A class for drawing scales.  
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#include <qwt_scale_draw.h>
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. 
Alignment of the scale draw 
- See also
- setAlignment(), alignment() 
| 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. 
 
 
Return alignment of the scale 
- See also
- setAlignment() 
- Returns
- Alignment of the scale 
 
 
      
        
          | 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
- 
  
    | font | Font used for painting |  | value | Value |  
 
- Returns
- Bounding rectangle 
- See also
- labelRect() 
 
 
  
  | 
        
          | void QwtScaleDraw::drawBackbone | ( | QPainter * | painter | ) | const |  | protectedvirtual | 
 
 
  
  | 
        
          | void QwtScaleDraw::drawLabel | ( | QPainter * | painter, |  
          |  |  | double | value |  
          |  | ) |  | const |  | protectedvirtual | 
 
 
  
  | 
        
          | void QwtScaleDraw::drawTick | ( | QPainter * | painter, |  
          |  |  | double | value, |  
          |  |  | double | len |  
          |  | ) |  | const |  | protectedvirtual | 
 
 
  
  | 
        
          | 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
- 
  
    | font | Font used for painting the labels |  
 
- Returns
- Extent
- 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 | ( |  | ) | const | 
      
 
 
      
        
          | 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
- Position, where to paint a label 
 
 
      
        
          | 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
- 
  
    | font | Font used for painting |  | value | Value |  
 
- Returns
- Bounding rectangle that is needed to draw a label 
 
 
      
        
          | double QwtScaleDraw::labelRotation | ( |  | ) | const | 
      
 
 
      
        
          | QSizeF QwtScaleDraw::labelSize | ( | const QFont & | font, | 
        
          |  |  | double | value | 
        
          |  | ) |  | const | 
      
 
Calculate the size that is needed to draw a label
- Parameters
- 
  
    | font | Label font |  | value | Value |  
 
- Returns
- Size that is needed to draw a label 
 
 
  
  | 
        
          | 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
- 
  
    | pos | Position where to paint the label |  | size | Size of the label |  
 
- Returns
- Transformation matrix 
- See also
- setLabelAlignment(), setLabelRotation() 
 
 
      
        
          | double QwtScaleDraw::length | ( |  | ) | const | 
      
 
 
      
        
          | int QwtScaleDraw::maxLabelHeight | ( | const QFont & | font | ) | const | 
      
 
- Parameters
- 
  
  
- Returns
- the maximum height of a label 
 
 
      
        
          | int QwtScaleDraw::maxLabelWidth | ( | const QFont & | font | ) | const | 
      
 
- Parameters
- 
  
  
- Returns
- the maximum width of a label 
 
 
      
        
          | 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
- The maximum width of a label
- See also
- getBorderDistHint() 
 
 
      
        
          | int QwtScaleDraw::minLength | ( | const QFont & | font | ) | const | 
      
 
Calculate the minimum length that is needed to draw the scale
- Parameters
- 
  
    | font | Font used for painting the labels |  
 
- Returns
- Minimum length that is needed to draw the scale
- See also
- extent() 
 
 
  
  | 
        
          | void QwtScaleDraw::move | ( | double | x, |  
          |  |  | double | y |  
          |  | ) |  |  |  | inline | 
 
 
      
        
          | 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
- 
  
  
- See also
- pos(), setLength() 
 
 
      
        
          | Qt::Orientation QwtScaleDraw::orientation | ( |  | ) | const | 
      
 
Return the orientation
TopScale, BottomScale are horizontal (Qt::Horizontal) scales, LeftScale, RightScale are vertical (Qt::Vertical) scales.
- Returns
- Orientation of the scale
- See also
- alignment() 
 
 
      
        
          | QPointF QwtScaleDraw::pos | ( |  | ) | const | 
      
 
 
      
        
          | void QwtScaleDraw::setAlignment | ( | Alignment | align | ) |  | 
      
 
 
      
        
          | 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\n
QwtScaleDraw::BottomScale: Qt::AlignHCenter | Qt::AlignBottom\n
QwtScaleDraw::LeftScale: Qt::AlignLeft | Qt::AlignVCenter\n
QwtScaleDraw::RightScale: Qt::AlignRight | Qt::AlignVCenter\n
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 | ( | double | length | ) |  | 
      
 
Set the length of the backbone.
The length doesn't include the space needed for overlapping labels.
- Parameters
- 
  
    | length | Length of the backbone |  
 
- See also
- move(), minLabelDist()