diff options
Diffstat (limited to 'src/declarative/util/qdeclarativetimeline.cpp')
| -rw-r--r-- | src/declarative/util/qdeclarativetimeline.cpp | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/src/declarative/util/qdeclarativetimeline.cpp b/src/declarative/util/qdeclarativetimeline.cpp index 656c62b..291b2f3 100644 --- a/src/declarative/util/qdeclarativetimeline.cpp +++ b/src/declarative/util/qdeclarativetimeline.cpp @@ -387,7 +387,10 @@ void QDeclarativeTimeLine::set(QDeclarativeTimeLineValue &timeLineValue, qreal v */ int QDeclarativeTimeLine::accel(QDeclarativeTimeLineValue &timeLineValue, qreal velocity, qreal acceleration) { - if ((velocity > 0.0f) == (acceleration > 0.0f)) + if (acceleration == 0.0f) + return -1; + + if ((velocity > 0.0f) == (acceleration > 0.0f)) acceleration = acceleration * -1.0f; int time = static_cast<int>(-1000 * velocity / acceleration); @@ -410,13 +413,16 @@ int QDeclarativeTimeLine::accel(QDeclarativeTimeLineValue &timeLineValue, qreal */ int QDeclarativeTimeLine::accel(QDeclarativeTimeLineValue &timeLineValue, qreal velocity, qreal acceleration, qreal maxDistance) { - Q_ASSERT(acceleration >= 0.0f && maxDistance >= 0.0f); + if (maxDistance == 0.0f || acceleration == 0.0f) + return -1; + + Q_ASSERT(acceleration > 0.0f && maxDistance > 0.0f); qreal maxAccel = (velocity * velocity) / (2.0f * maxDistance); if (maxAccel > acceleration) acceleration = maxAccel; - if ((velocity > 0.0f) == (acceleration > 0.0f)) + if ((velocity > 0.0f) == (acceleration > 0.0f)) acceleration = acceleration * -1.0f; int time = static_cast<int>(-1000 * velocity / acceleration); @@ -438,6 +444,7 @@ int QDeclarativeTimeLine::accelDistance(QDeclarativeTimeLineValue &timeLineValue { if (distance == 0.0f || velocity == 0.0f) return -1; + Q_ASSERT((distance >= 0.0f) == (velocity >= 0.0f)); int time = static_cast<int>(1000 * (2.0f * distance) / velocity); |