2010 +0800
+++ b/nodejs/X_supp_njs.h	Mon Jun 07 11:47:34 2010 +0800
@@ -1,8 +1,15 @@
 #ifndef __X_SUPP_NJS_H_
 #define __X_SUPP_NJS_H_
 
-struct _njs_runtime;
-typedef struct _njs_runtime njs_runtime_t;
+#include <ev.h>
+
+typedef struct _njs_runtime {
+    ev_io iowatcher;
+    ev_timer tmwatcher;
+    int enable_io;
+    int enable_timer;
+    void *xrt;
+} njs_runtime_t;
 
 extern void X_njs_MB_init_handle_connection(njs_runtime_t *rt);
 extern void X_njs_MB_free(njs_runtime_t *rt);

--- a/nodejs/coord.cc	Mon Jun 07 11:42:45 2010 +0800
+++ b/nodejs/coord.cc	Mon Jun 07 11:47:34 2010 +0800
@@ -8,6 +8,12 @@
 #include "X_supp_njs.h"
 }
 
+#include "mbfly_njs.h"
+
+#ifndef ASSERT
+#define ASSERT(x)
+#endif
+
 using namespace v8;
 
 static Handle<Value>
@@ -16,15 +22,12 @@
     Handle<Object> self;
     coord_t *coord;
     co_aix v;
-    Handle<Value> exc;
 
-    if(index < 0 || index >= 6) {
-	exc = Exception::Error(String::New("Invalid index"));
-	return ThrowException(exc);
-    }
+    if(index < 0 || index >= 6)
+	THROW("Invalid index");
     
     self = info.This();
-    coord = (coord_t *)External::Unwrap(self->Get(String::New("_njs_coord")));
+    coord = (coord_t *)UNWRAP(self);
     v = coord_get_matrix(coord)[index];
 
     return Number::New(v);
@@ -36,28 +39,84 @@
     
     HandleScope scope;
     Handle<Object> self;
+    Handle<Object> js_rt;
     redraw_man_t *rdman;
     coord_t *coord;
     co_aix v;
-    Handle<Value> exc;
 
-    if(index < 0 || index >= 6) {
-	exc = Exception::Error(String::New("Invalid index"));
-	return ThrowException(exc);
-    }
-    if(!value->IsNumber()) {
-	exc = Exception::Error(String::New("Invalid value"));
-	return ThrowException(exc);
-    }
+    if(index < 0 || index >= 6)
+	THROW("Invalid Index");
+    if(!value->IsNumber())
+	THROW("Invalid value");
 
     self = info.This();
-    coord = (coord_t *)External::Unwrap(self->Get(String::New("_njs_coord")));
+    coord = (coord_t *)UNWRAP(self);
     v = value->NumberValue();
     coord_get_matrix(coord)[index] = v;
 
-    rdman = (redraw_man_t *)
-	External::Unwrap(self->Get(String::New("_njs_rdman")));
+    js_rt = GET(self, "mbrt")->ToObject();
+    rdman = xnjsmb_rt_rdman(js_rt);
     rdman_coord_changed(rdman, coord);
 
     return value;
 }
+
+static Persistent<ObjectTemplate> coord_obj_temp;
+
+static void
+xnjsmb_init_temp(void) {
+    coord_obj_temp = Persistent<ObjectTemplate>(ObjectTemplate::New());
+    coord_obj_temp->SetIndexedPropertyHandler(xnjsmb_coord_get_index,
+					      xnjsmb_coord_set_index);
+    coord_obj_temp->SetInternalFieldCount(1);
+}
+
+/*! \brief Create a coord object associated with the rdman of the runtime.
+ *
+ * Two internal fields, coord and rdman.
+ */
+Handle<Value>
+xnjsmb_coord_new(const Arguments &args) {
+    HandleScope scope;
+    Handle<Object> js_rt;
+    Handle<Object> coord_obj, parent_obj;
+    njs_runtime_t *rt;
+    redraw_man_t *rdman;
+    coord_t *coord, *parent = NULL;
+    int argc;
+    static int init_temp = 0;
+
+    if(!init_temp) {
+	xnjsmb_init_temp();
+	init_temp = 1;
+    }
+
+    argc = args.Length();
+    if(argc > 1)
+	THROW("Too many arguments (> 1)");
+
+    js_rt = args.This();
+    rt = (njs_runtime_t *)UNWRAP(js_rt);
+    rdman = X_njs_MB_rdman(rt);
+
+    if(argc == 1) {
+	parent_obj = args[0]->ToObject();
+	parent = (coord_t *)UNWRAP(parent_obj);
+    }
+    
+    /*
+     * Set Javascript object
+     */
+    coord = rdman_coord_new(rdman, parent);
+    ASSERT(coord != NULL);
+    
+    coord_obj = coord_obj_temp->NewInstance();
+    ASSERT(coord_obj != NULL);
+    WRAP(coord_obj, coord);
+
+    if(parent != NULL)
+	SET(coord_obj, "parent", parent_obj);
+    SET(coord_obj, "mbrt", js_rt);
+
+    return coord_obj;
+}