non/timeline/src/Waveform.C

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/*******************************************************************************/
/* 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. */
/*******************************************************************************/
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/* routines to draw a waveform from peak data */
#include <FL/Fl.H>
#include <FL/fl_draw.H>
#include "Waveform.H"
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#include <math.h>
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#include <algorithm>
using std::min;
using std::max;
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bool Waveform::fill = true;
bool Waveform::outline = true;
bool Waveform::vary_color = true;
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bool Waveform::logarithmic = true;
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/* TODO: split the variations into separate functions. eg, plain,
* outlined, filled, polygonal, rectified. */
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void
Waveform::scale ( Peak *pbuf, int npeaks, float gain )
{
/* scale it */
for ( int j = npeaks; j--; )
{
pbuf[ j ].min *= gain;
pbuf[ j ].max *= gain;
}
}
/** draw a portion of /clip/'s waveform. coordinates are the portion to draw */
void
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Waveform::draw ( int X, int Y, int W, int H,
const Peak *pbuf, int peaks, int skip,
Fl_Color color )
{
int j;
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int start = 0;
const int halfheight = H / 2;
const int mid = Y + halfheight;
const int ty = Y + halfheight;
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W = min( peaks, W );
if ( ! W )
return;
if ( Waveform::fill )
{
if ( Waveform::vary_color )
{
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 ( diff > 2.0f )
fl_color( FL_RED );
else
if ( Waveform::vary_color )
fl_color( fl_color_average( FL_WHITE, color, diff * 0.5f ) );
else
fl_color( color );
const int ty = mid - ( halfheight * p.min );
const int by = mid - ( halfheight * p.max );
fl_line( x, ty, x, by );
}
}
else
{
fl_color( color );
fl_begin_complex_polygon();
j = start;
for ( int x = X; x <= X + W; x++, j += skip )
fl_vertex( x, ty - ( halfheight * pbuf[ j ].min ) );
j -= skip;
for ( int x = X + W; x >= X; x--, j -= skip )
fl_vertex( x, ty - ( halfheight * pbuf[ j ].max ) );
fl_end_complex_polygon();
}
}
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if ( Waveform::outline )
{
fl_color( fl_darker( fl_darker( color ) ) );
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fl_line_style( FL_SOLID, 0 );
fl_begin_line();
j = start;
for ( int x = X; x < X + W; x++, j += skip )
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fl_vertex( x, ty - ( halfheight * pbuf[ j ].min ) );
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fl_end_line();
fl_begin_line();
j = start;
for ( int x = X; x < X + W; x++, j += skip )
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fl_vertex( x, ty - ( halfheight * pbuf[ j ].max ) );
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fl_end_line();
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fl_line_style( FL_SOLID, 0 );
}
}