Scatterplot & BarChart: initial brushing mechanism.

* Both components now support brushing (support in Scatterplot for
  activating a brush is still incomplete, though it can be brushed
  on by other components)
* Added a handler for linking the brushing between components
* Added crosshair geometry handler to geometry lib
* Fixed issue #15

1 files changed, 25 insertions, 0 deletions

diff --git a/brushinghandler.h b/brushinghandler.h
new file mode 100644
index 0000000..ebee75a
--- /dev/null
+++ b/brushinghandler.h
@@ -0,0 +1,25 @@
+#ifndef BRUSHINGHANDLER_H
+#define BRUSHINGHANDLER_H
+
+#include <QObject>
+
+class BrushingHandler
+    : public QObject
+{
+    Q_OBJECT
+public:
+    BrushingHandler();
+
+    void clearBrush();
+
+signals:
+    void itemBrushed(int item) const;
+
+public slots:
+    void brushItem(int item);
+
+private:
+    int m_brushedItem;
+};
+
+#endif // BRUSHINGHANDLER_H