Method paint

ASAP/annotation/MeasurementQtAnnotation.cpp:43–86

}

void MeasurementQtAnnotation::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
  QWidget *widget) {
  if (_annotation) {
    QColor lineColor = this->getDrawingColor();
    _currentLoD = option->levelOfDetailFromTransform(painter->worldTransform());
    std::vector<Point> coords = _annotation->getCoordinates();
    if (coords.size() > 1) {
      if (isSelected()) {
        painter->setPen(QPen(QBrush(lineColor.lighter(150)), _lineAnnotationSelectedThickness / _currentLoD));
      }
      else {
        painter->setPen(QPen(QBrush(lineColor), _lineThickness / _currentLoD));
      }
      painter->drawLine(QPointF(0, 0), this->mapFromScene(coords[coords.size() - 1].getX()*_scale, coords[coords.size() - 1].getY()*_scale));
      Point firstPoint = coords[0];
      Point lastPoint = coords[coords.size() - 1];
      QPointF centerPoint = this->mapFromScene(lastPoint.getX()*_scale, lastPoint.getY()*_scale) / 2;
      float vecLength = sqrt(QPointF::dotProduct(centerPoint, centerPoint));
      QPointF unitVec = QPointF(centerPoint.y(), -centerPoint.x()) / vecLength;
      QPointF textPos = centerPoint.y() < 0 ? (centerPoint - (15 / _currentLoD) * unitVec) * _currentLoD : (centerPoint + (15 / _currentLoD) * unitVec) * _currentLoD;;
      QPainterPath textPath;
      QFont ft = QFont("Arial");
      float sizeInPixels = sqrt(pow(firstPoint.getX() - lastPoint.getX(), 2) + pow(firstPoint.getY() - lastPoint.getY(), 2));
      if (_spacing.size() > 0) {
        float sizeInUnits = sizeInPixels * _spacing[0];
        QString unit = " um";
        if (sizeInUnits > 1000) {
          sizeInUnits /= 1000;
          unit = " mm";
        }
        textPath.addText(textPos, ft, QString::number(sizeInUnits, 'g', 4) + unit);
      }
      else {        
        textPath.addText(textPos, ft, QString::number(sizeInPixels) + QString(" pixels"));
      }
      painter->scale(1.5 / _currentLoD, 1.5 / _currentLoD);
      painter->setPen(Qt::NoPen);
      painter->setBrush(QBrush(QColor(0,0,0,75)));
      painter->drawRect(textPath.boundingRect().adjusted(-5,-5,5,5));
      painter->setBrush(QBrush(Qt::white));
      painter->drawPath(textPath);
    }
  }
}

bool MeasurementQtAnnotation::collidesWithPath(const QPainterPath & path, Qt::ItemSelectionMode mode) const {
  return contains(path.currentPosition());