/*!
\brief Qt Paint Event
\param event Paint event
*/
void QwtWheel::paintEvent( QPaintEvent *event )
{
QPainter painter( this );
painter.setClipRegion( event->region() );
QStyleOption opt;
opt.init(this);
style()->drawPrimitive(QStyle::PE_Widget, &opt, &painter, this);
qDrawShadePanel( &painter,
contentsRect(), palette(), true, d_data->borderWidth );
drawWheelBackground( &painter, wheelRect() );
drawTicks( &painter, wheelRect() );
if ( hasFocus() )
QwtPainter::drawFocusRect( &painter, this );
}
/*!
\brief Redraw the wheel
\param painter painter
\param r contents rectangle
*/
void QwtWheel::drawWheel( QPainter *painter, const QRect &r )
{
//
// draw background gradient
//
drawWheelBackground( painter, r );
if ( maxValue() == minValue() || d_data->totalAngle == 0.0 )
return;
#if QT_VERSION < 0x040000
const QColor light = colorGroup().light();
const QColor dark = colorGroup().dark();
#else
const QColor light = palette().color(QPalette::Light);
const QColor dark = palette().color(QPalette::Dark);
#endif
const double sign = (minValue() < maxValue()) ? 1.0 : -1.0;
double cnvFactor = qwtAbs(d_data->totalAngle / (maxValue() - minValue()));
const double halfIntv = 0.5 * d_data->viewAngle / cnvFactor;
const double loValue = value() - halfIntv;
const double hiValue = value() + halfIntv;
const double tickWidth = 360.0 / double(d_data->tickCnt) / cnvFactor;
const double sinArc = sin(d_data->viewAngle * M_PI / 360.0);
cnvFactor *= M_PI / 180.0;
//
// draw grooves
//
if ( orientation() == Qt::Horizontal )
{
const double halfSize = double(r.width()) * 0.5;
int l1 = r.y() + d_data->intBorder;
int l2 = r.y() + r.height() - d_data->intBorder - 1;
// draw one point over the border if border > 1
if ( d_data->intBorder > 1 )
{
l1 --;
l2 ++;
}
const int maxpos = r.x() + r.width() - 2;
const int minpos = r.x() + 2;
//
// draw tick marks
//
for ( double tickValue = ceil(loValue / tickWidth) * tickWidth;
tickValue < hiValue; tickValue += tickWidth )
{
//
// calculate position
//
const int tickPos = r.x() + r.width()
- int( halfSize
* (sinArc + sign * sin((tickValue - value()) * cnvFactor))
/ sinArc);
//
// draw vertical line
//
if ( (tickPos <= maxpos) && (tickPos > minpos) )
{
painter->setPen(dark);
painter->drawLine(tickPos -1 , l1, tickPos - 1, l2 );
painter->setPen(light);
painter->drawLine(tickPos, l1, tickPos, l2);
}
}
}
else if ( orientation() == Qt::Vertical )
{
const double halfSize = double(r.height()) * 0.5;
int l1 = r.x() + d_data->intBorder;
int l2 = r.x() + r.width() - d_data->intBorder - 1;
if ( d_data->intBorder > 1 )
{
l1--;
l2++;
}
const int maxpos = r.y() + r.height() - 2;
const int minpos = r.y() + 2;
//
// draw tick marks
//
for ( double tickValue = ceil(loValue / tickWidth) * tickWidth;
tickValue < hiValue; tickValue += tickWidth )
{
//
// calculate position
//
const int tickPos = r.y() + int( halfSize *
(sinArc + sign * sin((tickValue - value()) * cnvFactor))
/ sinArc);
//
// draw horizontal line
//
if ( (tickPos <= maxpos) && (tickPos > minpos) )
{
painter->setPen(dark);
painter->drawLine(l1, tickPos - 1 ,l2, tickPos - 1);
painter->setPen(light);
painter->drawLine(l1, tickPos, l2, tickPos);
}
}
}
}