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[WIP] GraphicsView: Add General_polygon_2 to QPainterPath converter. … #2059

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[WIP] GraphicsView: Add General_polygon_2 to QPainterPath converter. … #2059

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48 changes: 48 additions & 0 deletions GraphicsView/include/CGAL/Qt/Converter.h
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Original file line number Diff line number Diff line change
Expand Up @@ -24,9 +24,11 @@
#include <CGAL/license/GraphicsView.h>


#include <QtMath>
#include <QPointF>
#include <QLineF>
#include <QRectF>
#include <QPainterPath>
#include <QPolygonF>
#include <list>

Expand Down Expand Up @@ -183,6 +185,52 @@ class Converter {
}
}

template < typename T >
QPainterPath operator()(const typename CGAL::General_polygon_2< T > &pgn) const
{
typedef typename CGAL::General_polygon_2< T > CGAL_Polygon_2;
typedef typename CGAL_Polygon_2::Curve_const_iterator CGAL_Curve_const_iterator;
typedef typename CGAL_Polygon_2::X_monotone_curve_2 CGAL_X_monotone_curve_2;

QPainterPath result;

CGAL_Curve_const_iterator current = pgn.curves_begin();
CGAL_Curve_const_iterator end = pgn.curves_end();

result.moveTo(QPointF(CGAL::to_double(current->source().x()),
CGAL::to_double(current->source().y())));

do {
const CGAL_X_monotone_curve_2 &curve = *current;
const QPointF target = QPointF(CGAL::to_double(curve.target().x()),
CGAL::to_double(curve.target().y()));

if (curve.is_linear()) {
result.lineTo(target);
}
else if (curve.is_circular()) {
const bool isClockwise = (curve.supporting_circle().orientation() == CGAL::CLOCKWISE);
const QRectF rect = operator()(curve.supporting_circle().bbox());
const QPointF center = QPointF(CGAL::to_double(curve.supporting_circle().center().x()),
CGAL::to_double(curve.supporting_circle().center().y()));
const QPointF source = QPointF(CGAL::to_double(curve.source().x()),
CGAL::to_double(curve.source().y()));
const QPointF p1 = source - center;
const QPointF p2 = target - center;
const double asource = qAtan2(p1.y(), p1.x());
const double atarget = qAtan2(p2.y(), p2.x());
double aspan = atarget - asource;
if (aspan < -CGAL_PI || (qFuzzyCompare(aspan, -CGAL_PI) && !isClockwise))
aspan += 2.0*CGAL_PI;
else if (aspan > CGAL_PI || (qFuzzyCompare(aspan, CGAL_PI) && isClockwise))
aspan -= 2.0*CGAL_PI;
result.arcTo(rect.normalized(), qRadiansToDegrees(-asource), qRadiansToDegrees(-aspan));
}
} while (++current != end);

return result;
}

};

} // namespace Qt
Expand Down