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.TH "QwtAbstractScaleDraw" 3 "11 Jun 2007" "Version 5.0.2" "Qwt User's Guide" \" -*- nroff -*-
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QwtAbstractScaleDraw \-
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Inherited by \fBQwtRoundScaleDraw\fP, and \fBQwtScaleDraw\fP.
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.SH "Detailed Description"
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A abstract base class for drawing scales.
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\fBQwtAbstractScaleDraw\fP can be used to draw linear or logarithmic scales.
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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.
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Definition at line 37 of file qwt_abstract_scale_draw.h.
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.RI "enum \fBScaleComponent\fP { \fBBackbone\fP = 1, \fBTicks\fP = 2, \fBLabels\fP = 4 }"
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.SS "Public Member Functions"
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.RI "\fBQwtAbstractScaleDraw\fP ()"
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.RI "\fBQwtAbstractScaleDraw\fP (const \fBQwtAbstractScaleDraw\fP &)"
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.RI "virtual \fB~QwtAbstractScaleDraw\fP ()"
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.RI "\fBQwtAbstractScaleDraw\fP & \fBoperator=\fP (const \fBQwtAbstractScaleDraw\fP &)"
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.RI "void \fBsetScaleDiv\fP (const \fBQwtScaleDiv\fP &s)"
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.RI "const \fBQwtScaleDiv\fP & \fBscaleDiv\fP () const "
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.RI "void \fBsetTransformation\fP (\fBQwtScaleTransformation\fP *)"
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.RI "const \fBQwtScaleMap\fP & \fBmap\fP () const "
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.RI "void \fBenableComponent\fP (\fBScaleComponent\fP, bool enable=true)"
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.RI "bool \fBhasComponent\fP (\fBScaleComponent\fP) const "
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.RI "void \fBsetTickLength\fP (\fBQwtScaleDiv::TickType\fP, int length)"
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.RI "int \fBtickLength\fP (\fBQwtScaleDiv::TickType\fP) const "
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.RI "int \fBmajTickLength\fP () const "
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.RI "void \fBsetSpacing\fP (int margin)"
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.RI "int \fBspacing\fP () const "
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.RI "virtual void \fBdraw\fP (QPainter *, const QPalette &) const "
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.RI "virtual \fBQwtText\fP \fBlabel\fP (double) const "
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.RI "virtual int \fBextent\fP (const QPen &, const QFont &) const =0"
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.RI "void \fBsetMinimumExtent\fP (int)"
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.RI "int \fBminimumExtent\fP () const "
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.RI "\fBQwtScaleMap\fP & \fBscaleMap\fP ()"
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.SS "Protected Member Functions"
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.RI "virtual void \fBdrawTick\fP (QPainter *painter, double value, int len) const =0"
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.RI "virtual void \fBdrawBackbone\fP (QPainter *painter) const =0"
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.RI "virtual void \fBdrawLabel\fP (QPainter *painter, double value) const =0"
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.RI "void \fBinvalidateCache\fP ()"
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.RI "const \fBQwtText\fP & \fBtickLabel\fP (const QFont &, double value) const "
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.SH "Member Enumeration Documentation"
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.SS "enum \fBQwtAbstractScaleDraw::ScaleComponent\fP"
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Components of a scale
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\fBQwtAbstractScaleDraw::enableComponent\fP, \fBQwtAbstractScaleDraw::hasComponent\fP
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Definition at line 52 of file qwt_abstract_scale_draw.h.
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.SH "Constructor & Destructor Documentation"
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.SS "QwtAbstractScaleDraw::QwtAbstractScaleDraw ()"
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The range of the scale is initialized to [0, 100], The spacing (distance between ticks and labels) is set to 4, the tick lengths are set to 4,6 and 8 pixels
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Definition at line 54 of file qwt_abstract_scale_draw.cpp.
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.SS "QwtAbstractScaleDraw::QwtAbstractScaleDraw (const \fBQwtAbstractScaleDraw\fP &)"
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Definition at line 60 of file qwt_abstract_scale_draw.cpp.
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.SS "QwtAbstractScaleDraw::~QwtAbstractScaleDraw ()\fC [virtual]\fP"
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Definition at line 66 of file qwt_abstract_scale_draw.cpp.
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.SH "Member Function Documentation"
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.SS "void QwtAbstractScaleDraw::draw (QPainter * painter, const QPalette & palette) const\fC [virtual]\fP"
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\fIpainter\fP The painter
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\fIpalette\fP Palette, text color is used for the labels, foreground color for ticks and backbone
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Definition at line 164 of file qwt_abstract_scale_draw.cpp.
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Referenced by QwtThermo::draw(), QwtSlider::draw(), and QwtKnob::draw().
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.SS "virtual void QwtAbstractScaleDraw::drawBackbone (QPainter * painter) const\fC [protected, pure virtual]\fP"
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Draws the baseline of the scale
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\fIpainter\fP Painter
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\fBdrawTick()\fP, \fBdrawLabel()\fP
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Implemented in \fBQwtRoundScaleDraw\fP, and \fBQwtScaleDraw\fP.
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.SS "virtual void QwtAbstractScaleDraw::drawLabel (QPainter * painter, double value) const\fC [protected, pure virtual]\fP"
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Draws the label for a major scale tick
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\fIpainter\fP Painter
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\fBdrawTick\fP, \fBdrawBackbone\fP
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Implemented in \fBQwtRoundScaleDraw\fP, and \fBQwtScaleDraw\fP.
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.SS "virtual void QwtAbstractScaleDraw::drawTick (QPainter * painter, double value, int len) const\fC [protected, pure virtual]\fP"
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\fIpainter\fP Painter
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\fIvalue\fP Value of the tick
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\fIlen\fP Lenght of the tick
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\fBdrawBackbone()\fP, \fBdrawLabel()\fP
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Implemented in \fBQwtRoundScaleDraw\fP, and \fBQwtScaleDraw\fP.
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.SS "void QwtAbstractScaleDraw::enableComponent (\fBScaleComponent\fP component, bool enable = \fCtrue\fP)"
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En/Disable a component of the scale
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\fIcomponent\fP Scale component
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\fBQwtAbstractScaleDraw::hasComponent\fP
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Definition at line 85 of file qwt_abstract_scale_draw.cpp.
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Referenced by QwtDial::setScaleOptions().
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.SS "virtual int QwtAbstractScaleDraw::extent (const QPen &, const QFont &) const\fC [pure virtual]\fP"
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The extent is the distcance from the baseline to the outermost pixel of the scale draw in opposite to its orientation. It is at least \fBminimumExtent()\fP pixels.
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\fBsetMinimumExtent()\fP, \fBminimumExtent()\fP
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Implemented in \fBQwtRoundScaleDraw\fP, and \fBQwtScaleDraw\fP.
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.SS "bool QwtAbstractScaleDraw::hasComponent (\fBScaleComponent\fP component) const"
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Check if a component is enabled
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\fBQwtAbstractScaleDraw::enableComponent\fP
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Definition at line 98 of file qwt_abstract_scale_draw.cpp.
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Referenced by QwtRoundScaleDraw::drawLabel(), QwtScaleDraw::extent(), QwtRoundScaleDraw::extent(), QwtScaleDraw::getBorderDistHint(), QwtScaleDraw::labelPosition(), QwtScaleDraw::minLabelDist(), and QwtScaleDraw::minLength().
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.SS "void QwtAbstractScaleDraw::invalidateCache ()\fC [protected]\fP"
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Invalidate the cache used by \fBQwtAbstractScaleDraw::tickLabel\fP
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The cache is invalidated, when a new \fBQwtScaleDiv\fP is set. If the labels need to be changed. while the same \fBQwtScaleDiv\fP is set, \fBQwtAbstractScaleDraw::invalidateCache\fP needs to be called manually.
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Definition at line 402 of file qwt_abstract_scale_draw.cpp.
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.SS "\fBQwtText\fP QwtAbstractScaleDraw::label (double value) const\fC [virtual]\fP"
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Convert a value into its representing label.
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The value is converted to a plain text using QString::number(value). This method is often overloaded by applications to have individual labels.
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Reimplemented in \fBQwtDialScaleDraw\fP.
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Definition at line 359 of file qwt_abstract_scale_draw.cpp.
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Referenced by QwtRoundScaleDraw::drawLabel(), QwtRoundScaleDraw::extent(), QwtDialScaleDraw::label(), and tickLabel().
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.SS "int QwtAbstractScaleDraw::majTickLength () const"
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The same as QwtAbstractScaleDraw::tickLength(QwtScaleDiv::MajorTick).
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Definition at line 344 of file qwt_abstract_scale_draw.cpp.
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Referenced by QwtRoundScaleDraw::drawLabel(), QwtScaleDraw::extent(), and QwtScaleDraw::labelPosition().
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.SS "const \fBQwtScaleMap\fP & QwtAbstractScaleDraw::map () const"
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Map how to translate between scale and pixel values
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Definition at line 125 of file qwt_abstract_scale_draw.cpp.
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Referenced by QwtRoundScaleDraw::drawBackbone(), QwtScaleWidget::drawColorBar(), QwtRoundScaleDraw::drawLabel(), QwtScaleDraw::drawTick(), QwtRoundScaleDraw::drawTick(), QwtRoundScaleDraw::extent(), QwtScaleDraw::getBorderDistHint(), QwtScaleDraw::labelPosition(), and QwtScaleWidget::setScaleDiv().
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.SS "int QwtAbstractScaleDraw::minimumExtent () const"
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Get the minimum extent
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\fBextent()\fP, \fBsetMinimumExtent()\fP
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Definition at line 292 of file qwt_abstract_scale_draw.cpp.
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Referenced by QwtScaleDraw::extent().
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.SS "\fBQwtAbstractScaleDraw\fP & QwtAbstractScaleDraw::operator= (const \fBQwtAbstractScaleDraw\fP &)"
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Definition at line 71 of file qwt_abstract_scale_draw.cpp.
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.SS "const \fBQwtScaleDiv\fP & QwtAbstractScaleDraw::scaleDiv () const"
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Definition at line 137 of file qwt_abstract_scale_draw.cpp.
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Referenced by QwtRoundScaleDraw::extent(), QwtScaleDraw::getBorderDistHint(), QwtScaleDraw::maxLabelHeight(), QwtScaleDraw::maxLabelWidth(), QwtScaleDraw::minLabelDist(), QwtScaleDraw::minLength(), QwtScaleWidget::setScaleDiv(), and QwtPlot::sizeHint().
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.SS "\fBQwtScaleMap\fP & QwtAbstractScaleDraw::scaleMap ()"
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Map how to translate between scale and pixel values
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Definition at line 131 of file qwt_abstract_scale_draw.cpp.
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Referenced by QwtScaleDraw::drawTick(), QwtRoundScaleDraw::QwtRoundScaleDraw(), and QwtRoundScaleDraw::setAngleRange().
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.SS "void QwtAbstractScaleDraw::setMinimumExtent (int minExtent)"
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Set a minimum for the extent.
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The extent is calculated from the coomponents of the scale draw. In situations, where the labels are changing and the layout depends on the extent (f.e scrolling a scale), setting an upper limit as minimum extent will avoid jumps of the layout.
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\fIminExtent\fP Minimum extent
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\fBextent()\fP, \fBminimumExtent()\fP
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Definition at line 280 of file qwt_abstract_scale_draw.cpp.
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.SS "void QwtAbstractScaleDraw::setScaleDiv (const \fBQwtScaleDiv\fP & sd)"
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Change the scale division
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\fIsd\fP New scale division
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Definition at line 107 of file qwt_abstract_scale_draw.cpp.
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References QwtScaleDiv::hBound(), and QwtScaleDiv::lBound().
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Referenced by QwtScaleWidget::setScaleDiv().
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.SS "void QwtAbstractScaleDraw::setSpacing (int spacing)"
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Set the spacing between tick and labels.
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The spacing is the distance between ticks and labels. The default spacing is 4 pixels.
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\fIspacing\fP Spacing
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\fBQwtAbstractScaleDraw::spacing\fP
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Definition at line 246 of file qwt_abstract_scale_draw.cpp.
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.SS "void QwtAbstractScaleDraw::setTickLength (\fBQwtScaleDiv::TickType\fP tickType, int length)"
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Set the length of the ticks
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\fItickType\fP Tick type
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\fIlength\fP New length
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the length is limited to [0..1000]
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Definition at line 305 of file qwt_abstract_scale_draw.cpp.
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Referenced by QwtDial::setScaleTicks().
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.SS "void QwtAbstractScaleDraw::setTransformation (\fBQwtScaleTransformation\fP * transformation)"
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Change the transformation of the scale
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\fItransformation\fP New scale transformation
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Definition at line 118 of file qwt_abstract_scale_draw.cpp.
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Referenced by QwtScaleWidget::setScaleDiv().
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.SS "int QwtAbstractScaleDraw::spacing () const"
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The spacing is the distance between ticks and labels. The default spacing is 4 pixels.
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\fBQwtAbstractScaleDraw::setSpacing\fP
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Definition at line 262 of file qwt_abstract_scale_draw.cpp.
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Referenced by QwtRoundScaleDraw::drawLabel(), QwtScaleDraw::extent(), and QwtScaleDraw::labelPosition().
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.SS "const \fBQwtText\fP & QwtAbstractScaleDraw::tickLabel (const QFont & font, double value) const\fC [protected]\fP"
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Convert a value into its representing label and cache it.
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The conversion between value and label is called very often in the layout and painting code. Unfortunately the calculation of the label sizes might be slow (really slow for rich text in Qt4), so it's necessary to cache the labels.
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Definition at line 377 of file qwt_abstract_scale_draw.cpp.
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References label(), and QwtText::setRenderFlags().
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Referenced by QwtScaleDraw::drawLabel(), QwtRoundScaleDraw::drawLabel(), QwtRoundScaleDraw::extent(), and QwtScaleDraw::labelRect().
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.SS "int QwtAbstractScaleDraw::tickLength (\fBQwtScaleDiv::TickType\fP tickType) const"
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Return the length of the ticks
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\fBQwtAbstractScaleDraw::setTickLength\fP, \fBQwtAbstractScaleDraw::majTickLength\fP
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Definition at line 330 of file qwt_abstract_scale_draw.cpp.
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