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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <qwidget.h>
#include <qstring.h>
#include <qpainter.h>
#include <qpixmap.h>
#include <qbrush.h>
#include <qsizepolicy.h>
#include <qsize.h>
#include <qtimer.h>
#include <math.h>
#include "filter.h"
Filter::Filter(float *p_cutoffRef, float *p_resonanceRef, float *p_risingRef, float *p_fallingRef,
float *p_hwidthRef, float *p_smoothnessRef,
QWidget* parent, const char *name, SynthData *p_synthdata)
: QWidget (parent, name)
{
synthdata = p_synthdata;
qtimer = new QTimer(this);
connect(qtimer, SIGNAL(timeout()), this, SLOT(repaintFilter()));
cutoffRef = p_cutoffRef;
resonanceRef = p_resonanceRef;
risingRef = p_risingRef;
fallingRef = p_fallingRef;
hwidthRef = p_hwidthRef;
smoothnessRef = p_smoothnessRef;
setPalette(QPalette(QColor(0, 20, 100), QColor(0, 20, 100)));
setMinimumHeight(140);
}
Filter::~Filter()
{
}
float Filter::logfilt(float logf, float cutoff, float resonance, float rising,
float falling, float hwidth, float smoothness) {
float response;
float sr, sf, hw, sn, rn;
float log2, c1, c2, c3, c4, r1, r2, r3, r4;
float logf1, logf2, logf3, logf4, logf5, logf6, logf7;
log2 = log(2.0);
sr = rising / 48.0;
sf = falling / 48.0;
sn = smoothness;
rn = resonance;
hw = hwidth;
c1 = sr / (2.0 * sn);
c2 = - sr / (2.0 * hw);
c3 = - sf / (2.0 * hw);
c4 = sf / (2.0 * sn);
r1 = 1.0 - rn + c1 * sn * sn;
if (r1 > 1.0 - rn / 2.0) {
r1 = 1.0 - rn / 2.0;
c1 = (r1 + rn - 1.0) / (sn * sn);
}
r2 = 1.0 + c2 * hw * hw;
if (r2 < 1.0 - rn / 2.0) {
r2 = 1.0 - rn / 2.0;
c2 = (r2 - 1.0) / (hw * hw);
}
r3 = 1.0 + c3 * hw * hw;
if (r3 < 0.5) {
r3 = 0.5;
c3 = (r3 - 1.0) / (hw * hw);
}
r4 = c4 * sn * sn;
if (r4 > 0.5) {
r4 = 0.5;
c4 = r4 / (sn * sn);
}
logf4 = log(cutoff) / log2;
logf3 = logf4 - hw;
logf5 = logf4 + hw;
logf2 = logf3 + (r1 - r2) / sr;
logf1 = logf2 - sn;
logf6 = logf5 + (r3 - r4) / sf;
logf7 = logf6 + sn;
if (logf < logf1) {
response = 1.0 - rn;
}
if ((logf >= logf1) && (logf < logf2)) {
response = 1.0 - rn + c1 * (logf - logf1) * (logf - logf1);
}
if ((logf >= logf2) && (logf < logf3)) {
response = r1 + sr * (logf - logf2);
}
if ((logf >= logf3) && (logf < logf4)) {
response = 1.0 + c2 * (logf - logf4) * (logf - logf4);
}
if ((logf >= logf4) && (logf < logf5)) {
response = 1.0 + c3 * (logf - logf4) * (logf - logf4);
}
if ((logf >= logf5) && (logf < logf6)) {
response = r3 - sf * (logf - logf5);
}
if ((logf >= logf6) && (logf < logf7)) {
response = c4 * (logf - logf7) * (logf - logf7);
}
if (logf >= logf7) {
response = 0;
}
return(response);
}
float Filter::filt(float f, float cutoff, float resonance, float rising,
float falling, float hwidth, float smoothness) {
float response;
response = logfilt(log(f)/log(2.0), cutoff, resonance, rising, falling, hwidth, smoothness);
return((exp(log(10.0)/10.0 * response)-1.0) / (exp(log(10.0)/10.0)-1.0));
// return((exp(response)-1.0) / (exp(1.0)-1.0));
}
void Filter::paintEvent(QPaintEvent *) {
QPixmap pm(width(), height());
QPainter p(&pm);
int l1;
float x1, y1, x2, y2, xscale, yscale;
pm.fill(QColor(0, 20, 100));
p.setViewport(0, 0, width(), height());
p.setWindow(0, 0, width(), height());
p.setPen(QColor(220, 100, 0));
p.drawRect(0, 0, width(), height());
xscale = (float)width() * log(2.0) / log((float)synthdata->rate / 2.0);
yscale = (float)(height()-1);
for (l1 = 0; l1 < width()-1; l1++) {
x1 = (float)l1 / xscale;
x2 = (float)(l1 + 1) / xscale;
y1 = yscale * (1.0 - logfilt(x1, *cutoffRef, *resonanceRef, *risingRef, *fallingRef, *hwidthRef, *smoothnessRef));
y2 = yscale * (1.0 - logfilt(x2, *cutoffRef, *resonanceRef, *risingRef, *fallingRef, *hwidthRef, *smoothnessRef));
p.drawLine(l1, y1, l1 + 1, y2);
}
xscale = (float)width() / (float)(synthdata->rate / 2.0);
p.setPen(QColor(0, 200, 100));
for (l1 = 0; l1 < width()-1; l1++) {
x1 = (float)l1 / xscale;
x2 = (float)(l1 + 1) / xscale;
y1 = yscale * (1.0 - filt(x1, *cutoffRef, *resonanceRef, *risingRef, *fallingRef, *hwidthRef, *smoothnessRef));
y2 = yscale * (1.0 - filt(x2, *cutoffRef, *resonanceRef, *risingRef, *fallingRef, *hwidthRef, *smoothnessRef));
p.drawLine(l1, y1, l1 + 1, y2);
}
bitBlt(this, 0, 0, &pm);
}
void Filter::repaintFilter() {
repaint(false);
}
void Filter::updateFilter(int value) {
qtimer->start(10, true);
}
QSize Filter::sizeHint() const {
return QSize(FILTER_MINIMUM_WIDTH, FILTER_MINIMUM_HEIGHT);
}
QSizePolicy Filter::sizePolicy() const {
return QSizePolicy( QSizePolicy::MinimumExpanding, QSizePolicy::MinimumExpanding);
}
void Filter::resizeEvent (QResizeEvent* )
{
repaint(true);
}
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