void RangeHistogram::mouseMoveEvent(QMouseEvent *e)
{
QPoint pos = e->pos();
if(ValidRange() && (e->buttons() & Qt::LeftButton) && pos != m_MousePrev)
{
if(m_DragMode == DraggingMode::White)
{
float newWhite = (float)(pos.x() - totalSpace()) / (float)regionWidth();
setWhiteDelta(qBound(blackDelta() + m_MinRangeSize, newWhite, 1.0f));
}
else if(m_DragMode == DraggingMode::Black)
{
float newBlack = (float)(pos.x() - totalSpace()) / (float)regionWidth();
setBlackDelta(qBound(0.0f, newBlack, whiteDelta() - m_MinRangeSize));
}
emit rangeUpdated();
if(m_DragMode != DraggingMode::None)
update();
m_MousePrev = pos;
}
}
//--------------------------------------------------------------------------------------------------
/// Sets the max and min level of the legend. If the levels previously has been set with setLevelsFromValues()
/// only the values between the new max min range becomes visible.
//--------------------------------------------------------------------------------------------------
void ScalarMapperRangeBased::setRange(double min, double max)
{
m_rangeMin = min;
m_rangeMax = max;
updateSortedLevels();
rangeUpdated();
}
void RangeHistogram::setWhitePoint(float val)
{
if(val >= m_RangeMax)
m_WhitePoint = m_RangeMax = val;
else
m_WhitePoint = val;
update();
emit rangeUpdated();
}
void RangeHistogram::setBlackPoint(float val)
{
if(val <= m_RangeMin)
m_BlackPoint = m_RangeMin = val;
else
m_BlackPoint = val;
update();
emit rangeUpdated();
}
// sets the minimum and maximum as well as the black and white points
void RangeHistogram::setRange(float min, float max)
{
m_RangeMin = min;
if(min < 0.0f)
m_RangeMax = qMax((min - FLT_EPSILON) * (1.0f - m_MinRangeSize), max);
else
m_RangeMax = qMax((min + FLT_EPSILON) * (1.0f + m_MinRangeSize), max);
m_BlackPoint = m_RangeMin;
m_WhitePoint = m_RangeMax;
update();
emit rangeUpdated();
}
void RangeHistogram::mousePressEvent(QMouseEvent *e)
{
if(e->button() != Qt::LeftButton || !ValidRange())
return;
QRect r = rect();
r.marginsRemoved(QMargins(totalSpace(), totalSpace(), totalSpace(), totalSpace()));
int whiteX = (int)(whiteDelta() * r.width());
int blackX = (int)(blackDelta() * r.width());
QPointF whiteVec(whiteX - e->pos().x(), rect().height() - e->pos().y());
QPointF blackVec(blackX - e->pos().x(), e->pos().y());
float whitedist = (float)sqrt(whiteVec.x() * whiteVec.x() + whiteVec.y() * whiteVec.y());
float blackdist = (float)sqrt(blackVec.x() * blackVec.x() + blackVec.y() * blackVec.y());
if(whitedist < blackdist && whitedist < 18.0f)
m_DragMode = DraggingMode::White;
else if(blackdist < whitedist && blackdist < 18.0f)
m_DragMode = DraggingMode::Black;
else if(e->pos().x() > whiteX)
m_DragMode = DraggingMode::White;
else if(e->pos().x() < blackX)
m_DragMode = DraggingMode::Black;
if(m_DragMode == DraggingMode::White)
{
float newWhite = (float)(e->pos().x() - totalSpace()) / (float)regionWidth();
setWhiteDelta(qBound(blackDelta() + m_MinRangeSize, newWhite, 1.0f));
}
else if(m_DragMode == DraggingMode::Black)
{
float newBlack = (float)(e->pos().x() - totalSpace()) / (float)regionWidth();
setBlackDelta(qBound(0.0f, newBlack, whiteDelta() - m_MinRangeSize));
}
emit rangeUpdated();
if(m_DragMode != DraggingMode::None)
update();
m_MousePrev = e->pos();
}