Problem with QPainter drawText() not rendering text at large coordinates

[cgomez116]

I found a work around for this, as suggested in bug 192573:
http://qt.nokia.com/developer/task-t...ntry&id=192573

I used the worldTransform to translate the painter, so that I can use position offsets in drawText() that start at 0.

void TimeRulerItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
  Q_UNUSED(widget);
 
  if(option->levelOfDetail < 0.05) return;
 
  QColor fillColor = (option->state & QStyle::State_Selected) ? Bg.dark(150) : Bg;
 
  if (option->state & QStyle::State_MouseOver)
    fillColor = fillColor.light(125);
 
  QColor color;
  qreal width;
  if (option->state & QStyle::State_MouseOver) {
    color = QColor(Qt::yellow);
    width = 1.0;
  } else {
    color = Fg;
    width = 0.75;
  }
 
  painter->setFont(QApplication::font());
  painter->setBrush(QBrush(fillColor.dark(option->state & QStyle::State_Sunken ? 120 : 100)));
  painter->setPen(QPen(color, width));
 
  const QRectF exposed = option->exposedRect;
  const qreal ex_left   = exposed.left();
  const qreal ex_right  = exposed.right();
 
  const qint64 start_tick = (qint64)ex_left/TICK_WIDTH;
  const qint64   end_tick = (qint64)ex_right/TICK_WIDTH;
 
  const qint64 n_tick = start_tick*TICK_WIDTH;
  const qint64 n_tick_1 = n_tick - 1;
 
  QTransform wt = painter->worldTransform();
  wt.translate(n_tick_1, 0);
  painter->setWorldTransform(wt);
 
  for(qint64 i = 0; i <= end_tick-start_tick; i++) {
    const qint64 time        = i + start_tick + StartTime;
    const qint64 time_mod_10 = time%10;
 
    // Draw the tick mod 10 lines:
    if(time%10 == 0) painter->drawLine(i*TICK_WIDTH, TICK_HEIGHT, i*TICK_WIDTH, -2*TICK_HEIGHT);
 
    if(option->levelOfDetail < 0.5) return;
 
    // Draw tick line every 10 ticks:
    painter->setPen(QPen(color, width));
    const QString time_str        = QString::number(time);
    const QString time_mod_10_str = QString::number(time_mod_10);
 
    const qint64 x   =  i*TICK_WIDTH;
    const qint64 x_1 = (i*TICK_WIDTH) + 1;
 
    const QPoint pt   = QPoint(x  , -1);
    const QPoint pt_1 = QPoint(x_1, 11);
 
    // Draw full time every 10 ticks:
    if(time%10 == 0) painter->drawText(pt, time_str);
 
    // Draw time mod 10 (tick number):
    painter->drawText(pt_1, time_mod_10_str);
  }
}

void TimeRulerItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
  Q_UNUSED(widget);

  if(option->levelOfDetail < 0.05) return;

  QColor fillColor = (option->state & QStyle::State_Selected) ? Bg.dark(150) : Bg;

  if (option->state & QStyle::State_MouseOver)
    fillColor = fillColor.light(125);

  QColor color;
  qreal width;
  if (option->state & QStyle::State_MouseOver) {
    color = QColor(Qt::yellow);
    width = 1.0;
  } else {
    color = Fg;
    width = 0.75;
  }

  painter->setFont(QApplication::font());
  painter->setBrush(QBrush(fillColor.dark(option->state & QStyle::State_Sunken ? 120 : 100)));
  painter->setPen(QPen(color, width));

  const QRectF exposed = option->exposedRect;
  const qreal ex_left   = exposed.left();
  const qreal ex_right  = exposed.right();

  const qint64 start_tick = (qint64)ex_left/TICK_WIDTH;
  const qint64   end_tick = (qint64)ex_right/TICK_WIDTH;

  const qint64 n_tick = start_tick*TICK_WIDTH;
  const qint64 n_tick_1 = n_tick - 1;
 
  QTransform wt = painter->worldTransform();
  wt.translate(n_tick_1, 0);
  painter->setWorldTransform(wt);

  for(qint64 i = 0; i <= end_tick-start_tick; i++) {
    const qint64 time        = i + start_tick + StartTime;
    const qint64 time_mod_10 = time%10;

    // Draw the tick mod 10 lines:
    if(time%10 == 0) painter->drawLine(i*TICK_WIDTH, TICK_HEIGHT, i*TICK_WIDTH, -2*TICK_HEIGHT);

    if(option->levelOfDetail < 0.5) return;

    // Draw tick line every 10 ticks:
    painter->setPen(QPen(color, width));
    const QString time_str        = QString::number(time);
    const QString time_mod_10_str = QString::number(time_mod_10);

    const qint64 x   =  i*TICK_WIDTH;
    const qint64 x_1 = (i*TICK_WIDTH) + 1;

    const QPoint pt   = QPoint(x  , -1);
    const QPoint pt_1 = QPoint(x_1, 11);

    // Draw full time every 10 ticks:
    if(time%10 == 0) painter->drawText(pt, time_str);

    // Draw time mod 10 (tick number):
    painter->drawText(pt_1, time_mod_10_str);
  }
}

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