/*!
Draws the label for a major scale tick
\param painter Painter
\param value Value
\sa drawTick(), drawBackbone()
*/
void QwtRoundScaleDraw::drawLabel( QPainter *painter, double value ) const
{
const QwtText label = tickLabel( painter->font(), value );
if ( label.isEmpty() )
return;
const double tval = scaleMap().transform( value );
if ( ( tval > d_data->startAngle + 359 * 16 )
|| ( tval < d_data->startAngle - 359 * 16 ) )
{
return;
}
double radius = d_data->radius;
if ( hasComponent( QwtAbstractScaleDraw::Ticks ) ||
hasComponent( QwtAbstractScaleDraw::Backbone ) )
{
radius += spacing();
}
if ( hasComponent( QwtAbstractScaleDraw::Ticks ) )
radius += tickLength( QwtScaleDiv::MajorTick );
const QSizeF sz = label.textSize( painter->font() );
const double arc = tval / 16.0 / 360.0 * 2 * M_PI;
const double x = d_data->center.x() +
( radius + sz.width() / 2.0 ) * qSin( arc );
const double y = d_data->center.y() -
( radius + sz.height() / 2.0 ) * cos( arc );
const QRectF r( x - sz.width() / 2, y - sz.height() / 2,
sz.width(), sz.height() );
label.draw( painter, r );
}
/*!
Find the position, where to paint a label
The position has a distance that depends on the length of the ticks
in direction of the alignment().
\param value Value
\return Position, where to paint a label
*/
QPointF QwtScaleDraw::labelPosition( double value ) const
{
const double tval = scaleMap().transform( value );
double dist = spacing();
if ( hasComponent( QwtAbstractScaleDraw::Backbone ) )
dist += qMax( 1, penWidth() );
if ( hasComponent( QwtAbstractScaleDraw::Ticks ) )
dist += tickLength( QwtScaleDiv::MajorTick );
double px = 0;
double py = 0;
switch ( alignment() )
{
case RightScale:
{
px = d_data->pos.x() + dist;
py = tval;
break;
}
case LeftScale:
{
px = d_data->pos.x() - dist;
py = tval;
break;
}
case BottomScale:
{
px = tval;
py = d_data->pos.y() + dist;
break;
}
case TopScale:
{
px = tval;
py = d_data->pos.y() - dist;
break;
}
}
return QPointF( px, py );
}
void ScaleDraw::drawInwardTick(QPainter *painter, double value, int len) const
{
ScaleEngine *sc_engine = (ScaleEngine *)d_plot->axisScaleEngine(axis());
if (sc_engine->hasBreak() && (sc_engine->axisBreakLeft() <= value && sc_engine->axisBreakRight() >= value))
return;
int pw2 = qwtMin((int)painter->pen().width(), len) / 2;
QwtScaleMap scaleMap = map();
const QwtMetricsMap metricsMap = QwtPainter::metricsMap();
QPoint pos = this->pos();
int majLen = tickLength(QwtScaleDiv::MajorTick);
if ( !metricsMap.isIdentity() ){
/*
The perfect position of the ticks is important.
To avoid rounding errors we have to use
device coordinates.
*/
QwtPainter::resetMetricsMap();
pos = metricsMap.layoutToDevice(pos);
if ( orientation() == Qt::Vertical ){
scaleMap.setPaintInterval(
metricsMap.layoutToDeviceY((int)scaleMap.p1()),
metricsMap.layoutToDeviceY((int)scaleMap.p2())
);
len = metricsMap.layoutToDeviceX(len);
majLen = metricsMap.layoutToDeviceX(majLen);
} else {
scaleMap.setPaintInterval(
metricsMap.layoutToDeviceX((int)scaleMap.p1()),
metricsMap.layoutToDeviceX((int)scaleMap.p2())
);
len = metricsMap.layoutToDeviceY(len);
majLen = metricsMap.layoutToDeviceY(majLen);
}
}
const int clw = d_plot->canvasLineWidth();
const int tval = scaleMap.transform(value);
bool draw = false;
if ( orientation() == Qt::Vertical ){
int low = (int)scaleMap.p2() + majLen;
int high = (int)scaleMap.p1() - majLen;
if ((tval > low && tval < high) ||
(tval > high && !d_plot->axisEnabled (QwtPlot::xBottom) && !clw) ||
(tval < low && !d_plot->axisEnabled(QwtPlot::xTop) && !clw)) draw = true;
} else {
int low = (int)scaleMap.p1() + majLen;
int high = (int)scaleMap.p2() - majLen;
if ((tval > low && tval < high) ||
(tval > high && !d_plot->axisEnabled(QwtPlot::yRight) && !clw) ||
(tval < low && !d_plot->axisEnabled(QwtPlot::yLeft) && !clw)) draw = true;
}
if (draw){
switch(alignment()){
case LeftScale:
{
QwtPainter::drawLine(painter, pos.x() + pw2, tval, pos.x() + len, tval);
break;
}
case RightScale:
{
QwtPainter::drawLine(painter, pos.x() - pw2, tval, pos.x() - len, tval);
break;
}
case BottomScale:
{
QwtPainter::drawLine(painter, tval, pos.y() - pw2, tval, pos.y() - len);
break;
}
case TopScale:
{
QwtPainter::drawLine(painter, tval, pos.y() + pw2, tval, pos.y() + len);
break;
}
}
}
QwtPainter::setMetricsMap(metricsMap); // restore metrics map
}
