NAME¶

QwtScaleDraw -

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 () Alignment alignment () const QRect boundingLabelRect (const QFont &, double val) const virtual int extent (const QPen &, const QFont &) const void getBorderDistHint (const QFont &, int &start, int &end) const Qt::Alignment labelAlignment () const QPoint labelPosition (double val) const QRect labelRect (const QFont &, double val) const double labelRotation () const QSize labelSize (const QFont &, double val) const int length () const int maxLabelHeight (const QFont &) const int maxLabelWidth (const QFont &) const int minLabelDist (const QFont &) const int minLength (const QPen &, const QFont &) const void move (int x, int y) void move (const QPoint &) QwtScaleDraw & operator= (const QwtScaleDraw &other) Qt::Orientation orientation () const QPoint pos () const void setAlignment (Alignment) void setLabelAlignment (Qt::Alignment) void setLabelRotation (double rotation) void setLength (int length)

Protected Member Functions¶

virtual void drawBackbone (QPainter *p) const virtual void drawLabel (QPainter *p, double val) const virtual void drawTick (QPainter *p, double val, int len) const QMatrix labelMatrix (const QPoint &, const QSize &) 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::Alignment¶

Alignment of the scale draw See also:

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.

Member Function Documentation¶

QwtScaleDraw::Alignment QwtScaleDraw::alignment () const¶

Return alignment of the scale See also:

QRect QwtScaleDraw::boundingLabelRect (const QFont &font, doublevalue) const¶

Find the bounding rect for the label. The coordinates of the rect are absolute coordinates ( calculated from pos() ). in direction of the tick. Parameters: See also:

void QwtScaleDraw::drawBackbone (QPainter *painter) const [protected], [virtual]¶

Draws the baseline of the scale Parameters: See also: Implements QwtAbstractScaleDraw.

void QwtScaleDraw::drawLabel (QPainter *painter, doublevalue) const [protected], [virtual]¶

Draws the label for a major scale tick Parameters: See also: Implements QwtAbstractScaleDraw.

void QwtScaleDraw::drawTick (QPainter *painter, doublevalue, intlen) const [protected], [virtual]¶

Draw a tick Parameters: See also: 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: See also: 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:

Qt::Alignment QwtScaleDraw::labelAlignment () const¶

Returns: See also:

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: See also:

QPoint QwtScaleDraw::labelPosition (doublevalue) const¶

Find 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:

QRect QwtScaleDraw::labelRect (const QFont &font, doublevalue) const¶

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. Parameters:

double QwtScaleDraw::labelRotation () const¶

Returns: See also:

QSize QwtScaleDraw::labelSize (const QFont &font, doublevalue) const¶

Calculate the size that is needed to draw a label Parameters:

int QwtScaleDraw::length () const¶

Returns: See also:

int QwtScaleDraw::maxLabelHeight (const QFont &font) const¶

Parameters: Returns:

int QwtScaleDraw::maxLabelWidth (const QFont &font) const¶

Parameters: Returns:

int QwtScaleDraw::minLabelDist (const QFont &font) const¶

Determine the minimum distance between two labels, that is necessary that the texts don't overlap. Parameters: Returns: See also:

int QwtScaleDraw::minLength (const QPen &pen, const QFont &font) const¶

Calculate the minimum length that is needed to draw the scale Parameters: See also:

void QwtScaleDraw::move (intx, inty) [inline]¶

Move the position of the scale See also:

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: See also:

Qt::Orientation QwtScaleDraw::orientation () const¶

Return the orientation TopScale, BottomScale are horizontal (Qt::Horizontal) scales, LeftScale, RightScale are vertical (Qt::Vertical) scales. See also:

QPoint QwtScaleDraw::pos () const¶

Returns: See also:

void QwtScaleDraw::setAlignment ( Alignmentalign)¶

Set the alignment of the scale The default alignment is QwtScaleDraw::BottomScale See also:

void QwtScaleDraw::setLabelAlignment (Qt::Alignmentalignment)¶

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: See also: Warning:

void QwtScaleDraw::setLabelRotation (doublerotation)¶

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: See also:

void QwtScaleDraw::setLength (intlength)¶

Set the length of the backbone. The length doesn't include the space needed for overlapping labels. See also:

Author¶

Generated automatically by Doxygen for Qwt User's Guide from the source code.