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

.TH "QwtDialNeedle" 3 "Mon Dec 28 2020" "Version 6.1.6" "Qwt User's Guide" \" -*- nroff -*-
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.SH NAME
QwtDialNeedle \- Base class for needles that can be used in a \fBQwtDial\fP\&.  

.SH SYNOPSIS
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.PP
.PP
\fC#include <qwt_dial_needle\&.h>\fP
.PP
Inherited by \fBQwtCompassMagnetNeedle\fP, \fBQwtCompassWindArrow\fP, and \fBQwtDialSimpleNeedle\fP\&.
.SS "Public Member Functions"

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.RI "\fBQwtDialNeedle\fP ()"
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.RI "Constructor\&. "
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.RI "virtual \fB~QwtDialNeedle\fP ()"
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.RI "Destructor\&. "
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.RI "virtual void \fBsetPalette\fP (const QPalette &)"
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.RI "const QPalette & \fBpalette\fP () const"
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.RI "virtual void \fBdraw\fP (QPainter *painter, const QPointF &center, double length, double direction, QPalette::ColorGroup=QPalette::Active) const"
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.SS "Protected Member Functions"

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.RI "virtual void \fBdrawNeedle\fP (QPainter *painter, double length, QPalette::ColorGroup colorGroup) const =0"
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.RI "Draw the needle\&. "
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.RI "virtual void \fBdrawKnob\fP (QPainter *, double width, const QBrush &, bool sunken) const"
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.RI "Draw the knob\&. "
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.SH "Detailed Description"
.PP 
Base class for needles that can be used in a \fBQwtDial\fP\&. 

\fBQwtDialNeedle\fP is a pointer that indicates a value by pointing to a specific direction\&.
.PP
\fBSee also\fP
.RS 4
\fBQwtDial\fP, \fBQwtCompass\fP 
.RE
.PP

.SH "Member Function Documentation"
.PP 
.SS "void QwtDialNeedle::draw (QPainter * painter, const QPointF & center, double length, double direction, QPalette::ColorGroup colorGroup = \fCQPalette::Active\fP) const\fC [virtual]\fP"
Draw the needle
.PP
\fBParameters\fP
.RS 4
\fIpainter\fP Painter 
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\fIcenter\fP Center of the dial, start position for the needle 
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\fIlength\fP Length of the needle 
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\fIdirection\fP Direction of the needle, in degrees counter clockwise 
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\fIcolorGroup\fP Color group, used for painting 
.RE
.PP

.SS "virtual void QwtDialNeedle::drawNeedle (QPainter * painter, double length, QPalette::ColorGroup colorGroup) const\fC [protected]\fP, \fC [pure virtual]\fP"

.PP
Draw the needle\&. The origin of the needle is at position (0\&.0, 0\&.0 ) pointing in direction 0\&.0 ( = east )\&.
.PP
The painter is already initialized with translation and rotation\&.
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\fBParameters\fP
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\fIpainter\fP Painter 
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\fIlength\fP Length of the needle 
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\fIcolorGroup\fP Color group, used for painting
.RE
.PP
\fBSee also\fP
.RS 4
\fBsetPalette()\fP, \fBpalette()\fP 
.RE
.PP

.PP
Implemented in \fBQwtCompassWindArrow\fP, \fBQwtCompassMagnetNeedle\fP, and \fBQwtDialSimpleNeedle\fP\&.
.SS "const QPalette & QwtDialNeedle::palette () const"

.PP
\fBReturns\fP
.RS 4
the palette of the needle\&. 
.RE
.PP

.SS "void QwtDialNeedle::setPalette (const QPalette & palette)\fC [virtual]\fP"
Sets the palette for the needle\&.
.PP
\fBParameters\fP
.RS 4
\fIpalette\fP New Palette 
.RE
.PP


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