speedo_meter.cpp
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#include <qpainter.h>
#include <qwt_dial_needle.h>
#include "speedo_meter.h"
SpeedoMeter::SpeedoMeter(QWidget *parent):
QwtDial(parent),
d_label("km/h")
{
setWrapping(false);
setReadOnly(true);
setOrigin(135.0);
setScaleArc(0.0, 270.0);
scaleDraw()->setSpacing(8);
QwtDialSimpleNeedle *needle = new QwtDialSimpleNeedle(
QwtDialSimpleNeedle::Arrow, true, Qt::red,
QColor(Qt::gray).light(130));
setNeedle(needle);
setScaleComponents(
QwtAbstractScaleDraw::Ticks | QwtAbstractScaleDraw::Labels);
setScaleTicks(0, 4, 8);
}
void SpeedoMeter::setLabel(const QString &label)
{
d_label = label;
update();
}
QString SpeedoMeter::label() const
{
return d_label;
}
void SpeedoMeter::drawScaleContents(QPainter *painter,
const QPointF ¢er, double radius) const
{
QRectF rect( 0.0, 0.0, 2.0 * radius, 2.0 * radius - 10.0);
rect.moveCenter(center);
const QColor color = palette().color(QPalette::Text);
painter->setPen(color);
const int flags = Qt::AlignBottom | Qt::AlignHCenter;
painter->drawText(rect, flags, d_label);
}