trusty (3) QwtRoundScaleDraw.3.gz

NAME

       QwtRoundScaleDraw -

       A class for drawing round scales.

SYNOPSIS

       #include <qwt_round_scale_draw.h>

       Inherits QwtAbstractScaleDraw.

       Inherited by QwtDialScaleDraw.

   Public Member Functions
       QwtRoundScaleDraw ()
       virtual ~QwtRoundScaleDraw ()
       void setRadius (int radius)
       int radius () const
       void moveCenter (double x, double y)
       void moveCenter (const QPointF &)
       QPointF center () const
       void setAngleRange (double angle1, double angle2)
       virtual double extent (const QFont &) const

   Protected Member Functions
       virtual void drawTick (QPainter *p, double val, double len) const
       virtual void drawBackbone (QPainter *p) const
       virtual void drawLabel (QPainter *p, double val) const

Detailed Description

       A class for drawing round scales.

       QwtRoundScaleDraw can be used to draw round scales. The circle segment can be adjusted by
       QwtRoundScaleDraw::setAngleRange(). The geometry of the scale can be specified with
       QwtRoundScaleDraw::moveCenter() and QwtRoundScaleDraw::setRadius().

       After a scale division has been specified as a QwtScaleDiv object using
       QwtAbstractScaleDraw::setScaleDiv(const QwtScaleDiv &s), the scale can be drawn with the
       QwtAbstractScaleDraw::draw() member.

Constructor & Destructor Documentation

   QwtRoundScaleDraw::QwtRoundScaleDraw ()
       Constructor. The range of the scale is initialized to [0, 100], The center is set to (50, 50) with a
       radius of 50. The angle range is set to [-135, 135].

   QwtRoundScaleDraw::~QwtRoundScaleDraw () [virtual]
       Destructor.

Member Function Documentation

   QPointF QwtRoundScaleDraw::center () const
       Get the center of the scale.

   void QwtRoundScaleDraw::drawBackbone (QPainter *painter) const [protected, virtual] Draws the baseline of the
       scale
       Parameters:
           painter Painter

       See also:
           drawTick(), drawLabel()

       Implements QwtAbstractScaleDraw.

   void QwtRoundScaleDraw::drawLabel (QPainter *painter, doublevalue) const [protected, virtual] Draws the label
       for a major scale tick
       Parameters:
           painter Painter
           value Value

       See also:
           drawTick(), drawBackbone()

       Implements QwtAbstractScaleDraw.

   void QwtRoundScaleDraw::drawTick (QPainter *painter, doublevalue, doublelen) const [protected, virtual] Draw
       a tick
       Parameters:
           painter Painter
           value Value of the tick
           len Lenght of the tick

       See also:
           drawBackbone(), drawLabel()

       Implements QwtAbstractScaleDraw.

   double QwtRoundScaleDraw::extent (const QFont &font) const [virtual] Calculate the extent of the scale
       The extent is the distance between the baseline to the outermost pixel of the scale draw. radius() +
       extent() is an upper limit for the radius of the bounding circle.

       Parameters:
           font Font used for painting the labels

       See also:
           setMinimumExtent(), minimumExtent()

       Warning:
           The implemented algo is not too smart and calculates only an upper limit, that might be a few pixels
           too large

       Implements QwtAbstractScaleDraw.

   void QwtRoundScaleDraw::moveCenter (doublex, doubley) [inline]
       Move the center of the scale draw, leaving the radius unchanged.

   void QwtRoundScaleDraw::moveCenter (const QPointF &center) Move the center of the scale draw, leaving the
       radius unchanged
       Parameters:
           center New center

       See also:
           setRadius()

   int QwtRoundScaleDraw::radius () const Get the radius
       Radius is the radius of the backbone without ticks and labels.

       See also:
           setRadius(), extent()

   void QwtRoundScaleDraw::setAngleRange (doubleangle1, doubleangle2)
       Adjust the baseline circle segment for round scales. The baseline will be drawn from min(angle1,angle2)
       to max(angle1, angle2). The default setting is [ -135, 135 ]. An angle of 0 degrees corresponds to the 12
       o'clock position, and positive angles count in a clockwise direction.

       Parameters:
           angle1
           angle2 boundaries of the angle interval in degrees.

       Warning:
           • The angle range is limited to [-360, 360] degrees. Angles exceeding this range will be clipped.
           • For angles more than 359 degrees above or below min(angle1, angle2), scale marks will not be drawn.
           • If you need a counterclockwise scale, use QwtScaleDiv::setRange
   void QwtRoundScaleDraw::setRadius (intradius) Change of radius the scale
       Radius is the radius of the backbone without ticks and labels.
       Parameters:
           radius New Radius
       See also:
           moveCenter()

Author

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