trusty (3) QwtPlotScaleItem.3.gz
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)
virtual ~QwtPlotScaleItem ()
virtual int rtti () const
void setScaleDiv (const QwtScaleDiv &)
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 *)
const QwtScaleDraw * scaleDraw () const
QwtScaleDraw * scaleDraw ()
void setPosition (double pos)
double position () const
void setBorderDistance (int numPixels)
int borderDistance () const
void setAlignment (QwtScaleDraw::Alignment)
virtual void draw (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &rect)
const
virtual void updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &)
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 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()
QwtPlotScaleItem::~QwtPlotScaleItem () [virtual]
Destructor.
Member Function Documentation
int QwtPlotScaleItem::borderDistance () const Returns:
Distance from a canvas border
See also:
setBorderDistance(), setPosition()
void QwtPlotScaleItem::draw (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF
&rect) const [virtual]
Draw the scale.
Implements QwtPlotItem.
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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