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, 17 insertions, 0 deletions

diff --git a/brushinghandler.cpp b/brushinghandler.cpp
new file mode 100644
index 0000000..0a8b9aa
--- /dev/null
+++ b/brushinghandler.cpp
@@ -0,0 +1,17 @@
+#include "brushinghandler.h"
+
+BrushingHandler::BrushingHandler()
+    : m_brushedItem(-1)
+{
+}
+
+void BrushingHandler::clearBrush()
+{
+    brushItem(-1);
+}
+
+void BrushingHandler::brushItem(int item)
+{
+    m_brushedItem = item;
+    emit itemBrushed(item);
+}