10 #include "qwt_dial_needle.h" 
   13 #include <qapplication.h> 
   15 #include <qpainterpath.h> 
   18 static void qwtDrawStyle1Needle( QPainter* painter,
 
   19     const QPalette& palette, QPalette::ColorGroup colorGroup, qreal length )
 
   21     const qreal r[] = { 0.4, 0.3, 1, 0.8, 1, 0.3, 0.4 };
 
   22     const qreal a[] = { -45, -20, -15, 0, 15, 20, 45 };
 
   25     for ( 
int i = 0; i < 7; i++ )
 
   27         const qreal angle = a[i] / 180.0 * M_PI;
 
   28         const qreal radius = r[i] * length;
 
   30         const qreal x = radius * qFastCos( angle );
 
   31         const qreal y = radius * qFastSin( angle );
 
   36     painter->setPen( Qt::NoPen );
 
   37     painter->setBrush( palette.brush( colorGroup, QPalette::Light ) );
 
   38     painter->drawPath( path );
 
   41 static void qwtDrawStyle2Needle( QPainter* painter,
 
   42     const QPalette& palette, QPalette::ColorGroup colorGroup, qreal length )
 
   44     const qreal ratioX = 0.7;
 
   45     const qreal ratioY = 0.3;
 
   48     path1.lineTo( ratioX * length, 0.0 );
 
   49     path1.lineTo( length, ratioY * length );
 
   52     path2.lineTo( ratioX * length, 0.0 );
 
   53     path2.lineTo( length, -ratioY * length );
 
   55     painter->setPen( Qt::NoPen );
 
   57     painter->setBrush( palette.brush( colorGroup, QPalette::Light ) );
 
   58     painter->drawPath( path1 );
 
   60     painter->setBrush( palette.brush( colorGroup, QPalette::Dark ) );
 
   61     painter->drawPath( path2 );
 
   64 static void qwtDrawShadedPointer( QPainter* painter,
 
   65     const QColor& lightColor, 
const QColor& darkColor,
 
   66     qreal length, qreal width )
 
   68     const qreal peak = qwtMaxF( length / 10.0, 5.0 );
 
   70     const qreal knobWidth = width + 8;
 
   71     QRectF knobRect( 0, 0, knobWidth, knobWidth );
 
   72     knobRect.moveCenter( QPointF(0, 0) );
 
   75     path1.lineTo( 0.0, 0.5 * width );
 
   76     path1.lineTo( length - peak, 0.5 * width );
 
   77     path1.lineTo( length, 0.0 );
 
   78     path1.lineTo( 0.0, 0.0 );
 
   80     QPainterPath arcPath1;
 
   81     arcPath1.arcTo( knobRect, 0.0, -90.0 );
 
   83     path1 = path1.united( arcPath1 );
 
   86     path2.lineTo( 0.0, -0.5 * width );
 
   87     path2.lineTo( length - peak, -0.5 * width );
 
   88     path2.lineTo( length, 0.0 );
 
   89     path2.lineTo( 0.0, 0.0 );
 
   91     QPainterPath arcPath2;
 
   92     arcPath2.arcTo( knobRect, 0.0, 90.0 );
 
   94     path2 = path2.united( arcPath2 );
 
   96     painter->setPen( Qt::NoPen );
 
   98     painter->setBrush( lightColor );
 
   99     painter->drawPath( path1 );
 
  101     painter->setBrush( darkColor );
 
  102     painter->drawPath( path2 );
 
  105 static void qwtDrawArrowNeedle( QPainter* painter,
 
  106     const QPalette& palette, QPalette::ColorGroup colorGroup,
 
  107     qreal length, qreal width )
 
  110         width = qwtMaxF( length * 0.06, 9.0 );
 
  112     const qreal peak = qwtMaxF( 2.0, 0.4 * width );
 
  115     path.moveTo( 0.0, 0.5 * width );
 
  116     path.lineTo( length - peak, 0.3 * width );
 
  117     path.lineTo( length, 0.0 );
 
  118     path.lineTo( length - peak, -0.3 * width );
 
  119     path.lineTo( 0.0, -0.5 * width );
 
  121     QRectF br = path.boundingRect();
 
  123     QPalette pal( palette.color( QPalette::Mid ) );
 
  124     QColor c1 = pal.color( QPalette::Light );
 
  125     QColor c2 = pal.color( QPalette::Dark );
 
  127     QLinearGradient gradient( br.topLeft(), br.bottomLeft() );
 
  128     gradient.setColorAt( 0.0, c1 );
 
  129     gradient.setColorAt( 0.5, c1 );
 
  130     gradient.setColorAt( 0.5001, c2 );
 
  131     gradient.setColorAt( 1.0, c2 );
 
  133     QPen pen( gradient, 1 );
 
  134     pen.setJoinStyle( Qt::MiterJoin );
 
  136     painter->setPen( pen );
 
  137     painter->setBrush( palette.brush( colorGroup, QPalette::Mid ) );
 
  139     painter->drawPath( path );
 
  142 static void qwtDrawTriangleNeedle( QPainter* painter,
 
  143     const QPalette& palette, QPalette::ColorGroup colorGroup, qreal length )
 
  145     const qreal width = qRound( length / 3.0 );
 
  147     QPainterPath path[4];
 
  149     path[0].lineTo( length, 0.0 );
 
  150     path[0].lineTo( 0.0, width / 2 );
 
  152     path[1].lineTo( length, 0.0 );
 
  153     path[1].lineTo( 0.0, -width / 2 );
 
  155     path[2].lineTo( -length, 0.0 );
 
  156     path[2].lineTo( 0.0, width / 2 );
 
  158     path[3].lineTo( -length, 0.0 );
 
  159     path[3].lineTo( 0.0, -width / 2 );
 
  162     const int colorOffset = 10;
 
  163     const QColor darkColor = palette.color( colorGroup, QPalette::Dark );
 
  164     const QColor lightColor = palette.color( colorGroup, QPalette::Light );
 
  167     color[0] = darkColor.lighter( 100 + colorOffset );
 
  168     color[1] = darkColor.darker( 100 + colorOffset );
 
  169     color[2] = lightColor.lighter( 100 + colorOffset );
 
  170     color[3] = lightColor.darker( 100 + colorOffset );
 
  172     painter->setPen( Qt::NoPen );
 
  174     for ( 
int i = 0; i < 4; i++ )
 
  176         painter->setBrush( color[i] );
 
  177         painter->drawPath( path[i] );
 
  183     : m_palette( QApplication::palette() )
 
  220     const QPointF& center, 
double length, 
double direction,
 
  221     QPalette::ColorGroup colorGroup )
 const 
  225     painter->translate( center );
 
  226     painter->rotate( -direction );
 
  235     double width, 
const QBrush& brush, 
bool sunken )
 const 
  237     QPalette 
palette( brush.color() );
 
  239     QColor c1 = 
palette.color( QPalette::Light );
 
  240     QColor c2 = 
palette.color( QPalette::Dark );
 
  245     QRectF rect( 0.0, 0.0, width, width );
 
  246     rect.moveCenter( painter->combinedTransform().map( QPointF() ) );
 
  248     QLinearGradient gradient( rect.topLeft(), rect.bottomRight() );
 
  249     gradient.setColorAt( 0.0, c1 );
 
  250     gradient.setColorAt( 0.3, c1 );
 
  251     gradient.setColorAt( 0.7, c2 );
 
  252     gradient.setColorAt( 1.0, c2 );
 
  256     painter->resetTransform();
 
  258     painter->setPen( QPen( gradient, 1 ) );
 
  259     painter->setBrush( brush );
 
  260     painter->drawEllipse( rect );
 
  274     const QColor& mid, 
const QColor& base ):
 
  276     m_hasKnob( hasKnob ),
 
  280     palette.setColor( QPalette::Mid, mid );
 
  281     palette.setColor( QPalette::Base, base );
 
  313     double length, QPalette::ColorGroup colorGroup )
 const 
  315     qreal knobWidth = 0.0;
 
  316     qreal 
width = m_width;
 
  318     if ( m_style == 
Arrow )
 
  321             width = qwtMaxF( length * 0.06, 6.0 );
 
  323         qwtDrawArrowNeedle( painter,
 
  326         knobWidth = qwtMinF( 
width * 2.0, 0.2 * length );
 
  333         QPen pen ( 
palette().brush( colorGroup, QPalette::Mid ), 
width );
 
  334         pen.setCapStyle( Qt::FlatCap );
 
  336         painter->setPen( pen );
 
  337         painter->drawLine( QPointF( 0.0, 0.0 ), QPointF( length, 0.0 ) );
 
  339         knobWidth = qwtMaxF( 
width * 3.0, 5.0 );
 
  342     if ( m_hasKnob && knobWidth > 0.0 )
 
  345             palette().brush( colorGroup, QPalette::Base ), 
false );
 
  351     const QColor& light, 
const QColor& dark ):
 
  355     palette.setColor( QPalette::Light, light );
 
  356     palette.setColor( QPalette::Dark, dark );
 
  357     palette.setColor( QPalette::Base, Qt::gray );
 
  370     double length, QPalette::ColorGroup colorGroup )
 const 
  374         const qreal width = qwtMaxF( length / 6.0, 3.0 );
 
  376         const int colorOffset = 10;
 
  378         const QColor light = 
palette().color( colorGroup, QPalette::Light );
 
  379         const QColor dark = 
palette().color( colorGroup, QPalette::Dark );
 
  381         qwtDrawShadedPointer( painter,
 
  382             dark.lighter( 100 + colorOffset ),
 
  383             dark.darker( 100 + colorOffset ),
 
  386         painter->rotate( 180.0 );
 
  388         qwtDrawShadedPointer( painter,
 
  389             light.lighter( 100 + colorOffset ),
 
  390             light.darker( 100 + colorOffset ),
 
  393         const QBrush baseBrush = 
palette().brush( colorGroup, QPalette::Base );
 
  394         drawKnob( painter, width, baseBrush, 
true );
 
  398         qwtDrawTriangleNeedle( painter, 
palette(), colorGroup, length );
 
  410     const QColor& light, 
const QColor& dark ):
 
  414     palette.setColor( QPalette::Light, light );
 
  415     palette.setColor( QPalette::Dark, dark );
 
  428     double length, QPalette::ColorGroup colorGroup )
 const 
  431         qwtDrawStyle1Needle( painter, 
palette(), colorGroup, length );
 
  433         qwtDrawStyle2Needle( painter, 
palette(), colorGroup, length );
 
QwtCompassMagnetNeedle(Style=TriangleStyle, const QColor &light=Qt::white, const QColor &dark=Qt::red)
Constructor.
virtual void drawNeedle(QPainter *, double length, QPalette::ColorGroup) const override
Style
Style of the needle.
@ ThinStyle
A thin needle.
QwtCompassWindArrow(Style, const QColor &light=Qt::white, const QColor &dark=Qt::gray)
@ Style1
A needle pointing to the center.
virtual void drawNeedle(QPainter *, double length, QPalette::ColorGroup) const override
virtual void drawNeedle(QPainter *painter, double length, QPalette::ColorGroup colorGroup) const =0
Draw the needle.
virtual void drawKnob(QPainter *, double width, const QBrush &, bool sunken) const
Draw the knob.
virtual void draw(QPainter *, const QPointF ¢er, double length, double direction, QPalette::ColorGroup=QPalette::Active) const
virtual ~QwtDialNeedle()
Destructor.
const QPalette & palette() const
virtual void setPalette(const QPalette &)
QwtDialNeedle()
Constructor.
virtual void drawNeedle(QPainter *, double length, QPalette::ColorGroup) const override
QwtDialSimpleNeedle(Style, bool hasKnob=true, const QColor &mid=Qt::gray, const QColor &base=Qt::darkGray)
Style
Style of the needle.
void setWidth(double width)