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2021-03-09 Fred Gleason <fredg@paravelsystems.com>

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* Stubbed out a 'RDWaveScene' class.

Signed-off-by: Fred Gleason <fredg@paravelsystems.com>
This commit is contained in:
Fred Gleason
2021-03-09 17:25:58 -05:00
parent 3cd1001d51
commit 31af64e9aa
9 changed files with 406 additions and 1 deletions
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58
lib/rdwavescene.cpp Normal file
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// rdwavescene.cpp
//
// GraphicsScene Class for Drawing Audio Waveforms
//
// (C) Copyright 2021 Fred Gleason <fredg@paravelsystems.com>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2 as
// published by the Free Software Foundation.
//
// 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; if not, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
//
#include "rdwavescene.h"
RDWaveScene::RDWaveScene(RDCut *cut,RDWaveScene::Channel chan,
const QList<uint16_t> &energy,int x_shrink,
QObject *parent)
: QGraphicsScene(0,0,energy.size()/x_shrink,256,parent)
{
d_cut=cut;
d_channel=chan;
d_energy_data=energy;
d_x_shrink_factor=x_shrink;
//
// Waveform
//
for(int i=0;i<energy.size();i+=x_shrink) {
uint16_t lvl=energy.at(i);
for(int j=1;j<x_shrink;j++) {
if(((i+j)<energy.size())&&(energy.at(i+j))>lvl) {
lvl=energy.at(i+j);
}
}
// Bottom half
addRect((qreal)(i/x_shrink),(qreal)128,
(qreal)1,(qreal)(lvl),
QPen(Qt::black),QBrush(Qt::black));
// Top half
addRect((qreal)(i/x_shrink),(qreal)128,
(qreal)1,-((qreal)(lvl)),
QPen(Qt::black),QBrush(Qt::black));
}
}
RDWaveScene::~RDWaveScene()
{
}