/*!
Calculate the transformation that is needed to paint a label
depending on its alignment and rotation.
\param pos Position where to paint the label
\param size Size of the label
\sa setLabelAlignment(), setLabelRotation()
*/
QTransform QwtScaleDraw::labelTransformation(
const QPointF &pos, const QSizeF &size ) const
{
QTransform transform;
transform.translate( pos.x(), pos.y() );
transform.rotate( labelRotation() );
int flags = labelAlignment();
if ( flags == 0 )
{
switch ( alignment() )
{
case RightScale:
{
if ( flags == 0 )
flags = Qt::AlignRight | Qt::AlignVCenter;
break;
}
case LeftScale:
{
if ( flags == 0 )
flags = Qt::AlignLeft | Qt::AlignVCenter;
break;
}
case BottomScale:
{
if ( flags == 0 )
flags = Qt::AlignHCenter | Qt::AlignBottom;
break;
}
case TopScale:
{
if ( flags == 0 )
flags = Qt::AlignHCenter | Qt::AlignTop;
break;
}
}
}
double x, y;
if ( flags & Qt::AlignLeft )
x = -size.width();
else if ( flags & Qt::AlignRight )
x = 0.0;
else // Qt::AlignHCenter
x = -( 0.5 * size.width() );
if ( flags & Qt::AlignTop )
y = -size.height();
else if ( flags & Qt::AlignBottom )
y = 0;
else // Qt::AlignVCenter
y = -( 0.5 * size.height() );
transform.translate( x, y );
return transform;
}
/*!
Calculate the matrix that is needed to paint a label
depending on its alignment and rotation.
\param pos Position where to paint the label
\param size Size of the label
\sa setLabelAlignment(), setLabelRotation()
*/
QwtMatrix QwtScaleDraw::labelMatrix(
const QPoint &pos, const QSize &size) const
{
QwtMatrix m;
m.translate(pos.x(), pos.y());
m.rotate(labelRotation());
int flags = labelAlignment();
if ( flags == 0 )
{
switch(alignment())
{
case RightScale:
{
if ( flags == 0 )
flags = Qt::AlignRight | Qt::AlignVCenter;
break;
}
case LeftScale:
{
if ( flags == 0 )
flags = Qt::AlignLeft | Qt::AlignVCenter;
break;
}
case BottomScale:
{
if ( flags == 0 )
flags = Qt::AlignHCenter | Qt::AlignBottom;
break;
}
case TopScale:
{
if ( flags == 0 )
flags = Qt::AlignHCenter | Qt::AlignTop;
break;
}
}
}
const int w = size.width();
const int h = size.height();
int x, y;
if ( flags & Qt::AlignLeft )
x = -w;
else if ( flags & Qt::AlignRight )
x = -(w % 2);
else // Qt::AlignHCenter
x = -(w / 2);
if ( flags & Qt::AlignTop )
y = -h ;
else if ( flags & Qt::AlignBottom )
y = -(h % 2);
else // Qt::AlignVCenter
y = -(h/2);
m.translate(x, y);
return m;
}
int QwtScaleDraw::minLabelDist(const QFont &font) const
{
if ( !hasComponent(QwtAbstractScaleDraw::Labels) )
return 0;
const QwtValueList &ticks = scaleDiv().ticks(QwtScaleDiv::MajorTick);
if (ticks.count() == 0)
return 0;
const QFontMetrics fm(font);
const bool vertical = (orientation() == Qt::Vertical);
QRect bRect1;
QRect bRect2 = labelRect(font, ticks[0]);
if ( vertical )
{
bRect2.setRect(-bRect2.bottom(), 0, bRect2.height(), bRect2.width());
}
int maxDist = 0;
for (uint i = 1; i < (uint)ticks.count(); i++ )
{
bRect1 = bRect2;
bRect2 = labelRect(font, ticks[i]);
if ( vertical )
{
bRect2.setRect(-bRect2.bottom(), 0,
bRect2.height(), bRect2.width());
}
int dist = fm.leading(); // space between the labels
if ( bRect1.right() > 0 )
dist += bRect1.right();
if ( bRect2.left() < 0 )
dist += -bRect2.left();
if ( dist > maxDist )
maxDist = dist;
}
double angle = labelRotation() / 180.0 * M_PI;
if ( vertical )
angle += M_PI / 2;
if ( sin(angle) == 0.0 )
return maxDist;
const int fmHeight = fm.ascent() - 2;
// The distance we need until there is
// the height of the label font. This height is needed
// for the neighbour labal.
int labelDist = (int)(fmHeight / sin(angle) * cos(angle));
if ( labelDist < 0 )
labelDist = -labelDist;
// The cast above floored labelDist. We want to ceil.
labelDist++;
// For text orientations close to the scale orientation
if ( labelDist > maxDist )
labelDist = maxDist;
// For text orientations close to the opposite of the
// scale orientation
if ( labelDist < fmHeight )
labelDist = fmHeight;
return labelDist;
}
int QwtScaleDraw::minLabelDist( const QFont &font ) const
{
if ( !hasComponent( QwtAbstractScaleDraw::Labels ) )
return 0;
const QList<double> &ticks = scaleDiv().ticks( QwtScaleDiv::MajorTick );
if ( ticks.isEmpty() )
return 0;
const QFontMetrics fm( font );
const bool vertical = ( orientation() == Qt::Vertical );
QRectF bRect1;
QRectF bRect2 = labelRect( font, ticks[0] );
if ( vertical )
{
bRect2.setRect( -bRect2.bottom(), 0.0, bRect2.height(), bRect2.width() );
}
double maxDist = 0.0;
for ( int i = 1; i < ticks.count(); i++ )
{
bRect1 = bRect2;
bRect2 = labelRect( font, ticks[i] );
if ( vertical )
{
bRect2.setRect( -bRect2.bottom(), 0.0,
bRect2.height(), bRect2.width() );
}
double dist = fm.leading(); // space between the labels
if ( bRect1.right() > 0 )
dist += bRect1.right();
if ( bRect2.left() < 0 )
dist += -bRect2.left();
if ( dist > maxDist )
maxDist = dist;
}
double angle = qwtRadians( labelRotation() );
if ( vertical )
angle += M_PI / 2;
const double sinA = qFastSin( angle ); // qreal -> double
if ( qFuzzyCompare( sinA + 1.0, 1.0 ) )
return qCeil( maxDist );
const int fmHeight = fm.ascent() - 2;
// The distance we need until there is
// the height of the label font. This height is needed
// for the neighbored label.
double labelDist = fmHeight / qFastSin( angle ) * qFastCos( angle );
if ( labelDist < 0 )
labelDist = -labelDist;
// For text orientations close to the scale orientation
if ( labelDist > maxDist )
labelDist = maxDist;
// For text orientations close to the opposite of the
// scale orientation
if ( labelDist < fmHeight )
labelDist = fmHeight;
return qCeil( labelDist );
}
