void preparePixmap() {
m_pixmap = QPixmap(size());
m_pixmap.fill(Qt::transparent);
QPainter p;
p.begin(&m_pixmap);
p.drawPixmap(0, 0, drawDigits(m_number, rect()));
p.end();
}
/*prepare the pixmap */
void Digit::preparePixmap()
{
m_pixmap = QPixmap(size());
m_pixmap.fill(Qt::transparent);
//Fills the pixmap with the given transparent black value (i.e., QColor(0, 0, 0, 0))
QPainter painter;
painter.begin(&m_pixmap);
painter.drawPixmap(0, 0, drawDigits(m_number, rect()));
//Draws the given digits-pixmap at position (0, 0)
painter.end();
}
/////////////////////////////////////////////////////////////////////
// main draw event for this control
/////////////////////////////////////////////////////////////////////
void CFreqCtrl::paintEvent(QPaintEvent *)
{
QPainter painter(&m_Pixmap);
if (m_UpdateAll) //if need to redraw everything
{
drawBkGround(painter);
m_UpdateAll = FALSE;
}
// draw any modified digits to the m_MemDC
drawDigits(painter);
//now draw pixmap onto screen
QPainter scrnpainter(this);
scrnpainter.drawPixmap(0,0,m_Pixmap); //blt to the screen(flickers like a candle, why?)
}
