diff options
| -rw-r--r-- | overlay/chart.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/overlay/chart.c b/overlay/chart.c index 2a33d612..734e911f 100644 --- a/overlay/chart.c +++ b/overlay/chart.c @@ -143,7 +143,11 @@ static double value_at(struct chart *chart, int n) else if (n >= chart->current_sample) n = chart->current_sample - 1; - return chart->samples[n % chart->num_samples]; + n %= chart->num_samples; + if (n < 0) + n += chart->num_samples; + + return chart->samples[n]; } static double gradient_at(struct chart *chart, int n) |