Qwt User's Guide: QwtScaleWidget Class Reference

# QwtScaleWidget Class Reference

A Widget which contains a scale. More...

`#include <qwt_scale_widget.h>`

List of all members.

## Signals
void | scaleDivChanged ()
## Public Member Functions
| QwtScaleWidget (QWidget *parent=NULL)
| QwtScaleWidget (QwtScaleDraw::Alignment, QWidget *parent=NULL)
virtual | ~QwtScaleWidget ()
void | setTitle (const QString &title)
void | setTitle (const QwtText &title)
QwtText | title () const
void | setBorderDist (int start, int end)
int | startBorderDist () const
int | endBorderDist () const
void | getBorderDistHint (int &start, int &end) const
void | getMinBorderDist (int &start, int &end) const
void | setMinBorderDist (int start, int end)
void | setMargin (int)
int | margin () const
void | setSpacing (int td)
int | spacing () const
void | setPenWidth (int)
int | penWidth () const
void | setScaleDiv (QwtScaleTransformation *, const QwtScaleDiv &sd)
void | setScaleDraw (QwtScaleDraw *)
const QwtScaleDraw * | scaleDraw () const
QwtScaleDraw * | scaleDraw ()
void | setLabelAlignment (Qt::Alignment)
void | setLabelRotation (double rotation)
void | setColorBarEnabled (bool)
bool | isColorBarEnabled () const
void | setColorBarWidth (int)
int | colorBarWidth () const
void | setColorMap (const QwtDoubleInterval &, const QwtColorMap &)
QwtDoubleInterval | colorBarInterval () const
const QwtColorMap & | colorMap () const
virtual QSize | sizeHint () const
virtual QSize | minimumSizeHint () const
int | titleHeightForWidth (int width) const
int | dimForLength (int length, const QFont &scaleFont) const
void | drawColorBar (QPainter *painter, const QRect &rect) const
void | drawTitle (QPainter *painter, QwtScaleDraw::Alignment, const QRect &rect) const
void | setAlignment (QwtScaleDraw::Alignment)
QwtScaleDraw::Alignment | alignment () const
QRect | colorBarRect (const QRect &) const
## Protected Member Functions
virtual void | paintEvent (QPaintEvent *e)
virtual void | resizeEvent (QResizeEvent *e)
void | draw (QPainter *p) const
void | scaleChange ()
void | layoutScale (bool update=true)

## Detailed Description

A Widget which contains a scale.

This Widget can be used to decorate composite widgets with a scale.

## Constructor & Destructor Documentation

QwtScaleWidget::QwtScaleWidget | ( | QWidget * | parent = `NULL` | ) | `[explicit]`

Create a scale with the position QwtScaleWidget::Left.

Parameters:

  | parent | Parent widget

QwtScaleWidget::QwtScaleWidget | ( | QwtScaleDraw::Alignment | align,
|  | QWidget * | parent = `NULL` |
| ) |  |  | `[explicit]`

Constructor.

Parameters:

  | align | Alignment.
  | parent | Parent widget

QwtScaleWidget::~QwtScaleWidget | ( |  | ) | `[virtual]`

Destructor.

## Member Function Documentation

QwtScaleDraw::Alignment QwtScaleWidget::alignment | ( |  | ) | const

Returns:
  position

See also:
  setPosition()

int QwtScaleWidget::dimForLength | ( | int | length,
|  | const QFont & | scaleFont |
| ) |  |  | const

Find the minimum dimension for a given length. dim is the height, length the width seen in direction of the title.

Parameters:

  | length | width for horizontal, height for vertical scales
  | scaleFont | Font of the scale

Returns:
  height for horizontal, width for vertical scales

void QwtScaleWidget::draw | ( | QPainter * | p | ) | const`[protected]`

draw the scale

void QwtScaleWidget::drawTitle | ( | QPainter * | painter,
|  | QwtScaleDraw::Alignment | align,
|  | const QRect & | rect |
| ) |  |  | const

Rotate and paint a title according to its position into a given rectangle.

Parameters:

  | painter | Painter
  | align | Alignment
  | rect | Bounding rectangle

int QwtScaleWidget::endBorderDist | ( |  | ) | const

Returns:
  end border distance

See also:
  setBorderDist()

void QwtScaleWidget::getBorderDistHint | ( | int & | start,
|  | int & | end |
| ) |  |  | const

Calculate a hint for the border distances.

This member function calculates the distance of the scale's endpoints from the widget borders which is required for the mark labels to fit into the widget. The maximum of this distance an the minimum border distance is returned.

Warning:
  - The minimum border distance depends on the font.

See also:
  setMinBorderDist(), getMinBorderDist(), setBorderDist()

void QwtScaleWidget::getMinBorderDist | ( | int & | start,
|  | int & | end |
| ) |  |  | const

Get the minimum value for the distances of the scale's endpoints from the widget borders.

See also:
  setMinBorderDist(), getBorderDistHint()

void QwtScaleWidget::layoutScale | ( | bool | update = `true` | ) | `[protected]`

Recalculate the scale's geometry and layout based on.

int QwtScaleWidget::margin | ( |  | ) | const

Returns:
  margin

See also:
  setMargin()

QSize QwtScaleWidget::minimumSizeHint | ( |  | ) | const`[virtual]`

Returns:
  a minimum size hint

void QwtScaleWidget::paintEvent | ( | QPaintEvent * | e | ) | `[protected, virtual]`

paintEvent

int QwtScaleWidget::penWidth | ( |  | ) | const

Returns:
  Scale pen width

See also:
  setPenWidth()

void QwtScaleWidget::resizeEvent | ( | QResizeEvent * | e | ) | `[protected, virtual]`

resizeEvent

void QwtScaleWidget::scaleChange | ( |  | ) | `[protected]`

Notify a change of the scale.

This virtual function can be overloaded by derived classes. The default implementation updates the geometry and repaints the widget.

void QwtScaleWidget::scaleDivChanged | ( |  | ) | `[signal]`

Signal emitted, whenever the scale divison changes.

QwtScaleDraw * QwtScaleWidget::scaleDraw | ( |  | ) |

scaleDraw of this scale

See also:
  QwtScaleDraw::setScaleDraw()

const QwtScaleDraw * QwtScaleWidget::scaleDraw | ( |  | ) | const

scaleDraw of this scale

See also:
  setScaleDraw(), QwtScaleDraw::setScaleDraw()

void QwtScaleWidget::setAlignment | ( | QwtScaleDraw::Alignment | alignment | ) |

Change the alignment

Parameters:

  | alignment | New alignment

See also:
  alignment()

void QwtScaleWidget::setBorderDist | ( | int | dist1,
|  | int | dist2 |
| ) |  |  |

Specify distances of the scale's endpoints from the widget's borders. The actual borders will never be less than minimum border distance.

Parameters:

  | dist1 | Left or top Distance
  | dist2 | Right or bottom distance

See also:
  borderDist()

void QwtScaleWidget::setLabelAlignment | ( | Qt::Alignment | alignment | ) |

Change the alignment for the labels.

See also:
  QwtScaleDraw::setLabelAlignment(), setLabelRotation()

void QwtScaleWidget::setLabelRotation | ( | double | rotation | ) |

Change the rotation for the labels. See QwtScaleDraw::setLabelRotation().

Parameters:

  | rotation | Rotation

See also:
  QwtScaleDraw::setLabelRotation(), setLabelFlags()

void QwtScaleWidget::setMargin | ( | int | margin | ) |

Specify the margin to the colorBar/base line.

Parameters:

  | margin | Margin

See also:
  margin()

void QwtScaleWidget::setMinBorderDist | ( | int | start,
|  | int | end |
| ) |  |  |

Set a minimum value for the distances of the scale's endpoints from the widget borders. This is useful to avoid that the scales are "jumping", when the tick labels or their positions change often.

Parameters:

  | start | Minimum for the start border
  | end | Minimum for the end border

See also:
  getMinBorderDist(), getBorderDistHint()

void QwtScaleWidget::setPenWidth | ( | int | width | ) |

Specify the width of the scale pen.

Parameters:

  | width | Pen width

See also:
  penWidth()

void QwtScaleWidget::setScaleDiv | ( | QwtScaleTransformation * | transformation,
|  | const QwtScaleDiv & | scaleDiv |
| ) |  |  |

Assign a scale division.

The scale division determines where to set the tick marks.

Parameters:

  | transformation | Transformation, needed to translate between scale and pixal values
  | scaleDiv | Scale Division

See also:
  For more information about scale divisions, see QwtScaleDiv.

void QwtScaleWidget::setScaleDraw | ( | QwtScaleDraw * | sd | ) |

Set a scale draw sd has to be created with new and will be deleted in ~QwtScaleWidget() or the next call of setScaleDraw().

Parameters:

  | sd | ScaleDraw object

See also:
  scaleDraw()

void QwtScaleWidget::setSpacing | ( | int | spacing | ) |

Specify the distance between color bar, scale and title.

Parameters:

  | spacing | Spacing

See also:
  spacing()

void QwtScaleWidget::setTitle | ( | const QwtText & | title | ) |

Give title new text contents

Parameters:

  | title | New title

See also:
  title()

Warning:
  The title flags are interpreted in direction of the label, AlignTop, AlignBottom can't be set as the title will always be aligned to the scale.

void QwtScaleWidget::setTitle | ( | const QString & | title | ) |

Give title new text contents

Parameters:

  | title | New title

See also:
  title(), setTitle(const QwtText &);

QSize QwtScaleWidget::sizeHint | ( |  | ) | const`[virtual]`

Returns:
  a size hint

int QwtScaleWidget::spacing | ( |  | ) | const

Returns:
  distance between scale and title

See also:
  setMargin()

int QwtScaleWidget::startBorderDist | ( |  | ) | const

Returns:
  start border distance

See also:
  setBorderDist()

QwtText QwtScaleWidget::title | ( |  | ) | const

Returns:
  title

See also:
  setTitle()

int QwtScaleWidget::titleHeightForWidth | ( | int | width | ) | const

Find the height of the title for a given width.

Parameters:

  | width | Width

Returns:
  height Height