began node work

nodes/node.h

@@ -0,0 +1,31 @@
+#ifndef NODE_H
+#define NODE_H
+
+#include <QObject>
+#include <QVector>
+
+class NodeInput {
+public:
+  NodeInput();
+
+private:
+  QString name_;
+
+};
+
+class Node : public QObject
+{
+  Q_OBJECT
+public:
+  Node();
+
+private:
+  int max_inputs_;
+  QVector<Node*> inputs_;
+
+  int max_outputs_;
+  QVector<Node*> outputs_;
+
+};
+
+#endif // NODE_H