NAME

       QwtPlotScaleItem - A class which draws a scale inside the plot canvas.

SYNOPSIS

       #include <qwt_plot_scaleitem.h>

       Inherits QwtPlotItem.

   Public Member Functions
       QwtPlotScaleItem (QwtScaleDraw::Alignment=QwtScaleDraw::BottomScale, const double pos=0.0)
           Constructor for scale item at the position pos.
       virtual ~QwtPlotScaleItem ()
           Destructor.
       virtual int rtti () const
       void setScaleDiv (const QwtScaleDiv &)
           Assign a scale division.
       const QwtScaleDiv & scaleDiv () const
       void setScaleDivFromAxis (bool on)
       bool isScaleDivFromAxis () const
       void setPalette (const QPalette &)
       QPalette palette () const
       void setFont (const QFont &)
       QFont font () const
       void setScaleDraw (QwtScaleDraw *)
           Set a scale draw.
       const QwtScaleDraw * scaleDraw () const
       QwtScaleDraw * scaleDraw ()
       void setPosition (double pos)
       double position () const
       void setBorderDistance (int)
           Align the scale to the canvas.
       int borderDistance () const
       void setAlignment (QwtScaleDraw::Alignment)
       virtual void draw (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const
           QRectF &canvasRect) const
           Draw the scale.
       virtual void updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &)
           Update the item to changes of the axes scale division.

   Additional Inherited Members

Detailed Description

       A class which draws a scale inside the plot canvas.

       QwtPlotScaleItem can be used to draw an axis inside the plot canvas. It might by
       synchronized to one of the axis of the plot, but can also display its own ticks and
       labels.

       It is allowed to synchronize the scale item with a disabled axis. In plots with vertical
       and horizontal scale items, it might be necessary to remove ticks at the intersections, by
       overloading updateScaleDiv().

       The scale might be at a specific position (f.e 0.0) or it might be aligned to a canvas
       border.

       Example
           The following example shows how to replace the left axis, by a scale item at the x
           position 0.0.

           QwtPlotScaleItem *scaleItem = new QwtPlotScaleItem( QwtScaleDraw::RightScale, 0.0 );
           scaleItem->setFont( plot->axisWidget( QwtPlot::yLeft )->font() );
           scaleItem->attach(plot);

           plot->enableAxis( QwtPlot::yLeft, false );

Constructor & Destructor Documentation

   QwtPlotScaleItem::QwtPlotScaleItem (QwtScaleDraw::Alignment alignment =
       QwtScaleDraw::BottomScale, const double pos = 0.0) [explicit]
       Constructor for scale item at the position pos.

       Parameters:
           alignment In case of QwtScaleDraw::BottomScale or QwtScaleDraw::TopScale the scale
           item is corresponding to the xAxis(), otherwise it corresponds to the yAxis().
           pos x or y position, depending on the corresponding axis.

       See also:
           setPosition(), setAlignment()

Member Function Documentation

   int QwtPlotScaleItem::borderDistance () const
       Returns:
           Distance from a canvas border

       See also:
           setBorderDistance(), setPosition()

   QFont QwtPlotScaleItem::font () const
       Returns:
           tick label font

       See also:
           setFont()

   bool QwtPlotScaleItem::isScaleDivFromAxis () const
       Returns:
           True, if the synchronization of the scale division with the corresponding axis is
           enabled.

       See also:
           setScaleDiv(), setScaleDivFromAxis()

   QPalette QwtPlotScaleItem::palette () const
       Returns:
           palette

       See also:
           setPalette()

   double QwtPlotScaleItem::position () const
       Returns:
           Position of the scale

       See also:
           setPosition(), setAlignment()

   int QwtPlotScaleItem::rtti () const [virtual]
       Returns:
           QwtPlotItem::Rtti_PlotScale

       Reimplemented from QwtPlotItem.

   const QwtScaleDiv & QwtPlotScaleItem::scaleDiv () const
       Returns:
           Scale division

   const QwtScaleDraw * QwtPlotScaleItem::scaleDraw () const
       Returns:
           Scale draw

       See also:
           setScaleDraw()

   QwtScaleDraw * QwtPlotScaleItem::scaleDraw ()
       Returns:
           Scale draw

       See also:
           setScaleDraw()

   void QwtPlotScaleItem::setAlignment (QwtScaleDraw::Alignment alignment)
       Change the alignment of the scale

       The alignment sets the orientation of the scale and the position of the ticks:

       • QwtScaleDraw::BottomScale: horizontal, ticks below

       • QwtScaleDraw::TopScale: horizontal, ticks above

       • QwtScaleDraw::LeftScale: vertical, ticks left

       • QwtScaleDraw::RightScale: vertical, ticks right

       For horizontal scales the position corresponds to QwtPlotItem::yAxis(), otherwise to
       QwtPlotItem::xAxis().

       See also:
           scaleDraw(), QwtScaleDraw::alignment(), setPosition()

   void QwtPlotScaleItem::setBorderDistance (int distance)
       Align the scale to the canvas. If distance is >= 0 the scale will be aligned to a border
       of the contents rectangle of the canvas. If alignment() is QwtScaleDraw::LeftScale, the
       scale will be aligned to the right border, if it is QwtScaleDraw::TopScale it will be
       aligned to the bottom (and vice versa),

       If distance is < 0 the scale will be at the position().

       Parameters:
           distance Number of pixels between the canvas border and the backbone of the scale.

       See also:
           setPosition(), borderDistance()

   void QwtPlotScaleItem::setFont (const QFont & font)
       Change the tick label font

       See also:
           font()

   void QwtPlotScaleItem::setPalette (const QPalette & palette)
       Set the palette

       See also:
           QwtAbstractScaleDraw::draw(), palette()

   void QwtPlotScaleItem::setPosition (double pos)
       Change the position of the scale

       The position is interpreted as y value for horizontal axes and as x value for vertical
       axes.

       The border distance is set to -1.

       Parameters:
           pos New position

       See also:
           position(), setAlignment()

   void QwtPlotScaleItem::setScaleDiv (const QwtScaleDiv & scaleDiv)
       Assign a scale division. When assigning a scaleDiv the scale division won't be
       synchronized with the corresponding axis anymore.

       Parameters:
           scaleDiv Scale division

       See also:
           scaleDiv(), setScaleDivFromAxis(), isScaleDivFromAxis()

   void QwtPlotScaleItem::setScaleDivFromAxis (bool on)
       Enable/Disable the synchronization of the scale division with the corresponding axis.

       Parameters:
           on true/false

       See also:
           isScaleDivFromAxis()

   void QwtPlotScaleItem::setScaleDraw (QwtScaleDraw * scaleDraw)
       Set a scale draw.

       Parameters:
           scaleDraw object responsible for drawing scales.

       The main use case for replacing the default QwtScaleDraw is to overload
       QwtAbstractScaleDraw::label, to replace or swallow tick labels.

       See also:
           scaleDraw()

   void QwtPlotScaleItem::updateScaleDiv (const QwtScaleDiv & xScaleDiv, const QwtScaleDiv &
       yScaleDiv) [virtual]
       Update the item to changes of the axes scale division. In case of isScaleDivFromAxis(),
       the scale draw is synchronized to the correspond axis.

       Parameters:
           xScaleDiv Scale division of the x-axis
           yScaleDiv Scale division of the y-axis

       See also:
           QwtPlot::updateAxes()

       Reimplemented from QwtPlotItem.

Author

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