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QwtScaleDraw
Langue: en
Version: 373940 (fedora - 01/12/10)
Section: 3 (Bibliothèques de fonctions)
Sommaire
- NAME
- SYNOPSIS
- Detailed Description
- Member Enumeration Documentation
- Constructor & Destructor Documentation
- Member Function Documentation
- QwtScaleDraw::Alignment QwtScaleDraw::alignment () constReturn alignment of the scale
- QRect QwtScaleDraw::boundingLabelRect (const QFont & font, double value) constFind the bounding rect for the label. The coordinates of the rect are absolute coordinates ( calculated from pos() ). in direction of the tick.
- void QwtScaleDraw::drawBackbone (QPainter * painter) const [protected, virtual]Draws the baseline of the scale
- void QwtScaleDraw::drawLabel (QPainter * painter, double value) const [protected, virtual]Draws the label for a major scale tick
- void QwtScaleDraw::drawTick (QPainter * painter, double value, int len) const [protected, virtual]Draw a tick
- int QwtScaleDraw::extent (const QPen & pen, const QFont & font) const [virtual]Calculate the width/height that is needed for a vertical/horizontal scale.
- void QwtScaleDraw::getBorderDistHint (const QFont & font, int & start, int & end) const
- Qt::Alignment QwtScaleDraw::labelAlignment () constReturns:
- QMatrix QwtScaleDraw::labelMatrix (const QPoint & pos, const QSize & size) const [protected]Calculate the matrix that is needed to paint a label depending on its alignment and rotation.
- QPoint QwtScaleDraw::labelPosition (double value) constFind the position, where to paint a label
- QRect QwtScaleDraw::labelRect (const QFont & font, double value) constFind the bounding rect for the label. The coordinates of the rect are relative to spacing + ticklength from the backbone in direction of the tick.
- double QwtScaleDraw::labelRotation () constReturns:
- QSize QwtScaleDraw::labelSize (const QFont & font, double value) constCalculate the size that is needed to draw a label
- int QwtScaleDraw::length () constReturns:
- int QwtScaleDraw::maxLabelHeight (const QFont & font) constParameters:
- int QwtScaleDraw::maxLabelWidth (const QFont & font) constParameters:
- int QwtScaleDraw::minLabelDist (const QFont & font) constDetermine the minimum distance between two labels, that is necessary that the texts don't overlap.
- int QwtScaleDraw::minLength (const QPen & pen, const QFont & font) constCalculate the minimum length that is needed to draw the scale
- void QwtScaleDraw::move (const QPoint & pos)
- void QwtScaleDraw::move (int x, int y) [inline]Move the position of the scale
- QwtScaleDraw & QwtScaleDraw::operator= (const QwtScaleDraw & other)
- Qt::Orientation QwtScaleDraw::orientation () constReturn the orientation
- QPoint QwtScaleDraw::pos () constReturns:
- void QwtScaleDraw::setAlignment (Alignment align)Set the alignment of the scale
- void QwtScaleDraw::setLabelAlignment (Qt::Alignment alignment)
- void QwtScaleDraw::setLabelRotation (double rotation)Rotate all labels.
- void QwtScaleDraw::setLength (int length)Set the length of the backbone.
- Author
NAME
QwtScaleDraw -A class for drawing scales.
SYNOPSIS
#include <qwt_scale_draw.h>
Inherits QwtAbstractScaleDraw.
Public Types
enum Alignment { BottomScale, TopScale, LeftScale, RightScale }
Public Member Functions
QwtScaleDraw ()
QwtScaleDraw (const QwtScaleDraw &)
virtual ~QwtScaleDraw ()
QwtScaleDraw & operator= (const QwtScaleDraw &other)
void getBorderDistHint (const QFont &, int &start, int &end) const
int minLabelDist (const QFont &) const
int minLength (const QPen &, const QFont &) const
virtual int extent (const QPen &, const QFont &) const
void move (int x, int y)
void move (const QPoint &)
void setLength (int length)
Alignment alignment () const
void setAlignment (Alignment)
Qt::Orientation orientation () const
QPoint pos () const
int length () const
void setLabelAlignment (Qt::Alignment)
Qt::Alignment labelAlignment () const
void setLabelRotation (double rotation)
double labelRotation () const
int maxLabelHeight (const QFont &) const
int maxLabelWidth (const QFont &) const
QPoint labelPosition (double val) const
QRect labelRect (const QFont &, double val) const
QSize labelSize (const QFont &, double val) const
QRect boundingLabelRect (const QFont &, double val) const
Protected Member Functions
QMatrix labelMatrix (const QPoint &, const QSize &) const
virtual void drawTick (QPainter *p, double val, int len) const
virtual void drawBackbone (QPainter *p) const
virtual void drawLabel (QPainter *p, double val) const
Detailed Description
A class for drawing scales.
QwtScaleDraw 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 setLabelRotation() and setLabelAlignment().
After a scale division has been specified as a QwtScaleDiv object using QwtAbstractScaleDraw::setScaleDiv(const QwtScaleDiv &s), the scale can be drawn with the QwtAbstractScaleDraw::draw() member.
Member Enumeration Documentation
enum QwtScaleDraw::AlignmentAlignment of the scale draw
See also:
- setAlignment(), alignment()
Constructor & Destructor Documentation
QwtScaleDraw::QwtScaleDraw ()
Constructor. 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.
QwtScaleDraw::QwtScaleDraw (const QwtScaleDraw & other)
Copy constructor.
QwtScaleDraw::~QwtScaleDraw () [virtual]
Destructor.
Member Function Documentation
QwtScaleDraw::Alignment QwtScaleDraw::alignment () constReturn alignment of the scale
See also:
- setAlignment()
QRect QwtScaleDraw::boundingLabelRect (const QFont & font, double value) constFind the bounding rect for the label. The coordinates of the rect are absolute coordinates ( calculated from pos() ). in direction of the tick.
Parameters:
- font Font used for painting
value Value
See also:
- labelRect()
void QwtScaleDraw::drawBackbone (QPainter * painter) const [protected, virtual]Draws the baseline of the scale
Parameters:
- painter Painter
See also:
- drawTick(), drawLabel()
Implements QwtAbstractScaleDraw.
void QwtScaleDraw::drawLabel (QPainter * painter, double value) const [protected, virtual]Draws the label for a major scale tick
Parameters:
- painter Painter
value Value
See also:
- drawTick(), drawBackbone(), boundingLabelRect()
Implements QwtAbstractScaleDraw.
void QwtScaleDraw::drawTick (QPainter * painter, double value, int len) const [protected, virtual]Draw a tick
Parameters:
- painter Painter
value Value of the tick
len Lenght of the tick
See also:
- drawBackbone(), drawLabel()
Implements QwtAbstractScaleDraw.
int QwtScaleDraw::extent (const QPen & pen, const QFont & font) const [virtual]Calculate the width/height that is needed for a vertical/horizontal scale.
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.
Parameters:
- pen Pen that is used for painting backbone and ticks
font Font used for painting the labels
See also:
- minLength()
Implements QwtAbstractScaleDraw.
void QwtScaleDraw::getBorderDistHint (const QFont & font, int & start, int & end) const
Determine the minimum border distance. This member function returns the minimum space needed to draw the mark labels at the scale's endpoints.
Parameters:
- font Font
start Start border distance
end End border distance
Qt::Alignment QwtScaleDraw::labelAlignment () constReturns:
- the label flags
See also:
- setLabelAlignment(), labelRotation()
QMatrix QwtScaleDraw::labelMatrix (const QPoint & pos, const QSize & size) const [protected]Calculate the matrix that is needed to paint a label depending on its alignment and rotation.
Parameters:
- pos Position where to paint the label
size Size of the label
See also:
- setLabelAlignment(), setLabelRotation()
QPoint QwtScaleDraw::labelPosition (double value) constFind the position, where to paint a label
The position has a distance of majTickLength() + spacing() + 1 from the backbone. The direction depends on the alignment()
Parameters:
- value Value
QRect QwtScaleDraw::labelRect (const QFont & font, double value) constFind the bounding rect for the label. The coordinates of the rect are relative to spacing + ticklength from the backbone in direction of the tick.
Parameters:
- font Font used for painting
value Value
double QwtScaleDraw::labelRotation () constReturns:
- the label rotation
See also:
- setLabelRotation(), labelAlignment()
QSize QwtScaleDraw::labelSize (const QFont & font, double value) constCalculate the size that is needed to draw a label
Parameters:
- font Label font
value Value
int QwtScaleDraw::length () constReturns:
- the length of the backbone
See also:
- setLength(), pos()
int QwtScaleDraw::maxLabelHeight (const QFont & font) constParameters:
- font Font
Returns:
- the maximum height of a label
int QwtScaleDraw::maxLabelWidth (const QFont & font) constParameters:
- font Font
Returns:
- the maximum width of a label
int QwtScaleDraw::minLabelDist (const QFont & font) constDetermine the minimum distance between two labels, that is necessary that the texts don't overlap.
Parameters:
- font Font
Returns:
- The maximum width of a label
See also:
- getBorderDistHint()
int QwtScaleDraw::minLength (const QPen & pen, const QFont & font) constCalculate the minimum length that is needed to draw the scale
Parameters:
- pen Pen that is used for painting backbone and ticks
font Font used for painting the labels
See also:
- extent()
void QwtScaleDraw::move (const QPoint & pos)
Move the position of the scale. The meaning of the parameter pos depends on the alignment:
- QwtScaleDraw::LeftScale
- 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.
- QwtScaleDraw::RightScale
- 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.
- QwtScaleDraw::TopScale
- The origin is the leftmost point of the backbone. The backbone is a horizontal line. Scale marks and labels are drawn above the backbone.
- QwtScaleDraw::BottomScale
- The origin is the leftmost point of the backbone. The backbone is a horizontal line Scale marks and labels are drawn below the backbone.
Parameters:
- pos Origin of the scale
See also:
- pos(), setLength()
void QwtScaleDraw::move (int x, int y) [inline]Move the position of the scale
See also:
- move(const QPoint &)
QwtScaleDraw & QwtScaleDraw::operator= (const QwtScaleDraw & other)
Assignment operator.
Qt::Orientation QwtScaleDraw::orientation () constReturn the orientation
TopScale, BottomScale are horizontal (Qt::Horizontal) scales, LeftScale, RightScale are vertical (Qt::Vertical) scales.
See also:
- alignment()
QPoint QwtScaleDraw::pos () constReturns:
- Origin of the scale
See also:
- move(), length()
void QwtScaleDraw::setAlignment (Alignment align)Set the alignment of the scale
The default alignment is QwtScaleDraw::BottomScale
See also:
- alignment()
void QwtScaleDraw::setLabelAlignment (Qt::Alignment alignment)
Change the label flags. Labels are aligned to the point ticklength + spacing away from the backbone.
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:
QwtScaleDraw::TopScale: Qt::AlignHCenter | Qt::AlignTop
QwtScaleDraw::BottomScale: Qt::AlignHCenter | Qt::AlignBottom
QwtScaleDraw::LeftScale: Qt::AlignLeft | Qt::AlignVCenter
QwtScaleDraw::RightScale: Qt::AlignRight | Qt::AlignVCenter
Changing the alignment is often necessary for rotated labels.
Parameters:
- alignment Or'd Qt::AlignmentFlags <see qnamespace.h>
See also:
- setLabelRotation(), labelRotation(), labelAlignment()
Warning:
- 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 QwtAbstractScaleDraw::label().
void QwtScaleDraw::setLabelRotation (double rotation)Rotate all labels.
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.
Parameters:
- rotation Angle in degrees. When changing the label rotation, the label flags often needs to be adjusted too.
See also:
- setLabelAlignment(), labelRotation(), labelAlignment().
void QwtScaleDraw::setLength (int length)Set the length of the backbone.
The length doesn't include the space needed for overlapping labels.
See also:
- move(), minLabelDist()
Author
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