1 files changed, 36 insertions, 0 deletions
diff --git a/projectionhistory.h b/projectionhistory.h
new file mode 100644
index 0000000..28a9b4b
--- /dev/null
+++ b/projectionhistory.h
@@ -0,0 +1,36 @@
+#ifndef PROJECTIONHISTORY_H
+#define PROJECTIONHISTORY_H
+
+#include <QObject>
+
+#include <armadillo>
+
+class ProjectionHistory
+    : public QObject
+{
+    Q_OBJECT
+public:
+    explicit ProjectionHistory(QObject *parent = 0);
+
+    const arma::mat &Y() const     { return m_Y; }
+    const arma::mat &first() const { return m_firstY; }
+    const arma::mat &prev() const  { return m_prevY; }
+
+    bool hasFirst() const { return m_hasFirst; }
+    bool hasPrev() const  { return m_hasPrev; }
+
+    void undo();
+    void undoAll();
+
+signals:
+    void historyChanged(const arma::mat &currentY) const;
+
+public slots:
+    void addMap(const arma::mat &Y);
+
+private:
+    arma::mat m_Y, m_firstY, m_prevY;
+    bool m_hasFirst, m_hasPrev;
+};
+
+#endif // PROJECTIONHISTORY_H