SysTutorials Posts

QwtScaleArithmetic – Arithmetic including a tolerance. Synopsis #include <qwt_scale_engine.h> Static Public Member Functions static double ceilEps (double value, double intervalSize) static double floorEps (double value, double intervalSize) static double divideEps (double interval, double steps) Divide an interval into steps. static double divideInterval (double interval, int numSteps, uint base) Detailed Description Arithmetic including a tolerance. Member…

QwtSamplingThread – A thread collecting samples at regular intervals. Synopsis #include <qwt_sampling_thread.h> Inherits QThread. Public Slots void setInterval (double interval) void stop () Public Member Functions virtual ~QwtSamplingThread () Destructor. double interval () const double elapsed () const Protected Member Functions QwtSamplingThread (QObject *parent=NULL) Constructor. virtual void run () virtual void sample (double elapsed)=0 Detailed…

QwtRoundScaleDraw – A class for drawing round scales. Synopsis #include <qwt_round_scale_draw.h> Inherits QwtAbstractScaleDraw. Inherited by QwtAnalogClockScaleDraw, and QwtCompassScaleDraw. Public Member Functions QwtRoundScaleDraw () Constructor. virtual ~QwtRoundScaleDraw () Destructor. void setRadius (double radius) double radius () const void moveCenter (double x, double y) Move the center of the scale draw, leaving the radius unchanged. void moveCenter…

QwtRichTextEngine – A text engine for Qt rich texts. Synopsis #include <qwt_text_engine.h> Inherits QwtTextEngine. Public Member Functions QwtRichTextEngine () Constructor. virtual double heightForWidth (const QFont &font, int flags, const QString &text, double width) const virtual QSizeF textSize (const QFont &font, int flags, const QString &text) const virtual void draw (QPainter *painter, const QRectF &rect, int…

QwtRasterData – QwtRasterData defines an interface to any type of raster data. Synopsis #include <qwt_raster_data.h> Inherited by QwtMatrixRasterData. Public Types enum ConrecFlag { IgnoreAllVerticesOnLevel = 0x01, IgnoreOutOfRange = 0x02 } Flags to modify the contour algorithm. typedef QMap< double, QPolygonF > ContourLines Contour lines. typedef QFlags< ConrecFlag > ConrecFlags Flags to modify the contour algorithm….

QwtPowerTransform – A transformation using pow() Synopsis #include <qwt_transform.h> Inherits QwtTransform. Public Member Functions QwtPowerTransform (double exponent) virtual ~QwtPowerTransform () Destructor. virtual double transform (double value) const virtual double invTransform (double value) const virtual QwtTransform * copy () const Detailed Description A transformation using pow() QwtPowerTransform preserves the sign of a value. F.e. a transformation…

QwtPolygonFData – Data class containing a single QwtArray<QwtDoublePoint> object. Synopsis #include <qwt_data.h> Inherits QwtData. Public Member Functions QwtPolygonFData (const QPolygonF &) QwtPolygonFData & operator= (const QwtPolygonFData &) virtual QwtData * copy () const virtual size_t size () const virtual double x (size_t i) const virtual double y (size_t i) const const QPolygonF & data ()…

QwtPointSeriesData – Interface for iterating over an array of points. Synopsis #include <qwt_series_data.h> Inherits QwtArraySeriesData< QPointF >. Public Member Functions QwtPointSeriesData (const QVector< QPointF > &=QVector< QPointF >()) virtual QRectF boundingRect () const Calculate the bounding rectangle. Additional Inherited Members Detailed Description Interface for iterating over an array of points. Constructor & Destructor Documentation QwtPointSeriesData::QwtPointSeriesData…

QwtPointPolar – A point in polar coordinates. Synopsis #include <qwt_point_polar.h> Public Member Functions QwtPointPolar () QwtPointPolar (double azimuth, double radius) QwtPointPolar (const QwtPointPolar &) QwtPointPolar (const QPointF &) void setPoint (const QPointF &) QPointF toPoint () const bool isValid () const Returns true if radius() >= 0.0. bool isNull () const Returns true if radius()…

QwtPointMapper – A helper class for translating a series of points. Synopsis #include <qwt_point_mapper.h> Public Types enum TransformationFlag { RoundPoints = 0x01, WeedOutPoints = 0x02 } Flags affecting the transformation process. typedef QFlags < TransformationFlag > TransformationFlags" Flags affecting the transformation process. Public Member Functions QwtPointMapper () Constructor. ~QwtPointMapper () Destructor. void setFlags (TransformationFlags) TransformationFlags…

QwtPointArrayData – Interface for iterating over two QVector<double> objects. Synopsis #include <qwt_point_data.h> Inherits QwtSeriesData< QPointF >. Public Member Functions QwtPointArrayData (const QVector< double > &x, const QVector< double > &y) QwtPointArrayData (const double *x, const double *y, size_t size) virtual QRectF boundingRect () const Calculate the bounding rectangle. virtual size_t size () const virtual QPointF…

QwtPoint3DSeriesData – Interface for iterating over an array of 3D points. Synopsis #include <qwt_series_data.h> Inherits QwtArraySeriesData< QwtPoint3D >. Public Member Functions QwtPoint3DSeriesData (const QVector< QwtPoint3D > &=QVector< QwtPoint3D >()) virtual QRectF boundingRect () const Calculate the bounding rectangle. Additional Inherited Members Detailed Description Interface for iterating over an array of 3D points. Constructor & Destructor…

QwtPoint3D – QwtPoint3D class defines a 3D point in double coordinates. Synopsis #include <qwt_point_3d.h> Public Member Functions QwtPoint3D () QwtPoint3D (double x, double y, double z) Constructs a point with coordinates specified by x, y and z. QwtPoint3D (const QwtPoint3D &) QwtPoint3D (const QPointF &) bool isNull () const double x () const double y…

QwtPlotZoomer – QwtPlotZoomer provides stacked zooming for a plot widget. Synopsis #include <qwt_plot_zoomer.h> Inherits QwtPlotPicker. Public Slots void moveBy (double x, double y) virtual void moveTo (const QPointF &) virtual void zoom (const QRectF &) Zoom in. virtual void zoom (int up) Zoom in or out. Signals void zoomed (const QRectF &rect) Public Member Functions…

QwtPlotZoneItem – A plot item, which displays a zone. Synopsis #include <qwt_plot_zoneitem.h> Inherits QwtPlotItem. Public Member Functions QwtPlotZoneItem () Constructor. virtual ~QwtPlotZoneItem () Destructor. virtual int rtti () const void setOrientation (Qt::Orientation) Set the orientation of the zone. Qt::Orientation orientation () void setInterval (double min, double max) void setInterval (const QwtInterval &) QwtInterval interval ()…

QwtPlotTradingCurve – QwtPlotTradingCurve illustrates movements in the price of a financial instrument over time. Synopsis #include <qwt_plot_tradingcurve.h> Inherits QwtPlotSeriesItem, and QwtSeriesStore< QwtOHLCSample >. Public Types enum SymbolStyle { NoSymbol = -1, Bar, CandleStick, UserSymbol = 100 } Symbol styles. enum Direction { Increasing, Decreasing } Direction of a price movement. enum PaintAttribute { ClipSymbols =…

QwtPlotTextLabel – A plot item, which displays a text label. Synopsis #include <qwt_plot_textlabel.h> Inherits QwtPlotItem. Public Member Functions QwtPlotTextLabel () Constructor. virtual ~QwtPlotTextLabel () Destructor. virtual int rtti () const void setText (const QwtText &) QwtText text () const void setMargin (int margin) int margin () const virtual QRectF textRect (const QRectF &, const QSizeF…

QwtPlotSvgItem – A plot item, which displays data in Scalable Vector Graphics (SVG) format. Synopsis #include <qwt_plot_svgitem.h> Inherits QwtPlotItem. Public Member Functions QwtPlotSvgItem (const QString &title=QString::null) Constructor. QwtPlotSvgItem (const QwtText &title) Constructor. virtual ~QwtPlotSvgItem () Destructor. bool loadFile (const QRectF &, const QString &fileName) bool loadData (const QRectF &, const QByteArray &) virtual QRectF boundingRect…

QwtPlotSpectrogram – A plot item, which displays a spectrogram. Synopsis #include <qwt_plot_spectrogram.h> Inherits QwtPlotRasterItem. Public Types enum DisplayMode { ImageMode = 0x01, ContourMode = 0x02 } typedef QFlags< DisplayMode > DisplayModes Display modes. Public Member Functions QwtPlotSpectrogram (const QString &title=QString::null) virtual ~QwtPlotSpectrogram () Destructor. void setDisplayMode (DisplayMode, bool on=true) bool testDisplayMode (DisplayMode) const void setData…

QwtPlotSpectroCurve – Curve that displays 3D points as dots, where the z coordinate is mapped to a color. Synopsis #include <qwt_plot_spectrocurve.h> Inherits QwtPlotSeriesItem, and QwtSeriesStore< QwtPoint3D >. Public Types enum PaintAttribute { ClipPoints = 1 } Paint attributes. typedef QFlags< PaintAttribute > PaintAttributes Paint attributes. Public Member Functions QwtPlotSpectroCurve (const QString &title=QString::null) QwtPlotSpectroCurve (const QwtText…