Added ProjectionHistory object for history tracking.

1 files changed, 45 insertions, 0 deletions

diff --git a/projectionhistory.cpp b/projectionhistory.cpp
new file mode 100644
index 0000000..b8ffb57
--- /dev/null
+++ b/projectionhistory.cpp
@@ -0,0 +1,45 @@
+#include "projectionhistory.h"
+
+ProjectionHistory::ProjectionHistory(QObject *parent)
+    : QObject(parent)
+    , m_hasFirst(false)
+    , m_hasPrev(false)
+{
+}
+
+inline void ProjectionHistory::undo()
+{
+    if (m_hasPrev) {
+        m_hasPrev = false;
+        m_Y = m_prevY;
+
+        emit historyChanged(m_Y);
+    }
+}
+
+inline void ProjectionHistory::undoAll()
+{
+    if (m_hasFirst) {
+        m_hasPrev = false;
+        m_Y = m_firstY;
+
+        emit historyChanged(m_Y);
+    }
+}
+
+void ProjectionHistory::addMap(const arma::mat &Y)
+{
+    if (m_hasFirst) {
+        m_hasPrev = true;
+        m_prevY = m_Y;
+    }
+
+    m_Y = Y;
+
+    if (!m_hasFirst) {
+        m_hasFirst = true;
+        m_firstY = m_Y;
+    }
+
+    emit historyChanged(m_Y);
+}