Do not compute velocity until enough data is available

The first few ticks since a configuration change are not really
suited for velocity computation, so move the speed computation
over to the periodic sampling point.

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

1 files changed, 1 insertions, 1 deletions

diff --git a/src/grail-gestures.c b/src/grail-gestures.c
index a50ddca..4bd83b3 100644
--- a/src/grail-gestures.c
+++ b/src/grail-gestures.c
@@ -120,9 +120,9 @@ static void move_update(struct move_model *m, int i, float x, grail_time_t t)
         float dt = t - fm->sample_ms;
         fm->raw_delta = x - fm->value;
         fm->action_delta = fm->raw_delta;
-        fm->velocity = dt > EPS ? (x - fm->sample) / dt : 0;
         fm->value = x;
         if (dt > SAMPLE_MS) {
+                fm->velocity = (x - fm->sample) / dt;
                 fm->sample = x;
                 fm->sample_ms = t;
         }