statistics: implement rectangle selection in scatter plot

Allow the user to select regions of the scatter plot using
a rectangular selection. When shift is pressed, do an
incremental selection.

Unfortunately, the list-selection code is so slow that this
becomes unusable for a large number of selected dives.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

1 files changed, 9 insertions, 0 deletions

diff --git a/stats/statsseries.cpp b/stats/statsseries.cpp
index 18fc0a3ff..0885f14de 100644
--- a/stats/statsseries.cpp
+++ b/stats/statsseries.cpp
@@ -20,3 +20,12 @@ QPointF StatsSeries::toScreen(QPointF p)
 void StatsSeries::divesSelected(const QVector<dive *> &)
 {
 }
+
+bool StatsSeries::supportsLassoSelection() const
+{
+	return false;
+}
+
+void StatsSeries::selectItemsInRect(const QRectF &, bool, const std::vector<dive *> &)
+{
+}