151 lines
4.3 KiB
C
151 lines
4.3 KiB
C
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/*******************************************************************************/
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/* Copyright (C) 2008 Jonathan Moore Liles */
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/* */
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/* This program is free software; you can redistribute it and/or modify it */
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/* under the terms of the GNU General Public License as published by the */
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/* Free Software Foundation; either version 2 of the License, or (at your */
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/* option) any later version. */
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/* */
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/* This program is distributed in the hope that it will be useful, but WITHOUT */
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/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or */
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/* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for */
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/* more details. */
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/* */
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/* You should have received a copy of the GNU General Public License along */
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/* with This program; see the file COPYING. If not,write to the Free Software */
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/* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/*******************************************************************************/
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/* routines to draw a waveform from peak data */
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#include <FL/Fl.H>
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#include <FL/fl_draw.H>
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#include "Waveform.H"
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#include <math.h>
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#include <algorithm>
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using std::min;
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using std::max;
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bool Waveform::fill = true;
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bool Waveform::outline = true;
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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,
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* outlined, filled, polygonal, rectified. */
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void
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Waveform::scale ( Peak *pbuf, int npeaks, float gain )
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{
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/* scale it */
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for ( int j = npeaks; j--; )
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{
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pbuf[ j ].min *= gain;
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pbuf[ j ].max *= gain;
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}
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}
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/** draw a portion of /clip/'s waveform. coordinates are the portion to draw */
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void
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Waveform::draw ( int X, int Y, int W, int H,
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const Peak *pbuf, int peaks, int skip,
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Fl_Color color )
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{
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int j;
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int start = 0;
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const int halfheight = H / 2;
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const int mid = Y + halfheight;
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const int ty = Y + halfheight;
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W = min( peaks, W );
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if ( Waveform::fill )
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{
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if ( Waveform::vary_color )
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{
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j = start;
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for ( int x = X; x < X + W; ++x, j += skip )
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{
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const Peak p = pbuf[ j ];
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const float diff = fabs( p.max - p.min );
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if ( diff > 2.0f )
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fl_color( FL_RED );
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else
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if ( Waveform::vary_color )
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fl_color( fl_color_average( FL_WHITE, color, diff * 0.5f ) );
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else
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fl_color( color );
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const int ty = mid - ( halfheight * p.min );
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const int by = mid - ( halfheight * p.max );
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fl_line( x, ty, x, by );
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}
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}
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else
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{
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// fl_color( fl_color_add_alpha( color, 127 ) );
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fl_color( color );
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fl_begin_complex_polygon();
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j = start;
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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();
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// fl_begin_line();
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j = start + ( W * skip );
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for ( int x = X + W; x >= X; x--, j -= skip )
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fl_vertex( x, ty - ( halfheight * pbuf[ j ].max ) );
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fl_end_complex_polygon();
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// fl_line_style( FL_SOLID, 0 );
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}
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}
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if ( Waveform::outline )
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{
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fl_color( fl_darker( fl_darker( color ) ) );
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fl_line_style( FL_SOLID, 0 );
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fl_begin_line();
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unsigned long end = start + W;
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j = start;
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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();
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fl_begin_line();
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j = start;
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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 );
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}
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}
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