/*!
Draw the grid and axes
\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 radius Radius of the complete plot area in painter coordinates
\param canvasRect Contents rect of the canvas in painter coordinates
*/
void QwtPolarGrid::draw( QPainter *painter,
const QwtScaleMap &azimuthMap, const QwtScaleMap &radialMap,
const QwtDoublePoint &pole, double radius,
const QwtDoubleRect &canvasRect ) const
{
updateScaleDraws( azimuthMap, radialMap, pole, radius );
painter->save();
if ( testDisplayFlag( ClipAxisBackground ) )
{
QRegion clipRegion( canvasRect.toRect() );
for ( int axisId = 0; axisId < QwtPolar::AxesCount; axisId++ )
{
const AxisData &axis = d_data->axisData[axisId];
if ( axisId != QwtPolar::AxisAzimuth && axis.isVisible )
{
QwtScaleDraw *scaleDraw = ( QwtScaleDraw * )axis.scaleDraw;
if ( scaleDraw->hasComponent( QwtScaleDraw::Labels ) )
{
const QwtValueList &ticks =
scaleDraw->scaleDiv().ticks( QwtScaleDiv::MajorTick );
for ( int i = 0; i < int( ticks.size() ); i++ )
{
QRect labelRect =
scaleDraw->boundingLabelRect( axis.font, ticks[i] );
const int margin = 2;
labelRect.setRect(
labelRect.x() - margin,
labelRect.y() - margin,
labelRect.width() + 2 * margin,
labelRect.height() + 2 * margin
);
if ( labelRect.isValid() )
clipRegion -= QRegion( labelRect );
}
}
}
}
painter->setClipRegion( clipRegion );
}
// draw radial grid
const GridData &radialGrid = d_data->gridData[QwtPolar::Radius];
if ( radialGrid.isVisible && radialGrid.isMinorVisible )
{
painter->setPen( radialGrid.minorPen );
drawCircles( painter, canvasRect, pole, radialMap,
radialGrid.scaleDiv.ticks( QwtScaleDiv::MinorTick ) );
drawCircles( painter, canvasRect, pole, radialMap,
radialGrid.scaleDiv.ticks( QwtScaleDiv::MediumTick ) );
}
if ( radialGrid.isVisible )
{
painter->setPen( radialGrid.majorPen );
drawCircles( painter, canvasRect, pole, radialMap,
radialGrid.scaleDiv.ticks( QwtScaleDiv::MajorTick ) );
}
// draw azimuth grid
const GridData &azimuthGrid =
d_data->gridData[QwtPolar::Azimuth];
if ( azimuthGrid.isVisible && azimuthGrid.isMinorVisible )
{
painter->setPen( azimuthGrid.minorPen );
drawRays( painter, canvasRect, pole, radius, azimuthMap,
azimuthGrid.scaleDiv.ticks( QwtScaleDiv::MinorTick ) );
drawRays( painter, canvasRect, pole, radius, azimuthMap,
azimuthGrid.scaleDiv.ticks( QwtScaleDiv::MediumTick ) );
}
if ( azimuthGrid.isVisible )
{
painter->setPen( azimuthGrid.majorPen );
drawRays( painter, canvasRect, pole, radius, azimuthMap,
azimuthGrid.scaleDiv.ticks( QwtScaleDiv::MajorTick ) );
}
painter->restore();
for ( int axisId = 0; axisId < QwtPolar::AxesCount; axisId++ )
{
const AxisData &axis = d_data->axisData[axisId];
if ( axis.isVisible )
{
painter->save();
drawAxis( painter, axisId );
painter->restore();
}
}
}
