Inital history graph implementation and using linear scales where applicable.

- geometry.h for geometry calculation functions
- scale.h for implementations of scales (currently only the linear scale)
- updated main_view.qml for the new HistoryGraph component
- HistoryGraph displays each subsample used as a mini scatterplot (no colors
  currently)
- Scatterplot now uses scale.h for transformations
- Code cleanup and some bug fixes

1 files changed, 14 insertions, 2 deletions

diff --git a/historygraph.h b/historygraph.h
index b854d1e..564845c 100644
--- a/historygraph.h
+++ b/historygraph.h
@@ -1,20 +1,32 @@
 #ifndef HISTORYGRAPH_H
 #define HISTORYGRAPH_H
 
-#include <armadillo>
 #include <QtQuick>
+#include <armadillo>
 
 class HistoryGraph : public QQuickItem
 {
     Q_OBJECT
 public:
     HistoryGraph(QQuickItem *parent = 0);
+    ~HistoryGraph();
 
 public slots:
-    void addHistoryItem(const int &item);
+    void addHistoryItem(const arma::mat &item);
 
 protected:
     QSGNode *updatePaintNode(QSGNode *oldNode, UpdatePaintNodeData *);
+
+private:
+    class HistoryItemNode;
+
+    QSGNode *createNodeTree();
+    void updateNodeTree(QSGNode *root);
+    void addScatterplot(QSGNode *node, const HistoryItemNode *historyItemNode, float x, float y, float w, float h);
+
+
+    HistoryItemNode *m_firstNode, *m_currentNode;
+    bool m_needsUpdate;
 };
 
 #endif // HISTORYGRAPH_H