Grid Minor Major and gap before the data

Hi,
This is the code in the constructor :

Code:

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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 :

Code:

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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

Quote:

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Originally Posted by huseyinkozan

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.

---

1) Are there any minor ticks in your bottom scale ?
2) plot->plotLayout()->setAlignCanvasToScales(true);

Uwe

Quote:

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Originally Posted by Uwe

1) Are there any minor ticks in your bottom scale ?
2) plot->plotLayout()->setAlignCanvasToScales(true);

Uwe

---

1) I found the QwtValueList model here : http://thread.gmane.org/gmane.comp.g...t.general/1425
Does this not assign the minor, medium and major ticks ?

2) I have added the code and plotLayout()->setCanvasMargin(...) it works.

Thanks.


Hüseyin

Note: I am using 5.1.2-svn, Qt 4.5 with msvc addin. And the code is here:

Code:

---

PlotWidget::PlotWidget(QWidget * parent, double * _ySession,
					   QString name, int rate, int numVis, int numSess) 
					   : QwtPlot(parent)
{
	setAutoReplot(false);
	sampRate = rate;
	plotName = name;
	sizeLoop = numVis;
	sizeVisible = numVis;
	sizeSession = numSess;
	scrollModeOn = false;
	clearPlot = false;
	indexLoop = 0;
	sessionScrollIndex = 0;
	pageDiv = 50;
	xLoop = new double[sizeLoop];
	yLoop = new double[sizeLoop];
	ySession = _ySession;
	pen = new QPen(Qt::black);
	penWidth = 1.0;
	penWidthDiff = 0.5;
	gridMinPenWidth = 1.0;
	gridMajPenWidth = 1.0;
	for (int i = 0; i < sizeLoop; i++){
		xLoop[i] = i;
		yLoop[i] = 0.0;
	}
 
	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);
	scdiv.setTicks(QwtScaleDiv::MinorTick, vlist[1]);
	setAxisScaleDiv(QwtPlot::xBottom, scdiv);
 
	// for inside margin
	plotLayout()->setAlignCanvasToScales(true);
	plotLayout()->setCanvasMargin(0,QwtPlot::xBottom);
	plotLayout()->setCanvasMargin(0,QwtPlot::xTop);
	plotLayout()->setCanvasMargin(0,QwtPlot::yLeft);
	plotLayout()->setCanvasMargin(0,QwtPlot::yRight);
 
	curve = new QwtPlotCurve(plotName);
	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);
 
	labelMarker = new QwtPlotMarker;
	labelMarker->setValue(QwtDoublePoint(50, 2900));
	QwtText text(plotName);
	text.setFont(QFont("Verdana", 10, QFont::Bold));
	text.setColor(QColor(180,180,180));
	text.setRenderFlags(Qt::AlignLeft);
	labelMarker->setLabel(text);
	labelMarker->attach(this);
}

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Hi,

I don't want any spacing between the scale backbone and the canvas (plotting area). Thus, the backbones of the left and bottom axes should be "connected". I tried the following without success (there is a 1 or 2 pixels gap):

Code:

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plotLayout()->setAlignCanvasToScales(true);
plotLayout()->setCanvasMargin(0, QwtPlot::xBottom);
plotLayout()->setCanvasMargin(0, QwtPlot::xTop);
plotLayout()->setCanvasMargin(0, QwtPlot::yLeft);
plotLayout()->setCanvasMargin(0, QwtPlot::yRight);
plotLayout()->setSpacing(0);
plotLayout()->setMargin(0);

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Any hints?