QwtRoundScaleDraw(3)           Qwt User's Guide           QwtRoundScaleDraw(3)

NAME
       QwtRoundScaleDraw - A class for drawing round scales.


SYNOPSIS
       #include <qwt_round_scale_draw.h>

       Inherits QwtAbstractScaleDraw.

       Inherited by QwtCompassScaleDraw.

   Public Member Functions
       QwtRoundScaleDraw ()
           Constructor.
       virtual ~QwtRoundScaleDraw ()
           Destructor.
       void setRadius (double radius)
       double radius () const
       void moveCenter (double x, double y)
           Move the center of the scale draw, leaving the radius unchanged.
       void moveCenter (const QPointF &)
       QPointF center () const
           Get the center of the scale.
       void setAngleRange (double angle1, double angle2)
           Adjust the baseline circle segment for round scales.
       virtual double extent (const QFont &) const override

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

   Additional Inherited Members

Detailed Description
       A class for drawing round scales.

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

       Definition at line 31 of file qwt_round_scale_draw.h.

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].

       Definition at line 44 of file qwt_round_scale_draw.cpp.

Member Function Documentation
   void QwtRoundScaleDraw::drawBackbone (QPainter * painter) const [override],
       [protected],  [virtual]
       Draws the baseline of the scale

       Parameters
           painter Painter

       See also
           drawTick(), drawLabel()

       Implements QwtAbstractScaleDraw.

       Definition at line 224 of file qwt_round_scale_draw.cpp.

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

       Parameters
           painter Painter
           value Value

       See also
           drawTick(), drawBackbone()

       Implements QwtAbstractScaleDraw.

       Definition at line 145 of file qwt_round_scale_draw.cpp.

   void QwtRoundScaleDraw::drawTick (QPainter * painter, double value, double
       len) const [override],  [protected],  [virtual]
       Draw a tick

       Parameters
           painter Painter
           value Value of the tick
           len Length of the tick

       See also
           drawBackbone(), drawLabel()

       Implements QwtAbstractScaleDraw.

       Definition at line 190 of file qwt_round_scale_draw.cpp.

   double QwtRoundScaleDraw::extent (const QFont & font) const [override],
       [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

       Returns
           Calculated extent

       See also
           setMinimumExtent(), minimumExtent()

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

       Implements QwtAbstractScaleDraw.

       Definition at line 255 of file qwt_round_scale_draw.cpp.

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

       Parameters
           center New center

       See also
           setRadius()

       Definition at line 90 of file qwt_round_scale_draw.cpp.

   double QwtRoundScaleDraw::radius () const
       Get the radius

       Radius is the radius of the backbone without ticks and labels.

       Returns
           Radius of the scale

       See also
           setRadius(), extent()

       Definition at line 79 of file qwt_round_scale_draw.cpp.

   void QwtRoundScaleDraw::setAngleRange (double angle1, double angle2)
       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
           o The angle range is limited to [-360, 360] degrees. Angles
             exceeding this range will be clipped.
           o For angles more or equal than 360 degrees above or below
             min(angle1, angle2), scale marks will not be drawn.
           o If you need a counterclockwise scale, use
             QwtScaleDiv::setInterval()
       Definition at line 118 of file qwt_round_scale_draw.cpp.
   void QwtRoundScaleDraw::setRadius (double radius)
       Change of radius the scale
       Radius is the radius of the backbone without ticks and labels.
       Parameters
           radius New Radius
       See also
           moveCenter()
       Definition at line 66 of file qwt_round_scale_draw.cpp.

Author
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Version 6.2.0                   Sun Jul 18 2021           QwtRoundScaleDraw(3)