int Plot::closestCurve(int xpos, int ypos, int &dist, int &point)
{
QwtScaleMap map[QwtPlot::axisCnt];
for ( int axis = 0; axis < QwtPlot::axisCnt; axis++ )
map[axis] = canvasMap(axis);
double dmin = 1.0e10;
int key = -1;
for (QMapIterator<int, QwtPlotCurve *> it = d_curves.begin(); it != d_curves.end(); ++it )
{
QwtPlotCurve *c = (QwtPlotCurve *)it.data();
if (!c)
continue;
for (int i=0; i<c->dataSize(); i++)
{
double cx = map[c->xAxis()].xTransform(c->x(i)) - double(xpos);
double cy = map[c->yAxis()].xTransform(c->y(i)) - double(ypos);
double f = qwtSqr(cx) + qwtSqr(cy);
if (f < dmin)
{
dmin = f;
key = it.key();
point = i;
}
}
}
dist = int(sqrt(dmin));
return key;
}
/*!
Find the closest curve point for a specific position
\param pos Position, where to look for the closest curve point
\param dist If dist != NULL, closestPoint() returns the distance between
the position and the closest curve point
\return Index of the closest curve point, or -1 if none can be found
( f.e when the curve has no points )
\note closestPoint() implements a dumb algorithm, that iterates
over all points
*/
int QwtPlotCurve::closestPoint( const QPoint &pos, double *dist ) const
{
const size_t numSamples = dataSize();
if ( plot() == NULL || numSamples <= 0 )
return -1;
const QwtSeriesData<QPointF> *series = data();
const QwtScaleMap xMap = plot()->canvasMap( xAxis() );
const QwtScaleMap yMap = plot()->canvasMap( yAxis() );
int index = -1;
double dmin = 1.0e10;
for ( uint i = 0; i < numSamples; i++ )
{
const QPointF sample = series->sample( i );
const double cx = xMap.transform( sample.x() ) - pos.x();
const double cy = yMap.transform( sample.y() ) - pos.y();
const double f = qwtSqr( cx ) + qwtSqr( cy );
if ( f < dmin )
{
index = i;
dmin = f;
}
}
if ( dist )
*dist = qSqrt( dmin );
return index;
}
QList<QwtDoublePoint> QwtCircleClipper::cuttingPoints(
Edge edge, const QwtDoublePoint &pos, double radius) const
{
QList<QwtDoublePoint> points;
if ( edge == Left || edge == Right )
{
const double x = (edge == Left) ? left() : right();
if ( qwtAbs(pos.x() - x) < radius )
{
const double off = ::sqrt(qwtSqr(radius) - qwtSqr(pos.x() - x));
const double y1 = pos.y() + off;
if ( y1 >= top() && y1 <= bottom() )
points += QwtDoublePoint(x, y1);
const double y2 = pos.y() - off;
if ( y2 >= top() && y2 <= bottom() )
points += QwtDoublePoint(x, y2);
}
}
else
{
const double y = (edge == Top) ? top() : bottom();
if ( qwtAbs(pos.y() - y) < radius )
{
const double off = ::sqrt(qwtSqr(radius) - qwtSqr(pos.y() - y));
const double x1 = pos.x() + off;
if ( x1 >= left() && x1 <= right() )
points += QwtDoublePoint(x1, y);
const double x2 = pos.x() - off;
if ( x2 >= left() && x2 <= right() )
points += QwtDoublePoint(x2, y);
}
}
return points;
}
/*!
Find the closest curve point for a specific position
\param pos Position, where to look for the closest curve point
\param dist If dist != NULL, closestPoint() returns the distance between
the position and the clostest curve point
\return Index of the closest curve point, or -1 if none can be found
( f.e when the curve has no points )
\note closestPoint() implements a dumb algorithm, that iterates
over all points
*/
int QwtPlotCurve::closestPoint(const QPoint &pos, double *dist) const
{
if ( plot() == NULL || dataSize() <= 0 )
return -1;
const QwtScaleMap xMap = plot()->canvasMap(xAxis());
const QwtScaleMap yMap = plot()->canvasMap(yAxis());
int index = -1;
double dmin = 1.0e10;
for (int i=0; i < dataSize(); i++)
{
const double cx = xMap.xTransform(x(i)) - pos.x();
const double cy = yMap.xTransform(y(i)) - pos.y();
const double f = qwtSqr(cx) + qwtSqr(cy);
if (f < dmin)
{
index = i;
dmin = f;
}
}
if ( dist )
*dist = sqrt(dmin);
return index;
}
/*!
\brief Set the scrolling mode and direction
Called by QwtAbstractSlider
\param pos Point in question
\param scrollMode Scrolling mode
\param direction Direction
*/
void QwtKnob::getScrollMode( const QPoint &pos,
QwtAbstractSlider::ScrollMode &scrollMode, int &direction ) const
{
const double r = 0.5 * d_data->knobRect.width();
const double dx = d_data->knobRect.x() + r - pos.x();
const double dy = d_data->knobRect.y() + r - pos.y();
if ( qwtSqr( dx ) + qwtSqr( dy ) <= qwtSqr( r ) )
{
// point is inside the knob
scrollMode = QwtAbstractSlider::ScrMouse;
direction = 0;
}
else // point lies outside
{
scrollMode = QwtAbstractSlider::ScrTimer;
double arc = qAtan2( double( -dx ), double( dy ) ) * 180.0 / M_PI;
if ( arc < d_data->angle )
direction = -1;
else if ( arc > d_data->angle )
direction = 1;
else
direction = 0;
}
}
QPolygonF QwtSplineCurveFitter::fitParametric( const QPolygonF &points ) const
{
int i;
const int size = points.size();
QPolygonF fittedPoints( d_data->splineSize );
QPolygonF splinePointsX( size );
QPolygonF splinePointsY( size );
const QPointF *p = points.data();
QPointF *spX = splinePointsX.data();
QPointF *spY = splinePointsY.data();
double param = 0.0;
for ( i = 0; i < size; i++ )
{
const double x = p[i].x();
const double y = p[i].y();
if ( i > 0 )
{
const double delta = qSqrt( qwtSqr( x - spX[i-1].y() )
+ qwtSqr( y - spY[i-1].y() ) );
param += qMax( delta, 1.0 );
}
spX[i].setX( param );
spX[i].setY( x );
spY[i].setX( param );
spY[i].setY( y );
}
d_data->spline.setPoints( splinePointsX );
if ( !d_data->spline.isValid() )
return points;
const double deltaX =
splinePointsX[size - 1].x() / ( d_data->splineSize - 1 );
for ( i = 0; i < d_data->splineSize; i++ )
{
const double dtmp = i * deltaX;
fittedPoints[i].setX( qRound( d_data->spline.value( dtmp ) ) );
}
d_data->spline.setPoints( splinePointsY );
if ( !d_data->spline.isValid() )
return points;
const double deltaY =
splinePointsY[size - 1].x() / ( d_data->splineSize - 1 );
for ( i = 0; i < d_data->splineSize; i++ )
{
const double dtmp = i * deltaY;
fittedPoints[i].setY( qRound( d_data->spline.value( dtmp ) ) );
}
return fittedPoints;
}
/**
* Returns the index of the closest curve to a point on the canvas.
* Also returns index of the nearest data point on that curve.
* @param xpos :: x coordinate of a point on the canvas in pixels.
* @param ypos :: y coordinate of a point on the canvas in pixels.
* @param dist :: ?
* @param point :: Output index of the nearest data point to the point with coordinates (xpos,ypos)
*/
int Plot::closestCurve(int xpos, int ypos, int &dist, int &point)
{
QwtScaleMap map[QwtPlot::axisCnt];
for ( int axis = 0; axis < QwtPlot::axisCnt; axis++ )
map[axis] = canvasMap(axis);
double dmin = std::numeric_limits<double>::max();
int key = -1;
for (QMap<int, QwtPlotItem *>::iterator iter = d_curves.begin(); iter != d_curves.end(); ++iter )
{
QwtPlotItem *item = (QwtPlotItem *)iter.data();
if (!item)
continue;
if(item->rtti() != QwtPlotItem::Rtti_PlotSpectrogram)
{
PlotCurve *c = (PlotCurve *)item;
DataCurve *dc = dynamic_cast<DataCurve *>(item);
if (dc)
{
if (c->type() != Graph::Function && dc->hasLabels() &&
dc->selectedLabels(QPoint(xpos, ypos))){
dist = 0;
return iter.key();
} else
dc->setLabelsSelected(false);
}
for (int i=0; i<c->dataSize(); i++)
{
double cx = map[c->xAxis()].xTransform(c->x(i)) - double(xpos);
double cy = map[c->yAxis()].xTransform(c->y(i)) - double(ypos);
double f = qwtSqr(cx) + qwtSqr(cy);
if (f < dmin && c->type() != Graph::ErrorBars)
{
dmin = f;
key = iter.key();
point = i;
}
}
}
}
dist = static_cast<int>(sqrt(dmin));
return key;
}
void AmpFrame::timerEvent( QTimerEvent * )
{
static double phs = 0;
//
// This amplifier generates its own input signal...
//
const double sig_bass = ( 1.0 + 0.1 * d_knbBass->value() )
* qFastSin( 13.0 * phs );
const double sig_mid_l = qFastSin( 17.0 * phs );
const double sig_mid_r = qFastCos( 17.5 * phs );
const double sig_trbl_l = 0.5 * ( 1.0 + 0.1 * d_knbTreble->value() )
* qFastSin( 35.0 * phs );
const double sig_trbl_r = 0.5 * ( 1.0 + 0.1 * d_knbTreble->value() )
* qFastSin( 34.0 * phs );
double sig_l = 0.05 * d_master * d_knbVolume->value()
* qwtSqr( sig_bass + sig_mid_l + sig_trbl_l );
double sig_r = 0.05 * d_master * d_knbVolume->value()
* qwtSqr( sig_bass + sig_mid_r + sig_trbl_r );
double balance = 0.1 * d_knbBalance->value();
if ( balance > 0 )
sig_l *= ( 1.0 - balance );
else
sig_r *= ( 1.0 + balance );
if ( sig_l > 0.01 )
sig_l = 20.0 * log10( sig_l );
else
sig_l = -40.0;
if ( sig_r > 0.01 )
sig_r = 20.0 * log10( sig_r );
else
sig_r = - 40.0;
d_thmLeft->setValue( sig_l );
d_thmRight->setValue( sig_r );
phs += M_PI / 100;
if ( phs > M_PI )
phs = 0;
}
/*!
\brief Find the marker which is closest to a given point.
\param xpos
\param ypos coordinates of a point in the plotting region
\retval dist Distance in points between the marker and the specified point.
\return Key of the closest marker or 0 if no marker was found
*/
long QwtPlot::closestMarker(int xpos, int ypos, int &dist) const
{
QwtDiMap map[axisCnt];
for ( int axis = 0; axis < axisCnt; axis++ )
map[axis] = canvasMap(axis);
long rv = 0;
double dmin = 1.0e10;
QwtPlotMarkerIterator itm = markerIterator();
for (QwtPlotMarker *m = itm.toFirst(); m != 0; m = ++itm )
{
double cx = map[m->xAxis()].xTransform(m->xValue());
double cy = map[m->yAxis()].xTransform(m->yValue());
if (m->lineStyle() == QwtMarker::HLine)
{
if (m->symbol().style() == QwtSymbol::None)
cx = double(xpos);
}
else if (m->lineStyle() == QwtMarker::VLine)
{
if (m->symbol().style() == QwtSymbol::None)
cy = double(ypos);
}
double f = qwtSqr(cx - double(xpos)) + qwtSqr(cy - double(ypos));
if (f < dmin)
{
dmin = f;
rv = itm.currentKey();
}
}
dist = int(sqrt(dmin));
return rv;
}
void TunerFrame::adjustFreq( double frq )
{
const double factor = 13.0 / ( 108 - 87.5 );
const double x = ( frq - 87.5 ) * factor;
const double field = qwtSqr( qFastSin( x ) * qFastCos( 4.0 * x ) );
d_thermoTune->setValue( field );
if ( d_sliderFrequency->value() != frq )
d_sliderFrequency->setValue( frq );
if ( d_wheelFrequency->value() != frq )
d_wheelFrequency->setValue( frq );
Q_EMIT fieldChanged( field );
}
void TunerFrame::adjustFreq(double frq)
{
const double factor = 13.0 / (108 - 87.5);
const double x = (frq - 87.5) * factor;
const double field = qwtSqr(sin(x) * cos(4.0 * x));
d_thmTune->setValue(field);
if (d_sldFreq->value() != frq)
d_sldFreq->setValue(frq);
if (d_whlFreq->value() != frq)
d_whlFreq->setValue(frq);
emit fieldChanged(field);
}
void CanvasPicker::select( const QPoint &pos, Qt::KeyboardModifiers modifiers )
{
m_selectionPoint = pos;
m_previousPoint = pos;
double minDistanceMarkers = 10e10;
double minDistanceKnots = 10e10;
MarkerItem* markerWithMinDistance = 0;
KnotItem* knotWithMinDistance = 0;
int selectionType = -1;
PlotWidget* plotWidget = dynamic_cast<PlotWidget*>( plot() );
const QwtScaleMap xMap = plot()->canvasMap( QwtPlot::xBottom );
const QwtScaleMap yMap = plot()->canvasMap( QwtPlot::yLeft );
const QwtPlotItemList& itemList = plot()->itemList();
for ( QwtPlotItemIterator it = itemList.begin(); it != itemList.end(); ++it )
{
if ( ( *it )->rtti() == Globals::Rtti_PlotMarker )
{
MarkerItem* marker = static_cast<MarkerItem*>( *it );
const double deltaX = xMap.transform( marker->xValue() ) - pos.x();
const double deltaY = yMap.transform( marker->yValue() ) - pos.y();
const double distance = qSqrt( qwtSqr( deltaX ) + qwtSqr( deltaY ) );
if ( distance < minDistanceMarkers )
{
minDistanceMarkers = distance;
markerWithMinDistance = marker;
}
}
else if ( ( *it )->rtti() == Globals::Rtti_PlotKnot )
{
KnotItem* knot = static_cast<KnotItem*>( *it );
const double distance = qAbs( xMap.transform( knot->coordinate() ) - pos.x() );
if( distance < minDistanceKnots )
{
minDistanceKnots = distance;
knotWithMinDistance = knot;
}
}
}
// Give a priority to the markers
if( minDistanceMarkers < Globals::SELECTION_PIXEL_TOLERANCE && markerWithMinDistance != 0 )
{
m_itemToPick = markerWithMinDistance;
selectionType = Globals::Rtti_PlotMarker;
}
else if( minDistanceKnots < Globals::SELECTION_PIXEL_TOLERANCE && knotWithMinDistance != 0 )
{
m_itemToPick = knotWithMinDistance;
selectionType = Globals::Rtti_PlotKnot;
}
if( selectionType == -1 )
{
emit picked( modifiers, 0 );
return;
}
QList<QwtPlotItem*>& listOfSelectedItems = plotWidget->listOfSelectedItems( selectionType );
if( listOfSelectedItems.count() == 0 )
{
// Select and allow the user to drag and drop.
emit picked( modifiers, m_itemToPick );
m_typeOfItemsToDrag = selectionType;
m_dragAndDropInProgress = true;
m_itemToPick = 0;
}
else
{
if( listOfSelectedItems.contains( m_itemToPick ) )
{
// We don't know yet whether the user wants to do a selection or a drag and drop operation.
// The picking operation will be detected in CanvasPicker::release().
m_typeOfItemsToDrag = selectionType;
m_dragAndDropInProgress = true;
}
else
{
emit picked( modifiers, m_itemToPick );
m_itemToPick = 0;
if( listOfSelectedItems.count() == 1 )
{
m_typeOfItemsToDrag = selectionType;
m_dragAndDropInProgress = true;
}
}
}
}
/*!
\brief Draw a spline
\param painter Painter
\param xMap x map
\param yMap y map
\sa QwtCurve::draw, QwtCurve::drawCurve, QwtCurve::drawDots,
QwtCurve::drawLines, QwtCurve::drawSteps, QwtCurve::drawSticks
*/
void QwtCurve::drawSpline(QPainter *painter,
const QwtDiMap &xMap, const QwtDiMap &yMap)
{
register int i;
int size = dataSize();
double *txval = new double[size];
double *tyval = new double[size];
if ( !txval || !tyval )
{
if (txval) delete[] txval;
if (tyval) delete[] tyval;
return;
}
QPointArray polyline(d_splineSize);
//
// Transform x and y values to window coordinates
// to avoid a distinction between linear and
// logarithmic scales.
//
for (i=0;i<size;i++)
{
txval[i] = xMap.xTransform(x(i));
tyval[i] = yMap.xTransform(y(i));
}
int stype;
if (! (d_options & (Yfx|Xfy|Parametric)))
{
if (qwtChkMono(txval, size))
{
stype = Yfx;
}
else
{
if(qwtChkMono(tyval, size))
{
stype = Xfy;
}
else
{
stype = Parametric;
if ( (d_options & Periodic) ||
( (x(0) == x(size-1))
&& (y(0) == y(size-1))))
{
stype |= Periodic;
}
}
}
}
else
{
stype = d_options;
}
if (stype & Parametric)
{
double *param = new double[size];
if (param)
{
//
// setup parameter vector
//
param[0] = 0.0;
for (i=1; i<size; i++)
{
double delta = sqrt( qwtSqr(txval[i] - txval[i-1])
+ qwtSqr( tyval[i] - tyval[i-1]));
param[i] = param[i-1] + qwtMax(delta, 1.0);
}
//
// setup splines
int rc = d_spx.recalc(param, txval, size, stype & Periodic);
if (!rc)
rc = d_spy.recalc(param, tyval, size, stype & Periodic);
if (rc)
{
drawLines(painter, xMap, yMap, 0, size - 1);
}
else
{
// fill point array
double delta = param[size - 1] / double(d_splineSize-1);
for (i=0;i<d_splineSize;i++)
{
double dtmp = delta * double(i);
polyline.setPoint(i, int(floor (d_spx.value(dtmp) + 0.5)),
int(floor (d_spy.value(dtmp) + 0.5)));
}
}
delete[] param;
}
}
else if (stype & Xfy)
{
if (tyval[size-1] < tyval[0])
{
qwtTwistArray(txval, size);
qwtTwistArray(tyval, size);
}
// 1. Calculate spline coefficients
int rc = d_spx.recalc(tyval, txval, size, stype & Periodic);
if (rc) // an error occurred
{
drawLines(painter, xMap, yMap, 0, size - 1);
}
else // Spline OK
{
double ymin = qwtGetMin(tyval, size);
double ymax = qwtGetMax(tyval, size);
double delta = (ymax - ymin) / double(d_splineSize - 1);
for (i=0;i<d_splineSize;i++)
{
double dtmp = ymin + delta * double(i);
polyline.setPoint(i, int(floor(d_spx.value(dtmp) + 0.5)),
int(floor(dtmp + 0.5)));
}
}
}
else
{
if (txval[size-1] < txval[0])
{
qwtTwistArray(tyval, size);
qwtTwistArray(txval, size);
}
// 1. Calculate spline coefficients
int rc = d_spy.recalc(txval, tyval, size, stype & Periodic);
if (rc) // error
{
drawLines(painter, xMap, yMap, 0, size - 1);
}
else // Spline OK
{
double xmin = qwtGetMin(txval, size);
double xmax = qwtGetMax(txval, size);
double delta = (xmax - xmin) / double(d_splineSize - 1);
for (i=0;i<d_splineSize;i++)
{
double dtmp = xmin + delta * double(i);
polyline.setPoint(i, int(floor (dtmp + 0.5)),
int(floor(d_spy.value(dtmp) + 0.5)));
}
}
}
delete[] txval;
delete[] tyval;
QwtPainter::drawPolyline(painter, polyline);
if ( painter->brush().style() != Qt::NoBrush )
{
closePolyline(xMap, yMap, polyline);
painter->setPen(QPen(Qt::NoPen));
QwtPainter::drawPolygon(painter, polyline);
}
}
/*!
\brief Render a sub-rectangle of an image
renderTile() is called by renderImage() to render different parts
of the image by concurrent threads.
\param azimuthMap Maps azimuth values to values related to 0.0, M_2PI
\param radialMap Maps radius values into painter coordinates.
\param pole Position of the pole in painter coordinates
\param imagePos Top/left position of the image in painter coordinates
\param tile Sub-rectangle of the tile in painter coordinates
\param image Image to be rendered
\sa setRenderThreadCount()
\note renderTile needs to be reentrant
*/
void QwtPolarSpectrogram::renderTile(
const QwtScaleMap &azimuthMap, const QwtScaleMap &radialMap,
const QPointF &pole, const QPoint &imagePos,
const QRect &tile, QImage *image ) const
{
const QwtInterval intensityRange = d_data->data->interval( Qt::ZAxis );
if ( !intensityRange.isValid() )
return;
const bool doFastAtan = testPaintAttribute( ApproximatedAtan );
const int y0 = imagePos.y();
const int y1 = tile.top();
const int y2 = tile.bottom();
const int x0 = imagePos.x();
const int x1 = tile.left();
const int x2 = tile.right();
if ( d_data->colorMap->format() == QwtColorMap::RGB )
{
for ( int y = y1; y <= y2; y++ )
{
const double dy = pole.y() - y;
const double dy2 = qwtSqr( dy );
QRgb *line = reinterpret_cast<QRgb *>( image->scanLine( y - y0 ) );
line += x1 - x0;
for ( int x = x1; x <= x2; x++ )
{
const double dx = x - pole.x();
double a = doFastAtan ? qwtFastAtan2( dy, dx ) : qAtan2( dy, dx );
if ( a < 0.0 )
a += 2 * M_PI;
if ( a < azimuthMap.p1() )
a += 2 * M_PI;
const double r = qSqrt( qwtSqr( dx ) + dy2 );
const double azimuth = azimuthMap.invTransform( a );
const double radius = radialMap.invTransform( r );
const double value = d_data->data->value( azimuth, radius );
*line++ = d_data->colorMap->rgb( intensityRange, value );
}
}
}
else if ( d_data->colorMap->format() == QwtColorMap::Indexed )
{
for ( int y = y1; y <= y2; y++ )
{
const double dy = pole.y() - y;
const double dy2 = qwtSqr( dy );
unsigned char *line = image->scanLine( y - y0 );
line += x1 - x0;
for ( int x = x1; x <= x2; x++ )
{
const double dx = x - pole.x();
double a = doFastAtan ? qwtFastAtan2( dy, dx ) : qAtan2( dy, dx );
if ( a < 0.0 )
a += 2 * M_PI;
if ( a < azimuthMap.p1() )
a += 2 * M_PI;
const double r = qSqrt( qwtSqr( dx ) + dy2 );
const double azimuth = azimuthMap.invTransform( a );
const double radius = radialMap.invTransform( r );
const double value = d_data->data->value( azimuth, radius );
*line++ = d_data->colorMap->colorIndex( intensityRange, value );
}
}
}
}
/*!
Convert and assign values from a point in Cartesian coordinates
\param p Point in Cartesian coordinates
*/
void QwtPointPolar::setPoint( const QPointF &p )
{
d_radius = qSqrt( qwtSqr( p.x() ) + qwtSqr( p.y() ) );
d_azimuth = qAtan2( p.y(), p.x() );
}
