qwt_plot_curve.h

/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
 * Qwt Widget Library
 * Copyright (C) 1997   Josef Wilgen
 * Copyright (C) 2002   Uwe Rathmann
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the Qwt License, Version 1.0
 *****************************************************************************/

#ifndef QWT_PLOT_CURVE_H
#define QWT_PLOT_CURVE_H

#include <qpen.h>
#include <qstring.h>
#include "qwt_global.h"
#include "qwt_plot_item.h"
#include "qwt_text.h"
#include "qwt_polygon.h"
#include "qwt_data.h"

class QPainter;
class QwtScaleMap;
class QwtSymbol;
class QwtCurveFitter;

class QWT_EXPORT QwtPlotCurve: public QwtPlotItem
{
public:
    enum CurveType
    {
        Yfx,
        Xfy
    };

    enum CurveStyle
    {
        NoCurve,

        Lines,
        Sticks,
        Steps,
        Dots,

        UserCurve = 100
    };

    enum CurveAttribute
    {
        Inverted = 1,
        Fitted = 2
    };

    enum PaintAttribute
    {
        PaintFiltered = 1,
        ClipPolygons = 2
    };

    explicit QwtPlotCurve();
    explicit QwtPlotCurve(const QwtText &title);
    explicit QwtPlotCurve(const QString &title);

    virtual ~QwtPlotCurve();

    virtual int rtti() const;

    void setCurveType(CurveType);
    CurveType curveType() const;

    void setPaintAttribute(PaintAttribute, bool on = true);
    bool testPaintAttribute(PaintAttribute) const;

    void setRawData(const double *x, const double *y, int size);
    void setData(const double *xData, const double *yData, int size);
    void setData(const QwtArray<double> &xData, const QwtArray<double> &yData);
#if QT_VERSION < 0x040000
    void setData(const QwtArray<QwtDoublePoint> &data);
#else
    void setData(const QPolygonF &data);
#endif
    void setData(const QwtData &data);
    
    int closestPoint(const QPoint &pos, double *dist = NULL) const;

    QwtData &data();
    const QwtData &data() const;

    int dataSize() const;
    inline double x(int i) const;
    inline double y(int i) const;

    virtual QwtDoubleRect boundingRect() const;

    inline double minXValue() const { return boundingRect().left(); }
    inline double maxXValue() const { return boundingRect().right(); }
    inline double minYValue() const { return boundingRect().top(); }
    inline double maxYValue() const { return boundingRect().bottom(); }

    void setCurveAttribute(CurveAttribute, bool on = true);
    bool testCurveAttribute(CurveAttribute) const;

    void setPen(const QPen &);
    const QPen &pen() const;

    void setBrush(const QBrush &);
    const QBrush &brush() const;

    void setBaseline(double ref);
    double baseline() const;

    void setStyle(CurveStyle style);
    CurveStyle style() const;

    void setSymbol(const QwtSymbol &s);
    const QwtSymbol& symbol() const;

    void setCurveFitter(QwtCurveFitter *);
    QwtCurveFitter *curveFitter() const;

    virtual void draw(QPainter *p, 
        const QwtScaleMap &xMap, const QwtScaleMap &yMap,
        const QRect &) const;

    virtual void draw(QPainter *p, 
        const QwtScaleMap &xMap, const QwtScaleMap &yMap,
        int from, int to) const;

    void draw(int from, int to) const;

    virtual void updateLegend(QwtLegend *) const;

protected:

    void init();

    virtual void drawCurve(QPainter *p, int style,
        const QwtScaleMap &xMap, const QwtScaleMap &yMap,
        int from, int to) const;

    virtual void drawSymbols(QPainter *p, const QwtSymbol &,
        const QwtScaleMap &xMap, const QwtScaleMap &yMap,
        int from, int to) const;

    void drawLines(QPainter *p,
        const QwtScaleMap &xMap, const QwtScaleMap &yMap,
        int from, int to) const;
    void drawSticks(QPainter *p,
        const QwtScaleMap &xMap, const QwtScaleMap &yMap,
        int from, int to) const;
    void drawDots(QPainter *p,
        const QwtScaleMap &xMap, const QwtScaleMap &yMap,
        int from, int to) const;
    void drawSteps(QPainter *p,
        const QwtScaleMap &xMap, const QwtScaleMap &yMap,
        int from, int to) const;

    void fillCurve(QPainter *,
        const QwtScaleMap &, const QwtScaleMap &,
        QwtPolygon &) const;
    void closePolyline(const QwtScaleMap &, const QwtScaleMap &,
        QwtPolygon &) const;

private:
    QwtData *d_xy;

    class PrivateData;
    PrivateData *d_data;
};

inline QwtData &QwtPlotCurve::data()
{
    return *d_xy;
}

inline const QwtData &QwtPlotCurve::data() const
{
    return *d_xy;
}

inline double QwtPlotCurve::x(int i) const 
{ 
    return d_xy->x(i); 
}

inline double QwtPlotCurve::y(int i) const 
{ 
    return d_xy->y(i); 
}

#endif

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