3 files changed, 18 insertions, 5 deletions
diff --git a/rotord/src/graph.cpp b/rotord/src/graph.cpp
index dc3e13e..9536fdc 100644
--- a/rotord/src/graph.cpp
+++ b/rotord/src/graph.cpp
@@ -33,11 +33,22 @@ bool Graph::signal_render(string &signal_xml,const float framerate) {
 	return false;
 }
 */
-bool Graph::preview(xmlIO &XML,string node,int w,int h){
+bool Graph::preview(xmlIO &XML,string node,int frame,int w,int h){
 	//
 	//bool imencode(const string& ext, InputArray img, vector<uchar>& buf, const vector<int>& params=vector<int>())
-
-	return true;
+	//if (find_node_id)
+	if (nodes.find(node)!=nodes.end()){
+		float t=frame*framerate;
+		if (dynamic_cast<Signal_node*>(nodes[node])){
+			Time_spec ts=Time_spec(t,framerate,0.0f);
+			XML.addValue("signal",dynamic_cast<Signal_node*>(nodes[node])->get_output(ts));
+			return true;
+		}
+		if (dynamic_cast<Image_node*>(nodes[node])){
+			return true;	
+		}
+	}
+	return false;
 }
 
 bool Graph::video_render(const string &output_filename,const string &audio_filename,const float framerate,float& progress) {
diff --git a/rotord/src/rendercontext.cpp b/rotord/src/rendercontext.cpp
index a5bb54f..b93f39d 100644
--- a/rotord/src/rendercontext.cpp
+++ b/rotord/src/rendercontext.cpp
@@ -312,7 +312,7 @@ void Render_context::session_command(const Session_command& command,xmlIO& XML,H
 					int frame=root["frame"].asInt();
 					int width=root["width"].asInt();
 					int height=root["height"].asInt();
-					if (graph.preview(XML,preview_node,width,height)) {
+					if (graph.preview(XML,preview_node,frame,width,height)) {
 						status=HTTPResponse::HTTP_OK;
 					}
 					else {
diff --git a/rotord/src/rotor.h b/rotord/src/rotor.h
index f52c212..299510a 100755
--- a/rotord/src/rotor.h
+++ b/rotord/src/rotor.h
@@ -1199,6 +1199,7 @@ namespace Rotor {
 				uid=_uid;
 				description=_desc;
 				duration=20.0f;
+				framerate=25.0f;
 			};
 			string uid;								//every version of a graph has a UUID, no particular need to actually read its data(?)
 													//?? is it faster than using strings??
@@ -1213,9 +1214,10 @@ namespace Rotor {
 			bool parseXml(string media_path);
 			bool parseJson(string &data,string &media_path);
 			bool set_resolution(int w,int h);
-			bool preview(xmlIO &XML,string node,int w,int h);
+			bool preview(xmlIO &XML,string node,int frame,int w,int h);
 			bool loaded;
 			float duration;
+			float framerate;
 			const string toString();
 			xmlIO xml;
 		private: