Axis yLeft cuts of numbers

[d_stranz]

Hi Uwe,

OK, a little bigger example, with a custom QwtAxisScaleDraw for the yLeft axis. As you can see from the screenshot, the left side of most of the boxes is clippped.

What next?

Regards,
David

#include <QtGui/QApplication>
#include <QMainWindow>
#include <QPainter>
#include <QPen>
#include <qwt_plot.h>
#include <qwt_scale_draw.h>
#include <qwt_text.h>
#include <qwt_painter.h>
#include	<qwt_math.h>
 
#if QT_VERSION < 0x040000
#include <qwmatrix.h>
#define QwtMatrix QWMatrix
#else
#include <qmatrix.h>
#define QwtMatrix QMatrix
#endif
 
class MyScaleDraw
	:	public QwtScaleDraw
{
public:
	MyScaleDraw()	{}
 
protected:
	virtual void drawLabel( QPainter * painter, double value ) const
	{
		QwtText lbl = tickLabel(painter->font(), value);
		if ( lbl.isEmpty() )
			return; 
 
		lbl.setBackgroundPen( QPen( Qt::black ) );
		QPoint pos = labelPosition(value);
 
		QSize labelSize = lbl.textSize(painter->font());
		if ( labelSize.height() % 2 )
			labelSize.setHeight(labelSize.height() + 1);
 
		const QwtMetricsMap metricsMap = QwtPainter::metricsMap();
		QwtPainter::resetMetricsMap();
 
		labelSize = metricsMap.layoutToDevice(labelSize);
		pos = metricsMap.layoutToDevice(pos);
 
		const QwtMatrix m = labelMatrix( pos, labelSize);
 
		painter->save();
#if QT_VERSION < 0x040000
		painter->setWorldMatrix(m, true);
#else
		painter->setMatrix(m, true);
#endif
 
		lbl.draw (painter, QRect(QPoint(0, 0), labelSize) );
 
		QwtPainter::setMetricsMap(metricsMap); // restore metrics map
 
		painter->restore();
	}
 
private:
};
 
int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
 
	QwtPlot * pPlot = new QwtPlot;
	pPlot->setAxisScale( QwtPlot::yLeft, 0.0, 1.0e8, 5.0e6 );
	pPlot->setAxisScaleDraw( QwtPlot::yLeft, new MyScaleDraw() );
 
	QMainWindow w;
	w.setCentralWidget( pPlot );
	w.resize( 500, 500 );
	w.show();
	return a.exec();
}

#include <QtGui/QApplication>
#include <QMainWindow>
#include <QPainter>
#include <QPen>
#include <qwt_plot.h>
#include <qwt_scale_draw.h>
#include <qwt_text.h>
#include <qwt_painter.h>
#include	<qwt_math.h>

#if QT_VERSION < 0x040000
#include <qwmatrix.h>
#define QwtMatrix QWMatrix
#else
#include <qmatrix.h>
#define QwtMatrix QMatrix
#endif

class MyScaleDraw
	:	public QwtScaleDraw
{
public:
	MyScaleDraw()	{}

protected:
	virtual void drawLabel( QPainter * painter, double value ) const
	{
		QwtText lbl = tickLabel(painter->font(), value);
		if ( lbl.isEmpty() )
			return; 

		lbl.setBackgroundPen( QPen( Qt::black ) );
		QPoint pos = labelPosition(value);

		QSize labelSize = lbl.textSize(painter->font());
		if ( labelSize.height() % 2 )
			labelSize.setHeight(labelSize.height() + 1);

		const QwtMetricsMap metricsMap = QwtPainter::metricsMap();
		QwtPainter::resetMetricsMap();

		labelSize = metricsMap.layoutToDevice(labelSize);
		pos = metricsMap.layoutToDevice(pos);

		const QwtMatrix m = labelMatrix( pos, labelSize);

		painter->save();
#if QT_VERSION < 0x040000
		painter->setWorldMatrix(m, true);
#else
		painter->setMatrix(m, true);
#endif

		lbl.draw (painter, QRect(QPoint(0, 0), labelSize) );

		QwtPainter::setMetricsMap(metricsMap); // restore metrics map

		painter->restore();
	}

private:
};

int main(int argc, char *argv[])
{
	QApplication a(argc, argv);

	QwtPlot * pPlot = new QwtPlot;
	pPlot->setAxisScale( QwtPlot::yLeft, 0.0, 1.0e8, 5.0e6 );
	pPlot->setAxisScaleDraw( QwtPlot::yLeft, new MyScaleDraw() );

	QMainWindow w;
	w.setCentralWidget( pPlot );
	w.resize( 500, 500 );
	w.show();
	return a.exec();
}

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