NAME¶

QwtRoundScaleDraw - A class for drawing round scales.

SYNOPSIS¶

#include <qwt_round_scale_draw.h> Inherits QwtAbstractScaleDraw. Inherited by QwtDialScaleDraw.

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

Detailed Description¶

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.

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].

QwtRoundScaleDraw::~QwtRoundScaleDraw () [virtual]¶

Destructor.

Member Function Documentation¶

QPointF QwtRoundScaleDraw::center () const¶

Get the center of the scale.

void QwtRoundScaleDraw::drawBackbone (QPainter *painter) const [protected, virtual] Draws the baseline of the scale¶

Parameters: See also: Implements QwtAbstractScaleDraw.

void QwtRoundScaleDraw::drawLabel (QPainter *painter, doublevalue) const [protected, virtual] Draws the label for a major scale tick¶

Parameters: See also: Implements QwtAbstractScaleDraw.

void QwtRoundScaleDraw::drawTick (QPainter *painter, doublevalue, doublelen) const [protected, virtual] Draw a tick¶

Parameters: See also: 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. Parameters: See also: Warning: Implements QwtAbstractScaleDraw.

void QwtRoundScaleDraw::moveCenter (doublex, doubley) [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¶

Parameters: See also:

int QwtRoundScaleDraw::radius () const Get the radius¶

Radius is the radius of the backbone without ticks and labels. See also:

void QwtRoundScaleDraw::setAngleRange (doubleangle1, doubleangle2)¶

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: Warning:

void QwtRoundScaleDraw::setRadius (intradius) Change of radius the scale¶

Radius is the radius of the backbone without ticks and labels. Parameters: See also:

Author¶

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