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Qwt User's Guide 6.0.0
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A class for drawing round scales. More...
#include <qwt_round_scale_draw.h>

Public Member Functions | |
| QwtRoundScaleDraw () | |
| virtual | ~QwtRoundScaleDraw () |
| void | setRadius (int radius) |
| int | radius () const |
| void | moveCenter (double x, double y) |
| void | moveCenter (const QPointF &) |
| QPointF | center () const |
| void | setAngleRange (double angle1, double angle2) |
| virtual double | extent (const QFont &) const |
Protected Member Functions | |
| virtual void | drawTick (QPainter *p, double val, double len) const |
| virtual void | drawBackbone (QPainter *p) const |
| virtual void | drawLabel (QPainter *p, double val) const |
A class for drawing round scales.
QwtRoundScaleDraw can be used to draw round scales. The circle segment can be adjusted by QwtRoundScaleDraw::setAngleRange(). The geometry of the scale can be specified with QwtRoundScaleDraw::moveCenter() and QwtRoundScaleDraw::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.
| 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].
| QwtRoundScaleDraw::~QwtRoundScaleDraw | ( | ) | [virtual] |
Destructor.
| QPointF QwtRoundScaleDraw::center | ( | ) | const |
Get the center of the scale.
| void QwtRoundScaleDraw::drawBackbone | ( | QPainter * | painter | ) | const [protected, virtual] |
Draws the baseline of the scale
| painter | Painter |
Implements QwtAbstractScaleDraw.
| void QwtRoundScaleDraw::drawLabel | ( | QPainter * | painter, |
| double | value | ||
| ) | const [protected, virtual] |
Draws the label for a major scale tick
| painter | Painter |
| value | Value |
Implements QwtAbstractScaleDraw.
| void QwtRoundScaleDraw::drawTick | ( | QPainter * | painter, |
| double | value, | ||
| double | len | ||
| ) | const [protected, virtual] |
Draw a tick
| painter | Painter |
| value | Value of the tick |
| len | Lenght of the tick |
Implements QwtAbstractScaleDraw.
| double QwtRoundScaleDraw::extent | ( | const QFont & | font | ) | const [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.
| font | Font used for painting the labels |
Implements QwtAbstractScaleDraw.
| void QwtRoundScaleDraw::moveCenter | ( | double | x, |
| double | y | ||
| ) | [inline] |
Move the center of the scale draw, leaving the radius unchanged.
| void QwtRoundScaleDraw::moveCenter | ( | const QPointF & | center | ) |
Move the center of the scale draw, leaving the radius unchanged
| center | New center |
| int QwtRoundScaleDraw::radius | ( | ) | const |
Get the radius
Radius is the radius of the backbone without ticks and labels.
| 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.
| angle1 | |
| angle2 | boundaries of the angle interval in degrees. |
| void QwtRoundScaleDraw::setRadius | ( | int | radius | ) |
Change of radius the scale
Radius is the radius of the backbone without ticks and labels.
| radius | New Radius |
1.7.3