skylabeler.h

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/***************************************************************************
                         skylabeler.h  -  K Desktop Planetarium
                             -------------------
    begin               : 2007-07-10
    copyright           : (C) 2007 by James B. Bowlin
    email               : bowlin@mindspring.com
 ***************************************************************************/

/***************************************************************************
 *                                                                       *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or   *
 *   (at your option) any later version.                                   *
 *                                                                       *
 ***************************************************************************/

#ifndef SKYLABELER_H
#define SKYLABELER_H

#include <QFontMetricsF>
#include <QList>
#include <QVector>
#include <QPainter>
#include <QPicture>
#include <QFont>

#include "skylabel.h"

class QString;
class QPointF;
class SkyMap;
class Projector;
struct LabelRun;

typedef QList<LabelRun*>    LabelRow;
typedef QVector<LabelRow*>  ScreenRows;


class SkyLabeler
{
protected:
    SkyLabeler();
    SkyLabeler( SkyLabeler& skyLabler );

public:
    enum label_t {
        STAR_LABEL,
        ASTEROID_LABEL,
        COMET_LABEL,
        PLANET_LABEL,
        JUPITER_MOON_LABEL,
        SATURN_MOON_LABEL,
        DEEP_SKY_LABEL,
        CONSTEL_NAME_LABEL,
        SATELLITE_LABEL,
        RUDE_LABEL, 
        NUM_LABEL_TYPES
    } ;


    //----- Static Methods ----------------------------------------------//

    static SkyLabeler* Instance();

    static double ZoomOffset();

    inline static void AddLabel(SkyObject *obj, label_t type)
    {
        pinstance->addLabel( obj, type );
    }


    //--------------------------------------------------------------------//
    ~SkyLabeler();

    void reset( SkyMap* skyMap );

    void draw(QPainter& p);

    //----- Font Setting -----//

    void setZoomFont();

    void setPen(const QPen& pen);

    void setFont( const QFont& font );

    void shrinkFont( int delta );

    void useStdFont();

    void resetFont();

    QFontMetricsF& fontMetrics() { return m_fontMetrics; }


    //----- Drawing/Adding Labels -----//

    void getMargins( const QString& text, float *left,
                     float *right, float *top, float *bot );

    bool drawGuideLabel( QPointF& o, const QString& text, double angle );

    bool drawNameLabel( SkyObject* obj, const QPointF& _p );

    void drawRudeNameLabel( SkyObject* obj, const QPointF& _p );

    void addLabel( SkyObject *obj, label_t type );

    void drawQueuedLabels();

    void drawQueuedLabelsType( SkyLabeler::label_t type );


    //----- Marking Regions -----//

    bool markText( const QPointF& p, const QString& text);

    bool markRegion( qreal left, qreal right, qreal top, qreal bot );

    //----- Diagnostics and Information -----//

    float fillRatio();

    float hitRatio();

    void printInfo();

    int hits()  { return m_hits; };
    int marks() { return m_marks; }

private:
    ScreenRows screenRows;

    int m_maxX;
    int m_maxY;
    int m_size;
    int m_minDeltaX;

    int m_marks;
    int m_hits;
    int m_misses;
    int m_elements;
    int m_errors;

    qreal  m_yScale;
    double m_offset;

    QFont        m_stdFont, m_skyFont;
    QFontMetricsF m_fontMetrics;

    QPainter m_p;
    QPicture m_picture;

    QVector<LabelList>   labelList;

    const Projector* m_proj;

    static SkyLabeler* pinstance;
};

#endif