Painting problem

[ScoOteR]

Hay Fellows,

I'm trying to make some thing like stock ticker here, but i have problem with the rendering behavior. I've attached a sample video of the run. Any wayz, i'm having a timer that fires each 30 msecs, on the fire it calls animate() - connected with a direct connection - which updates the translation variable and calls update().

In the PaintEvent(), i starts the translations and rendering the ticker items. If any one please could help me here.

void CSymbolsTicker::animate()
{
	qreal last = m_rTranslationStep * m_itime * 0.0001;
	m_itime = (m_itime + qobject_cast<QTimer*>(sender())->interval()) % 1000;
	qreal current = m_rTranslationStep * m_itime * 0.0001;
	current -= last;
	if(current * m_iDirection < 0)
		current = m_rDiff;
	else
		m_rDiff = current;
	m_rTranslationX += m_rDiff;
	.....
	update();
}

void CSymbolsTicker::animate()
{
	qreal last = m_rTranslationStep * m_itime * 0.0001;
	m_itime = (m_itime + qobject_cast<QTimer*>(sender())->interval()) % 1000;
	qreal current = m_rTranslationStep * m_itime * 0.0001;
	current -= last;
	if(current * m_iDirection < 0)
		current = m_rDiff;
	else
		m_rDiff = current;
	m_rTranslationX += m_rDiff;
	.....
	update();
}

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void CSymbolsTicker::paintEvent(QPaintEvent *event)
{
	CTicker::paintEvent(event);
	m_pPainter->begin(this);
	m_pPainter->setRenderHint(QPainter::TextAntialiasing/*QPainter::Antialiasing*/);
 
	m_pPainter->setFont(m_Font);
 
	m_pPainter->translate(m_rTranslationX,0);
	for (int i=0;i<m_vSymbols.count();++i)
	{
		m_rCurrentTranslationStep = m_vSymbols[i]->GetWidth() * -1;
		if(InViewPort())
		{
			SetPen(m_vSymbols[i]->GetStatus());
			m_vSymbols[i]->paint(m_pPainter,event,height());
			m_pPainter->translate(m_rCurrentTranslationStep,0);
		}
	}
	m_pPainter->end();
}

void CSymbolsTicker::paintEvent(QPaintEvent *event)
{
	CTicker::paintEvent(event);
	m_pPainter->begin(this);
	m_pPainter->setRenderHint(QPainter::TextAntialiasing/*QPainter::Antialiasing*/);

	m_pPainter->setFont(m_Font);

	m_pPainter->translate(m_rTranslationX,0);
	for (int i=0;i<m_vSymbols.count();++i)
	{
		m_rCurrentTranslationStep = m_vSymbols[i]->GetWidth() * -1;
		if(InViewPort())
		{
			SetPen(m_vSymbols[i]->GetStatus());
			m_vSymbols[i]->paint(m_pPainter,event,height());
			m_pPainter->translate(m_rCurrentTranslationStep,0);
		}
	}
	m_pPainter->end();
}

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[Tonal]

Maybe better draw to QPixmap all scene?

[ScoOteR]

well, I've tried it before and nothing changed !!!

[ScoOteR]

still no body has any proposal !!!!

[guilugi]

Excuse me, but could you explain your rendering issue more precisely ?
By watching the video, I can't see what's wrong...

[ScoOteR]

well, text animation is not smooth. if u looked at the text for a while ur eye's will hurt. besides if the animation was at higher speed u won't be able to read the text @ all !!