static inline Polygon qwtToPointsFiltered(
const QRectF &boundingRect,
const QwtScaleMap &xMap, const QwtScaleMap &yMap,
const QwtSeriesData<QPointF> *series, int from, int to )
{
// F.e. in scatter plots ( no connecting lines ) we
// can sort out all duplicates ( not only consecutive points )
Polygon polygon( to - from + 1 );
Point *points = polygon.data();
QwtPixelMatrix pixelMatrix( boundingRect.toAlignedRect() );
int numPoints = 0;
for ( int i = from; i <= to; i++ )
{
const QPointF sample = series->sample( i );
const int x = qwtRoundValue( xMap.transform( sample.x() ) );
const int y = qwtRoundValue( yMap.transform( sample.y() ) );
if ( pixelMatrix.testAndSetPixel( x, y, true ) == false )
{
points[ numPoints ].rx() = x;
points[ numPoints ].ry() = y;
numPoints++;
}
}
polygon.resize( numPoints );
return polygon;
}
/*!
\brief Draw symbols
\param painter Painter
\param symbol Curve symbol
\param xMap x map
\param yMap y map
\param from index of the first point to be painted
\param to index of the last point to be painted
\sa setSymbol(), draw(), drawCurve()
*/
void QwtPlotCurve::drawSymbols(QPainter *painter, const QwtSymbol &symbol,
const QwtScaleMap &xMap, const QwtScaleMap &yMap,
int from, int to) const
{
painter->setBrush(symbol.brush());
painter->setPen(QwtPainter::scaledPen(symbol.pen()));
const QwtMetricsMap &metricsMap = QwtPainter::metricsMap();
QRect rect;
rect.setSize(metricsMap.screenToLayout(symbol.size()));
if ( to > from && d_data->paintAttributes & PaintFiltered )
{
const QRect window = painter->window();
if ( window.isEmpty() )
return;
PrivateData::PixelMatrix pixelMatrix(window);
for (int i = from; i <= to; i++)
{
const QPoint pi( xMap.transform(x(i)),
yMap.transform(y(i)) );
if ( pixelMatrix.testPixel(pi) )
{
rect.moveCenter(pi);
symbol.draw(painter, rect);
}
}
}
else
{
for (int i = from; i <= to; i++)
{
const int xi = xMap.transform(x(i));
const int yi = yMap.transform(y(i));
rect.moveCenter(QPoint(xi, yi));
symbol.draw(painter, rect);
}
}
}
/*!
Draw dots
\param painter Painter
\param xMap x map
\param yMap y map
\param from index of the first point to be painted
\param to index of the last point to be painted
\sa draw(), drawCurve(), drawSticks(), drawLines(), drawSteps()
*/
void QwtPlotCurve::drawDots(QPainter *painter,
const QwtScaleMap &xMap, const QwtScaleMap &yMap,
int from, int to) const
{
const QRect window = painter->window();
if ( window.isEmpty() )
return;
const bool doFill = d_data->brush.style() != Qt::NoBrush;
QwtPolygon polyline;
if ( doFill )
polyline.resize(to - from + 1);
if ( to > from && d_data->paintAttributes & PaintFiltered )
{
if ( doFill )
{
QPoint pp( xMap.transform(x(from)), yMap.transform(y(from)) );
QwtPainter::drawPoint(painter, pp.x(), pp.y());
polyline.setPoint(0, pp);
int count = 1;
for (int i = from + 1; i <= to; i++)
{
const QPoint pi(xMap.transform(x(i)), yMap.transform(y(i)));
if ( pi != pp )
{
QwtPainter::drawPoint(painter, pi.x(), pi.y());
polyline.setPoint(count, pi);
count++;
pp = pi;
}
}
if ( int(polyline.size()) != count )
polyline.resize(count);
}
else
{
// if we don't need to fill, we can sort out
// duplicates independent from the order
PrivateData::PixelMatrix pixelMatrix(window);
for (int i = from; i <= to; i++)
{
const QPoint p( xMap.transform(x(i)),
yMap.transform(y(i)) );
if ( pixelMatrix.testPixel(p) )
QwtPainter::drawPoint(painter, p.x(), p.y());
}
}
}
else
{
for (int i = from; i <= to; i++)
{
const int xi = xMap.transform(x(i));
const int yi = yMap.transform(y(i));
QwtPainter::drawPoint(painter, xi, yi);
if ( doFill )
polyline.setPoint(i - from, xi, yi);
}
}
if ( doFill )
{
if ( d_data->paintAttributes & ClipPolygons )
polyline = QwtClipper::clipPolygon(painter->window(), polyline);
fillCurve(painter, xMap, yMap, polyline);
}
}
/*!
Draw dots
\param painter Painter
\param xMap x map
\param yMap y map
\param from index of the first point to be painted
\param to index of the last point to be painted
\sa draw(), drawCurve(), drawSticks(), drawLines(), drawSteps()
*/
void QwtPlotCurve::drawDots(QPainter *painter,
const QwtScaleMap &xMap, const QwtScaleMap &yMap,
int from, int to) const
{
const bool doFill = d_data->brush.style() != Qt::NoBrush;
QwtPolygonF polyline;
if ( doFill )
polyline.resize(to - from + 1);
if ( to > from && d_data->paintAttributes & PaintFiltered )
{
if ( doFill || d_data->canvasRect.isEmpty() )
{
QPointF pp( xMap.xTransform(x(from)), yMap.xTransform(y(from)) );
QwtPainter::drawPoint(painter, pp.x(), pp.y());
polyline[0] = pp;
int count = 1;
for (int i = from + 1; i <= to; i++)
{
const QPointF pi(xMap.xTransform(x(i)), yMap.xTransform(y(i)));
if ( pi != pp )
{
QwtPainter::drawPoint(painter, pi.x(), pi.y());
polyline[count] = pi;
count++;
pp = pi;
}
}
if ( int(polyline.size()) != count )
polyline.resize(count);
}
else
{
// if we don't need to fill, we can sort out
// duplicates independent from the order
PrivateData::PixelMatrix pixelMatrix(d_data->canvasRect);
for (int i = from; i <= to; i++)
{
const QPointF p( xMap.xTransform(x(i)), yMap.xTransform(y(i)) );
if ( pixelMatrix.testPixel(p.toPoint()) )
QwtPainter::drawPoint(painter, p.x(), p.y());
}
}
}
else
{
for (int i = from; i <= to; i++)
{
const double xi = xMap.xTransform(x(i));
const double yi = yMap.xTransform(y(i));
QwtPainter::drawPoint(painter, xi, yi);
if ( doFill )
polyline[i - from] = QPointF(xi, yi);
}
}
if ( doFill )
{
if ( d_data->canvasRect.isValid() && (d_data->paintAttributes & ClipPolygons) )
polyline = QwtClipper::clipPolygonF(d_data->canvasRect, polyline);
fillCurve(painter, xMap, yMap, polyline);
}
}