diff --git a/src/libkstmath/relationscriptinterface.cpp b/src/libkstmath/relationscriptinterface.cpp
@@ -0,0 +1,267 @@
+/***************************************************************************
+ *                                                                         *
+ *   copyright : (C) 2014 Barth Netterfield                                *
+ *                   netterfield@astro.utoronto.ca                         *
+ *                                                                         *
+ *   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.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#include "relationscriptinterface.h"
+
+#include "objectstore.h"
+#include "datasourcepluginmanager.h"
+#include "updatemanager.h"
+#include "updateserver.h"
+#include "vector.h"
+#include "colorsequence.h"
+
+#include <QStringBuilder>
+
+
+namespace Kst {
+
+QString doRelationScriptCommand(QString command,Relation *relation) {
+
+  QString v=ScriptInterface::doNamedObjectCommand(command, relation);
+  if (!v.isEmpty()) {
+    return v;
+  }
+
+  if (command.startsWith("maxX(")) {
+    return QString::number(relation->maxX());
+  } // FIXME the rest...
+
+  return QString();
+}
+
+
+/******************************************************/
+/* Curves                                             */
+/******************************************************/
+CurveSI::CurveSI(CurvePtr it) {
+  curve=it;
+
+  _fnMap.insert("setXVector",&CurveSI::setXVector);
+  _fnMap.insert("setYVector",&CurveSI::setYVector);
+  _fnMap.insert("setXError",&CurveSI::setXError);
+  _fnMap.insert("setYError",&CurveSI::setYError);
+  _fnMap.insert("setXMinusError",&CurveSI::setXMinusError);
+  _fnMap.insert("setYMinusError",&CurveSI::setYMinusError);
+
+  _fnMap.insert("setColor",&CurveSI::setColor);
+  _fnMap.insert("setHeadColor",&CurveSI::setHeadColor);
+  _fnMap.insert("setBarFillColor",&CurveSI::setBarFillColor);
+  _fnMap.insert("setHasPoints",&CurveSI::setHasPoints);
+  _fnMap.insert("setHasLines",&CurveSI::setHasLines);
+  _fnMap.insert("setHasBars",&CurveSI::setHasBars);
+  _fnMap.insert("setHasHead",&CurveSI::setHasHead);
+
+  _fnMap.insert("setLineWidth",&CurveSI::setLineWidth);
+  _fnMap.insert("setPointSize",&CurveSI::setPointSize);
+
+}
+
+QString CurveSI::doCommand(QString command_in) {
+  QString command = command_in.left(command_in.indexOf('('));
+
+  CurveInterfaceMemberFn fn=_fnMap.value(command,&CurveSI::noSuchFn);
+
+  if(fn!=&CurveSI::noSuchFn) {
+    return CALL_MEMBER_FN(*this,fn)(command_in);
+  }
+
+
+  QString v=doRelationScriptCommand(command_in, curve);
+  if (!v.isEmpty()) {
+    return v;
+  }
+
+  return "No such command";
+}
+
+bool CurveSI::isValid() {
+  return curve.isPtrValid();
+}
+
+ScriptInterface* CurveSI::newCurve(ObjectStore *store) {
+  CurvePtr curve;
+  curve = store->createObject<Curve>();
+  curve->setColor(ColorSequence::self().next());
+
+  return new CurveSI(curve);
+}
+
+QByteArray CurveSI::endEditUpdate() {
+  curve->registerChange();
+  UpdateManager::self()->doUpdates(true);
+  UpdateServer::self()->requestUpdateSignal();
+  return ("Finished editing "+curve->Name()).toLatin1();
+}
+
+/***************************/
+/* commands                */
+/***************************/
+QString CurveSI::setXVector(QString& command) {
+  QString parameter = getArg(command);
+
+  VectorPtr v = kst_cast<Vector>(curve->store()->retrieveObject(parameter));
+  if (v) {
+    curve->setXVector(v);
+    return "Done";
+  } else {
+    return QString("Vector %1 not found").arg(parameter);
+  }
+
+}
+
+QString CurveSI::setYVector(QString& command) {
+  QString parameter = getArg(command);
+
+  VectorPtr v = kst_cast<Vector>(curve->store()->retrieveObject(parameter));
+  if (v) {
+    curve->setYVector(v);
+    return "Done";
+  } else {
+    return QString("Vector %1 not found").arg(parameter);
+  }
+}
+
+QString CurveSI::setXError(QString& command) {
+  QString parameter = getArg(command);
+
+  VectorPtr v = kst_cast<Vector>(curve->store()->retrieveObject(parameter));
+  if (v) {
+    curve->setXError(v);
+    return "Done";
+  } else {
+    return QString("Vector %1 not found").arg(parameter);
+  }
+}
+
+QString CurveSI::setYError(QString& command) {
+  QString parameter = getArg(command);
+
+  VectorPtr v = kst_cast<Vector>(curve->store()->retrieveObject(parameter));
+  if (v) {
+    curve->setYError(v);
+    return "Done";
+  } else {
+    return QString("Vector %1 not found").arg(parameter);
+  }
+}
+
+QString CurveSI::setXMinusError(QString& command) {
+  QString parameter = getArg(command);
+
+  VectorPtr v = kst_cast<Vector>(curve->store()->retrieveObject(parameter));
+  if (v) {
+    curve->setXMinusError(v);
+    return "Done";
+  } else {
+    return QString("Vector %1 not found").arg(parameter);
+  }
+
+}
+
+QString CurveSI::setYMinusError(QString& command) {
+  QString parameter = getArg(command);
+
+  VectorPtr v = kst_cast<Vector>(curve->store()->retrieveObject(parameter));
+  if (v) {
+    curve->setYMinusError(v);
+    return "Done";
+  } else {
+    return QString("Vector %1 not found").arg(parameter);
+  }
+}
+
+QString CurveSI::setColor(QString& command) {
+  QString parameter = getArg(command);
+  curve->setColor(QColor(parameter));
+  return "Done";
+}
+
+QString CurveSI::setHeadColor(QString& command) {
+  QString parameter = getArg(command);
+  curve->setHeadColor(QColor(parameter));
+  return "Done";
+}
+
+QString CurveSI::setBarFillColor(QString& command) {
+  QString parameter = getArg(command);
+  curve->setBarFillColor(QColor(parameter));
+  return "Done";
+}
+
+QString CurveSI::setHasPoints(QString& command) {
+  QString parameter = getArg(command);
+
+  if (parameter.toLower() == "true") {
+    curve->setHasPoints(true);
+  } else {
+    curve->setHasPoints(false);
+  }
+  return "Done";
+}
+
+QString CurveSI::setHasLines(QString& command) {
+  QString parameter = getArg(command);
+
+  if (parameter.toLower() == "true") {
+    curve->setHasLines(true);
+  } else {
+    curve->setHasLines(false);
+  }
+  return "Done";
+}
+
+QString CurveSI::setHasBars(QString& command) {
+  QString parameter = getArg(command);
+
+  if (parameter.toLower() == "true") {
+    curve->setHasBars(true);
+  } else {
+    curve->setHasBars(false);
+  }
+  return "Done";
+}
+
+QString CurveSI::setHasHead(QString& command) {
+  QString parameter = getArg(command);
+
+  if (parameter.toLower() == "true") {
+    curve->setHasHead(true);
+  } else {
+    curve->setHasHead(false);
+  }
+  return "Done";
+}
+
+QString CurveSI::setLineWidth(QString& command) {
+  QString parameter = getArg(command);
+  int x = parameter.toInt();
+
+  if (x<0) x = 0;
+  if (x>100) x = 100;
+
+  curve->setLineWidth(x);
+  return "Done";
+}
+
+QString CurveSI::setPointSize(QString& command) {
+  QString parameter = getArg(command);
+  int x = parameter.toInt();
+
+  if (x<0) x = 0;
+  if (x>100) x = 100;
+
+  curve->setPointSize(x);
+  return "Done";
+}
+
+
+}
diff --git a/src/libkstmath/relationscriptinterface.h b/src/libkstmath/relationscriptinterface.h
@@ -0,0 +1,67 @@
+/***************************************************************************
+ *                                                                         *
+ *   copyright : (C) 2014 Barth Netterfield                                *
+ *                   netterfield@astro.utoronto.ca                         *
+ *                                                                         *
+ *   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.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#ifndef RELATIONSCRIPTINTERFACE_H
+#define RELATIONSCRIPTINTERFACE_H
+
+#include <QString>
+
+#include "scriptinterface.h"
+#include "curve.h"
+
+namespace Kst {
+
+class CurveSI;
+typedef QString (CurveSI::*CurveInterfaceMemberFn)(QString& command);
+
+class KSTMATH_EXPORT CurveSI : public ScriptInterface
+{
+    Q_OBJECT
+  public:
+    explicit CurveSI(CurvePtr it);
+    QString doCommand(QString);
+    bool isValid();
+    QByteArray endEditUpdate();
+
+    static ScriptInterface* newCurve(ObjectStore *store);
+
+  protected:
+    QString noSuchFn(QString&) {return ""; }
+
+  private:
+    CurvePtr curve;
+
+    QMap<QString,CurveInterfaceMemberFn> _fnMap;
+
+    QString setXVector(QString& command);
+    QString setYVector(QString& command);
+    QString setXError(QString& command);
+    QString setYError(QString& command);
+    QString setXMinusError(QString& command);
+    QString setYMinusError(QString& command);
+
+    QString setColor(QString& command);
+    QString setHeadColor(QString& command);
+    QString setBarFillColor(QString& command);
+    QString setHasPoints(QString& command);
+    QString setHasLines(QString& command);
+    QString setHasBars(QString& command);
+    QString setHasHead(QString& command);
+
+    QString setLineWidth(QString& command);
+    QString setPointSize(QString& command);
+
+};
+
+}
+
+#endif // RELATIONSCRIPTINTERFACE_H