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;
}
static Polygon qwtMapPointsQuad( const QwtScaleMap &xMap, const QwtScaleMap &yMap,
const QwtSeriesData<QPointF> *series, int from, int to )
{
const QPointF sample0 = series->sample( from );
PolygonQuadrupel q;
q.start( qwtRoundValue( xMap.transform( sample0.x() ) ),
qwtRoundValue( yMap.transform( sample0.y() ) ) );
Polygon polyline;
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 ( !q.append( x, y ) )
{
q.flush( polyline );
q.start( x, y );
}
}
q.flush( polyline );
return polyline;
}
inline double operator()( double value )
{
return static_cast<double>( qwtRoundValue( value ) );
}
inline int operator()( double value )
{
return qwtRoundValue( value );
}