double_pair ImageDefaultTFGenerator::ensureNonZeroRoundedRange(double_pair range) const
{
range.first = roundAwayFromZero(range.first);
range.second = roundAwayFromZero(range.second);
range.second = std::max(range.second, range.first+1);
return range;
}
ImageTF3DPtr ImageDefaultTFGenerator::generate3DTFPreset()
{
ImageTF3DPtr tf(new ImageTF3D());
double_pair range = this->guessInitialScalarRange();
double smin = range.first;
double smax = range.second;
double srange = smax - smin;
IntIntMap opacity;
// Note the ordering: add in descending order to ensure zero is
// always written into smin, also for binary volumes
// Round is required for binary volumes.
opacity[smin + roundAwayFromZero(0.5*srange)] = 255;
opacity[smin + roundAwayFromZero(0.3*srange)] = 255.0 * 0.7;
opacity[smin + roundAwayFromZero(0.1*srange)] = 0;
tf->resetAlpha(opacity);
ColorMap colors;
colors[smin] = QColor(Qt::black);
colors[smax] = QColor(Qt::white);
tf->resetColor(colors);
return tf;
}
TransferFunctionAlphaWidget::AlphaPoint TransferFunctionAlphaWidget::getCurrentAlphaPoint(QPoint pos)
{
AlphaPoint point;
double dposition = mImage->getMin() + mImage->getRange() * double(pos.x() - mPlotArea.left()) / mPlotArea.width();
double dvalue = mImage->getMaxAlphaValue() * double(mPlotArea.bottom() - pos.y())/mPlotArea.height();
point.position = roundAwayFromZero(dposition);
point.value = roundAwayFromZero(dvalue);
point.position = constrainValue(point.position, mImage->getMin(), mImage->getMax());
point.value = constrainValue(point.value, 0, mImage->getMaxAlphaValue());
return point;
}
