Is that any problem in my this function?

[HelloDan]

I'm sure that the data in the vector is OK. but I can not draw line.

[spirit]

can you show us code where you use this method?

[talk2amulya]

what is the size of avgPoints?

[HelloDan]

void GenePlotter::refreshPixmap()
{
    pixmap = QPixmap(size());
    pixmap.fill(this, 0, 0);
 
    QPainter painter(&pixmap);
    painter.initFrom(this);
    drawGrid(&painter);       // This line works perfectly good
 
    if(couter!=0)
    drawPlotterLine(&painter);    // here can't draw line
 
    update();	
}

void GenePlotter::refreshPixmap()
{
    pixmap = QPixmap(size());
    pixmap.fill(this, 0, 0);

    QPainter painter(&pixmap);
    painter.initFrom(this);
    drawGrid(&painter);       // This line works perfectly good
    
    if(couter!=0)
    drawPlotterLine(&painter);    // here can't draw line
    
    update();	
}

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[HelloDan]

what is the size of avgPoints?

In fact, the size will increase when the app runs, for example the size will increase from 1 to 100. And I will call the function to redraw the pixmap for 100 times.

[spirit]

stupid question, but maybe couter == 0?

[HelloDan]

stupid question, but maybe couter == 0?

No, the couter will increase. I make it draw only couter >0 ;

// In the construtor function
connect(oneStepButton,SIGNAL(clicked()),this,SLOT(oneStep()));
connect(runAllButton,SIGNAL(clicked()),this,SLOT(runAll()));

// In the construtor function
connect(oneStepButton,SIGNAL(clicked()),this,SLOT(oneStep()));
connect(runAllButton,SIGNAL(clicked()),this,SLOT(runAll()));

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[HelloDan]

// perform one generaion evolution and update the points of the plotter
void GenePlotter::execOnce()
{
    geneGroup.performEvolution();
  	QPointF point;
	  point.setX(couter);
	  point.setY(((geneGroup.getGroup())+GeneGroup::popSize)->getfitness());	
	  bestPoints.push_back(point);
 
	  point.setY(geneGroup.getAvg());
	  // x are the same of these two point.
    avgPoints.push_back(point);   
 
    refreshPixmap();  
}
 
 
void GenePlotter::oneStep()
{	
	++couter;
	if(couter<generation)
	{
	  execOnce();  
	}	
}
 
 
void GenePlotter::runAll()
{
	settingButton->setEnabled(false);
	oneStepButton->setEnabled(false);
	runAllButton->setEnabled(false);
	qApp->processEvents();
	if(couter==0)
		++couter;
 
  while(couter<generation)
  { 
  	++couter; 	
  	execOnce(); 
  	repaint(); 	
  }
  settingButton->setEnabled(true);
	oneStepButton->setEnabled(true);
	runAllButton->setEnabled(true);
 
}

// perform one generaion evolution and update the points of the plotter
void GenePlotter::execOnce()
{
    geneGroup.performEvolution();
  	QPointF point;
	  point.setX(couter);
	  point.setY(((geneGroup.getGroup())+GeneGroup::popSize)->getfitness());	
	  bestPoints.push_back(point);
    	
	  point.setY(geneGroup.getAvg());
	  // x are the same of these two point.
    avgPoints.push_back(point);   
    	   
    refreshPixmap();  
}


void GenePlotter::oneStep()
{	
	++couter;
	if(couter<generation)
	{
	  execOnce();  
	}	
}


void GenePlotter::runAll()
{
	settingButton->setEnabled(false);
	oneStepButton->setEnabled(false);
	runAllButton->setEnabled(false);
	qApp->processEvents();
	if(couter==0)
		++couter;
		
  while(couter<generation)
  { 
  	++couter; 	
  	execOnce(); 
  	repaint(); 	
  }
  settingButton->setEnabled(true);
	oneStepButton->setEnabled(true);
	runAllButton->setEnabled(true);
  
}

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More code

[spirit]

if you do this

void GenePlotter::refreshPixmap()
{
    pixmap = QPixmap(size());
    pixmap.fill(this, 0, 0);
 
    QPainter painter(&pixmap);
    painter.initFrom(this);
    drawGrid(&painter);       // This line works perfectly good
    drawPlotterLine(&painter);    // here can't draw line
 
    update();   
}

void GenePlotter::refreshPixmap()
{
    pixmap = QPixmap(size());
    pixmap.fill(this, 0, 0);
 
    QPainter painter(&pixmap);
    painter.initFrom(this);
    drawGrid(&painter);       // This line works perfectly good
    drawPlotterLine(&painter);    // here can't draw line
    
    update();   
}

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is something changed?

[HelloDan]

to #9

Fail, the same