Method paintEvent

Modules/QtWidgetsExt/src/QmitkColorTransferFunctionCanvas.cpp:31–111

}

void QmitkColorTransferFunctionCanvas::paintEvent(QPaintEvent *)
{
  QPainter painter(this);

  // Render gray background
  QRect contentsRect = this->contentsRect();
  painter.setPen(Qt::gray);
  painter.drawRect(0, 0, contentsRect.width() + 1, contentsRect.height() + 1);

  if (!this->isEnabled())
    return;

  if (m_ColorTransferFunction)
  {
    for (int x = contentsRect.x(); x < contentsRect.x() + contentsRect.width(); x++)
    {
      double xVal = m_Min + ((float)x) / contentsRect.width() * (m_Max - m_Min);
      QColor col((int)(m_ColorTransferFunction->GetRedValue(xVal) * 255),
                 (int)(m_ColorTransferFunction->GetGreenValue(xVal) * 255),
                 (int)(m_ColorTransferFunction->GetBlueValue(xVal) * 255));
      painter.setPen(col);
      painter.drawLine(x, 1, x, contentsRect.height());
    }
  }

  // paint title
  if (m_Title.size() > 0)
  {
    painter.setPen(Qt::black);
    painter.drawText(QPoint(11, 21), m_Title);
    painter.setPen(Qt::white);
    painter.drawText(QPoint(10, 20), m_Title);
  }

  // paint min and max
  QString qs_min = QString::number(m_Min);
  QString qs_max = QString::number(m_Max);

  QRect qr_min = painter.fontMetrics().boundingRect(qs_min);
  QRect qr_max = painter.fontMetrics().boundingRect(qs_max);

  int y, x;

  y = this->contentsRect().height() - qr_min.height() + 5;
  x = 10;

  painter.setPen(Qt::black);
  painter.drawText(QPoint(x + 1, y + 1), qs_min);
  painter.setPen(Qt::white);
  painter.drawText(QPoint(x, y), qs_min);

  y = this->contentsRect().height() - qr_max.height() + 5;
  x = this->contentsRect().width() - qr_max.width() - 6;

  painter.setPen(Qt::black);
  painter.drawText(QPoint(x, y + 1), qs_max);
  painter.setPen(Qt::white);
  painter.drawText(QPoint(x, y), qs_max);