qwtscalemap(3) [debian man page]
QwtScaleMap(3) Qwt User's Guide QwtScaleMap(3) NAME
QwtScaleMap - A scale map. SYNOPSIS
#include <qwt_scale_map.h> Public Member Functions double invTransform (double i) const QwtScaleMap & operator= (const QwtScaleMap &) double p1 () const double p2 () const double pDist () const QwtScaleMap (const QwtScaleMap &) QwtScaleMap () double s1 () const double s2 () const double sDist () const void setPaintInterval (int p1, int p2) void setPaintXInterval (double p1, double p2) void setScaleInterval (double s1, double s2) void setTransformation (QwtScaleTransformation *) int transform (double x) const const QwtScaleTransformation * transformation () const double xTransform (double x) const ~QwtScaleMap () Public Attributes QT_STATIC_CONST double LogMax = 1.0e150 QT_STATIC_CONST double LogMin = 1.0e-150 Detailed Description A scale map. QwtScaleMap offers transformations from a scale into a paint interval and vice versa. Constructor &; Destructor Documentation QwtScaleMap::QwtScaleMap () Constructor. The scale and paint device intervals are both set to [0,1]. QwtScaleMap::QwtScaleMap (const QwtScaleMap &other) Copy constructor. QwtScaleMap::~QwtScaleMap () Destructor Member Function Documentation double QwtScaleMap::invTransform (doublep) const [inline] Transform an paint device value into a value in the interval of the scale. Parameters: p Value relative to the coordinates of the paint device See also: transform() QwtScaleMap & QwtScaleMap::operator= (const QwtScaleMap &other) Assignment operator. double QwtScaleMap::p1 () const [inline] Returns: First border of the paint interval double QwtScaleMap::p2 () const [inline] Returns: Second border of the paint interval double QwtScaleMap::pDist () const [inline] Returns: qwtAbs(p2() - p1()) double QwtScaleMap::s1 () const [inline] Returns: First border of the scale interval double QwtScaleMap::s2 () const [inline] Returns: Second border of the scale interval double QwtScaleMap::sDist () const [inline] Returns: qwtAbs(s2() - s1()) void QwtScaleMap::setPaintInterval (intp1, intp2) Specify the borders of the paint device interval. Parameters: p1 first border p2 second border void QwtScaleMap::setPaintXInterval (doublep1, doublep2) Specify the borders of the paint device interval. Parameters: p1 first border p2 second border void QwtScaleMap::setScaleInterval (doubles1, doubles2) Specify the borders of the scale interval. Parameters: s1 first border s2 second border Warning: logarithmic scales might be aligned to [LogMin, LogMax] void QwtScaleMap::setTransformation (QwtScaleTransformation *transformation) Initialize the map with a transformation int QwtScaleMap::transform (doubles) const [inline] Transform a point related to the scale interval into an point related to the interval of the paint device and round it to an integer. (In Qt <= 3.x paint devices are integer based. ) Parameters: s Value relative to the coordinates of the scale See also: xTransform() const QwtScaleTransformation * QwtScaleMap::transformation () const Get the transformation. double QwtScaleMap::xTransform (doubles) const [inline] Transform a point related to the scale interval into an point related to the interval of the paint device Parameters: s Value relative to the coordinates of the scale Author Generated automatically by Doxygen for Qwt User's Guide from the source code. Version 5.2.2 Mon Aug 1 2011 QwtScaleMap(3)
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QwtPlotHistogram(3) Qwt User's Guide QwtPlotHistogram(3) NAME
QwtPlotHistogram - QwtPlotHistogram represents a series of samples, where an interval is associated with a value ( $y = f([x1,x2])$ ). SYNOPSIS
#include <qwt_plot_histogram.h> Inherits QwtPlotSeriesItem< QwtIntervalSample >. Public Types enum HistogramStyle { Outline, Columns, Lines, UserStyle = 100 } Public Member Functions QwtPlotHistogram (const QString &title=QString::null) QwtPlotHistogram (const QwtText &title) virtual ~QwtPlotHistogram () virtual int rtti () const void setPen (const QPen &) const QPen & pen () const void setBrush (const QBrush &) const QBrush & brush () const void setSamples (const QVector< QwtIntervalSample > &) void setBaseline (double reference) double baseline () const void setStyle (HistogramStyle style) HistogramStyle style () const void setSymbol (const QwtColumnSymbol *) const QwtColumnSymbol * symbol () const virtual void drawSeries (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, int from, int to) const virtual QRectF boundingRect () const virtual void drawLegendIdentifier (QPainter *, const QRectF &) const Protected Member Functions virtual QwtColumnRect columnRect (const QwtIntervalSample &, const QwtScaleMap &, const QwtScaleMap &) const virtual void drawColumn (QPainter *, const QwtColumnRect &, const QwtIntervalSample &) const void drawColumns (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, int from, int to) const void drawOutline (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, int from, int to) const void drawLines (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, int from, int to) const Detailed Description QwtPlotHistogram represents a series of samples, where an interval is associated with a value ( $y = f([x1,x2])$ ). The representation depends on the style() and an optional symbol() that is displayed for each interval. Note: The term 'histogram' is used in a different way in the areas of digital image processing and statistics. Wikipedia introduces the terms 'image histogram' and 'color histogram' to avoid confusions. While 'image histograms' can be displayed by a QwtPlotCurve there is no applicable plot item for a 'color histogram' yet. Member Enumeration Documentation enum QwtPlotHistogram::HistogramStyle Histogram styles. The default style is QwtPlotHistogram::Columns. See also: setStyle(), style(), setSymbol(), symbol(), setBaseline() Enumerator: Outline Draw an outline around the area, that is build by all intervals using the pen() and fill it with the brush(). The outline style requires, that the intervals are in increasing order and not overlapping. Columns Draw a column for each interval. When a symbol() has been set the symbol is used otherwise the column is displayed as plain rectangle using pen() and brush(). Lines Draw a simple line using the pen() for each interval. UserStyle Styles >= UserStyle are reserved for derived classes that overload drawSeries() with additional application specific ways to display a histogram. Constructor &; Destructor Documentation QwtPlotHistogram::QwtPlotHistogram (const QString &title = QString::null) [explicit] Constructor Parameters: title Title of the histogram. QwtPlotHistogram::QwtPlotHistogram (const QwtText &title) [explicit] Constructor Parameters: title Title of the histogram. QwtPlotHistogram::~QwtPlotHistogram () [virtual] Destructor. Member Function Documentation double QwtPlotHistogram::baseline () const Returns: Value of the baseline See also: setBaseline() QRectF QwtPlotHistogram::boundingRect () const [virtual] Returns: Bounding rectangle of all samples. For an empty series the rectangle is invalid. Reimplemented from QwtPlotSeriesItem< QwtIntervalSample >. const QBrush & QwtPlotHistogram::brush () const Returns: Brush used in a style() depending way. See also: setPen(), brush() QwtColumnRect QwtPlotHistogram::columnRect (const QwtIntervalSample &sample, const QwtScaleMap &xMap, const QwtScaleMap &yMap) const [protected, virtual] Calculate the area that is covered by a sample Parameters: sample Sample xMap Maps x-values into pixel coordinates. yMap Maps y-values into pixel coordinates. Returns: Rectangle, that is covered by a sample void QwtPlotHistogram::drawColumn (QPainter *painter, const QwtColumnRect &rect, const QwtIntervalSample &sample) const [protected, virtual] Draw a column for a sample in Columns style(). When a symbol() has been set the symbol is used otherwise the column is displayed as plain rectangle using pen() and brush(). Parameters: painter Painter rect Rectangle where to paint the column in paint device coordinates sample Sample to be displayed Note: In applications, where different intervals need to be displayed in a different way ( f.e different colors or even using differnt symbols) it is recommended to overload drawColumn(). void QwtPlotHistogram::drawColumns (QPainter *painter, const QwtScaleMap &xMap, const QwtScaleMap &yMap, intfrom, intto) const [protected] Draw a histogram in Columns style() Parameters: painter Painter xMap Maps x-values into pixel coordinates. yMap Maps y-values into pixel coordinates. from Index of the first sample to be painted to Index of the last sample to be painted. If to < 0 the histogram will be painted to its last point. See also: setStyle(), style(), setSymbol(), drawColumn() void QwtPlotHistogram::drawLegendIdentifier (QPainter *painter, const QRectF &rect) const [virtual] Draw a plain rectangle without pen using the brush() as identifier Parameters: painter Painter rect Bounding rectangle for the identifier Reimplemented from QwtLegendItemManager. void QwtPlotHistogram::drawLines (QPainter *painter, const QwtScaleMap &xMap, const QwtScaleMap &yMap, intfrom, intto) const [protected] Draw a histogram in Lines style() Parameters: painter Painter xMap Maps x-values into pixel coordinates. yMap Maps y-values into pixel coordinates. from Index of the first sample to be painted to Index of the last sample to be painted. If to < 0 the histogram will be painted to its last point. See also: setStyle(), style(), setPen() void QwtPlotHistogram::drawOutline (QPainter *painter, const QwtScaleMap &xMap, const QwtScaleMap &yMap, intfrom, intto) const [protected] Draw a histogram in Outline style() Parameters: painter Painter xMap Maps x-values into pixel coordinates. yMap Maps y-values into pixel coordinates. from Index of the first sample to be painted to Index of the last sample to be painted. If to < 0 the histogram will be painted to its last point. See also: setStyle(), style() Warning: The outline style requires, that the intervals are in increasing order and not overlapping. void QwtPlotHistogram::drawSeries (QPainter *painter, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, intfrom, intto) const [virtual] Draw a subset of the histogram 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: drawOutline(), drawLines(), drawColumns Implements QwtPlotAbstractSeriesItem. const QPen & QwtPlotHistogram::pen () const Returns: Pen used in a style() depending way. See also: setPen(), brush() int QwtPlotHistogram::rtti () const [virtual] Returns: QwtPlotItem::Rtti_PlotHistogram Reimplemented from QwtPlotItem. void QwtPlotHistogram::setBaseline (doublevalue) Set the value of the baseline. Each column representing an QwtIntervalSample is defined by its interval and the interval between baseline and the value of the sample. The default value of the baseline is 0.0. Parameters: value Value of the baseline See also: baseline() void QwtPlotHistogram::setBrush (const QBrush &brush) Assign a brush, that is used in a style() depending way. Parameters: brush New brush See also: pen(), brush() void QwtPlotHistogram::setPen (const QPen &pen) Assign a pen, that is used in a style() depending way. Parameters: pen New pen See also: pen(), brush() void QwtPlotHistogram::setSamples (const QVector< QwtIntervalSample > &samples) Initialize data with an array of samples. Parameters: samples Vector of points void QwtPlotHistogram::setStyle (HistogramStylestyle) Set the histogram's drawing style Parameters: style Histogram style See also: HistogramStyle, style() void QwtPlotHistogram::setSymbol (const QwtColumnSymbol *symbol) Assign a symbol. In Column style an optional symbol can be assigned, that is responsible for displaying the rectangle that is defined by the interval and the distance between baseline() and value. When no symbol has been defined the area is displayed as plain rectangle using pen() and brush(). See also: style(), symbol(), drawColumn(), pen(), brush() Note: In applications, where different intervals need to be displayed in a different way ( f.e different colors or even using differnt symbols) it is recommended to overload drawColumn(). QwtPlotHistogram::HistogramStyle QwtPlotHistogram::style () const Return the current style See also: HistogramStyle, setStyle() const QwtColumnSymbol * QwtPlotHistogram::symbol () const Returns: Current symbol or NULL, when no symbol has been assigned See also: setSymbol() Author Generated automatically by Doxygen for Qwt User's Guide from the source code. Version 6.0.0 Fri Apr 15 2011 QwtPlotHistogram(3)