scroll_graph.h

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/*  Ekos guide tool
    Copyright (C) 2012 Andrew Stepanenko

    Modified by Jasem Mutlaq <mutlaqja@ikarustech.com> for KStars.

    This application 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 CSCROLL_GRAPH_H_
#define CSCROLL_GRAPH_H_

#include <QtGui>
#include <QWidget>
#include <QImage>
#include <QPainter>


#define RA_LINE    0
#define DEC_LINE   1

typedef struct
{
    double *line[2];
}delta_data_t;



class cscroll_graph
{
public:
    cscroll_graph( QWidget *own, int client_width, int client_height );
    virtual ~cscroll_graph();
    
    QImage *get_buffer( void );
    bool add_point( double ra, double dec );
    void set_visible_ranges( int rx, int ry );
    void get_visible_ranges( int *rx, int *ry );
    int  get_grid_N( void );
    void reset_view( void );
    void reset_data( void );
    void on_paint( void );
    void get_screen_size( int *sx, int *sy );
    
    
private:
    // view
    QWidget *owner;
    QImage *buffer;
    QPainter canvas;
    QColor BKGD_COLOR, RA_COLOR, DEC_COLOR, GRID_COLOR, WHITE_COLOR, GRID_FONT_COLOR;
    QPen pen;   
    QBrush brush;
    int half_buffer_size_wd;
    int half_buffer_size_ht;
    int client_rect_wd;
    int client_rect_ht;
    bool need_refresh;
    
    // data
    delta_data_t data;
    int data_cnt;
    int data_idx;
    int grid_N;
    
    // grid vars...
    double grid_step_x, grid_step_y, grid_view_step_x, grid_view_step_y;
    int font_ht_k;
    
    // control
    int vis_range_x, vis_range_y;
    int half_vis_range_x, half_vis_range_y;
    
    void refresh( void );
    void draw_grid( double kx, double ky );
    void init_render_vars( void );
    
};

#endif /*CSCROLL_GRAPH_H_*/