diff options
Diffstat (limited to 'src/quick/util/qdeclarativepath.cpp')
| -rw-r--r-- | src/quick/util/qdeclarativepath.cpp | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/src/quick/util/qdeclarativepath.cpp b/src/quick/util/qdeclarativepath.cpp index 842b5465b7..52d0245ee0 100644 --- a/src/quick/util/qdeclarativepath.cpp +++ b/src/quick/util/qdeclarativepath.cpp @@ -513,6 +513,12 @@ void QDeclarativePath::createPointCache() const } } +void QDeclarativePath::invalidateSequentialHistory() const +{ + Q_D(const QDeclarativePath); + d->prevBez.isValid = false; +} + QPointF QDeclarativePath::sequentialPointAt(qreal p, qreal *angle) const { Q_D(const QDeclarativePath); @@ -590,7 +596,7 @@ QPointF QDeclarativePath::backwardsPointAt(const QPainterPath &path, const qreal if (pathLength <= 0 || qIsNaN(pathLength)) return path.pointAtPercent(0); - const int firstElement = 0; + const int firstElement = 1; //element 0 is always a MoveTo, which we ignore bool haveCachedBez = prevBez.isValid; int currElement = haveCachedBez ? prevBez.element : path.elementCount(); qreal bezLength = haveCachedBez ? prevBez.bezLength : 0; @@ -612,7 +618,9 @@ QPointF QDeclarativePath::backwardsPointAt(const QPainterPath &path, const qreal Q_ASSERT(!(currElement < firstElement)); Q_UNUSED(firstElement); currBez = nextBezier(path, &currElement, &bezLength, true /*reverse*/); - currLength = prevLength; + //special case for first element is to avoid floating point math + //causing an epc that never hits 0. + currLength = (currElement == firstElement) ? bezLength : prevLength; prevLength = currLength - bezLength; epc = prevLength / pathLength; } |