QPainterPath BezierCurve::toPath(qreal t1, qreal t2, int samplePoints) const
{
Q_ASSERT(t1 >= 0);
Q_ASSERT(t1 <= 1);
Q_ASSERT(t2 >= 0);
Q_ASSERT(t2 <= 1);
QPainterPath path;
path.moveTo(pointAtPercent(t1));
const qreal tau = (t2 - t1) / samplePoints;
for (int i = 1; i <= samplePoints; ++i) {
path.lineTo(pointAtPercent(t1 + i * tau));
}
return path;
}
QPainterPath BezierCurve::toPath(int samplePoints) const
{
QPainterPath path;
path.moveTo(m_p1);
for (int i = 1; i <= samplePoints; ++i) {
path.lineTo(pointAtPercent(static_cast<qreal>(i) / samplePoints));
}
return path;
}
qreal BezierCurve::intersect(const QPainterPath & path)
{
const int samplePoints = 50;
const qreal tau = 1.0 / samplePoints;
for (int a = 0; a < samplePoints; ++a) {
QLineF line1(pointAtPercent(a * tau),
pointAtPercent((a + 1) * tau));
for (int b = 0; b < samplePoints; ++b) {
QLineF line2(path.pointAtPercent(b * tau),
path.pointAtPercent((b + 1) * tau));
QPointF crossing;
if (QLineF::BoundedIntersection == line1.intersect(line2, &crossing)) {
return a * tau;
}
}
}
return 0.0;
}
QPainterPath
ConnectionPainter::
getPainterStroke(ConnectionGeometry const& geom)
{
auto cubic = cubicPath(geom);
QPointF const& source = geom.source();
QPainterPath result(source);
unsigned segments = 20;
for (auto i = 0ul; i < segments; ++i)
{
double ratio = double(i + 1) / segments;
result.lineTo(cubic.pointAtPercent(ratio));
}
QPainterPathStroker stroker; stroker.setWidth(10.0);
return stroker.createStroke(result);
}
