/*!
\brief Draw an interval of the curve
\param painter Painter
\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 from index of the first point to be painted
\param to index of the last point to be painted. If to < 0 the
curve will be painted to its last point.
\sa drawCurve(), drawSymbols(),
*/
void QwtPolarCurve::draw( QPainter *painter,
const QwtScaleMap &azimuthMap, const QwtScaleMap &radialMap,
const QPointF &pole, int from, int to ) const
{
if ( !painter || dataSize() <= 0 )
return;
if ( to < 0 )
to = dataSize() - 1;
if ( qwtVerifyRange( dataSize(), from, to ) > 0 )
{
painter->save();
painter->setPen( d_data->pen );
drawCurve( painter, d_data->style,
azimuthMap, radialMap, pole, from, to );
painter->restore();
if ( d_data->symbol->style() != QwtSymbol::NoSymbol )
{
painter->save();
drawSymbols( painter, *d_data->symbol,
azimuthMap, radialMap, pole, from, to );
painter->restore();
}
}
}
/*!
Draw an interval of the curve
\param painter Painter
\param xMap Maps x-values into pixel coordinates.
\param yMap Maps y-values into pixel coordinates.
\param canvasRect Contents rectangle of the canvas
\param from Index of the first point to be painted
\param to Index of the last point to be painted. If to < 0 the
curve will be painted to its last point.
\sa drawCurve(), drawSymbols(),
*/
void QwtPlotCurve::drawSeries( QPainter *painter,
const QwtScaleMap &xMap, const QwtScaleMap &yMap,
const QRectF &canvasRect, int from, int to ) const
{
const size_t numSamples = dataSize();
if ( !painter || numSamples <= 0 )
return;
if ( to < 0 )
to = numSamples - 1;
if ( qwtVerifyRange( numSamples, from, to ) > 0 )
{
painter->save();
painter->setPen( d_data->pen );
/*
Qt 4.0.0 is slow when drawing lines, but it's even
slower when the painter has a brush. So we don't
set the brush before we really need it.
*/
drawCurve( painter, d_data->style, xMap, yMap, canvasRect, from, to );
painter->restore();
if ( d_data->symbol &&
( d_data->symbol->style() != QwtSymbol::NoSymbol ) )
{
painter->save();
drawSymbols( painter, *d_data->symbol,
xMap, yMap, canvasRect, from, to );
painter->restore();
}
}
}
