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(); } }
QPainterPath KisToolFreehandHelper::paintOpOutline(const QPointF &savedCursorPos, const KoPointerEvent *event, const KisPaintOpSettingsSP globalSettings, KisPaintOpSettings::OutlineMode mode) const { KisPaintOpSettingsSP settings = globalSettings; KisPaintInformation info = m_d->infoBuilder->hover(savedCursorPos, event); info.setCanvasRotation(m_d->canvasRotation); info.setCanvasHorizontalMirrorState( m_d->canvasMirroredH ); KisDistanceInformation distanceInfo(m_d->lastOutlinePos.pushThroughHistory(savedCursorPos), 0); if (!m_d->painterInfos.isEmpty()) { settings = m_d->resources->currentPaintOpPreset()->settings(); if (m_d->stabilizerDelayedPaintHelper.running() && m_d->stabilizerDelayedPaintHelper.hasLastPaintInformation()) { info = m_d->stabilizerDelayedPaintHelper.lastPaintInformation(); } else { info = m_d->previousPaintInformation; } /** * When LoD mode is active it may happen that the helper has * already started a stroke, but it painted noting, because * all the work is being calculated by the scaled-down LodN * stroke. So at first we try to fetch the data from the lodN * stroke ("buddy") and then check if there is at least * something has been painted with this distance information * object. */ KisDistanceInformation *buddyDistance = m_d->painterInfos.first()->buddyDragDistance(); if (buddyDistance) { /** * Tiny hack alert: here we fetch the distance information * directly from the LodN stroke. Ideally, we should * upscale its data, but here we just override it with our * local copy of the coordinates. */ distanceInfo = *buddyDistance; distanceInfo.overrideLastValues(m_d->lastOutlinePos.pushThroughHistory(savedCursorPos), 0); } else if (m_d->painterInfos.first()->dragDistance->isStarted()) { distanceInfo = *m_d->painterInfos.first()->dragDistance; } } KisPaintInformation::DistanceInformationRegistrar registrar = info.registerDistanceInformation(&distanceInfo); QPainterPath outline = settings->brushOutline(info, mode); if (m_d->resources && m_d->smoothingOptions->smoothingType() == KisSmoothingOptions::STABILIZER && m_d->smoothingOptions->useDelayDistance()) { const qreal R = m_d->smoothingOptions->delayDistance() / m_d->resources->effectiveZoom(); outline.addEllipse(info.pos(), R, R); } return outline; }