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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QwtPlotItem(3) Qwt User's Guide QwtPlotItem(3) NAME
QwtPlotItem - Base class for items on the plot canvas. SYNOPSIS
#include <qwt_plot_item.h> Inherits QwtLegendItemManager. Inherited by QwtPlotCurve, QwtPlotGrid, QwtPlotMarker, QwtPlotRasterItem, QwtPlotScaleItem, and QwtPlotSvgItem. Public Types enum ItemAttribute { Legend = 1, AutoScale = 2 } enum RenderHint { RenderAntialiased = 1 } enum RttiValues { Rtti_PlotItem = 0, Rtti_PlotGrid, Rtti_PlotScale, Rtti_PlotMarker, Rtti_PlotCurve, Rtti_PlotHistogram, Rtti_PlotSpectrogram, Rtti_PlotSVG, Rtti_PlotUserItem = 1000 } Public Member Functions void attach (QwtPlot *plot) virtual QwtDoubleRect boundingRect () const void detach () virtual void draw (QPainter *painter, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRect &canvasRect) const =0 void hide () QwtDoubleRect invTransform (const QwtScaleMap &, const QwtScaleMap &, const QRect &) const bool isVisible () const virtual void itemChanged () virtual QWidget * legendItem () const QRect paintRect (const QwtScaleMap &, const QwtScaleMap &) const QwtPlot * plot () const QwtPlotItem (const QwtText &title=QwtText()) virtual int rtti () const QwtDoubleRect scaleRect (const QwtScaleMap &, const QwtScaleMap &) const void setAxis (int xAxis, int yAxis) void setItemAttribute (ItemAttribute, bool on=true) void setRenderHint (RenderHint, bool on=true) void setTitle (const QwtText &title) void setTitle (const QString &title) virtual void setVisible (bool) void setXAxis (int axis) void setYAxis (int axis) void setZ (double z) void show () bool testItemAttribute (ItemAttribute) const bool testRenderHint (RenderHint) const const QwtText & title () const QRect transform (const QwtScaleMap &, const QwtScaleMap &, const QwtDoubleRect &) const virtual void updateLegend (QwtLegend *) const virtual void updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &) int xAxis () const int yAxis () const double z () const virtual ~QwtPlotItem () Detailed Description Base class for items on the plot canvas. A plot item is 'something', that can be painted on the plot canvas, or only affects the scales of the plot widget. They can be categorized as: o Representator A 'Representator' is an item that represents some sort of data on the plot canvas. The different representator classes are organized according to the characteristics of the data: o QwtPlotMarker Represents a point or a horizontal/vertical coordinate o QwtPlotCurve Represents a series of points o QwtPlotSpectrogram ( QwtPlotRasterItem ) Represents raster data o o Decorators A 'Decorator' is an item, that displays additional information, that is not related to any data: o QwtPlotGrid o QwtPlotScaleItem o QwtPlotSvgItem o Depending on the QwtPlotItem::ItemAttribute flags, an item is included into autoscaling or has an entry on the legnd. Before misusing the existing item classes it might be better to implement a new type of plot item ( don't implement a watermark as spectrogram ). Deriving a new type of QwtPlotItem primarily means to implement the YourPlotItem::draw() method. See also: The cpuplot example shows the implementation of additional plot items. Member Enumeration Documentation enum QwtPlotItem::ItemAttribute Plot Item Attributes o Legend The item is represented on the legend. o AutoScale The boundingRect() of the item is included in the autoscaling calculation. See also: setItemAttribute(), testItemAttribute() enum QwtPlotItem::RenderHint Render hints. enum QwtPlotItem::RttiValues Runtime type information. RttiValues is used to cast plot items, without having to enable runtime type information of the compiler. Constructor &; Destructor Documentation QwtPlotItem::QwtPlotItem (const QwtText &title = QwtText()) [explicit] Constructor Parameters: title Title of the item QwtPlotItem::~QwtPlotItem () [virtual] Destroy the QwtPlotItem. Member Function Documentation void QwtPlotItem::attach (QwtPlot *plot) Attach the item to a plot. This method will attach a QwtPlotItem to the QwtPlot argument. It will first detach the QwtPlotItem from any plot from a previous call to attach (if necessary). If a NULL argument is passed, it will detach from any QwtPlot it was attached to. Parameters: plot Plot widget See also: QwtPlotItem::detach() QwtDoubleRect QwtPlotItem::boundingRect () const [virtual] Returns: An invalid bounding rect: QwtDoubleRect(1.0, 1.0, -2.0, -2.0) Reimplemented in QwtPlotCurve, QwtPlotMarker, QwtPlotSpectrogram, and QwtPlotSvgItem. void QwtPlotItem::detach () [inline] This method detaches a QwtPlotItem from any QwtPlot it has been associated with. detach() is equivalent to calling attach( NULL ) See also: attach( QwtPlot* plot ) virtual void QwtPlotItem::draw (QPainter *painter, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRect &canvasRect) const [pure virtual] Draw the item. Parameters: painter Painter xMap Maps x-values into pixel coordinates. yMap Maps y-values into pixel coordinates. canvasRect Contents rect of the canvas in painter coordinates Implemented in QwtPlotCurve, QwtPlotGrid, QwtPlotMarker, QwtPlotRasterItem, QwtPlotScaleItem, QwtPlotSpectrogram, and QwtPlotSvgItem. void QwtPlotItem::hide () Hide the item. QwtDoubleRect QwtPlotItem::invTransform (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRect &rect) const Transform a rectangle from paint to scale coordinates Parameters: xMap X map yMap Y map rect Rectangle in paint coordinates Returns: Rectangle in scale coordinates See also: transform() bool QwtPlotItem::isVisible () const Returns: true if visible See also: setVisible(), show(), hide() void QwtPlotItem::itemChanged () [virtual] Update the legend and call QwtPlot::autoRefresh for the parent plot. See also: updateLegend() QWidget * QwtPlotItem::legendItem () const [virtual] Allocate the widget that represents the item on the legend. The default implementation is made for QwtPlotCurve and returns a QwtLegendItem(), but an item could be represented by any type of widget, by overloading legendItem() and updateLegend(). Returns: QwtLegendItem() See also: updateLegend() QwtLegend() Implements QwtLegendItemManager. QRect QwtPlotItem::paintRect (const QwtScaleMap &xMap, const QwtScaleMap &yMap) const Calculate the bounding paint rect of 2 maps. Parameters: xMap X map yMap X map Returns: Bounding rect of the scale maps QwtPlot * QwtPlotItem::plot () const Return attached plot. int QwtPlotItem::rtti () const [virtual] Return rtti for the specific class represented. QwtPlotItem is simply a virtual interface class, and base classes will implement this method with specific rtti values so a user can differentiate them. The rtti value is useful for environments, where the runtime type information is disabled and it is not possible to do a dynamic_cast<...>. Returns: rtti value See also: RttiValues Reimplemented in QwtPlotCurve, QwtPlotGrid, QwtPlotMarker, QwtPlotScaleItem, QwtPlotSpectrogram, and QwtPlotSvgItem. QwtDoubleRect QwtPlotItem::scaleRect (const QwtScaleMap &xMap, const QwtScaleMap &yMap) const Calculate the bounding scale rect of 2 maps. Parameters: xMap X map yMap X map Returns: Bounding rect of the scale maps void QwtPlotItem::setAxis (intxAxis, intyAxis) Set X and Y axis The item will painted according to the coordinates its Axes. Parameters: xAxis X Axis yAxis Y Axis See also: setXAxis(), setYAxis(), xAxis(), yAxis() void QwtPlotItem::setItemAttribute (ItemAttributeattribute, boolon = true) Toggle an item attribute Parameters: attribute Attribute type on true/false See also: testItemAttribute(), ItemAttribute void QwtPlotItem::setRenderHint (RenderHinthint, boolon = true) Toggle an render hint Parameters: hint Render hint on true/false See also: testRenderHint(), RenderHint void QwtPlotItem::setTitle (const QString &title) Set a new title Parameters: title Title See also: title() void QwtPlotItem::setTitle (const QwtText &title) Set a new title Parameters: title Title See also: title() void QwtPlotItem::setVisible (boolon) [virtual] Show/Hide the item Parameters: on Show if true, otherwise hide See also: isVisible(), show(), hide() void QwtPlotItem::setXAxis (intaxis) Set the X axis The item will painted according to the coordinates its Axes. Parameters: axis X Axis See also: setAxis(), setYAxis(), xAxis() void QwtPlotItem::setYAxis (intaxis) Set the Y axis The item will painted according to the coordinates its Axes. Parameters: axis Y Axis See also: setAxis(), setXAxis(), yAxis() void QwtPlotItem::setZ (doublez) Set the z value. Plot items are painted in increasing z-order. Parameters: z Z-value See also: z(), QwtPlotDict::itemList() void QwtPlotItem::show () Show the item. bool QwtPlotItem::testItemAttribute (ItemAttributeattribute) const Test an item attribute Parameters: attribute Attribute type Returns: true/false See also: setItemAttribute(), ItemAttribute bool QwtPlotItem::testRenderHint (RenderHinthint) const Test a render hint Parameters: hint Render hint Returns: true/false See also: setRenderHint(), RenderHint const QwtText & QwtPlotItem::title () const Returns: Title of the item See also: setTitle() QRect QwtPlotItem::transform (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QwtDoubleRect &rect) const Transform a rectangle Parameters: xMap X map yMap Y map rect Rectangle in scale coordinates Returns: Rectangle in paint coordinates See also: invTransform() void QwtPlotItem::updateLegend (QwtLegend *legend) const [virtual] Update the widget that represents the item on the legend. updateLegend() is called from itemChanged() to adopt the widget representing the item on the legend to its new configuration. The default implementation is made for QwtPlotCurve and updates a QwtLegendItem(), but an item could be represented by any type of widget, by overloading legendItem() and updateLegend(). Parameters: legend Legend See also: legendItem(), itemChanged(), QwtLegend() Implements QwtLegendItemManager. Reimplemented in QwtPlotCurve. void QwtPlotItem::updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &) [virtual] Update the item to changes of the axes scale division. Update the item, when the axes of plot have changed. The default implementation does nothing, but items that depend on the scale division (like QwtPlotGrid()) have to reimplement updateScaleDiv() Parameters: xScaleDiv Scale division of the x-axis yScaleDiv Scale division of the y-axis See also: QwtPlot::updateAxes() Reimplemented in QwtPlotGrid, and QwtPlotScaleItem. int QwtPlotItem::xAxis () const Return xAxis. int QwtPlotItem::yAxis () const Return yAxis. double QwtPlotItem::z () const Plot items are painted in increasing z-order. Returns: setZ(), QwtPlotDict::itemList() Author Generated automatically by Doxygen for Qwt User's Guide from the source code. Version 5.2.2 Mon Aug 1 2011 QwtPlotItem(3)