/*******************************************************************************/
/* Copyright (C) 2008 Jonathan Moore Liles                                     */
/*                                                                             */
/* 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.                                                  */
/*                                                                             */
/* This program is distributed in the hope that it will be useful, but WITHOUT */
/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or       */
/* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for   */
/* more details.                                                               */
/*                                                                             */
/* You should have received a copy of the GNU General Public License along     */
/* with This program; see the file COPYING.  If not,write to the Free Software */
/* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
/*******************************************************************************/

#include <stdio.h>

#include <FL/Enumerations.H>
#include <FL/Fl.H>
#include <FL/fl_draw.H>

#include "Timeline.H"

#include "Waveform.H"

#include <math.h>


bool Waveform::fill = true;
bool Waveform::outline = true;
bool Waveform::vary_color = true;
bool Waveform::logarithmic = true;

/* TODO: split the variations into separate functions. eg, plain,
 * outlined, filled, polygonal, rectified. */

/* TODO: this should be made completely independent of /timeline/ so that it can be used for other purposes (file previews) */

/** draw a portion of /clip/'s waveform. coordinates are the portion to draw  */
void
Waveform::draw ( int X, int Y, int W, int H,
                 Peak *pbuf, int peaks, int skip,
                 Fl_Color color )
{
    fl_push_clip( X, Y, W, H );

    int j;

//    int start = timeline->ts_to_x( _r->start ) + (X - ox);

    int start = 0;

    const int halfheight = H / 2;
    const int mid = Y + halfheight;

    W = min( peaks, W );

    if ( Waveform::fill )
    {
        j = start;
        for ( int x = X; x < X + W; ++x, j += skip )
        {
            const Peak p = pbuf[ j ];

            const float diff = fabs( p.max - p.min );

/*             if ( Waveform::logarithmic ) */
/*             { */
/*                 p.max = 10.0f * log10f( p.max ); */
/*                 p.min = 10.0f * log10f( p.min ); */
/*             } */

            if ( diff > 2.0f )
                fl_color( FL_RED );
            else
                if ( Waveform::vary_color )
                    fl_color( fl_color_average( FL_WHITE, color, diff / 2.0f ) );
                else
                    fl_color( color );

            const int ty = mid + ( halfheight * p.min );
            const int by = mid + ( halfheight * p.max );
            fl_line( x, ty, x, by );

/*         if ( outline ) */
/*         { */
/*             fl_color( fl_darker( fl_darker( color ) ) ); */
/*             fl_line( x, ty - 2, x, ty ); */
/*             fl_line( x, by + 2, x, by ); */
/*         } */

        }
    }

    const int ty = Y + halfheight;

    if ( Waveform::outline )
    {

        fl_color( fl_darker( fl_darker( color ) ) );

        fl_line_style( FL_SOLID, 2 );

        fl_begin_line();

        j = start;
        for ( int x = X; x < X + W; ++x, j += skip )
            fl_vertex( x, ty + ( halfheight * pbuf[ j ].min ) );

        fl_end_line();

        fl_begin_line();

        j = start;
        for ( int x = X; x < X + W; ++x, j += skip )
            fl_vertex( x, ty + ( halfheight * pbuf[ j ].max ) );

        fl_end_line();

        fl_line_style( FL_SOLID, 0 );

    }

    fl_pop_clip();
}