Don't crash in the fingerpaint example if the touch id gets too large

Some touch devices don't recycle touch id's, so for longer sequences we could easily see
ids that become larger than the color list size. Make sure we constrain the index we use.

1 files changed, 1 insertions, 1 deletions

diff --git a/examples/multitouch/fingerpaint/scribblearea.cpp b/examples/multitouch/fingerpaint/scribblearea.cpp
index c07d982..0e828cc 100644
--- a/examples/multitouch/fingerpaint/scribblearea.cpp
+++ b/examples/multitouch/fingerpaint/scribblearea.cpp
@@ -192,7 +192,7 @@ bool ScribbleArea::event(QEvent *event)
 
                     QPainter painter(&image);
                     painter.setPen(Qt::NoPen);
-                    painter.setBrush(myPenColors.at(touchPoint.id()));
+                    painter.setBrush(myPenColors.at(touchPoint.id() % myPenColors.count()));
                     painter.drawEllipse(rect);
                     painter.end();