.TH "QwtRoundScaleDraw" 3 "Thu Dec 11 2014" "Version 6.1.2" "Qwt User's Guide" \" -*- nroff -*-
.ad l
.nh
.SH NAME
QwtRoundScaleDraw \- 
.PP
A class for drawing round scales\&.  

.SH SYNOPSIS
.br
.PP
.PP
\fC#include <qwt_round_scale_draw\&.h>\fP
.PP
Inherits \fBQwtAbstractScaleDraw\fP\&.
.PP
Inherited by QwtAnalogClockScaleDraw, and \fBQwtCompassScaleDraw\fP\&.
.SS "Public Member Functions"

.in +1c
.ti -1c
.RI "\fBQwtRoundScaleDraw\fP ()"
.br
.RI "\fIConstructor\&. \fP"
.ti -1c
.RI "virtual \fB~QwtRoundScaleDraw\fP ()"
.br
.RI "\fIDestructor\&. \fP"
.ti -1c
.RI "void \fBsetRadius\fP (double \fBradius\fP)"
.br
.ti -1c
.RI "double \fBradius\fP () const "
.br
.ti -1c
.RI "void \fBmoveCenter\fP (double x, double y)"
.br
.RI "\fIMove the center of the scale draw, leaving the radius unchanged\&. \fP"
.ti -1c
.RI "void \fBmoveCenter\fP (const QPointF &)"
.br
.ti -1c
.RI "QPointF \fBcenter\fP () const "
.br
.RI "\fIGet the center of the scale\&. \fP"
.ti -1c
.RI "void \fBsetAngleRange\fP (double angle1, double angle2)"
.br
.RI "\fIAdjust the baseline circle segment for round scales\&. \fP"
.ti -1c
.RI "virtual double \fBextent\fP (const QFont &) const "
.br
.in -1c
.SS "Protected Member Functions"

.in +1c
.ti -1c
.RI "virtual void \fBdrawTick\fP (QPainter *, double val, double len) const "
.br
.ti -1c
.RI "virtual void \fBdrawBackbone\fP (QPainter *) const "
.br
.ti -1c
.RI "virtual void \fBdrawLabel\fP (QPainter *, double val) const "
.br
.in -1c
.SS "Additional Inherited Members"
.SH "Detailed Description"
.PP 
A class for drawing round scales\&. 

\fBQwtRoundScaleDraw\fP can be used to draw round scales\&. The circle segment can be adjusted by \fBsetAngleRange()\fP\&. The geometry of the scale can be specified with \fBmoveCenter()\fP and \fBsetRadius()\fP\&.
.PP
After a scale division has been specified as a \fBQwtScaleDiv\fP object using \fBQwtAbstractScaleDraw::setScaleDiv(const QwtScaleDiv &s)\fP, the scale can be drawn with the \fBQwtAbstractScaleDraw::draw()\fP member\&. 
.SH "Constructor & Destructor Documentation"
.PP 
.SS "QwtRoundScaleDraw::QwtRoundScaleDraw ()"

.PP
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]\&. 
.SH "Member Function Documentation"
.PP 
.SS "void QwtRoundScaleDraw::drawBackbone (QPainter *painter) const\fC [protected]\fP, \fC [virtual]\fP"
Draws the baseline of the scale 
.PP
\fBParameters:\fP
.RS 4
\fIpainter\fP Painter
.RE
.PP
\fBSee Also:\fP
.RS 4
\fBdrawTick()\fP, \fBdrawLabel()\fP 
.RE
.PP

.PP
Implements \fBQwtAbstractScaleDraw\fP\&.
.SS "void QwtRoundScaleDraw::drawLabel (QPainter *painter, doublevalue) const\fC [protected]\fP, \fC [virtual]\fP"
Draws the label for a major scale tick
.PP
\fBParameters:\fP
.RS 4
\fIpainter\fP Painter 
.br
\fIvalue\fP Value
.RE
.PP
\fBSee Also:\fP
.RS 4
\fBdrawTick()\fP, \fBdrawBackbone()\fP 
.RE
.PP

.PP
Implements \fBQwtAbstractScaleDraw\fP\&.
.SS "void QwtRoundScaleDraw::drawTick (QPainter *painter, doublevalue, doublelen) const\fC [protected]\fP, \fC [virtual]\fP"
Draw a tick
.PP
\fBParameters:\fP
.RS 4
\fIpainter\fP Painter 
.br
\fIvalue\fP Value of the tick 
.br
\fIlen\fP Length of the tick
.RE
.PP
\fBSee Also:\fP
.RS 4
\fBdrawBackbone()\fP, \fBdrawLabel()\fP 
.RE
.PP

.PP
Implements \fBQwtAbstractScaleDraw\fP\&.
.SS "double QwtRoundScaleDraw::extent (const QFont &font) const\fC [virtual]\fP"
Calculate the extent of the scale
.PP
The extent is the distance between the baseline to the outermost pixel of the scale draw\&. \fBradius()\fP + \fBextent()\fP is an upper limit for the radius of the bounding circle\&.
.PP
\fBParameters:\fP
.RS 4
\fIfont\fP Font used for painting the labels 
.RE
.PP
\fBReturns:\fP
.RS 4
Calculated extent
.RE
.PP
\fBSee Also:\fP
.RS 4
\fBsetMinimumExtent()\fP, \fBminimumExtent()\fP 
.RE
.PP
\fBWarning:\fP
.RS 4
The implemented algorithm is not too smart and calculates only an upper limit, that might be a few pixels too large 
.RE
.PP

.PP
Implements \fBQwtAbstractScaleDraw\fP\&.
.SS "void QwtRoundScaleDraw::moveCenter (const QPointF &center)"
Move the center of the scale draw, leaving the radius unchanged
.PP
\fBParameters:\fP
.RS 4
\fIcenter\fP New center 
.RE
.PP
\fBSee Also:\fP
.RS 4
\fBsetRadius()\fP 
.RE
.PP

.SS "double QwtRoundScaleDraw::radius () const"
Get the radius
.PP
Radius is the radius of the backbone without ticks and labels\&.
.PP
\fBReturns:\fP
.RS 4
Radius of the scale 
.RE
.PP
\fBSee Also:\fP
.RS 4
\fBsetRadius()\fP, \fBextent()\fP 
.RE
.PP

.SS "void QwtRoundScaleDraw::setAngleRange (doubleangle1, doubleangle2)"

.PP
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\&. 
.PP
\fBParameters:\fP
.RS 4
\fIangle1\fP 
.br
\fIangle2\fP boundaries of the angle interval in degrees\&. 
.RE
.PP
\fBWarning:\fP
.RS 4
.PD 0
.IP "\(bu" 2
The angle range is limited to [-360, 360] degrees\&. Angles exceeding this range will be clipped\&. 
.IP "\(bu" 2
For angles more or equal than 360 degrees above or below min(angle1, angle2), scale marks will not be drawn\&. 
.IP "\(bu" 2
If you need a counterclockwise scale, use \fBQwtScaleDiv::setInterval()\fP 
.PP
.RE
.PP

.SS "void QwtRoundScaleDraw::setRadius (doubleradius)"
Change of radius the scale
.PP
Radius is the radius of the backbone without ticks and labels\&.
.PP
\fBParameters:\fP
.RS 4
\fIradius\fP New Radius 
.RE
.PP
\fBSee Also:\fP
.RS 4
\fBmoveCenter()\fP 
.RE
.PP


.SH "Author"
.PP 
Generated automatically by Doxygen for Qwt User's Guide from the source code\&.