qwtabstractscaledraw(3)
NAME
QwtAbstractScaleDraw
SYNOPSIS
Inherited by QwtRoundScaleDraw, and QwtScaleDraw.
Detailed Description
A abstract base class for drawing scales.
QwtAbstractScaleDraw can be used to draw linear or logarithmic scales.
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 37 of file qwt_abstract_scale_draw.h.
- Public Types
- enum ScaleComponent { Backbone = 1, Ticks = 2, Labels = 4 }
- Public Member Functions
- QwtAbstractScaleDraw ()
QwtAbstractScaleDraw (const QwtAbstractScaleDraw &) virtual ~QwtAbstractScaleDraw () QwtAbstractScaleDraw & operator= (const QwtAbstractScaleDraw &) void setScaleDiv (const QwtScaleDiv &s) const QwtScaleDiv & scaleDiv () const void setTransformation (QwtScaleTransformation *) const QwtScaleMap & map () const
void enableComponent (ScaleComponent, bool enable=true) bool hasComponent (ScaleComponent) const void setTickLength (QwtScaleDiv::TickType, int length) int tickLength (QwtScaleDiv::TickType) const int majTickLength () const
void setSpacing (int margin)
int spacing () const
virtual void draw (QPainter *, const QPalette &) const
virtual QwtText label (double) const
virtual int extent (const QPen &, const QFont &) const=0
void setMinimumExtent (int)
int minimumExtent () const
QwtScaleMap & scaleMap () - Protected Member Functions
- virtual void drawTick (QPainter *painter, double value, int len)
const=0
- virtual void drawBackbone (QPainter *painter) const=0
virtual void drawLabel (QPainter *painter, double value) const=0
void invalidateCache ()
const QwtText & tickLabel (const QFont &, double value) const
Member Enumeration Documentation
- enum QwtAbstractScaleDraw::ScaleComponent
- Components of a scale
- · Backbone
- · Ticks
- · Labels
- See also:
QwtAbstractScaleDraw::enableComponent, QwtAbstractScaleDraw::hasComponent
- Definition at line 52 of file qwt_abstract_scale_draw.h.
Constructor & Destructor Documentation
- QwtAbstractScaleDraw::QwtAbstractScaleDraw ()
- Constructor.
- The range of the scale is initialized to [0, 100], The spacing
(distance between ticks and labels) is set to 4, the tick lengths are
set to 4,6 and 8 pixels - Definition at line 55 of file qwt_abstract_scale_draw.cpp.
- QwtAbstractScaleDraw::QwtAbstractScaleDraw (const QwtAbstractScaleDraw &)
- Copy constructor.
- Definition at line 61 of file qwt_abstract_scale_draw.cpp.
- References d_data.
- QwtAbstractScaleDraw::~QwtAbstractScaleDraw () [virtual]
- Destructor.
- Definition at line 67 of file qwt_abstract_scale_draw.cpp.
Member Function Documentation
- QwtAbstractScaleDraw & QwtAbstractScaleDraw::operator= (const
- QwtAbstractScaleDraw &)
Assignment operator. - Definition at line 72 of file qwt_abstract_scale_draw.cpp.
- References d_data.
- void QwtAbstractScaleDraw::setScaleDiv (const QwtScaleDiv & sd)
- Change the scale division
- Parameters:
sd New scale division
- Definition at line 108 of file qwt_abstract_scale_draw.cpp.
- References QwtScaleDiv::hBound(), and QwtScaleDiv::lBound().
- Referenced by QwtAbstractScale::setAbstractScaleDraw(),
QwtScaleWidget::setScaleDiv(), and QwtPlotScaleItem::updateScaleDiv(). - const QwtScaleDiv & QwtAbstractScaleDraw::scaleDiv () const
- Returns:
scale division
- Definition at line 138 of file qwt_abstract_scale_draw.cpp.
- Referenced by QwtRoundScaleDraw::extent(),
QwtScaleDraw::getBorderDistHint(), QwtScaleDraw::maxLabelHeight(),
QwtScaleDraw::maxLabelWidth(), QwtScaleDraw::minLabelDist(),
QwtScaleDraw::minLength(), QwtScaleWidget::setScaleDiv(), and
QwtPlot::sizeHint(). - void QwtAbstractScaleDraw::setTransformation (QwtScaleTransformation *
- transformation)
Change the transformation of the scale - Parameters:
transformation New scale transformation
- Definition at line 119 of file qwt_abstract_scale_draw.cpp.
- Referenced by QwtPlotScaleItem::draw(), and
QwtScaleWidget::setScaleDiv(). - const QwtScaleMap & QwtAbstractScaleDraw::map () const
- Returns:
Map how to translate between scale and pixel values
- Definition at line 126 of file qwt_abstract_scale_draw.cpp.
- Referenced by QwtRoundScaleDraw::drawBackbone(),
QwtScaleWidget::drawColorBar(), QwtRoundScaleDraw::drawLabel(),
QwtScaleDraw::drawTick(), QwtRoundScaleDraw::drawTick(),
QwtRoundScaleDraw::extent(), QwtScaleDraw::getBorderDistHint(),
QwtScaleDraw::labelPosition(), and QwtScaleWidget::setScaleDiv(). - void QwtAbstractScaleDraw::enableComponent (ScaleComponent component, bool
- enable = true)
En/Disable a component of the scale - Parameters:
component Scale component
enable On/Off - See also:
QwtAbstractScaleDraw::hasComponent
- Definition at line 86 of file qwt_abstract_scale_draw.cpp.
- Referenced by QwtDial::setScaleOptions().
- bool QwtAbstractScaleDraw::hasComponent (ScaleComponent component) const
- Check if a component is enabled
- See also:
QwtAbstractScaleDraw::enableComponent
- Definition at line 99 of file qwt_abstract_scale_draw.cpp.
- Referenced by QwtRoundScaleDraw::drawLabel(), QwtScaleDraw::extent(),
QwtRoundScaleDraw::extent(), QwtScaleDraw::getBorderDistHint(),
QwtScaleDraw::labelPosition(), QwtScaleDraw::minLabelDist(), and
QwtScaleDraw::minLength(). - void QwtAbstractScaleDraw::setTickLength (QwtScaleDiv::TickType tickType,
- int length)
Set the length of the ticks - Parameters:
tickType Tick type
length New length - Warning:
the length is limited to [0..1000]
- Definition at line 306 of file qwt_abstract_scale_draw.cpp.
- Referenced by QwtDial::setScaleTicks().
- int QwtAbstractScaleDraw::tickLength (QwtScaleDiv::TickType tickType) const
- Return the length of the ticks
- See also:
QwtAbstractScaleDraw::setTickLength, QwtAbstractScaleDraw::majTickLength
- Definition at line 331 of file qwt_abstract_scale_draw.cpp.
- int QwtAbstractScaleDraw::majTickLength () const
- The same as QwtAbstractScaleDraw::tickLength(QwtScaleDiv::MajorTick).
- Definition at line 345 of file qwt_abstract_scale_draw.cpp.
- Referenced by QwtRoundScaleDraw::drawLabel(), QwtScaleDraw::extent(),
QwtRoundScaleDraw::extent(), and QwtScaleDraw::labelPosition(). - void QwtAbstractScaleDraw::setSpacing (int spacing)
- Set the spacing between tick and labels.
- The spacing is the distance between ticks and labels. The default
spacing is 4 pixels. - Parameters:
spacing Spacing
- See also:
QwtAbstractScaleDraw::spacing
- Definition at line 247 of file qwt_abstract_scale_draw.cpp.
- int QwtAbstractScaleDraw::spacing () const
- Get the spacing.
- The spacing is the distance between ticks and labels. The default
spacing is 4 pixels. - See also:
QwtAbstractScaleDraw::setSpacing
- Definition at line 263 of file qwt_abstract_scale_draw.cpp.
- Referenced by QwtRoundScaleDraw::drawLabel(), QwtScaleDraw::extent(),
QwtRoundScaleDraw::extent(), and QwtScaleDraw::labelPosition(). - void QwtAbstractScaleDraw::draw (QPainter * painter, const QPalette &
- palette) const [virtual]
Draw the scale. - Parameters:
painter The painter
palette Palette, text color is used for the labels, foreground color for ticks and backbone - Definition at line 165 of file qwt_abstract_scale_draw.cpp.
- Referenced by QwtThermo::draw(), QwtSlider::draw(),
QwtPlotScaleItem::draw(), QwtKnob::draw(), and QwtPlot::printScale(). - QwtText QwtAbstractScaleDraw::label (double value) const [virtual]
- Convert a value into its representing label.
- The value is converted to a plain text using
QLocale::system().toString(value). This method is often overloaded by
applications to have individual labels. - Parameters:
value Value
- Returns:
Label string.
- Reimplemented in QwtDialScaleDraw.
- Definition at line 361 of file qwt_abstract_scale_draw.cpp.
- Referenced by QwtRoundScaleDraw::drawLabel(),
QwtRoundScaleDraw::extent(), QwtDialScaleDraw::label(), and
tickLabel(). - virtual int QwtAbstractScaleDraw::extent (const QPen &, const QFont &)
- const [pure virtual]
Calculate the extent - The extent is the distcance from the baseline to the outermost pixel of
the scale draw in opposite to its orientation. It is at least
minimumExtent() pixels. - See also:
setMinimumExtent(), minimumExtent()
- Implemented in QwtRoundScaleDraw, and QwtScaleDraw.
- void QwtAbstractScaleDraw::setMinimumExtent (int minExtent)
- Set a minimum for the extent.
- The extent is calculated from the coomponents of the scale draw. In
situations, where the labels are changing and the layout depends on the extent (f.e scrolling a scale), setting an upper limit as minimum
extent will avoid jumps of the layout. - Parameters:
minExtent Minimum extent
- See also:
extent(), minimumExtent()
- Definition at line 281 of file qwt_abstract_scale_draw.cpp.
- int QwtAbstractScaleDraw::minimumExtent () const
- Get the minimum extent
- See also:
extent(), setMinimumExtent()
- Definition at line 293 of file qwt_abstract_scale_draw.cpp.
- Referenced by QwtScaleDraw::extent(), and QwtRoundScaleDraw::extent().
- QwtScaleMap & QwtAbstractScaleDraw::scaleMap ()
- Returns:
Map how to translate between scale and pixel values
- Definition at line 132 of file qwt_abstract_scale_draw.cpp.
- Referenced by QwtScaleDraw::drawTick(),
QwtRoundScaleDraw::QwtRoundScaleDraw(), and
QwtRoundScaleDraw::setAngleRange(). - virtual void QwtAbstractScaleDraw::drawTick (QPainter * painter, double
- value, int len) const [protected, pure virtual] Draw a tick
- Parameters:
painter Painter
value Value of the tick
len Lenght of the tick - See also:
drawBackbone(), drawLabel()
- Implemented in QwtRoundScaleDraw, and QwtScaleDraw.
- virtual void QwtAbstractScaleDraw::drawBackbone (QPainter * painter) const
- [protected, pure virtual] Draws the baseline of the scale
- Parameters:
painter Painter
- See also:
drawTick(), drawLabel()
- Implemented in QwtRoundScaleDraw, and QwtScaleDraw.
- virtual void QwtAbstractScaleDraw::drawLabel (QPainter * painter, double
- value) const [protected, pure virtual] Draws the label for a major scale tick
- Parameters:
painter Painter
value Value - See also:
drawTick, drawBackbone
- Implemented in QwtRoundScaleDraw, and QwtScaleDraw.
- void QwtAbstractScaleDraw::invalidateCache () [protected]
- Invalidate the cache used by QwtAbstractScaleDraw::tickLabel
- The cache is invalidated, when a new QwtScaleDiv is set. If the labels need to be changed. while the same QwtScaleDiv is set, QwtAbstractScaleDraw::invalidateCache needs to be called manually.
- Definition at line 404 of file qwt_abstract_scale_draw.cpp.
- const QwtText & QwtAbstractScaleDraw::tickLabel (const QFont & font, double
- value) const [protected]
Convert a value into its representing label and cache it. - The conversion between value and label is called very often in the
layout and painting code. Unfortunately the calculation of the label
sizes might be slow (really slow for rich text in Qt4), so it's
necessary to cache the labels. - Parameters:
font Font
value Value - Returns:
Tick label
- Definition at line 379 of file qwt_abstract_scale_draw.cpp.
- References label(), and QwtText::setRenderFlags().
- Referenced by QwtScaleDraw::boundingLabelRect(),
QwtScaleDraw::drawLabel(), QwtRoundScaleDraw::drawLabel(),
QwtRoundScaleDraw::extent(), and QwtScaleDraw::labelRect().
Author
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code.