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examples/dials/SpeedoMeter.cpp

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+/*****************************************************************************
+ * Qwt Examples - Copyright (C) 2002 Uwe Rathmann
+ * This file may be used under the terms of the 3-clause BSD License
+ *****************************************************************************/
+
+#include "SpeedoMeter.h"
+
+#include <QwtDialNeedle>
+#include <QwtRoundScaleDraw>
+
+#include <QPainter>
+
+SpeedoMeter::SpeedoMeter( QWidget* parent )
+    : QwtDial( parent )
+    , m_label( "km/h" )
+{
+    QwtRoundScaleDraw* scaleDraw = new QwtRoundScaleDraw();
+    scaleDraw->setSpacing( 8 );
+    scaleDraw->enableComponent( QwtAbstractScaleDraw::Backbone, false );
+    scaleDraw->setTickLength( QwtScaleDiv::MinorTick, 0 );
+    scaleDraw->setTickLength( QwtScaleDiv::MediumTick, 4 );
+    scaleDraw->setTickLength( QwtScaleDiv::MajorTick, 8 );
+    setScaleDraw( scaleDraw );
+
+    setWrapping( false );
+    setReadOnly( true );
+
+    setOrigin( 135.0 );
+    setScaleArc( 0.0, 270.0 );
+
+    QwtDialSimpleNeedle* needle = new QwtDialSimpleNeedle(
+        QwtDialSimpleNeedle::Arrow, true, Qt::red,
+        QColor( Qt::gray ).lighter( 130 ) );
+    setNeedle( needle );
+}
+
+void SpeedoMeter::setLabel( const QString& label )
+{
+    m_label = label;
+    update();
+}
+
+QString SpeedoMeter::label() const
+{
+    return m_label;
+}
+
+void SpeedoMeter::drawScaleContents( QPainter* painter,
+    const QPointF& center, 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, m_label );
+}