void KisToolLineHelper::addPoint(KoPointerEvent *event, const QPointF &overridePos)
{
if (!m_d->enabled) return;
KisPaintInformation pi =
m_d->infoBuilder->continueStroke(event, elapsedStrokeTime());
if (!m_d->useSensors) {
pi = KisPaintInformation(pi.pos());
}
if (!overridePos.isNull()) {
pi.setPos(overridePos);
}
if (m_d->linePoints.size() > 1) {
const QPointF startPos = m_d->linePoints.first().pos();
const QPointF endPos = pi.pos();
const qreal maxDistance = kisDistance(startPos, endPos);
const QPointF unit = (endPos - startPos) / maxDistance;
QVector<KisPaintInformation>::iterator it = m_d->linePoints.begin();
++it;
while (it != m_d->linePoints.end()) {
qreal dist = kisDistance(startPos, it->pos());
if (dist < maxDistance) {
QPointF pos = startPos + unit * dist;
it->setPos(pos);
++it;
} else {
it = m_d->linePoints.erase(it);
}
}
}
m_d->linePoints.append(pi);
}
void KisToolFreehandHelper::paint(KoPointerEvent *event)
{
KisPaintInformation info =
m_d->infoBuilder->continueStroke(event,
elapsedStrokeTime());
info.setCanvasRotation( m_d->canvasRotation );
info.setCanvasHorizontalMirrorState( m_d->canvasMirroredH );
KisUpdateTimeMonitor::instance()->reportMouseMove(info.pos());
/**
* Smooth the coordinates out using the history and the
* distance. This is a heavily modified version of an algo used in
* Gimp and described in https://bugs.kde.org/show_bug.cgi?id=281267 and
* http://www24.atwiki.jp/sigetch_2007/pages/17.html. The main
* differences are:
*
* 1) It uses 'distance' instead of 'velocity', since time
* measurements are too unstable in realworld environment
*
* 2) There is no 'Quality' parameter, since the number of samples
* is calculated automatically
*
* 3) 'Tail Aggressiveness' is used for controling the end of the
* stroke
*
* 4) The formila is a little bit different: 'Distance' parameter
* stands for $3 \Sigma$
*/
if (m_d->smoothingOptions->smoothingType() == KisSmoothingOptions::WEIGHTED_SMOOTHING
&& m_d->smoothingOptions->smoothnessDistance() > 0.0) {
{ // initialize current distance
QPointF prevPos;
if (!m_d->history.isEmpty()) {
const KisPaintInformation &prevPi = m_d->history.last();
prevPos = prevPi.pos();
} else {
prevPos = m_d->previousPaintInformation.pos();
}
qreal currentDistance = QVector2D(info.pos() - prevPos).length();
m_d->distanceHistory.append(currentDistance);
}
m_d->history.append(info);
qreal x = 0.0;
qreal y = 0.0;
if (m_d->history.size() > 3) {
const qreal sigma = m_d->effectiveSmoothnessDistance() / 3.0; // '3.0' for (3 * sigma) range
qreal gaussianWeight = 1 / (sqrt(2 * M_PI) * sigma);
qreal gaussianWeight2 = sigma * sigma;
qreal distanceSum = 0.0;
qreal scaleSum = 0.0;
qreal pressure = 0.0;
qreal baseRate = 0.0;
Q_ASSERT(m_d->history.size() == m_d->distanceHistory.size());
for (int i = m_d->history.size() - 1; i >= 0; i--) {
qreal rate = 0.0;
const KisPaintInformation nextInfo = m_d->history.at(i);
double distance = m_d->distanceHistory.at(i);
Q_ASSERT(distance >= 0.0);
qreal pressureGrad = 0.0;
if (i < m_d->history.size() - 1) {
pressureGrad = nextInfo.pressure() - m_d->history.at(i + 1).pressure();
const qreal tailAgressiveness = 40.0 * m_d->smoothingOptions->tailAggressiveness();
if (pressureGrad > 0.0 ) {
pressureGrad *= tailAgressiveness * (1.0 - nextInfo.pressure());
distance += pressureGrad * 3.0 * sigma; // (3 * sigma) --- holds > 90% of the region
}
}
if (gaussianWeight2 != 0.0) {
distanceSum += distance;
rate = gaussianWeight * exp(-distanceSum * distanceSum / (2 * gaussianWeight2));
}
if (m_d->history.size() - i == 1) {
baseRate = rate;
} else if (baseRate / rate > 100) {
break;
}
scaleSum += rate;
x += rate * nextInfo.pos().x();
y += rate * nextInfo.pos().y();
if (m_d->smoothingOptions->smoothPressure()) {
pressure += rate * nextInfo.pressure();
}
}
if (scaleSum != 0.0) {
x /= scaleSum;
y /= scaleSum;
if (m_d->smoothingOptions->smoothPressure()) {
pressure /= scaleSum;
}
}
if ((x != 0.0 && y != 0.0) || (x == info.pos().x() && y == info.pos().y())) {
info.setPos(QPointF(x, y));
if (m_d->smoothingOptions->smoothPressure()) {
info.setPressure(pressure);
}
m_d->history.last() = info;
}
}
}
if (m_d->smoothingOptions->smoothingType() == KisSmoothingOptions::SIMPLE_SMOOTHING
|| m_d->smoothingOptions->smoothingType() == KisSmoothingOptions::WEIGHTED_SMOOTHING)
{
// Now paint between the coordinates, using the bezier curve interpolation
if (!m_d->haveTangent) {
m_d->haveTangent = true;
m_d->previousTangent =
(info.pos() - m_d->previousPaintInformation.pos()) /
qMax(qreal(1.0), info.currentTime() - m_d->previousPaintInformation.currentTime());
} else {
QPointF newTangent = (info.pos() - m_d->olderPaintInformation.pos()) /
qMax(qreal(1.0), info.currentTime() - m_d->olderPaintInformation.currentTime());
paintBezierSegment(m_d->olderPaintInformation, m_d->previousPaintInformation,
m_d->previousTangent, newTangent);
m_d->previousTangent = newTangent;
}
m_d->olderPaintInformation = m_d->previousPaintInformation;
m_d->strokeTimeoutTimer.start(100);
}
else if (m_d->smoothingOptions->smoothingType() == KisSmoothingOptions::NO_SMOOTHING) {
paintLine(m_d->previousPaintInformation, info);
}
if (m_d->smoothingOptions->smoothingType() == KisSmoothingOptions::STABILIZER) {
m_d->stabilizedSampler.addEvent(info);
} else {
m_d->previousPaintInformation = info;
}
if(m_d->airbrushingTimer.isActive()) {
m_d->airbrushingTimer.start();
}
}
