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VisCSCPlotWidgetAxisX.cc

Go to the documentation of this file.

#include "VisReco/VisMuonCSC/interface/VisCSCPlotWidgetAxisX.h"
#include "qpainter.h"
#include <cassert>
#include <cmath>
#include <iostream>

VisCSCPlotWidgetAxisX::VisCSCPlotWidgetAxisX(const int nbins, QWidget* parent, const char* name): QWidget(parent, name), 
m_bins(nbins)
{
        assert(m_bins>0);
}

VisCSCPlotWidgetAxisX::~VisCSCPlotWidgetAxisX(void)
{
}
QSize VisCSCPlotWidgetAxisX::minimumSizeHint() const
{
        // minimumSizeHint/sizeHint must be coordinated with y axis/VisCSCPlotWidget 
        return QSize( 80, 40 );
}
QSize VisCSCPlotWidgetAxisX::sizeHint() const
{
        return QSize( 400, 50 );
}
void VisCSCPlotWidgetAxisX::paintEvent(QPaintEvent *)
{
        QPainter painter(this);
        painter.setPen(Qt::blue);
        QFont sansFont( "Helvetica", 9 );
        painter.setFont( sansFont );
        QFontMetrics fm( sansFont );

        // assume every five bins is a good choice: change to 16 for CSC
        const int bin_spacing = 16;
        QPointArray scale( 4 * int(floor(float(m_bins) / bin_spacing)) );
        int yoffset = 2;
        int tickHeight = 4;

        // don't forget that the last pixel is width()-1
        for (int i = bin_spacing, j = 0; i <= m_bins; i += bin_spacing )
        {
                // labels go under center of bin before tick marks
                QString label = QString("%1").arg(i);
                int labelWidth = fm.width(label);
                int xtext = int(floor( (i - 0.5F)*width()/m_bins - labelWidth/2.F + 0.5F) );
                // check to see last label doesn't stick over the edge
                if (xtext > width()-1 - fm.width(label))
                {
                        xtext = width()-1 - fm.width(label);
                }
                painter.drawText( xtext, fm.height(), label );
                // draw tick marks
                scale.setPoint(j++, int(float(i - bin_spacing)*(width()-1)/m_bins + 0.5F), yoffset+tickHeight );
                scale.setPoint(j++, int(float(i - bin_spacing)*(width()-1)/m_bins + 0.5F), yoffset );
                scale.setPoint(j++, int(float(i              )*(width()-1)/m_bins + 0.5F), yoffset );
                scale.setPoint(j++, int(float(i              )*(width()-1)/m_bins + 0.5F), yoffset+tickHeight );
        }       
        painter.drawPolyline(scale);
}

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