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Advanced snapping, basics of screenshot tool

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This commit is contained in:
Jakub Melka
2020-02-28 18:56:28 +01:00
parent 46c267e537
commit 13bfbd7095
7 changed files with 212 additions and 3 deletions
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47
PdfForQtLib/sources/pdfsnapper.cpp
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@ -179,6 +179,41 @@ void PDFSnapper::buildSnapPoints(const PDFWidgetSnapshot& snapshot)
viewportSnapPoint.viewportPoint = item.pageToDeviceMatrix.map(snapPoint.point);
m_snapPoints.push_back(qMove(viewportSnapPoint));
}
// Fill line projections snap points
if (m_currentPage == item.pageIndex && m_referencePoint.has_value())
{
QPointF referencePoint = *m_referencePoint;
for (const QLineF& line : info->getLines())
{
// Project point onto line.
const qreal lineLength = line.length();
QPointF vector = referencePoint - line.p1();
QPointF tangentVector = (line.p2() - line.p1()) / lineLength;
const qreal absoluteParameter = QPointF::dotProduct(vector, tangentVector);
if (absoluteParameter >= 0 && absoluteParameter <= lineLength)
{
QPointF projectedSnapPoint = line.pointAt(absoluteParameter / lineLength);
const PDFReal tolerance = lineLength * 0.01;
const PDFReal squaredTolerance = tolerance * tolerance;
// Test, if projected snap point is not already present in snap points
auto testSamePoints = [projectedSnapPoint, squaredTolerance](const ViewportSnapPoint& testedSnapPoint)
{
return isFuzzyComparedPointsSame(projectedSnapPoint, testedSnapPoint.point, squaredTolerance);
};
if (m_snapPoints.cend() == std::find_if(m_snapPoints.cbegin(), m_snapPoints.cend(), testSamePoints))
{
ViewportSnapPoint viewportSnapPoint;
viewportSnapPoint.type = SnapType::GeneratedLineProjection;
viewportSnapPoint.point = projectedSnapPoint;
viewportSnapPoint.pageIndex = item.pageIndex;
viewportSnapPoint.viewportPoint = item.pageToDeviceMatrix.map(projectedSnapPoint);
m_snapPoints.push_back(qMove(viewportSnapPoint));
}
}
}
}
}
// Third, update snap shot position
@ -205,4 +240,16 @@ QPointF PDFSnapper::getSnappedPoint() const
return m_mousePoint;
}
void PDFSnapper::setReferencePoint(PDFInteger pageIndex, QPointF pagePoint)
{
m_currentPage = pageIndex;
m_referencePoint = pagePoint;
}
void PDFSnapper::clearReferencePoint()
{
m_currentPage = -1;
m_referencePoint = std::nullopt;
}
} // namespace pdf