QwtRoundScaleDraw - Man Page

enum ScaleComponent { Backbone =  1, Ticks =  2, Labels =  4 }

QPoint center () const
virtual void draw (QPainter *, const QPalette &) const
void enableComponent (ScaleComponent, bool enable=true)
virtual int extent (const QPen &, const QFont &) const
bool hasComponent (ScaleComponent) const
virtual QwtText label (double) const
int majTickLength () const
const QwtScaleMap & map () const
int minimumExtent () const
void moveCenter (const QPoint &)
void moveCenter (int x, int y)
QwtRoundScaleDraw & operator= (const QwtRoundScaleDraw &other)
QwtRoundScaleDraw (const QwtRoundScaleDraw &)
QwtRoundScaleDraw ()
int radius () const
const QwtScaleDiv & scaleDiv () const
QwtScaleMap & scaleMap ()
void setAngleRange (double angle1, double angle2)
void setMinimumExtent (int)
void setRadius (int radius)
void setScaleDiv (const QwtScaleDiv &s)
void setSpacing (int margin)
void setTickLength (QwtScaleDiv::TickType, int length)
void setTransformation (QwtScaleTransformation *)
int spacing () const
int tickLength (QwtScaleDiv::TickType) const
virtual ~QwtRoundScaleDraw ()

virtual void drawBackbone (QPainter *p) const
virtual void drawLabel (QPainter *p, double val) const
virtual void drawTick (QPainter *p, double val, int len) const
void invalidateCache ()
const QwtText & tickLabel (const QFont &, double value) const

• Backbone
• Ticks
• Labels

See also:

Constructor. The range of the scale is initialized to [0, 100], The center is set to (50, 50) with a radius of 50. The angle range is set to [-135, 135].

Copy constructor.

Destructor.

Get the center of the scale.

Draw the scale. Parameters:

Parameters:

painter Painter

See also:

drawTick(), drawLabel()

Implements QwtAbstractScaleDraw.

Parameters:

painter Painter
value Value

See also:

drawTick(), drawBackbone()

Implements QwtAbstractScaleDraw.

Parameters:

painter Painter
value Value of the tick
len Lenght of the tick

See also:

drawBackbone(), drawLabel()

Implements QwtAbstractScaleDraw.

Parameters:

component Scale component
enable On/Off

See also:

hasComponent()

The extent is the distcance between the baseline to the outermost pixel of the scale draw. radius() + extent() is an upper limit for the radius of the bounding circle.

Parameters:

pen Pen that is used for painting backbone and ticks
font Font used for painting the labels

See also:

setMinimumExtent(), minimumExtent()

Warning:

The implemented algo is not too smart and calculates only an upper limit, that might be a few pixels too large

Implements QwtAbstractScaleDraw.

See also:

The cache is invalidated, when a new QwtScaleDiv is set. If the labels need to be changed. while the same QwtScaleDiv is set, QwtAbstractScaleDraw::invalidateCache needs to be called manually.

Convert a value into its representing label. The value is converted to a plain text using QLocale::system().toString(value). This method is often overloaded by applications to have individual labels.

Parameters:

value Value

Returns:

Label string.

Reimplemented in QwtDialScaleDraw.

See also:

Parameters:

center New center

See also:

setRadius()

Move the center of the scale draw, leaving the radius unchanged.

Assignment operator.

Radius is the radius of the backbone without ticks and labels.

See also:

Adjust the baseline circle segment for round scales. The baseline will be drawn from min(angle1,angle2) to max(angle1, angle2). The default setting is [ -135, 135 ]. An angle of 0 degrees corresponds to the 12 o'clock position, and positive angles count in a clockwise direction.

Parameters:

angle1
angle2 boundaries of the angle interval in degrees.

Warning:

• The angle range is limited to [-360, 360] degrees. Angles exceeding this range will be clipped.
• For angles more than 359 degrees above or below min(angle1, angle2), scale marks will not be drawn.
• If you need a counterclockwise scale, use QwtScaleDiv::setRange

Set a minimum for the extent. The extent is calculated from the coomponents of the scale draw. In situations, where the labels are changing and the layout depends on the extent (f.e scrolling a scale), setting an upper limit as minimum extent will avoid jumps of the layout.

Parameters:

minExtent Minimum extent

See also:

extent(), minimumExtent()

Radius is the radius of the backbone without ticks and labels.

Parameters:

radius New Radius

See also:

moveCenter()

Parameters:

sd New scale division

Set the spacing between tick and labels. The spacing is the distance between ticks and labels. The default spacing is 4 pixels.

Parameters:

spacing Spacing

See also:

spacing()

Parameters:

tickType Tick type
length New length

Warning:

the length is limited to [0..1000]

Parameters:

transformation New scale transformation

Get the spacing. The spacing is the distance between ticks and labels. The default spacing is 4 pixels.

See also:

Convert a value into its representing label and cache it. The conversion between value and label is called very often in the layout and painting code. Unfortunately the calculation of the label sizes might be slow (really slow for rich text in Qt4), so it's necessary to cache the labels.

Parameters:

font Font
value Value

Returns:

Tick label

See also: