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waveformPlot.cpp
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waveformPlot.cpp
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/* miniSynth - A Simple Software Synthesizer
Copyright (C) 2015 Ville Räisänen <vsr at vsr.name>
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 3 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. If not, see <http://www.gnu.org/licenses/>.
*/
#include "waveformPlot.h"
#include "waveform.h"
WaveformPlot::WaveformPlot(QWidget *parent) : QWidget(parent) {
waveForm = 0;
border = 5;
setMode(Waveform::MODE_SIN);
}
WaveformPlot::~WaveformPlot() {
delete waveForm;
waveForm = 0;
}
void
WaveformPlot::setMode(int _mode) {
mode = _mode;
delete waveForm;
waveForm = new LinearSynthesis(mode);
refreshPixmap();
}
void
WaveformPlot::setTimbre(QVector<int> &litudes, QVector<int> &phases) {
waveForm->setTimbre(amplitudes, phases);
refreshPixmap();
}
void
WaveformPlot::refreshPixmap() {
pixmap = QPixmap(size());
pixmap.fill(palette().color(QPalette::Window));
QPainter painter(&pixmap);
QPen penWave, penGrid, penBorder;
penWave.setStyle(Qt::SolidLine);
penWave.setWidth(2);
penWave.setColor(QColor(0, 0, 0));
penGrid.setStyle(Qt::DashLine);
penGrid.setWidth(1);
penGrid.setColor(QColor(150, 150, 150));
penBorder.setStyle(Qt::SolidLine);
penBorder.setWidth(1);
penBorder.setColor(QColor(0, 0, 0));
unsigned int ww, wh;
ww = width() - 2*border;
wh = height() - 2*border;
painter.setPen(penGrid);
painter.drawLine(0, border + wh/2, width(), border + wh/2);
painter.setPen(penBorder);
painter.drawLine(border, border, width()-border, border);
painter.drawLine(border, height() - border, width()-border, height() - border);
painter.drawLine(border, border, border, height() - border);
painter.drawLine(width() - border, border, width() - border, height() - border);
painter.setPen(penWave);
qreal dt = 1 / ((qreal)ww);
Q_ASSERT(ww > 0);
qreal *vals = new qreal[ww];
qreal valmax = 0;
for (unsigned int x= 0; x < ww; x++) {
qreal t = dt*((qreal)x),
val = waveForm->evalTimbre(2*M_PI * t);
vals[x] = val;
if (qAbs(val) > valmax) valmax = qAbs(val);
}
for (unsigned int x= 0; x < ww-1; x++) {
qreal val = vals[x]/valmax,
val_next = vals[x+1]/valmax;
unsigned int y = (unsigned int)((val + 1) * (qreal)wh/(2)),
y_next = (unsigned int)((val_next + 1) * (qreal)wh/(2));
painter.drawLine(x+border, y+border, x+1+border, y_next+border);
}
delete [] vals;
update();
}
void
WaveformPlot::paintEvent(QPaintEvent *event) {
QStylePainter painter(this);
painter.drawPixmap(0, 0, pixmap);
Q_UNUSED(event);
}
void
WaveformPlot::resizeEvent(QResizeEvent *event) {
refreshPixmap();
Q_UNUSED(event);
}