QwtRoundScaleDraw - A class for drawing round scales.
NAME SYNOPSIS Public Member Functions Protected Member Functions Additional Inherited Members Detailed Description Constructor & Destructor Documentation QwtRoundScaleDraw::QwtRoundScaleDraw () QwtRoundScaleDraw::˜QwtRoundScaleDraw () [virtual] Member Function Documentation QPointF QwtRoundScaleDraw::center () const void QwtRoundScaleDraw::drawBackbone (QPainter * painter) const [override],[protected], [virtual] void QwtRoundScaleDraw::drawLabel (QPainter * painter, double value) const[override], [protected], [virtual] void QwtRoundScaleDraw::drawTick (QPainter * painter, double value, doublelen) const [override], [protected], [virtual] double QwtRoundScaleDraw::extent (const QFont & font) const [override],[virtual] void QwtRoundScaleDraw::moveCenter (const QPointF & center) void QwtRoundScaleDraw::moveCenter (double x, double y) [inline] double QwtRoundScaleDraw::radius () const void QwtRoundScaleDraw::setAngleRange (double angle1, double angle2) void QwtRoundScaleDraw::setRadius (double radius) AuthorNAME
QwtRoundScaleDraw − A class for drawing round scales.
SYNOPSIS
#include <qwt_round_scale_draw.h>
Inherits QwtAbstractScaleDraw.
Inherited by QwtCompassScaleDraw.
Public Member Functions
QwtRoundScaleDraw
()
Constructor.
virtual ˜QwtRoundScaleDraw ()
Destructor.
void setRadius (double radius)
double radius () const
void moveCenter (double x, double y)
Move the center of the scale draw, leaving the radius
unchanged.
void moveCenter (const QPointF &)
QPointF center () const
Get the center of the scale.
void setAngleRange (double angle1, double angle2)
Adjust the baseline circle segment for round scales.
virtual double extent (const QFont &) const
override
Public Member Functions inherited from QwtAbstractScaleDraw
QwtAbstractScaleDraw ()
Constructor.
virtual ˜QwtAbstractScaleDraw ()
Destructor.
void setScaleDiv (const QwtScaleDiv &)
const QwtScaleDiv & scaleDiv () const
void setTransformation (QwtTransform *)
const QwtScaleMap & scaleMap () const
QwtScaleMap & scaleMap ()
void enableComponent (ScaleComponent, bool
enable=true)
bool hasComponent (ScaleComponent) const
void setTickLength (QwtScaleDiv::TickType,
double length)
double tickLength (QwtScaleDiv::TickType)
const
double maxTickLength () const
void setSpacing (double)
Set the spacing between tick and labels.
double spacing () const
Get the spacing.
void setPenWidthF (qreal width)
Specify the width of the scale pen.
qreal penWidthF () const
virtual void draw (QPainter *, const QPalette &)
const
Draw the scale.
virtual QwtText label (double) const
Convert a value into its representing label.
void setMinimumExtent (double)
Set a minimum for the extent.
double minimumExtent () const
void invalidateCache ()
Protected Member Functions
virtual void
drawTick (QPainter *, double value, double len) const
override
virtual void drawBackbone (QPainter *) const override
virtual void drawLabel (QPainter *, double value)
const override
Protected Member Functions inherited from QwtAbstractScaleDraw
const QwtText &
tickLabel (const QFont &, double value) const
Convert a value into its representing label and cache
it.
Additional Inherited Members
Public Types inherited from QwtAbstractScaleDraw
enum ScaleComponent {
Backbone = 0x01, Ticks = 0x02, Labels =
0x04 }
typedef QFlags< ScaleComponent >
ScaleComponents
Detailed Description
A class for drawing round scales.
QwtRoundScaleDraw can be used to draw round scales. The circle segment can be adjusted by setAngleRange(). The geometry of the scale can be specified with moveCenter() and setRadius().
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 31 of file qwt_round_scale_draw.h.
Constructor & Destructor Documentation
QwtRoundScaleDraw::QwtRoundScaleDraw ()
Constructor. The range of the scale is initialized to [0, 100], The center is set to (50, 50) with a radius of 50. The angle range is set to [-135, 135].
Definition at line 44 of file qwt_round_scale_draw.cpp.
QwtRoundScaleDraw::˜QwtRoundScaleDraw () [virtual]
Destructor.
Definition at line 53 of file qwt_round_scale_draw.cpp.
Member Function Documentation
QPointF QwtRoundScaleDraw::center () const
Get the center of the scale.
Definition at line 96 of file qwt_round_scale_draw.cpp.
void QwtRoundScaleDraw::drawBackbone (QPainter * painter) const [override],[protected], [virtual]
Draws the baseline of the scale
Parameters
painter Painter
See also
drawTick(), drawLabel()
Implements QwtAbstractScaleDraw.
Definition at line 224 of file qwt_round_scale_draw.cpp.
void QwtRoundScaleDraw::drawLabel (QPainter * painter, double value) const[override], [protected], [virtual]
Draws the label for a major scale tick
Parameters
painter Painter
value Value
See also
drawTick(), drawBackbone()
Implements QwtAbstractScaleDraw.
Definition at line 145 of file qwt_round_scale_draw.cpp.
void QwtRoundScaleDraw::drawTick (QPainter * painter, double value, doublelen) const [override], [protected], [virtual]
Draw a tick
Parameters
painter Painter
value Value of the tick
len Length of the tick
See also
drawBackbone(), drawLabel()
Implements QwtAbstractScaleDraw.
Definition at line 190 of file qwt_round_scale_draw.cpp.
double QwtRoundScaleDraw::extent (const QFont & font) const [override],[virtual]
Calculate the extent of the scale
The extent is the distance 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
font Font used for painting the labels
Returns
Calculated extent
See also
setMinimumExtent(), minimumExtent()
Warning
The implemented algorithm is not too smart and calculates only an upper limit, that might be a few pixels too large
Implements QwtAbstractScaleDraw.
Definition at line 255 of file qwt_round_scale_draw.cpp.
void QwtRoundScaleDraw::moveCenter (const QPointF & center)
Move the center of the scale draw, leaving the radius unchanged
Parameters
center New center
See also
setRadius()
Definition at line 90 of file qwt_round_scale_draw.cpp.
void QwtRoundScaleDraw::moveCenter (double x, double y) [inline]
Move the center of the scale draw, leaving the radius unchanged.
Definition at line 64 of file qwt_round_scale_draw.h.
double QwtRoundScaleDraw::radius () const
Get the radius
Radius is the radius of the backbone without ticks and labels.
Returns
Radius of the scale
See also
setRadius(), extent()
Definition at line 79 of file qwt_round_scale_draw.cpp.
void QwtRoundScaleDraw::setAngleRange (double angle1, double angle2)
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 or equal than 360 degrees above or below min(angle1, angle2), scale marks will not be drawn. | ||
|
• |
If you need a counterclockwise scale, use QwtScaleDiv::setInterval() |
Definition at line 118 of file qwt_round_scale_draw.cpp.
void QwtRoundScaleDraw::setRadius (double radius)
Change of radius the scale
Radius is the radius of the backbone without ticks and labels.
Parameters
radius New Radius
See also
moveCenter()
Definition at line 66 of file qwt_round_scale_draw.cpp.
Author
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