QwtDialScaleDraw(3) Qwt User's Guide QwtDialScaleDraw(3)NAMEQwtDialScaleDraw-
A special scale draw made for QwtDial.
SYNOPSIS
#include <qwt_dial.h>
Inherits QwtRoundScaleDraw.
Public Types
enum ScaleComponent { Backbone = 1, Ticks = 2, Labels = 4 }
Public Member Functions
QPoint center () const
virtual void draw (QPainter *, const QPalette &) const
void enableComponent (ScaleComponent, bool enable=true)
virtual int extent (const QPen &, const QFont &) const
bool hasComponent (ScaleComponent) const
virtual QwtText label (double value) const
int majTickLength () const
const QwtScaleMap & map () const
int minimumExtent () const
void moveCenter (const QPoint &)
void moveCenter (int x, int y)
uint penWidth () const
QwtDialScaleDraw (QwtDial *)
int radius () const
const QwtScaleDiv & scaleDiv () const
QwtScaleMap & scaleMap ()
void setAngleRange (double angle1, double angle2)
void setMinimumExtent (int)
void setPenWidth (uint)
void setRadius (int radius)
void setScaleDiv (const QwtScaleDiv &s)
void setSpacing (int margin)
void setTickLength (QwtScaleDiv::TickType, int length)
void setTransformation (QwtScaleTransformation *)
int spacing () const
int tickLength (QwtScaleDiv::TickType) const
Protected Member Functions
virtual void drawBackbone (QPainter *p) const
virtual void drawLabel (QPainter *p, double val) const
virtual void drawTick (QPainter *p, double val, int len) const
void invalidateCache ()
const QwtText & tickLabel (const QFont &, double value) const
Detailed Description
A special scale draw made for QwtDial.
See also:
QwtDial, QwtCompass
Member Enumeration Documentation
enum QwtAbstractScaleDraw::ScaleComponent [inherited] Components of a scale
· Backbone
· Ticks
· Labels
See also:
enableComponent(), hasComponent
Constructor & Destructor Documentation
QwtDialScaleDraw::QwtDialScaleDraw (QwtDial *parent) [explicit] Constructor
Parameters:
parent Parent dial widget
Member Function Documentation
QPoint QwtRoundScaleDraw::center () const [inherited]
Get the center of the scale.
void QwtAbstractScaleDraw::draw (QPainter *painter, const QPalette
&palette) const [virtual, inherited]
Draw the scale. Parameters:
painter The painter
palette Palette, text color is used for the labels, foreground
color for ticks and backbone
void QwtRoundScaleDraw::drawBackbone (QPainter *painter) const [protected,
virtual, inherited] Draws the baseline of the scale
Parameters:
painter Painter
See also:
drawTick(), drawLabel()
Implements QwtAbstractScaleDraw.
void QwtRoundScaleDraw::drawLabel (QPainter *painter, doublevalue) const
[protected, virtual, inherited] Draws the label for a major scale tick
Parameters:
painter Painter
value Value
See also:
drawTick(), drawBackbone()
Implements QwtAbstractScaleDraw.
void QwtRoundScaleDraw::drawTick (QPainter *painter, doublevalue, intlen)
const [protected, virtual, inherited] Draw a tick
Parameters:
painter Painter
value Value of the tick
len Lenght of the tick
See also:
drawBackbone(), drawLabel()
Implements QwtAbstractScaleDraw.
void QwtAbstractScaleDraw::enableComponent (ScaleComponentcomponent,
boolenable = true) [inherited] En/Disable a component of the scale
Parameters:
component Scale component
enable On/Off
See also:
hasComponent()
int QwtRoundScaleDraw::extent (const QPen &pen, const QFont &font) const
[virtual, inherited] Calculate the extent of the scale
The extent is the distcance 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:
pen Pen that is used for painting backbone and ticks
font Font used for painting the labels
See also:
setMinimumExtent(), minimumExtent()
Warning:
The implemented algo is not too smart and calculates only an upper
limit, that might be a few pixels too large
Implements QwtAbstractScaleDraw.
bool QwtAbstractScaleDraw::hasComponent (ScaleComponentcomponent) const
[inherited] Check if a component is enabled
See also:
enableComponent()
void QwtAbstractScaleDraw::invalidateCache () [protected, inherited]
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.
QwtText QwtDialScaleDraw::label (doublevalue) const [virtual] Call
QwtDial::scaleLabel of the parent dial widget.
Parameters:
value Value to display
See also:
QwtDial::scaleLabel()
Reimplemented from QwtAbstractScaleDraw.
int QwtAbstractScaleDraw::majTickLength () const [inherited] The same as
QwtAbstractScaleDraw::tickLength(QwtScaleDiv::MajorTick).
const QwtScaleMap & QwtAbstractScaleDraw::map () const [inherited] Returns:
Map how to translate between scale and pixel values
int QwtAbstractScaleDraw::minimumExtent () const [inherited] Get the
minimum extent
See also:
extent(), setMinimumExtent()
void QwtRoundScaleDraw::moveCenter (intx, inty) [inline, inherited]
Move the center of the scale draw, leaving the radius unchanged.
void QwtRoundScaleDraw::moveCenter (const QPoint ¢er) [inherited] Move
the center of the scale draw, leaving the radius unchanged
Parameters:
center New center
See also:
setRadius()
uint QwtDialScaleDraw::penWidth () const Returns:
Pen width used for painting the scale
See also:
setPenWidth, QwtDial::drawScale()
int QwtRoundScaleDraw::radius () const [inherited] Get the radius
Radius is the radius of the backbone without ticks and labels.
See also:
setRadius(), extent()
const QwtScaleDiv & QwtAbstractScaleDraw::scaleDiv () const [inherited]
Returns:
scale division
QwtScaleMap & QwtAbstractScaleDraw::scaleMap () [inherited] Returns:
Map how to translate between scale and pixel values
void QwtRoundScaleDraw::setAngleRange (doubleangle1, doubleangle2)
[inherited]
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:
· The angle range is limited to [-360, 360] degrees. Angles
exceeding this range will be clipped.
· For angles more than 359 degrees above or below min(angle1,
angle2), scale marks will not be drawn.
· If you need a counterclockwise scale, use QwtScaleDiv::setRange
void QwtAbstractScaleDraw::setMinimumExtent (intminExtent) [inherited]
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()
void QwtDialScaleDraw::setPenWidth (uintpenWidth) Set the pen width used
for painting the scale
Parameters:
penWidth Pen width
See also:
penWidth(), QwtDial::drawScale()
void QwtRoundScaleDraw::setRadius (intradius) [inherited] Change of radius
the scale
Radius is the radius of the backbone without ticks and labels.
Parameters:
radius New Radius
See also:
moveCenter()
void QwtAbstractScaleDraw::setScaleDiv (const QwtScaleDiv &sd) [inherited]
Change the scale division
Parameters:
sd New scale division
void QwtAbstractScaleDraw::setSpacing (intspacing) [inherited]
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:
spacing()
void QwtAbstractScaleDraw::setTickLength (QwtScaleDiv::TickTypetickType,
intlength) [inherited] Set the length of the ticks
Parameters:
tickType Tick type
length New length
Warning:
the length is limited to [0..1000]
void QwtAbstractScaleDraw::setTransformation (QwtScaleTransformation
*transformation) [inherited] Change the transformation of the scale
Parameters:
transformation New scale transformation
int QwtAbstractScaleDraw::spacing () const [inherited]
Get the spacing. The spacing is the distance between ticks and labels.
The default spacing is 4 pixels.
See also:
setSpacing()
const QwtText & QwtAbstractScaleDraw::tickLabel (const QFont &font,
doublevalue) const [protected, inherited]
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
int QwtAbstractScaleDraw::tickLength (QwtScaleDiv::TickTypetickType) const
[inherited] Return the length of the ticks
See also:
setTickLength(), majTickLength()Author
Generated automatically by Doxygen for Qwt User's Guide from the source
code.
Version 5.2.2 Mon Aug 1 2011 QwtDialScaleDraw(3)
