conflicting packages
QwtAbstractScaleDraw(3) | Qwt User's Guide | QwtAbstractScaleDraw(3) |
NAME¶
QwtAbstractScaleDraw -SYNOPSIS¶
#include <qwt_abstract_scale_draw.h> Inherited by QwtRoundScaleDraw, and QwtScaleDraw.Public Types¶
enum ScaleComponent { Backbone = 1, Ticks = 2, Labels = 4 }
Public Member Functions¶
QwtAbstractScaleDraw ()
Protected Member Functions¶
virtual void drawBackbone (QPainter *painter) const =0
Detailed Description¶
A abstract base class for drawing scales. QwtAbstractScaleDraw can be used to draw linear or logarithmic scales. 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 QwtAbstractScaleDraw::ScaleComponent¶
Components of a scale- •
- Backbone
- •
- Ticks
- •
- Labels
enableComponent(), hasComponent
Constructor & Destructor Documentation¶
QwtAbstractScaleDraw::QwtAbstractScaleDraw ()¶
Constructor. The range of the scale is initialized to [0, 100], The spacing (distance between ticks and labels) is set to 4, the tick lengths are set to 4,6 and 8 pixelsMember Function Documentation¶
void QwtAbstractScaleDraw::draw (QPainter *painter, const QPalette &palette) const [virtual]¶
Draw the scale. Parameters:painter The painter
palette Palette, text color is used for the labels, foreground color for
ticks and backbone
virtual void QwtAbstractScaleDraw::drawBackbone (QPainter *painter) const [protected], [pure virtual]¶
Draws the baseline of the scale Parameters:painter Painter
See also:
drawTick(), drawLabel()
Implemented in QwtScaleDraw, and QwtRoundScaleDraw.
virtual void QwtAbstractScaleDraw::drawLabel (QPainter *painter, doublevalue) const [protected], [pure virtual]¶
Draws the label for a major scale tick Parameters:painter Painter
value Value
See also:
drawTick, drawBackbone
Implemented in QwtScaleDraw, and QwtRoundScaleDraw.
virtual void QwtAbstractScaleDraw::drawTick (QPainter *painter, doublevalue, intlen) const [protected], [pure virtual]¶
Draw a tick Parameters:painter Painter
value Value of the tick
len Length of the tick
See also:
drawBackbone(), drawLabel()
Implemented in QwtScaleDraw, and QwtRoundScaleDraw.
void QwtAbstractScaleDraw::enableComponent ( ScaleComponentcomponent, boolenable = true)¶
En/Disable a component of the scale Parameters:component Scale component
enable On/Off
See also:
hasComponent()
virtual int QwtAbstractScaleDraw::extent (const QPen &, const QFont &) const [pure virtual]¶
Calculate the extent The extent is the distcance from the baseline to the outermost pixel of the scale draw in opposite to its orientation. It is at least minimumExtent() pixels. See also:setMinimumExtent(), minimumExtent()
Implemented in QwtRoundScaleDraw, and QwtScaleDraw.
bool QwtAbstractScaleDraw::hasComponent ( ScaleComponentcomponent) const¶
Check if a component is enabled See also:enableComponent()
void QwtAbstractScaleDraw::invalidateCache () [protected]¶
Invalidate the cache used by QwtAbstractScaleDraw::tickLabel 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.QwtText QwtAbstractScaleDraw::label (doublevalue) const [virtual]¶
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.
int QwtAbstractScaleDraw::majTickLength () const¶
The same as QwtAbstractScaleDraw::tickLength(QwtScaleDiv::MajorTick).const QwtScaleMap & QwtAbstractScaleDraw::map () const¶
Returns:Map how to translate between scale and pixel values
int QwtAbstractScaleDraw::minimumExtent () const¶
Get the minimum extent See also:extent(), setMinimumExtent()
const QwtScaleDiv & QwtAbstractScaleDraw::scaleDiv () const¶
Returns:scale division
QwtScaleMap & QwtAbstractScaleDraw::scaleMap ()¶
Returns:Map how to translate between scale and pixel values
void QwtAbstractScaleDraw::setMinimumExtent (intminExtent)¶
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()
void QwtAbstractScaleDraw::setScaleDiv (const QwtScaleDiv &sd)¶
Change the scale division Parameters:sd New scale division
void QwtAbstractScaleDraw::setSpacing (intspacing)¶
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()
void QwtAbstractScaleDraw::setTickLength ( QwtScaleDiv::TickTypetickType, intlength)¶
Set the length of the ticks Parameters:tickType Tick type
length New length
Warning:
the length is limited to [0..1000]
void QwtAbstractScaleDraw::setTransformation ( QwtScaleTransformation *transformation)¶
Change the transformation of the scale Parameters:transformation New scale transformation
int QwtAbstractScaleDraw::spacing () const¶
Get the spacing. The spacing is the distance between ticks and labels. The default spacing is 4 pixels. See also:setSpacing()
const QwtText & QwtAbstractScaleDraw::tickLabel (const QFont &font, doublevalue) const [protected]¶
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
int QwtAbstractScaleDraw::tickLength ( QwtScaleDiv::TickTypetickType) const¶
Return the length of the ticks See also:setTickLength(), majTickLength()
Author¶
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