Grid Minor Major and gap before the data

[huseyinkozan]

Hi,
This is the code in the constructor :

PlotWidget::PlotWidget(QWidget * parent, double * _ySession,
					   QString name, int rate, int numVis, int numSess) 
					   : QwtPlot(parent) {
	// data stuff....
 
	QwtPainter::setDeviceClipping(false);
	canvas()->setPaintAttribute(QwtPlotCanvas::PaintCached, true);
	canvas()->setPaintAttribute(QwtPlotCanvas::PaintPacked, true);
    //canvas()->setAttribute(Qt::WA_PaintOnScreen, true);
	canvas()->setFrameStyle(QFrame::Box | QFrame::Plain);
	canvas()->setLineWidth(1);
	canvas()->setMidLineWidth(0);
	setCanvasBackground(QColor(Qt::white));
	enableAxis(QwtPlot::xBottom, false);
	enableAxis(QwtPlot::yLeft, false);
	setMargin(0);
 
	setAxisScale(QwtPlot::xBottom,0.0, sizeLoop);
	setAxisScale(QwtPlot::yLeft,1500, 3000, 0 );
 
	setAxisMaxMajor(QwtPlot::yLeft, 8);
	setAxisMaxMinor(QwtPlot::yLeft, 5);
 
	QwtValueList vlist[3];
	for(double i=0;i<sizeLoop; i+=((sizeLoop-0)/13*5))
		vlist[0] << i;
	for(double i=0;i<sizeLoop; i+=((sizeLoop-0)/13))
		vlist[1] << i;
	for(double i=0;i<sizeLoop; i+=((sizeLoop-0)/13))
			vlist[2] << i;
	QwtScaleDiv scdiv(0, sizeLoop, vlist);
	setAxisScaleDiv(QwtPlot::xBottom, scdiv);
 
	// for inside margin (I think)
	axisScaleEngine(QwtPlot::xBottom)->setAttributes(QwtScaleEngine::Floating);
	axisScaleEngine(QwtPlot::xTop)->setAttributes(QwtScaleEngine::Floating);
	axisScaleEngine(QwtPlot::yLeft)->setAttributes(QwtScaleEngine::Floating);
	axisScaleEngine(QwtPlot::yRight)->setAttributes(QwtScaleEngine::Floating);
 
	curve = new QwtPlotCurve(name);
	//curve->setRenderHint(QwtPlotItem::RenderAntialiased);
	pen->setWidthF(penWidth + penWidthDiff);
	curve->setPen(*pen);
	curve->attach(this);
	curve->setRawData(xLoop, yLoop, sizeLoop);
 
	grid = new QwtPlotGrid;
	grid->enableXMin(true);
	grid->enableYMin(true);
	gridMinPen = new QPen(QColor(255, 230, 230), 0, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin);
	gridMajPen = new QPen(QColor(255, 200, 200), 0, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin);
	grid->setMajPen(*gridMajPen);
	grid->setMinPen(*gridMinPen);
	grid->attach(this);
}

PlotWidget::PlotWidget(QWidget * parent, double * _ySession,
					   QString name, int rate, int numVis, int numSess) 
					   : QwtPlot(parent) {
	// data stuff....

	QwtPainter::setDeviceClipping(false);
	canvas()->setPaintAttribute(QwtPlotCanvas::PaintCached, true);
	canvas()->setPaintAttribute(QwtPlotCanvas::PaintPacked, true);
    //canvas()->setAttribute(Qt::WA_PaintOnScreen, true);
	canvas()->setFrameStyle(QFrame::Box | QFrame::Plain);
	canvas()->setLineWidth(1);
	canvas()->setMidLineWidth(0);
	setCanvasBackground(QColor(Qt::white));
	enableAxis(QwtPlot::xBottom, false);
	enableAxis(QwtPlot::yLeft, false);
	setMargin(0);
	
	setAxisScale(QwtPlot::xBottom,0.0, sizeLoop);
	setAxisScale(QwtPlot::yLeft,1500, 3000, 0 );

	setAxisMaxMajor(QwtPlot::yLeft, 8);
	setAxisMaxMinor(QwtPlot::yLeft, 5);

	QwtValueList vlist[3];
	for(double i=0;i<sizeLoop; i+=((sizeLoop-0)/13*5))
		vlist[0] << i;
	for(double i=0;i<sizeLoop; i+=((sizeLoop-0)/13))
		vlist[1] << i;
	for(double i=0;i<sizeLoop; i+=((sizeLoop-0)/13))
			vlist[2] << i;
	QwtScaleDiv scdiv(0, sizeLoop, vlist);
	setAxisScaleDiv(QwtPlot::xBottom, scdiv);

	// for inside margin (I think)
	axisScaleEngine(QwtPlot::xBottom)->setAttributes(QwtScaleEngine::Floating);
	axisScaleEngine(QwtPlot::xTop)->setAttributes(QwtScaleEngine::Floating);
	axisScaleEngine(QwtPlot::yLeft)->setAttributes(QwtScaleEngine::Floating);
	axisScaleEngine(QwtPlot::yRight)->setAttributes(QwtScaleEngine::Floating);

	curve = new QwtPlotCurve(name);
	//curve->setRenderHint(QwtPlotItem::RenderAntialiased);
	pen->setWidthF(penWidth + penWidthDiff);
	curve->setPen(*pen);
	curve->attach(this);
	curve->setRawData(xLoop, yLoop, sizeLoop);

	grid = new QwtPlotGrid;
	grid->enableXMin(true);
	grid->enableYMin(true);
	gridMinPen = new QPen(QColor(255, 230, 230), 0, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin);
	gridMajPen = new QPen(QColor(255, 200, 200), 0, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin);
	grid->setMajPen(*gridMajPen);
	grid->setMinPen(*gridMinPen);
	grid->attach(this);
}

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And the code in the derived print filter :

QColor MyQwtPlotPrintFilter::color(const QColor &c, Item item) const {
    switch(item){
        case MajorGrid:
            return Qt::blue;
        case MinorGrid:
            return Qt::green;
        default:;
    }
    return c;
}

QColor MyQwtPlotPrintFilter::color(const QColor &c, Item item) const {
    switch(item){
        case MajorGrid:
            return Qt::blue;
        case MinorGrid:
            return Qt::green;
        default:;
    }
    return c;
}

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I got the exported pdf as attached "export.pdf". But I want to get "expected.png".
I added the colors to see the major and minor grids.

Now, the problem is :
1) I cannot see the minor grids at x axis.
2) I dont want a gap between the starting data and plot edge.

For 2'nd I found :
axisScaleEngine(QwtPlot::xBottom)->setAttributes(QwtScaleEngine::Floating);
but I couldn't realize what the QwtScaleEngine::Floating means (and other Attribute's)

Thanks for help.


Hüseyin