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.TH "QwtScaleDraw" 3 "22 Mar 2009" "Qwt User's Guide" \" -*- nroff -*-
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QwtScaleDraw \- A class for drawing scales.
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\fC#include <qwt_scale_draw.h>\fP
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Inherits \fBQwtAbstractScaleDraw\fP.
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.RI "enum \fBAlignment\fP { \fBBottomScale\fP, \fBTopScale\fP, \fBLeftScale\fP, \fBRightScale\fP }"
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.SS "Public Member Functions"
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.RI "\fBQwtScaleDraw\fP ()"
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.RI "\fBQwtScaleDraw\fP (const \fBQwtScaleDraw\fP &)"
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.RI "virtual \fB~QwtScaleDraw\fP ()"
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.RI "\fBQwtScaleDraw\fP & \fBoperator=\fP (const \fBQwtScaleDraw\fP &other)"
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.RI "void \fBgetBorderDistHint\fP (const QFont &, int &start, int &end) const "
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.RI "int \fBminLabelDist\fP (const QFont &) const "
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.RI "int \fBminLength\fP (const QPen &, const QFont &) const "
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.RI "virtual int \fBextent\fP (const QPen &, const QFont &) const "
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.RI "void \fBmove\fP (int x, int y)"
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.RI "void \fBmove\fP (const QPoint &)"
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.RI "void \fBsetLength\fP (int length)"
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.RI "\fBAlignment\fP \fBalignment\fP () const "
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.RI "void \fBsetAlignment\fP (\fBAlignment\fP)"
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.RI "Qt::Orientation \fBorientation\fP () const "
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.RI "QPoint \fBpos\fP () const "
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.RI "int \fBlength\fP () const "
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.RI "void \fBsetLabelAlignment\fP (Qt::Alignment)"
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.RI "Qt::Alignment \fBlabelAlignment\fP () const "
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.RI "void \fBsetLabelRotation\fP (double rotation)"
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.RI "double \fBlabelRotation\fP () const "
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.RI "int \fBmaxLabelHeight\fP (const QFont &) const "
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.RI "int \fBmaxLabelWidth\fP (const QFont &) const "
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.RI "QPoint \fBlabelPosition\fP (double val) const "
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.RI "QRect \fBlabelRect\fP (const QFont &, double val) const "
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.RI "QSize \fBlabelSize\fP (const QFont &, double val) const "
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.RI "QRect \fBboundingLabelRect\fP (const QFont &, double val) const "
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.SS "Protected Member Functions"
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.RI "QMatrix \fBlabelMatrix\fP (const QPoint &, const QSize &) const "
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.RI "virtual void \fBdrawTick\fP (QPainter *p, double val, int len) const "
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.RI "virtual void \fBdrawBackbone\fP (QPainter *p) const "
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.RI "virtual void \fBdrawLabel\fP (QPainter *p, double val) const "
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.SH "Detailed Description"
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A class for drawing scales.
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\fBQwtScaleDraw\fP can be used to draw linear or logarithmic scales. A scale has a position, an alignment and a length, which can be specified . The labels can be rotated and aligned to the ticks using \fBsetLabelRotation()\fP and \fBsetLabelAlignment()\fP.
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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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.SH "Member Enumeration Documentation"
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.SS "enum \fBQwtScaleDraw::Alignment\fP"
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Alignment of the scale draw
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\fBsetAlignment()\fP, \fBalignment()\fP
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.SH "Constructor & Destructor Documentation"
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.SS "QwtScaleDraw::QwtScaleDraw ()"
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The range of the scale is initialized to [0, 100], The position is at (0, 0) with a length of 100. The orientation is QwtAbstractScaleDraw::Bottom.
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.SS "QwtScaleDraw::QwtScaleDraw (const \fBQwtScaleDraw\fP & other)"
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.SS "QwtScaleDraw::~QwtScaleDraw ()\fC [virtual]\fP"
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.SH "Member Function Documentation"
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.SS "\fBQwtScaleDraw::Alignment\fP QwtScaleDraw::alignment () const"
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Return alignment of the scale
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.SS "QRect QwtScaleDraw::boundingLabelRect (const QFont & font, double value) const"
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Find the bounding rect for the label. The coordinates of the rect are absolute coordinates ( calculated from \fBpos()\fP ). in direction of the tick.
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\fIfont\fP Font used for painting
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.SS "void QwtScaleDraw::drawBackbone (QPainter * painter) const\fC [protected, 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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Implements \fBQwtAbstractScaleDraw\fP.
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.SS "void QwtScaleDraw::drawLabel (QPainter * painter, double value) const\fC [protected, 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, \fBboundingLabelRect()\fP
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Implements \fBQwtAbstractScaleDraw\fP.
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.SS "void QwtScaleDraw::drawTick (QPainter * painter, double value, int len) const\fC [protected, 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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Implements \fBQwtAbstractScaleDraw\fP.
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.SS "int QwtScaleDraw::extent (const QPen & pen, const QFont & font) const\fC [virtual]\fP"
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Calculate the width/height that is needed for a vertical/horizontal scale.
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The extent is calculated from the pen width of the backbone, the major tick length, the spacing and the maximum width/height of the labels.
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\fIpen\fP Pen that is used for painting backbone and ticks
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\fIfont\fP Font used for painting the labels
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Implements \fBQwtAbstractScaleDraw\fP.
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.SS "void QwtScaleDraw::getBorderDistHint (const QFont & font, int & start, int & end) const"
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Determine the minimum border distance.
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This member function returns the minimum space needed to draw the mark labels at the scale's endpoints.
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\fIstart\fP Start border distance
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\fIend\fP End border distance
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.SS "Qt::Alignment QwtScaleDraw::labelAlignment () const"
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\fBsetLabelAlignment()\fP, \fBlabelRotation()\fP
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.SS "QMatrix QwtScaleDraw::labelMatrix (const QPoint & pos, const QSize & size) const\fC [protected]\fP"
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Calculate the matrix that is needed to paint a label depending on its alignment and rotation.
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\fIpos\fP Position where to paint the label
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\fIsize\fP Size of the label
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\fBsetLabelAlignment()\fP, \fBsetLabelRotation()\fP
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.SS "QPoint QwtScaleDraw::labelPosition (double value) const"
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Find the position, where to paint a label
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The position has a distance of \fBmajTickLength()\fP + \fBspacing()\fP + 1 from the backbone. The direction depends on the \fBalignment()\fP
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.SS "QRect QwtScaleDraw::labelRect (const QFont & font, double value) const"
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Find the bounding rect for the label. The coordinates of the rect are relative to spacing + ticklength from the backbone in direction of the tick.
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\fIfont\fP Font used for painting
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.SS "double QwtScaleDraw::labelRotation () const"
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\fBsetLabelRotation()\fP, \fBlabelAlignment()\fP
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.SS "QSize QwtScaleDraw::labelSize (const QFont & font, double value) const"
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Calculate the size that is needed to draw a label
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\fIfont\fP Label font
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.SS "int QwtScaleDraw::length () const"
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the length of the backbone
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\fBsetLength()\fP, \fBpos()\fP
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.SS "int QwtScaleDraw::maxLabelHeight (const QFont & font) const"
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the maximum height of a label
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.SS "int QwtScaleDraw::maxLabelWidth (const QFont & font) const"
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the maximum width of a label
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.SS "int QwtScaleDraw::minLabelDist (const QFont & font) const"
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Determine the minimum distance between two labels, that is necessary that the texts don't overlap.
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The maximum width of a label
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\fBgetBorderDistHint()\fP
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.SS "int QwtScaleDraw::minLength (const QPen & pen, const QFont & font) const"
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Calculate the minimum length that is needed to draw the scale
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\fIpen\fP Pen that is used for painting backbone and ticks
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\fIfont\fP Font used for painting the labels
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.SS "void QwtScaleDraw::move (const QPoint & pos)"
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Move the position of the scale.
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The meaning of the parameter pos depends on the alignment:
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.IP "\fBQwtScaleDraw::LeftScale \fP" 1c
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The origin is the topmost point of the backbone. The backbone is a vertical line. Scale marks and labels are drawn at the left of the backbone.
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.IP "\fBQwtScaleDraw::RightScale \fP" 1c
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The origin is the topmost point of the backbone. The backbone is a vertical line. Scale marks and labels are drawn at the right of the backbone.
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.IP "\fBQwtScaleDraw::TopScale \fP" 1c
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The origin is the leftmost point of the backbone. The backbone is a horizontal line. Scale marks and labels are drawn above the backbone.
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.IP "\fBQwtScaleDraw::BottomScale \fP" 1c
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The origin is the leftmost point of the backbone. The backbone is a horizontal line Scale marks and labels are drawn below the backbone.
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\fIpos\fP Origin of the scale
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\fBpos()\fP, \fBsetLength()\fP
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.SS "void QwtScaleDraw::move (int x, int y)\fC [inline]\fP"
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Move the position of the scale
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\fBmove(const QPoint &)\fP
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.SS "\fBQwtScaleDraw\fP & QwtScaleDraw::operator= (const \fBQwtScaleDraw\fP & other)"
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.SS "Qt::Orientation QwtScaleDraw::orientation () const"
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Return the orientation
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TopScale, BottomScale are horizontal (Qt::Horizontal) scales, LeftScale, RightScale are vertical (Qt::Vertical) scales.
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.SS "QPoint QwtScaleDraw::pos () const"
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\fBmove()\fP, \fBlength()\fP
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.SS "void QwtScaleDraw::setAlignment (\fBAlignment\fP align)"
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Set the alignment of the scale
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The default alignment is QwtScaleDraw::BottomScale
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.SS "void QwtScaleDraw::setLabelAlignment (Qt::Alignment alignment)"
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Change the label flags.
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Labels are aligned to the point ticklength + spacing away from the backbone.
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The alignment is relative to the orientation of the label text. In case of an flags of 0 the label will be aligned depending on the orientation of the scale:
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QwtScaleDraw::TopScale: Qt::AlignHCenter | Qt::AlignTop
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QwtScaleDraw::BottomScale: Qt::AlignHCenter | Qt::AlignBottom
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QwtScaleDraw::LeftScale: Qt::AlignLeft | Qt::AlignVCenter
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QwtScaleDraw::RightScale: Qt::AlignRight | Qt::AlignVCenter
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Changing the alignment is often necessary for rotated labels.
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\fIalignment\fP Or'd Qt::AlignmentFlags <see qnamespace.h>
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\fBsetLabelRotation()\fP, \fBlabelRotation()\fP, \fBlabelAlignment()\fP
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The various alignments might be confusing. The alignment of the label is not the alignment of the scale and is not the alignment of the flags (QwtText::flags()) returned from \fBQwtAbstractScaleDraw::label()\fP.
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.SS "void QwtScaleDraw::setLabelRotation (double rotation)"
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When changing the rotation, it might be necessary to adjust the label flags too. Finding a useful combination is often the result of try and error.
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\fIrotation\fP Angle in degrees. When changing the label rotation, the label flags often needs to be adjusted too.
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\fBsetLabelAlignment()\fP, \fBlabelRotation()\fP, \fBlabelAlignment()\fP.
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.SS "void QwtScaleDraw::setLength (int length)"
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Set the length of the backbone.
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The length doesn't include the space needed for overlapping labels.
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\fBmove()\fP, \fBminLabelDist()\fP
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