1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
/***************************************************************************
LowPassDialog.cpp - dialog for the "lowpass" plugin
-------------------
begin : Fri Mar 07 2003
copyright : (C) 2003 by Thomas Eschenbacher
email : Thomas.Eschenbacher@gmx.de
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
#include "config.h"
#include <math.h>
#include <new>
#include <QObject>
#include <QPainter>
#include <QPushButton>
#include <QRadioButton>
#include <QSlider>
#include <QSpinBox>
#include <QWidget>
#include <KHelpClient>
#include <KLocalizedString>
#include "libkwave/String.h"
#include "libkwave/Utils.h"
#include "libgui/FrequencyResponseWidget.h"
#include "libgui/ScaleWidget.h"
#include "LowPassDialog.h"
#include "LowPassFilter.h"
//***************************************************************************
Kwave::LowPassDialog::LowPassDialog(QWidget *parent, double sample_rate)
:QDialog(parent), Ui::LowPassDlg(), Kwave::PluginSetupDialog(),
m_frequency(3500),
m_sample_rate(sample_rate), m_filter(nullptr)
{
setupUi(this);
setModal(true);
// set maximum frequency to sample rate / 2
double f_max = sample_rate / 2.0;
slider->setMaximum(Kwave::toInt(f_max));
spinbox->setMaximum(Kwave::toInt(f_max));
// initialize the frequency scale widget
scale_freq->setMinMax(0, Kwave::toInt(f_max));
scale_freq->setLogMode(false);
scale_freq->setUnit(i18n("Hz"));
// initialize the attenuation scale widget
scale_db->setMinMax(-24, +6);
scale_db->setLogMode(false);
scale_db->setUnit(i18n("dB"));
// initialize the frequency response widget
freq_response->init(f_max, -24, +6);
// set up the low pass filter dunction
m_filter = new(std::nothrow) Kwave::LowPassFilter();
freq_response->setFilter(m_filter);
// initialize the controls and the curve display
slider->setValue(Kwave::toInt(m_frequency));
spinbox->setValue(Kwave::toInt(m_frequency));
updateDisplay();
// changes in the slider or spinbox
connect(spinbox, SIGNAL(valueChanged(int)),
this, SLOT(valueChanged(int)));
// click to the "Listen" button
connect(btListen, SIGNAL(toggled(bool)),
this, SLOT(listenToggled(bool)));
// expand the "Listen" button to it's maximum width
listenToggled(true);
if (btListen->width() > btListen->minimumWidth())
btListen->setMinimumWidth(btListen->width());
listenToggled(false);
if (btListen->width() > btListen->minimumWidth())
btListen->setMinimumWidth(btListen->width());
// set the initial size of the dialog
int h = (width() * 3) / 5;
if (height() < h) resize(width(), h);
int w = (height() * 5) / 3;
if (width() < w) resize(w, height());
connect(buttonBox_Help->button(QDialogButtonBox::Help), SIGNAL(clicked()),
this, SLOT(invokeHelp()));
// set the focus onto the "OK" button
buttonBox->button(QDialogButtonBox::Ok)->setFocus();
}
//***************************************************************************
Kwave::LowPassDialog::~LowPassDialog()
{
// better stop pre-listen now
listenToggled(false);
if (freq_response) freq_response->setFilter(nullptr);
delete m_filter;
m_filter = nullptr;
}
//***************************************************************************
void Kwave::LowPassDialog::valueChanged(int pos)
{
if (Kwave::toInt(m_frequency) != pos) {
m_frequency = pos;
updateDisplay();
emit changed(m_frequency);
}
}
//***************************************************************************
QStringList Kwave::LowPassDialog::params()
{
QStringList list;
list << QString::number(m_frequency);
return list;
}
//***************************************************************************
void Kwave::LowPassDialog::setParams(QStringList ¶ms)
{
// evaluate the parameter list
bool ok;
double frequency = params[0].toDouble(&ok);
Q_ASSERT(ok);
if (ok) m_frequency = frequency;
slider->setValue(Kwave::toInt(m_frequency));
spinbox->setValue(Kwave::toInt(m_frequency));
updateDisplay();
}
//***************************************************************************
void Kwave::LowPassDialog::updateDisplay()
{
double fs = m_sample_rate;
if (m_filter && (fs > 0.0))
{
m_filter->setFrequency(QVariant(2.0 * M_PI * m_frequency / fs));
if (freq_response) freq_response->repaint();
}
}
//***************************************************************************
void Kwave::LowPassDialog::listenToggled(bool listen)
{
Q_ASSERT(btListen);
if (!btListen) return;
if (listen) {
// start pre-listen mode
emit startPreListen();
btListen->setText(i18n("&Stop"));
} else {
// stop pre-listen mode
emit stopPreListen();
btListen->setText(i18n("&Listen"));
}
}
//***************************************************************************
void Kwave::LowPassDialog::listenStopped()
{
if (btListen) btListen->setChecked(false);
}
//***************************************************************************
void Kwave::LowPassDialog::invokeHelp()
{
KHelpClient::invokeHelp(_("plugin_sect_lowpass"));
}
//***************************************************************************
//***************************************************************************
#include "moc_LowPassDialog.cpp"
|
