QwtPlotScaleItem(3) Qwt User's Guide QwtPlotScaleItem(3)NAMEQwtPlotScaleItem-
SYNOPSIS
#include <qwt_plot_scaleitem.h>
Inherits QwtPlotItem.
Public Member Functions
QwtPlotScaleItem (QwtScaleDraw::Alignment=QwtScaleDraw::BottomScale,
const double pos=0.0)
virtual ~QwtPlotScaleItem ()
int borderDistance () const
virtual void draw (QPainter *p, const QwtScaleMap &xMap, const
QwtScaleMap &yMap, const QRect &rect) const
QFont font () const
bool isScaleDivFromAxis () const
QPalette palette () const
double position () const
virtual int rtti () const
const QwtScaleDiv & scaleDiv () const
const QwtScaleDraw * scaleDraw () const
QwtScaleDraw * scaleDraw ()
void setAlignment (QwtScaleDraw::Alignment)
void setBorderDistance (int numPixels)
void setFont (const QFont &)
void setPalette (const QPalette &)
void setPosition (double pos)
void setScaleDiv (const QwtScaleDiv &)
void setScaleDivFromAxis (bool on)
void setScaleDraw (QwtScaleDraw *)
virtual void updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &)
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::Alignmentalignment =
QwtScaleDraw::BottomScale, const doublepos = 0.0) [explicit]
Constructor for scale item at the position pos. Parameters:
alignment In case of
QwtScaleDraw::BottomScale/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::Alignmentalignment)
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 (intdistance)
Align the scale to the canvas. If distance is >= 0 the scale will be
aligned to a border of the contents rect 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 (doublepos)
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 (boolon)
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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Version 5.2.3 Tue Nov 20 2012 QwtPlotScaleItem(3)
