Sources_For_Linux/Qwt/doc/man/man3/QwtRoundScaleDraw.3

.TH "QwtRoundScaleDraw" 3 "Mon Dec 28 2020" "Version 6.1.6" "Qwt User's Guide" \" -*- nroff -*-
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.SH NAME
QwtRoundScaleDraw \- A class for drawing round scales\&.  

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

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.RI "\fBQwtRoundScaleDraw\fP ()"
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.RI "Constructor\&. "
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.RI "virtual \fB~QwtRoundScaleDraw\fP ()"
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.RI "Destructor\&. "
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.RI "void \fBsetRadius\fP (double \fBradius\fP)"
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.RI "double \fBradius\fP () const"
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.RI "void \fBmoveCenter\fP (double x, double y)"
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.RI "Move the center of the scale draw, leaving the radius unchanged\&. "
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.RI "void \fBmoveCenter\fP (const QPointF &)"
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.RI "QPointF \fBcenter\fP () const"
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.RI "Get the center of the scale\&. "
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.RI "void \fBsetAngleRange\fP (double angle1, double angle2)"
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.RI "Adjust the baseline circle segment for round scales\&. "
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.RI "virtual double \fBextent\fP (const QFont &) const"
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.SS "Protected Member Functions"

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.RI "virtual void \fBdrawTick\fP (QPainter *, double value, double len) const"
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.RI "virtual void \fBdrawBackbone\fP (QPainter *) const"
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.RI "virtual void \fBdrawLabel\fP (QPainter *, double val) const"
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.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"
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.SS "QwtRoundScaleDraw::QwtRoundScaleDraw ()"

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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"
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.SS "void QwtRoundScaleDraw::drawBackbone (QPainter * painter) const\fC [protected]\fP, \fC [virtual]\fP"
Draws the baseline of the scale 
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\fBParameters\fP
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\fIpainter\fP Painter
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\fBSee also\fP
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\fBdrawTick()\fP, \fBdrawLabel()\fP 
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Implements \fBQwtAbstractScaleDraw\fP\&.
.SS "void QwtRoundScaleDraw::drawLabel (QPainter * painter, double value) const\fC [protected]\fP, \fC [virtual]\fP"
Draws the label for a major scale tick
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\fBParameters\fP
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\fIpainter\fP Painter 
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\fIvalue\fP Value
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\fBSee also\fP
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\fBdrawTick()\fP, \fBdrawBackbone()\fP 
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Implements \fBQwtAbstractScaleDraw\fP\&.
.SS "void QwtRoundScaleDraw::drawTick (QPainter * painter, double value, double len) const\fC [protected]\fP, \fC [virtual]\fP"
Draw a tick
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\fBParameters\fP
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\fIpainter\fP Painter 
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\fIvalue\fP Value of the tick 
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\fIlen\fP Length of the tick
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\fBSee also\fP
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\fBdrawBackbone()\fP, \fBdrawLabel()\fP 
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Implements \fBQwtAbstractScaleDraw\fP\&.
.SS "double QwtRoundScaleDraw::extent (const QFont & font) const\fC [virtual]\fP"
Calculate the extent of the scale
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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\&.
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\fBParameters\fP
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\fIfont\fP Font used for painting the labels 
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\fBReturns\fP
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Calculated extent
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\fBSee also\fP
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\fBsetMinimumExtent()\fP, \fBminimumExtent()\fP 
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\fBWarning\fP
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The implemented algorithm is not too smart and calculates only an upper limit, that might be a few pixels too large 
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Implements \fBQwtAbstractScaleDraw\fP\&.
.SS "void QwtRoundScaleDraw::moveCenter (const QPointF & center)"
Move the center of the scale draw, leaving the radius unchanged
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\fBParameters\fP
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\fIcenter\fP New center 
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\fBSee also\fP
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\fBsetRadius()\fP 
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.SS "double QwtRoundScaleDraw::radius () const"
Get the radius
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Radius is the radius of the backbone without ticks and labels\&.
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\fBReturns\fP
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Radius of the scale 
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\fBSee also\fP
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\fBsetRadius()\fP, \fBextent()\fP 
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.SS "void QwtRoundScaleDraw::setAngleRange (double angle1, double angle2)"

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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\&. 
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\fBParameters\fP
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\fIangle1\fP 
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\fIangle2\fP boundaries of the angle interval in degrees\&. 
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\fBWarning\fP
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.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 
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.SS "void QwtRoundScaleDraw::setRadius (double radius)"
Change of radius the scale
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Radius is the radius of the backbone without ticks and labels\&.
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\fBParameters\fP
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\fIradius\fP New Radius 
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\fBSee also\fP
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\fBmoveCenter()\fP 
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.SH "Author"
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Generated automatically by Doxygen for Qwt User's Guide from the source code\&.