| QwtPlotIntervalCurve(3) | Qwt User's Guide | QwtPlotIntervalCurve(3) |
NAME¶
QwtPlotIntervalCurve - QwtPlotIntervalCurve represents a series of samples, where each value is associated with an interval ( $[y1,y2] = f(x)$ ).SYNOPSIS¶
#include <qwt_plot_intervalcurve.h> Inherits QwtPlotSeriesItem< QwtIntervalSample >.Public Types¶
enum CurveStyle { NoCurve, Tube, UserCurve = 100 }
Public Member Functions¶
QwtPlotIntervalCurve (const QString &title=QString::null)
Protected Member Functions¶
void init ()
Detailed Description¶
QwtPlotIntervalCurve represents a series of samples, where each value is associated with an interval ( $[y1,y2] = f(x)$ ). The representation depends on the style() and an optional symbol() that is displayed for each interval. QwtPlotIntervalCurve might be used to disply error bars or the area between 2 curves.Member Typedef Documentation¶
typedef QFlags< PaintAttribute> QwtPlotIntervalCurve::PaintAttributes¶
Paint attributes.Member Enumeration Documentation¶
enum QwtPlotIntervalCurve::CurveStyle¶
Curve styles. The default setting is QwtPlotIntervalCurve::Tube. See also:setStyle(), style()
Enumerator:
- NoCurve
- Don't draw a curve. Note: This doesn't affect the symbols.
- Tube
- Build 2 curves from the upper and lower limits of the intervals and draw them with the pen(). The area between the curves is filled with the brush().
- UserCurve
- Styles >= QwtPlotIntervalCurve::UserCurve are reserved for derived classes that overload drawSeries() with additional application specific curve types.
enum QwtPlotIntervalCurve::PaintAttribute Attributes to modify the drawing algorithm.¶
See also:setPaintAttribute(),
testPaintAttribute()
Enumerator:
- ClipPolygons
- Clip polygons before painting them. In situations, where points are far outside the visible area (f.e when zooming deep) this might be a substantial improvement for the painting performance.
- ClipSymbol
- Check if a symbol is on the plot canvas before painting it.
Constructor & Destructor Documentation¶
QwtPlotIntervalCurve::QwtPlotIntervalCurve (const QString &title = QString::null) [explicit] Constructor¶
Parameters:title Title of the curve
QwtPlotIntervalCurve::QwtPlotIntervalCurve (const QwtText &title) [explicit] Constructor¶
Parameters:title Title of the curve
QwtPlotIntervalCurve::~QwtPlotIntervalCurve () [virtual]¶
Destructor.Member Function Documentation¶
QRectF QwtPlotIntervalCurve::boundingRect () const [virtual] Returns:¶
Bounding rectangle of all samples. For an empty series
the rectangle is invalid.
Reimplemented from QwtPlotSeriesItem< QwtIntervalSample >.
const QBrush & QwtPlotIntervalCurve::brush () const Returns:¶
Brush used to fill the area in Tube style()
See also:
setBrush(), setStyle(),
CurveStyle
void QwtPlotIntervalCurve::drawLegendIdentifier (QPainter *painter, const QRectF &rect) const [virtual] In case of Tibe stale() a plain rectangle is painted without a pen filled the brush(). If a symbol is assigned it is painted cebtered into rect.¶
Parameters:painter Painter
rect Bounding rectangle for the identifier
Reimplemented from QwtLegendItemManager.
void QwtPlotIntervalCurve::drawSeries (QPainter *painter, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, intfrom, intto) const [virtual] Draw a subset of the samples¶
Parameters:painter Painter
xMap Maps x-values into pixel coordinates.
yMap Maps y-values into pixel coordinates.
canvasRect Contents rect of the canvas
from Index of the first sample to be painted
to Index of the last sample to be painted. If to < 0 the series will
be painted to its last sample.
See also:
drawTube(), drawSymbols()
Implements QwtPlotAbstractSeriesItem.
void QwtPlotIntervalCurve::drawSymbols (QPainter *painter, const QwtIntervalSymbol &symbol, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, intfrom, intto) const [protected, virtual] Draw symbols for a subset of the samples¶
Parameters:painter Painter
symbol Interval symbol
xMap x map
yMap y map
canvasRect Contents rect of the canvas
from Index of the first sample to be painted
to Index of the last sample to be painted
See also:
setSymbol(), drawSeries(),
drawTube()
void QwtPlotIntervalCurve::drawTube (QPainter *painter, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, intfrom, intto) const [protected, virtual] Draw a tube¶
Builds 2 curves from the upper and lower limits of the intervals and draws them with the pen(). The area between the curves is filled with the brush(). Parameters:painter Painter
xMap Maps x-values into pixel coordinates.
yMap Maps y-values into pixel coordinates.
canvasRect Contents rect of the canvas
from Index of the first sample to be painted
to Index of the last sample to be painted. If to < 0 the series will
be painted to its last sample.
See also:
drawSeries(), drawSymbols()
void QwtPlotIntervalCurve::init () [protected]¶
Initialize internal members.const QPen & QwtPlotIntervalCurve::pen () const¶
Return the pen used to draw the lines. See also:setPen(), brush()
int QwtPlotIntervalCurve::rtti () const [virtual] Returns:¶
QwtPlotItem::Rtti_PlotIntervalCurve
Reimplemented from QwtPlotItem.
void QwtPlotIntervalCurve::setBrush (const QBrush &brush) Assign a brush.¶
The brush is used to fill the area in Tube style(). Parameters:brush Brush
See also:
brush(), pen(), setStyle(),
CurveStyle
void QwtPlotIntervalCurve::setPaintAttribute ( PaintAttributeattribute, boolon = true) Specify an attribute how to draw the curve¶
Parameters:attribute Paint attribute
on On/Off
See also:
testPaintAttribute()
void QwtPlotIntervalCurve::setPen (const QPen &pen)¶
Assign a pen. Parameters:pen New pen
See also:
pen(), brush()
void QwtPlotIntervalCurve::setSamples (const QVector< QwtIntervalSample > &samples) Initialize data with an array of samples.¶
Parameters:samples Vector of samples
void QwtPlotIntervalCurve::setStyle ( CurveStylestyle) Set the curve's drawing style¶
Parameters:style Curve style
See also:
CurveStyle, style()
void QwtPlotIntervalCurve::setSymbol (const QwtIntervalSymbol *symbol) Assign a symbol.¶
Parameters:symbol Symbol
See also:
symbol()
QwtPlotIntervalCurve::CurveStyle QwtPlotIntervalCurve::style () const¶
Return the current style. See also:setStyle()
const QwtIntervalSymbol * QwtPlotIntervalCurve::symbol () const Returns:¶
Current symbol or NULL, when no symbol has been
assigned
See also:
setSymbol()
bool QwtPlotIntervalCurve::testPaintAttribute ( PaintAttributeattribute) const¶
Return the current paint attributes. See also:PaintAttribute, setPaintAttribute()
Author¶
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