void QwtScaleWidget::setColorMap(const QwtDoubleInterval &interval,
const QwtColorMap &colorMap)
{
d_data->colorBar.interval = interval;
delete d_data->colorBar.colorMap;
d_data->colorBar.colorMap = colorMap.copy();
if ( isColorBarEnabled() )
layoutScale();
}
/*!
Draw a color bar into a rectangle
\param painter Painter
\param colorMap Color map
\param interval Value range
\param scaleMap Scale map
\param orientation Orientation
\param rect Traget rectangle
*/
void QwtPainter::drawColorBar( QPainter *painter,
const QwtColorMap &colorMap, const QwtInterval &interval,
const QwtScaleMap &scaleMap, Qt::Orientation orientation,
const QRectF &rect )
{
QVector<QRgb> colorTable;
if ( colorMap.format() == QwtColorMap::Indexed )
colorTable = colorMap.colorTable( interval );
QColor c;
const QRect devRect = rect.toAlignedRect();
/*
We paint to a pixmap first to have something scalable for printing
( f.e. in a Pdf document )
*/
QPixmap pixmap( devRect.size() );
QPainter pmPainter( &pixmap );
pmPainter.translate( -devRect.x(), -devRect.y() );
if ( orientation == Qt::Horizontal )
{
QwtScaleMap sMap = scaleMap;
sMap.setPaintInterval( rect.left(), rect.right() );
for ( int x = devRect.left(); x <= devRect.right(); x++ )
{
const double value = sMap.invTransform( x );
if ( colorMap.format() == QwtColorMap::RGB )
c.setRgb( colorMap.rgb( interval, value ) );
else
c = colorTable[colorMap.colorIndex( interval, value )];
pmPainter.setPen( c );
pmPainter.drawLine( x, devRect.top(), x, devRect.bottom() );
}
}
else // Vertical
{
QwtScaleMap sMap = scaleMap;
sMap.setPaintInterval( rect.bottom(), rect.top() );
for ( int y = devRect.top(); y <= devRect.bottom(); y++ )
{
const double value = sMap.invTransform( y );
if ( colorMap.format() == QwtColorMap::RGB )
c.setRgb( colorMap.rgb( interval, value ) );
else
c = colorTable[colorMap.colorIndex( interval, value )];
pmPainter.setPen( c );
pmPainter.drawLine( devRect.left(), y, devRect.right(), y );
}
}
pmPainter.end();
drawPixmap( painter, rect, pixmap );
}
void QwtPainter::drawColorBar(QPainter *painter,
const QwtColorMap &colorMap, const QwtDoubleInterval &interval,
const QwtScaleMap &scaleMap, Qt::Orientation orientation,
const QRect &rect)
{
painter->save();
QwtPainter::setClipRect(painter, rect);
#if QT_VERSION < 0x040000
QValueVector<QRgb> colorTable;
#else
QVector<QRgb> colorTable;
#endif
if ( colorMap.format() == QwtColorMap::Indexed )
colorTable = colorMap.colorTable(interval);
QColor c;
const QRect devRect = d_metricsMap.layoutToDevice(rect);
if ( orientation == Qt::Horizontal )
{
QwtScaleMap sMap = scaleMap;
sMap.setPaintInterval(devRect.left(), devRect.right());
for ( int x = devRect.left(); x <= devRect.right(); x++ )
{
const double value = sMap.invTransform(x);
if ( colorMap.format() == QwtColorMap::RGB )
c.setRgb(colorMap.rgb(interval, value));
else
c = colorTable[colorMap.colorIndex(interval, value)];
painter->setBrush(QBrush(c));
const QRect r(x, devRect.top(), 1, devRect.height());
QwtPainter::drawRect(painter, r);
painter->setPen(c);
painter->drawLine(x, devRect.top(), x, devRect.bottom() - 1);
}
}
else // Vertical
{
QwtScaleMap sMap = scaleMap;
sMap.setPaintInterval(devRect.bottom(), devRect.top());
for ( int y = devRect.top(); y <= devRect.bottom(); y++ )
{
const double value = sMap.invTransform(y);
if ( colorMap.format() == QwtColorMap::RGB )
c.setRgb(colorMap.rgb(interval, value));
else
c = colorTable[colorMap.colorIndex(interval, value)];
painter->setPen(c);
painter->drawLine(devRect.left(), y, devRect.right() - 1, y);
}
}
painter->restore();
}