Add velocity estimate

The per-touch velocity is useful in many contexts. This patch
adds a simple estimator of the velocity, which also smooths out
position jumps caused by course-grained event updates.

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>

1 files changed, 2 insertions, 0 deletions

diff --git a/tools/common-defs.h b/tools/common-defs.h
index 0e08bc5..e435f72 100644
--- a/tools/common-defs.h
+++ b/tools/common-defs.h
@@ -72,6 +72,8 @@ static void report_frame(const struct utouch_frame *frame)
                 fprintf(stderr, "  angle:        %f\n", t->orientation);
                 fprintf(stderr, "  pressure:     %f\n", t->pressure);
                 fprintf(stderr, "  distance:     %f\n", t->distance);
+                fprintf(stderr, "  vx:           %f\n", t->vx);
+                fprintf(stderr, "  vy:           %f\n", t->vy);
         }
 
         fprintf(stderr, "sync %d %ld %d %d %d\n",