Added controls to change various parameters

main.cpp

@@ -1,40 +1,13 @@
 #include <QApplication>
-#include <QAudioInput>
 
-#include "device.h"
-#include "osciwidget.h"
+#include "mainwindow.h"
 
 int main(int argc, char *argv[])
 {
     QApplication a(argc, argv);
 
-    const auto info = []() -> const QAudioDeviceInfo {
-        for (const auto &info : QAudioDeviceInfo::availableDevices(QAudio::AudioInput))
-            if (info.deviceName() == "alsa_output.pci-0000_00_1b.0.analog-stereo.monitor")
-                return info;
-        Q_UNREACHABLE();
-    }();
-
-    QAudioFormat format;
-    format.setSampleRate(44100);
-    format.setChannelCount(2);
-    format.setSampleSize(16);
-    format.setSampleType(QAudioFormat::SignedInt);
-    format.setCodec("audio/pcm");
-    format.setByteOrder(QAudioFormat::LittleEndian);
-
-    QAudioInput input(info, format);
-    input.setBufferSize(44100/60*4);
-
-    OsciWidget widget;
-    widget.show();
-
-    Device device;
-    input.start(&device);
-    QObject::connect(&device, &Device::samplesReceived, &widget, &OsciWidget::samplesReceived);
-
-    //FakeDevice fake;
-    //QObject::connect(&fake, &FakeDevice::samplesReceived, &widget, &OsciWidget::samplesReceived);
+    MainWindow mainWindow;
+    mainWindow.show();
 
     return a.exec();
 }

mainwindow.cpp

@@ -0,0 +1,92 @@
+#include "mainwindow.h"
+
+#include <QAudioInput>
+#include <QAudioFormat>
+#include <QAudioDeviceInfo>
+#include <QButtonGroup>
+
+MainWindow::MainWindow(QWidget *parent) :
+    QMainWindow(parent),
+    m_audioDevices(QAudioDeviceInfo::availableDevices(QAudio::AudioInput))
+{
+    m_ui.setupUi(this);
+
+    connect(&m_device, &Device::samplesReceived, m_ui.widget, &OsciWidget::renderSamples);
+
+    //connect(&m_fakeDevice, &FakeDevice::samplesReceived, m_ui.widget, &OsciWidget::samplesReceived);
+
+    for (const auto &device : m_audioDevices)
+        m_ui.comboBoxDevices->addItem(device.deviceName());
+
+    for (const auto samplerate : { 44100, 48000, 96000, 192000 })
+        m_ui.comboBoxSamplerate->addItem(tr("%0").arg(samplerate), samplerate);
+
+    connect(m_ui.pushButtonToggle, &QAbstractButton::pressed, this, &MainWindow::toggle);
+
+    for (const auto framerate : {15, 30, 50, 60})
+        m_ui.comboBoxFps->addItem(tr("%0 FPS").arg(framerate), framerate);
+
+    m_ui.comboBoxFps->setCurrentIndex(m_ui.comboBoxFps->findData(m_ui.widget->framerate()));
+
+    connect(m_ui.comboBoxFps, &QComboBox::currentIndexChanged, this, [&combobox=*m_ui.comboBoxFps,&widget=*m_ui.widget](){
+        widget.setFramerate(combobox.currentData().toInt());
+    });
+
+    m_ui.spinBoxBlend->setValue(m_ui.widget->blend());
+
+    connect(m_ui.spinBoxBlend, qOverload<int>(&QSpinBox::valueChanged), m_ui.widget, &OsciWidget::setBlend);
+
+    auto buttonGroup = new QButtonGroup;
+    buttonGroup->setExclusive(true);
+    buttonGroup->addButton(m_ui.radioButtonScale50, 0);
+    buttonGroup->addButton(m_ui.radioButtonScale100, 1);
+    buttonGroup->addButton(m_ui.radioButtonScale200, 2);
+    buttonGroup->addButton(m_ui.radioButtonScale400, 3);
+
+    connect(buttonGroup, qOverload<int>(&QButtonGroup::buttonClicked), this, [&widget=*m_ui.widget](int index){
+        float factor;
+
+        switch (index)
+        {
+        case 0: factor = .5f; break;
+        case 1: factor = 1.f; break;
+        case 2: factor = 2.f; break;
+        case 3: factor = 4.f; break;
+        default: Q_UNREACHABLE();
+        }
+
+        widget.setFactor(factor);
+    });
+
+    toggle();
+}
+
+void MainWindow::toggle()
+{
+    if (m_input)
+    {
+        m_input = nullptr;
+        m_ui.comboBoxDevices->setEnabled(true);
+        m_ui.comboBoxSamplerate->setEnabled(true);
+        m_ui.pushButtonToggle->setText("▶");
+    }
+    else
+    {
+        QAudioFormat format;
+        format.setSampleRate(m_ui.comboBoxSamplerate->currentData().toInt());
+        format.setChannelCount(2);
+        format.setSampleSize(16);
+        format.setSampleType(QAudioFormat::SignedInt);
+        format.setCodec("audio/pcm");
+        format.setByteOrder(QAudioFormat::LittleEndian);
+
+        m_input = std::make_unique<QAudioInput>(m_audioDevices.at(m_ui.comboBoxDevices->currentIndex()), format);
+        m_input->start(&m_device);
+        m_input->setBufferSize(format.sampleRate()/60*sizeof(qint16)*2);
+        m_ui.comboBoxDevices->setEnabled(false);
+        m_ui.comboBoxSamplerate->setEnabled(false);
+        m_ui.pushButtonToggle->setText("▮▮");
+    }
+}
+
+MainWindow::~MainWindow() = default;

mainwindow.h

@@ -0,0 +1,35 @@
+#pragma once
+
+#include <QMainWindow>
+
+#include <memory>
+
+#include "device.h"
+#include "ui_mainwindow.h"
+
+class QAudioInput;
+class QAudioFormat;
+class QAudioDeviceInfo;
+namespace Ui { class MainWindow; }
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    explicit MainWindow(QWidget *parent = nullptr);
+    ~MainWindow() override;
+
+private slots:
+    void toggle();
+
+private:
+    Ui::MainWindow m_ui;
+
+    std::unique_ptr<QAudioInput> m_input;
+
+    Device m_device;
+    //FakeDevice m_fakeDevice;
+
+    const QList<QAudioDeviceInfo> m_audioDevices;
+};

mainwindow.ui

@@ -0,0 +1,159 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>MainWindow</class>
+ <widget class="QMainWindow" name="MainWindow">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>800</width>
+    <height>600</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>MainWindow</string>
+  </property>
+  <widget class="QWidget" name="centralwidget">
+   <layout class="QVBoxLayout" name="verticalLayout" stretch="0,1">
+    <property name="leftMargin">
+     <number>0</number>
+    </property>
+    <property name="topMargin">
+     <number>0</number>
+    </property>
+    <property name="rightMargin">
+     <number>0</number>
+    </property>
+    <property name="bottomMargin">
+     <number>0</number>
+    </property>
+    <item>
+     <layout class="QHBoxLayout" name="horizontalLayout">
+      <item>
+       <widget class="QLabel" name="labelDevice">
+        <property name="text">
+         <string>Device:</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QComboBox" name="comboBoxDevices"/>
+      </item>
+      <item>
+       <widget class="QComboBox" name="comboBoxSamplerate"/>
+      </item>
+      <item>
+       <widget class="QPushButton" name="pushButtonToggle">
+        <property name="text">
+         <string>PushButton</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <spacer name="horizontalSpacer">
+        <property name="orientation">
+         <enum>Qt::Horizontal</enum>
+        </property>
+        <property name="sizeHint" stdset="0">
+         <size>
+          <width>40</width>
+          <height>20</height>
+         </size>
+        </property>
+       </spacer>
+      </item>
+      <item>
+       <widget class="QComboBox" name="comboBoxFps"/>
+      </item>
+      <item>
+       <widget class="QSpinBox" name="spinBoxBlend">
+        <property name="suffix">
+         <string> blend</string>
+        </property>
+        <property name="maximum">
+         <number>255</number>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <spacer name="horizontalSpacer_2">
+        <property name="orientation">
+         <enum>Qt::Horizontal</enum>
+        </property>
+        <property name="sizeHint" stdset="0">
+         <size>
+          <width>40</width>
+          <height>20</height>
+         </size>
+        </property>
+       </spacer>
+      </item>
+      <item>
+       <widget class="QRadioButton" name="radioButtonScale50">
+        <property name="text">
+         <string>X.5</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QRadioButton" name="radioButtonScale100">
+        <property name="text">
+         <string>X1</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QRadioButton" name="radioButtonScale200">
+        <property name="text">
+         <string>X2</string>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QRadioButton" name="radioButtonScale400">
+        <property name="text">
+         <string>X4</string>
+        </property>
+       </widget>
+      </item>
+     </layout>
+    </item>
+    <item>
+     <widget class="OsciWidget" name="widget" native="true"/>
+    </item>
+   </layout>
+  </widget>
+  <widget class="QMenuBar" name="menubar">
+   <property name="geometry">
+    <rect>
+     <x>0</x>
+     <y>0</y>
+     <width>800</width>
+     <height>20</height>
+    </rect>
+   </property>
+  </widget>
+  <widget class="QStatusBar" name="statusbar"/>
+  <widget class="QToolBar" name="toolBar">
+   <property name="windowTitle">
+    <string>toolBar</string>
+   </property>
+   <attribute name="toolBarArea">
+    <enum>TopToolBarArea</enum>
+   </attribute>
+   <attribute name="toolBarBreak">
+    <bool>false</bool>
+   </attribute>
+  </widget>
+ </widget>
+ <customwidgets>
+  <customwidget>
+   <class>OsciWidget</class>
+   <extends>QWidget</extends>
+   <header>osciwidget.h</header>
+   <container>1</container>
+  </customwidget>
+ </customwidgets>
+ <resources/>
+ <connections/>
+</ui>

oscilloscope.pro

@@ -6,10 +6,15 @@ DEFINES += QT_DEPRECATED_WARNINGS QT_DISABLE_DEPRECATED_BEFORE=0x060000
 SOURCES += \
         device.cpp \
         main.cpp \
+        mainwindow.cpp \
         osciwidget.cpp
 
 HEADERS += \
     device.h \
+    mainwindow.h \
     osciwidget.h
 
 STATECHARTS +=
+
+FORMS += \
+    mainwindow.ui

osciwidget.cpp

@@ -5,10 +5,6 @@
 #include <QLine>
 
 namespace {
-constexpr auto framerate = 60;
-constexpr auto blend = 190;
-}
-
 template<typename T>
 auto pythagoras(const T &dx, const T &dy)
 {
@@ -19,15 +15,60 @@ auto pythagoras(const QLine &line)
 {
     return pythagoras(line.dx(), line.dy());
 }
-
-OsciWidget::OsciWidget(QWidget *parent) :
-    QWidget(parent), m_timerId(startTimer(1000/framerate))
-{
-    resizePixmap();
-    m_timer.start();
 }
 
-void OsciWidget::samplesReceived(const SamplePair *begin, const SamplePair *end)
+OsciWidget::OsciWidget(QWidget *parent) :
+    QWidget(parent)
+{
+    restartTimer();
+    resizePixmap();
+    createBlendPixmap();
+}
+
+int OsciWidget::framerate() const
+{
+    return m_framerate;
+}
+
+int OsciWidget::blend() const
+{
+    return m_blend;
+}
+
+float OsciWidget::factor() const
+{
+    return m_factor;
+}
+
+void OsciWidget::setFramerate(int framerate)
+{
+    if (framerate == m_framerate)
+        return;
+
+    qDebug() << "change framerate to" << framerate;
+
+    m_framerate = framerate;
+
+    restartTimer();
+}
+
+void OsciWidget::setBlend(int blend)
+{
+    if (blend == m_blend)
+        return;
+
+    qDebug() << "change blend to" << blend;
+
+    m_blend = blend;
+    createBlendPixmap();
+}
+
+void OsciWidget::setFactor(float factor)
+{
+    m_factor = factor;
+}
+
+void OsciWidget::renderSamples(const SamplePair *begin, const SamplePair *end)
 {
     QPainter painter;
     painter.begin(&m_pixmap);
@@ -38,8 +79,8 @@ void OsciWidget::samplesReceived(const SamplePair *begin, const SamplePair *end)
 
     for (auto i = begin; i < end; i++)
     {
-        const qint32 x = (float(i->x) / std::numeric_limits<qint16>::max() / 2 * width() * 2) + (width() / 2);
-        const qint32 y = (float(-i->y) / std::numeric_limits<qint16>::max() / 2 * height() * 2) + (height() / 2);
+        const qint32 x = (float(i->x) / std::numeric_limits<qint16>::max() / 2 * width() / 2 * m_factor) + (width() / 2);
+        const qint32 y = (float(-i->y) / std::numeric_limits<qint16>::max() / 2 * height() / 2 * m_factor) + (height() / 2);
         const QPoint p{x,y};
 
         if (Q_LIKELY(m_lastPoint.has_value()))
@@ -58,12 +99,6 @@ void OsciWidget::samplesReceived(const SamplePair *begin, const SamplePair *end)
     }
 
     painter.end();
-
-    if (m_timer.hasExpired(1000/framerate))
-    {
-        repaint();
-        m_timer.restart();
-    }
 }
 
 void OsciWidget::paintEvent(QPaintEvent *event)
@@ -85,7 +120,7 @@ void OsciWidget::timerEvent(QTimerEvent *event)
 {
     if (event->timerId() == m_timerId)
     {
-        //repaint();
+        repaint();
     }
     else
         QWidget::timerEvent(event);
@@ -96,13 +131,25 @@ void OsciWidget::resizeEvent(QResizeEvent *event)
     Q_UNUSED(event)
 
     resizePixmap();
+    createBlendPixmap();
+}
+
+void OsciWidget::restartTimer()
+{
+    if (m_timerId != -1)
+        killTimer(m_timerId);
+
+    m_timerId = startTimer(1000/m_framerate);
 }
 
 void OsciWidget::resizePixmap()
 {
     m_pixmap = QPixmap(size());
     m_pixmap.fill(QColor());
-
-    m_fadeoutPixmap = QPixmap(size());
-    m_fadeoutPixmap.fill(QColor(blend, blend, blend));
+}
+
+void OsciWidget::createBlendPixmap()
+{
+    m_fadeoutPixmap = QPixmap(size());
+    m_fadeoutPixmap.fill(QColor(m_blend, m_blend, m_blend));
 }

osciwidget.h

@@ -19,8 +19,16 @@ class OsciWidget : public QWidget
 public:
     explicit OsciWidget(QWidget *parent = nullptr);
 
+    int framerate() const;
+    int blend() const;
+    float factor() const;
+
 public slots:
-    void samplesReceived(const SamplePair *begin, const SamplePair *end);
+    void setFramerate(int framerate);
+    void setBlend(int blend);
+    void setFactor(float factor);
+
+    void renderSamples(const SamplePair *begin, const SamplePair *end);
 
 protected:
     void paintEvent(QPaintEvent *event) override;
@@ -28,13 +36,17 @@ protected:
     void resizeEvent(QResizeEvent *event) override;
 
 private:
+    void restartTimer();
     void resizePixmap();
+    void createBlendPixmap();
+
+    int m_timerId{-1};
+    int m_framerate{15};
+    int m_blend{190};
+    float m_factor{4.f};
 
-    const int m_timerId;
     QPixmap m_pixmap;
     QPixmap m_fadeoutPixmap;
 
     std::optional<QPoint> m_lastPoint;
-
-    QElapsedTimer m_timer;
 };