Re: QwtCurve::Steps Flickering

[Sathya K. <kri...@is...>]

Hi Uwe:

I couldn't spot the problem.. Im attaching the code.

Thanks for your help.

cheers
Sathya


------****------


#include <qapplication.h>
#include <qlabel.h>
#include <qwt.h>
#include <qtable.h>
#include <qmainwindow.h>
#include <qwt_plot.h>
#include <qwidget.h>

using std:: vector;

class MyScatterWidget : public QwtPlot {
public:
	MyScatterWidget (QWidget * parent);
};

class MyHistWidget : public QwtPlot {
public:
	MyHistWidget (QWidget *);
};=09


MyScatterWidget::MyScatterWidget (QWidget * parent) : QwtPlot(parent)
{
	setMouseTracking (true);
	setTitle(QString(" "));
	setCanvasBackground(white);

	setAxisFont(QwtPlot::Axis::yLeft, QFont("sansserif", 5, QFont::Normal,=20
TRUE));
	setAxisFont(QwtPlot::Axis::xBottom, QFont("sansserif", 5,=20
QFont::Normal, TRUE));
	enableAxis (QwtPlot::xBottom , false);
	enableAxis (QwtPlot::yLeft , false);
	enableGridXMin (false);
	enableGridX (false);
	enableGridYMin (false);
	enableGridY (false);
	enableLegend (false);
	setAutoLegend (false);
	enableOutline (false);

	vector <double> xvals;
	vector <double> yvals;

	xvals.resize (100);
	yvals.resize (100);
	for (int i=3D0; i < 100; i++) {
		yvals[i] =3D rand ();
		xvals[i] =3D rand ();
	}

	vector<double>::pointer px1=3D &xvals[0];
	vector<double>::pointer px2=3D &yvals[0];

	long _curveId =3D insertCurve(QString(" "));
	if (_curveId =3D=3D 0 ) {
		printf ("No curve could be created...\n");
		return;
	}

	setCurveData (_curveId,px1,px2,100);
	setCurveStyle(_curveId, QwtCurve::Dots);
	QwtSymbol	sym;
	sym.setStyle(QwtSymbol::XCross);
	sym.setSize(1);
	setCurveSymbol(_curveId, sym);

	setFixedSize (150, 150);

	replot ();
	setAutoReplot(false);

}



MyHistWidget::MyHistWidget (QWidget *parent)
: QwtPlot (parent)
	{
	setMouseTracking (true);
	setTitle(QString(" "));
	setCanvasBackground(white);

	enableAxis (QwtPlot::xBottom , false);
	enableAxis (QwtPlot::yLeft , false);
	enableGridXMin (false);
	enableGridX (false);
	enableGridYMin (false);
	enableGridY (false);
	enableLegend (false);

	vector<double> xvals;
	vector<double> yvals;
	xvals.resize (100);
	yvals.resize (100);

	for (int i=3D0; i  < 100; i++) {
		xvals [i] =3D i;
		yvals [i] =3D rand ()*100;
	}

	vector<double>::pointer px1=3D &xvals[0];
	vector<double>::pointer px2 =3D &yvals[0];

	long _curveId =3D insertCurve(QString(" "));
	if (_curveId =3D=3D 0 ) {
		printf ("No curve could be created...\n");
		return;
	}

	setCurveData (_curveId, px1,px2,xvals.size ());
	setCurveStyle(_curveId, QwtCurve::Steps);

	QwtSymbol	sym;
	sym.setPen(black);
	sym.setStyle(QwtSymbol::XCross);
	sym.setSize(1);
	const QColor	&c =3D white;
	setCurveSymbol(_curveId, sym);

	setAxisAutoScale(QwtPlot::xBottom);
	setAxisAutoScale(QwtPlot::yLeft);
	setFixedSize (150, 150);

	replot ();
	setAutoReplot (false);
}

class MainWindow : public QMainWindow {
public:
		MainWindow (QWidget *parent =3D 0, const char *name =3D 0, WFlags fl =3D=
=20
WType_TopLevel);
};

MainWindow::MainWindow (QWidget *parent, const char *name, WFlags fl) :
	QMainWindow(parent, name, fl)
{
	QWidget *widget =3D new QWidget (this);
	setCentralWidget (widget);

	QTable *mytable =3D new QTable (9, 9,widget);

	for (int i =3D0; i < 8; i++) {
		mytable->setColumnWidth (i,150);
		mytable->setRowHeight (i, 150);
		for (int j =3D0; j < 8; j++) {
			MyScatterWidget *_widget =3D new MyScatterWidget (widget);
			mytable->setCellWidget(i,j, _widget);
			if (i!=3Dj)
				mytable->setCellWidget(j,i, _widget);
		}
	}
	mytable->setColumnWidth (8,150);
	mytable->setRowHeight (8, 150);
	for (int i=3D0; i < 8; i++) {
		MyHistWidget *_widget =3D new MyHistWidget (widget);
		mytable->setCellWidget (i,8,_widget);
		mytable->setCellWidget (8,i,_widget);
	}
	resize(QSize(739, 637).expandedTo(minimumSizeHint()));
}

int main( int argc, char ** argv )
{
     QApplication a( argc, argv );
=09
	/*~~~~~~~~~~~~~~~~~~~~~*/
	MainWindow *w =3D new MainWindow;
	/*~~~~~~~~~~~~~~~~~~~~~*/

	a.setMainWidget(w);
	w->show();

	/*~~~~~~~~~~~~~~~*/

	int res =3D a.exec();
	/*~~~~~~~~~~~~~~~*/

	delete w;

	return res;

}


Uwe Rathmann wrote:

> On Wednesday 25 February 2004 09:56, Sathya Krishnamurthy wrote:
>=20
>=20
>>The reason as I scroll to the 9th Row, the last 4 Steps plots start
>>violently flickering. In windows, if I drag the scrollbar back then the
>>flickering stops, but If I drag again to the end it flickers again. Thi=
s
>>is completely reproducable.
>=20
>=20
> Seems that there are recursive repaints.
>=20
> First thing you can try is: QwtPlot::setAutoReplot(FALSE);
>=20
> If this doesn=B4t help it is time to start the debugger: set a breakpoi=
nt in ...=20
> perhaps QwtPlot::drawCanvas and look at the stack.
>=20
> If you can=B4t figure out what is going on, try to isolate the problem =
to a=20
> small demo (X11, if possible) and send me the code.
>=20
> Uwe
>=20
>=20
>=20
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--=20

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