Public Types¶

enum Alignment { BottomScale, TopScale, LeftScale, RightScale }

Public Member Functions¶

QwtScaleDraw ()
Constructor. virtual ~QwtScaleDraw ()
Destructor. void getBorderDistHint (const QFont &, int &start, int &end) const
Determine the minimum border distance. int minLabelDist (const QFont &) const
int minLength (const QFont &) const
virtual double extent (const QFont &) const
void move (double x, double y)
void move (const QPointF &)
Move the position of the scale. void setLength (double length)
Alignment alignment () const
void setAlignment (Alignment)
Qt::Orientation orientation () const
QPointF pos () const
double length () const
void setLabelAlignment (Qt::Alignment)
Change the label flags. Qt::Alignment labelAlignment () const
void setLabelRotation (double rotation)
double labelRotation () const
int maxLabelHeight (const QFont &) const
int maxLabelWidth (const QFont &) const
QPointF labelPosition (double value) const
QRectF labelRect (const QFont &, double value) const
QSizeF labelSize (const QFont &, double value) const
QRect boundingLabelRect (const QFont &, double value) const
Find the bounding rectangle for the label.

Protected Member Functions¶

QTransform labelTransformation (const QPointF &, const QSizeF &) const
virtual void drawTick (QPainter *, double value, double len) const
virtual void drawBackbone (QPainter *) const
virtual void drawLabel (QPainter *, double value) const

enum QwtScaleDraw::Alignment¶

Alignment of the scale draw

See also:

Enumerator

BottomScale

The scale is below.

TopScale

The scale is above.

LeftScale

The scale is left.

RightScale

The scale is right.

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::Alignment QwtScaleDraw::alignment () const¶

Return alignment of the scale

See also:

Returns:

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

Find the bounding rectangle for the label. The coordinates of the rectangle are absolute ( calculated from pos() ). in direction of the tick.

Parameters:

Returns:

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

Draws the baseline of the scale

Parameters:

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Implements QwtAbstractScaleDraw.

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

Draws the label for a major scale tick

Parameters:

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Implements QwtAbstractScaleDraw.

void QwtScaleDraw::drawTick (QPainter * painter, double value, double len) const [protected], [virtual]¶

Draw a tick

Parameters:

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Implements QwtAbstractScaleDraw.

double QwtScaleDraw::extent (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:

Returns:

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:

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QPointF QwtScaleDraw::labelPosition (double value) const¶

Find the position, where to paint a label

The position has a distance that depends on the length of the ticks in direction of the alignment().

Parameters:

Returns:

QRectF QwtScaleDraw::labelRect (const QFont & font, double value) const¶

Find the bounding rectangle for the label. The coordinates of the rectangle are relative to spacing + tick length from the backbone in direction of the tick.

Parameters:

Returns:

double QwtScaleDraw::labelRotation () const¶

Returns:

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QSizeF QwtScaleDraw::labelSize (const QFont & font, double value) const¶

Calculate the size that is needed to draw a label

Parameters:

Returns:

QTransform QwtScaleDraw::labelTransformation (const QPointF & pos, const QSizeF & size) const [protected]¶

Calculate the transformation that is needed to paint a label depending on its alignment and rotation.

Parameters:

Returns:

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double QwtScaleDraw::length () const¶

Returns:

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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:

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

Calculate the minimum length that is needed to draw the scale

Parameters:

Returns:

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void QwtScaleDraw::move (double x, double y) [inline]¶

Move the position of the scale

Parameters:

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void QwtScaleDraw::move (const QPointF & 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:

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

Return the orientation

TopScale, BottomScale are horizontal (Qt::Horizontal) scales, LeftScale, RightScale are vertical (Qt::Vertical) scales.

Returns:

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QPointF QwtScaleDraw::pos () const¶

Returns:

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void QwtScaleDraw::setAlignment (Alignment align)¶

Set the alignment of the scale

Parameters:

The default alignment is QwtScaleDraw::BottomScale

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void QwtScaleDraw::setLabelAlignment (Qt::Alignment alignment)¶

Change the label flags. Labels are aligned to the point tick length + 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:

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Warning:

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:

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void QwtScaleDraw::setLength (double length)¶

Set the length of the backbone.

The length doesn't include the space needed for overlapping labels.

Parameters:

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