commit ee912d70abd8ba90ee04027e501aa9d26d506c54
Author: Jan Grewe <jan.grewe@g-node.org>
Date:   Wed Mar 11 09:52:56 2020 +0100

    initial commit

diff --git a/images/connect.png b/images/connect.png
new file mode 100644
index 0000000..29cf8cb
Binary files /dev/null and b/images/connect.png differ
diff --git a/images/disconnect.png b/images/disconnect.png
new file mode 100644
index 0000000..08f6c8d
Binary files /dev/null and b/images/disconnect.png differ
diff --git a/imageviewer.cpp b/imageviewer.cpp
new file mode 100644
index 0000000..726aa93
--- /dev/null
+++ b/imageviewer.cpp
@@ -0,0 +1,373 @@
+#include "imageviewer.h"
+
+#include <QApplication>
+#include <QClipboard>
+//nclude <QColorSpace>
+#include <QDir>
+#include <QFileDialog>
+#include <QImageReader>
+#include <QImageWriter>
+#include <QLabel>
+#include <QMenuBar>
+#include <QMessageBox>
+#include <QMimeData>
+#include <QPainter>
+#include <QScreen>
+#include <QScrollArea>
+#include <QScrollBar>
+#include <QStandardPaths>
+#include <QStatusBar>
+#include <QToolBar>
+#include <iostream>
+
+#if defined(QT_PRINTSUPPORT_LIB)
+#  include <QtPrintSupport/qtprintsupportglobal.h>
+
+#  if QT_CONFIG(printdialog)
+#    include <QPrintDialog>
+#  endif
+#endif
+
+ImageViewer::ImageViewer(QWidget *parent)
+  : QMainWindow(parent), imageLabel(new QLabel), scrollArea(new QScrollArea)
+{
+  imageLabel->setBackgroundRole(QPalette::Base);
+  imageLabel->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);
+  imageLabel->setScaledContents(true);
+
+  scrollArea->setBackgroundRole(QPalette::Dark);
+  scrollArea->setWidget(imageLabel);
+  scrollArea->setVisible(false);
+  setCentralWidget(scrollArea);
+  pylon = new PylonRecorder();
+  createActions();
+  updateActions();
+  resize(QGuiApplication::primaryScreen()->availableSize() * 3 / 5);
+
+}
+
+ImageViewer::~ImageViewer(){
+  delete pylon;
+}
+
+bool ImageViewer::loadFile(const QString &fileName) {
+  QImageReader reader(fileName);
+  reader.setAutoTransform(true);
+  const QImage newImage = reader.read();
+  if (newImage.isNull()) {
+      QMessageBox::information(this, QGuiApplication::applicationDisplayName(),
+                               tr("Cannot load %1: %2")
+                               .arg(QDir::toNativeSeparators(fileName), reader.errorString()));
+      return false;
+    }
+
+  setImage(newImage);
+
+  setWindowFilePath(fileName);
+
+  const QString message = tr("Opened \"%1\", %2x%3, Depth: %4")
+      .arg(QDir::toNativeSeparators(fileName)).arg(image.width()).arg(image.height()).arg(image.depth());
+  statusBar()->showMessage(message);
+  return true;
+}
+
+void ImageViewer::setImage(const QImage &newImage) {
+  image = newImage;
+  // (image.colorSpace().isValid())
+  //  image.convertToColorSpace(QColorSpace::SRgb);
+  imageLabel->setPixmap(QPixmap::fromImage(image));
+  scaleFactor = 1.0;
+
+  scrollArea->setVisible(true);
+  printAct->setEnabled(true);
+  fitToWindowAct->setEnabled(true);
+  updateActions();
+
+  if (!fitToWindowAct->isChecked())
+    imageLabel->adjustSize();
+}
+
+bool ImageViewer::saveFile(const QString &fileName) {
+  QImageWriter writer(fileName);
+
+  if (!writer.write(image)) {
+      QMessageBox::information(this, QGuiApplication::applicationDisplayName(),
+                               tr("Cannot write %1: %2")
+                               .arg(QDir::toNativeSeparators(fileName)), writer.errorString());
+      return false;
+    }
+  const QString message = tr("Wrote \"%1\"").arg(QDir::toNativeSeparators(fileName));
+  statusBar()->showMessage(message);
+  return true;
+}
+
+static void initializeImageFileDialog(QFileDialog &dialog, QFileDialog::AcceptMode acceptMode) {
+  static bool firstDialog = true;
+
+  if (firstDialog) {
+      firstDialog = false;
+      const QStringList picturesLocations = QStandardPaths::standardLocations(QStandardPaths::PicturesLocation);
+      dialog.setDirectory(picturesLocations.isEmpty() ? QDir::currentPath() : picturesLocations.last());
+    }
+
+  QStringList mimeTypeFilters;
+  const QByteArrayList supportedMimeTypes = acceptMode == QFileDialog::AcceptOpen
+      ? QImageReader::supportedMimeTypes() : QImageWriter::supportedMimeTypes();
+  for (const QByteArray &mimeTypeName : supportedMimeTypes)
+    mimeTypeFilters.append(mimeTypeName);
+  mimeTypeFilters.sort();
+  dialog.setMimeTypeFilters(mimeTypeFilters);
+  dialog.selectMimeTypeFilter("image/jpeg");
+  if (acceptMode == QFileDialog::AcceptSave)
+    dialog.setDefaultSuffix("jpg");
+}
+
+void ImageViewer::open() {
+  QFileDialog dialog(this, tr("Open File"));
+  initializeImageFileDialog(dialog, QFileDialog::AcceptOpen);
+
+  while (dialog.exec() == QDialog::Accepted && !loadFile(dialog.selectedFiles().first())) {}
+}
+
+void ImageViewer::saveAs() {
+  QFileDialog dialog(this, tr("Save File As"));
+  initializeImageFileDialog(dialog, QFileDialog::AcceptSave);
+
+  while (dialog.exec() == QDialog::Accepted && !saveFile(dialog.selectedFiles().first())) {}
+}
+
+void ImageViewer::print() {
+  Q_ASSERT(imageLabel->pixmap());
+#if defined(QT_PRINTSUPPORT_LIB) && QT_CONFIG(printdialog)
+
+  QPrintDialog dialog(&printer, this);
+
+  if (dialog.exec()) {
+      QPainter painter(&printer);
+      QRect rect = painter.viewport();
+      QSize size = imageLabel->pixmap()->size();
+      size.scale(rect.size(), Qt::KeepAspectRatio);
+      painter.setViewport(rect.x(), rect.y(), size.width(), size.height());
+      painter.setWindow(imageLabel->pixmap()->rect());
+      painter.drawPixmap(0, 0, *imageLabel->pixmap());
+    }
+#endif
+}
+
+void ImageViewer::copy() {
+#ifndef QT_NO_CLIPBOARD
+  QGuiApplication::clipboard()->setImage(image);
+#endif // !QT_NO_CLIPBOARD
+}
+
+#ifndef QT_NO_CLIPBOARD
+static QImage clipboardImage() {
+  if (const QMimeData *mimeData = QGuiApplication::clipboard()->mimeData()) {
+      if (mimeData->hasImage()) {
+          const QImage image = qvariant_cast<QImage>(mimeData->imageData());
+          if (!image.isNull())
+            return image;
+        }
+    }
+  return QImage();
+}
+#endif // !QT_NO_CLIPBOARD
+
+void ImageViewer::paste() {
+#ifndef QT_NO_CLIPBOARD
+  const QImage newImage = clipboardImage();
+  if (newImage.isNull()) {
+      statusBar()->showMessage(tr("No image in clipboard"));
+    } else {
+      setImage(newImage);
+      setWindowFilePath(QString());
+      const QString message = tr("Obtained image from clipboard, %1x%2, Depth: %3")
+          .arg(newImage.width()).arg(newImage.height()).arg(newImage.depth());
+      statusBar()->showMessage(message);
+    }
+#endif // !QT_NO_CLIPBOARD
+}
+
+void ImageViewer::zoomIn() {
+  scaleImage(1.25);
+}
+
+void ImageViewer::zoomOut()
+{
+  scaleImage(0.8);
+}
+
+void ImageViewer::normalSize() {
+  imageLabel->adjustSize();
+  scaleFactor = 1.0;
+}
+
+void ImageViewer::fitToWindow() {
+  bool fitToWindow = fitToWindowAct->isChecked();
+  scrollArea->setWidgetResizable(fitToWindow);
+  if (!fitToWindow)
+    normalSize();
+  updateActions();
+}
+
+void ImageViewer::about() {
+  QMessageBox::about(this, tr("About Image Viewer"),
+                     tr("<p>The <b>Image Viewer</b> example shows how to combine QLabel "
+                        "and QScrollArea to display an image. QLabel is typically used "
+                        "for displaying a text, but it can also display an image. "
+                        "QScrollArea provides a scrolling view around another widget. "
+                        "If the child widget exceeds the size of the frame, QScrollArea "
+                        "automatically provides scroll bars. </p><p>The example "
+                        "demonstrates how QLabel's ability to scale its contents "
+                        "(QLabel::scaledContents), and QScrollArea's ability to "
+                        "automatically resize its contents "
+                        "(QScrollArea::widgetResizable), can be used to implement "
+                        "zooming and scaling features. </p><p>In addition the example "
+                        "shows how to use QPainter to print an image.</p>"));
+}
+
+void ImageViewer::createActions() {
+  const QIcon connect_icon(":/images/connect.png");
+  const QIcon disconnect_icon(":/images/disconnect.png");
+
+  QMenu *fileMenu = menuBar()->addMenu(tr("&File"));
+
+  QAction *openAct = fileMenu->addAction(tr("&Open..."), this, &ImageViewer::open);
+  openAct->setShortcut(QKeySequence::Open);
+
+  saveAsAct = fileMenu->addAction(tr("&Save As..."), this, &ImageViewer::saveAs);
+  saveAsAct->setEnabled(false);
+
+  printAct = fileMenu->addAction(tr("&Print..."), this, &ImageViewer::print);
+  printAct->setShortcut(QKeySequence::Print);
+  printAct->setEnabled(false);
+
+  fileMenu->addSeparator();
+
+  QAction *exitAct = fileMenu->addAction(tr("E&xit"), this, &ImageViewer::quitApplication);
+  exitAct->setShortcut(tr("Ctrl+Q"));
+
+  QMenu *editMenu = menuBar()->addMenu(tr("&Edit"));
+
+  copyAct = editMenu->addAction(tr("&Copy"), this, &ImageViewer::copy);
+  copyAct->setShortcut(QKeySequence::Copy);
+  copyAct->setEnabled(false);
+
+  QAction *pasteAct = editMenu->addAction(tr("&Paste"), this, &ImageViewer::paste);
+  pasteAct->setShortcut(QKeySequence::Paste);
+
+  QMenu *viewMenu = menuBar()->addMenu(tr("&View"));
+
+  zoomInAct = viewMenu->addAction(tr("Zoom &In (25%)"), this, &ImageViewer::zoomIn);
+  zoomInAct->setShortcut(QKeySequence::ZoomIn);
+  zoomInAct->setEnabled(false);
+
+  zoomOutAct = viewMenu->addAction(tr("Zoom &Out (25%)"), this, &ImageViewer::zoomOut);
+  zoomOutAct->setShortcut(QKeySequence::ZoomOut);
+  zoomOutAct->setEnabled(false);
+
+  normalSizeAct = viewMenu->addAction(tr("&Normal Size"), this, &ImageViewer::normalSize);
+  normalSizeAct->setShortcut(tr("Ctrl+S"));
+  normalSizeAct->setEnabled(false);
+
+  viewMenu->addSeparator();
+
+  fitToWindowAct = viewMenu->addAction(tr("&Fit to Window"), this, &ImageViewer::fitToWindow);
+  fitToWindowAct->setEnabled(false);
+  fitToWindowAct->setCheckable(true);
+  fitToWindowAct->setShortcut(tr("Ctrl+F"));
+
+  QMenu *camera_menu = menuBar()->addMenu(tr("&Camera"));
+  connect_camera_action = camera_menu->addAction(connect_icon, tr("&Connect"), this, &ImageViewer::connectCamera);
+  connect_camera_action->setStatusTip(tr("Connect to to camera and open device"));
+  disconnect_camera_action = camera_menu->addAction(disconnect_icon, tr("&Disconnect"), this, &ImageViewer::disconnectCamera);
+  disconnect_camera_action->setStatusTip(tr("Disconnect from the camera device"));
+  camera_menu->addSeparator();
+  grab_still_action = camera_menu->addAction(tr("&Grab still"), this, &ImageViewer::grabStillFromPylon);
+  grab_still_action->setStatusTip(tr("Grab single image from Pylon camera"));
+  grab_still_action->setShortcut(tr("Ctrl+ "));
+  grab_continuous_action = camera_menu->addAction(tr("&grab continuous"), this, &ImageViewer::startRecording);
+  grab_continuous_action->setShortcut(tr("Ctrl+Enter"));
+
+  QMenu *helpMenu = menuBar()->addMenu(tr("&Help"));
+  helpMenu->addAction(tr("&About"), this, &ImageViewer::about);
+  helpMenu->addAction(tr("About &Qt"), &QApplication::aboutQt);
+
+  QToolBar *toolbar = addToolBar("main toolbar");
+  toolbar->addSeparator();
+  toolbar->addAction(connect_camera_action);
+  toolbar->addAction(disconnect_camera_action);
+  toolbar->addSeparator();
+  toolbar->addAction(grab_still_action);
+}
+
+void ImageViewer::updateActions() {
+  saveAsAct->setEnabled(!image.isNull());
+  copyAct->setEnabled(!image.isNull());
+  zoomInAct->setEnabled(!fitToWindowAct->isChecked());
+  zoomOutAct->setEnabled(!fitToWindowAct->isChecked());
+  normalSizeAct->setEnabled(!fitToWindowAct->isChecked());
+  disconnect_camera_action->setEnabled(pylon->isOpen());
+  connect_camera_action->setEnabled(!pylon->isOpen());
+  grab_still_action->setEnabled(pylon->isOpen());
+  grab_continuous_action->setEnabled(false);
+}
+
+void ImageViewer::scaleImage(double factor) {
+  Q_ASSERT(imageLabel->pixmap());
+  scaleFactor *= factor;
+  imageLabel->resize(scaleFactor * imageLabel->pixmap()->size());
+
+  adjustScrollBar(scrollArea->horizontalScrollBar(), factor);
+  adjustScrollBar(scrollArea->verticalScrollBar(), factor);
+
+  zoomInAct->setEnabled(scaleFactor < 3.0);
+  zoomOutAct->setEnabled(scaleFactor > 0.333);
+}
+
+void ImageViewer::quitApplication() {
+  if (pylon->isOpen()) {
+    pylon->closeCamera();
+  }
+  //pylon->terminate();
+  this->close();
+}
+
+void ImageViewer::adjustScrollBar(QScrollBar *scrollBar, double factor) {
+  scrollBar->setValue(int(factor * scrollBar->value()
+                          + ((factor - 1) * scrollBar->pageStep()/2)));
+}
+
+void ImageViewer::connectCamera() {
+  std::string message;
+  pylon->openCamera(message);
+  statusBar()->showMessage(QString::fromStdString(message));
+  updateActions();
+}
+
+
+void ImageViewer::disconnectCamera() {
+  pylon->closeCamera();
+  statusBar()->showMessage(tr("Camera closed!"));
+  updateActions();
+}
+
+void ImageViewer::startRecording() {}
+
+void ImageViewer::stopRecording() {}
+
+void ImageViewer::grabStillFromPylon() {
+  if (pylon->isOpen()) {
+      ImageSettings settings = pylon->getImageSettings();
+      Pylon::CGrabResultPtr image_ptr = pylon->grabFrame();
+      if (image_ptr.IsValid() && image_ptr->GrabSucceeded()) {
+          size_t stride;
+          image_ptr->GetStride(stride);
+          QImage img(static_cast<uchar *>(image_ptr->GetBuffer()), static_cast<int>(settings.width), static_cast<int>(settings.height),
+                     QImage::Format::Format_Grayscale8);
+          setImage(img);
+        }
+    } else {
+      statusBar()->showMessage(tr("Camera is not open! Connect to camera first!"));
+    }
+}
diff --git a/imageviewer.h b/imageviewer.h
new file mode 100644
index 0000000..1e9728b
--- /dev/null
+++ b/imageviewer.h
@@ -0,0 +1,86 @@
+#ifndef IMAGEVIEWER_H
+#define IMAGEVIEWER_H
+
+#include <QMainWindow>
+#include "pylonrecorder.h"
+#include <QImage>
+#if defined(QT_PRINTSUPPORT_LIB)
+#  include <QtPrintSupport/qtprintsupportglobal.h>
+
+#  if QT_CONFIG(printer)
+#    include <QPrinter>
+#  endif
+#endif
+
+QT_BEGIN_NAMESPACE
+class QAction;
+class QLabel;
+class QMenu;
+class QScrollArea;
+class QScrollBar;
+QT_END_NAMESPACE
+
+//! [0]
+class ImageViewer : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    ImageViewer(QWidget *parent = nullptr);
+    ~ImageViewer();
+
+    bool loadFile(const QString &);
+
+private slots:
+    void grabStillFromPylon();
+    void open();
+    void saveAs();
+    void print();
+    void copy();
+    void paste();
+    void zoomIn();
+    void zoomOut();
+    void normalSize();
+    void fitToWindow();
+    void about();
+    void connectCamera();
+    void disconnectCamera();
+    void startRecording();
+    void stopRecording();
+    void quitApplication();
+
+private:
+    void createActions();
+    void createMenus();
+    void createToolBar();
+    void updateActions();
+
+    bool saveFile(const QString &fileName);
+    void setImage(const QImage &newImage);
+    void scaleImage(double factor);
+    void adjustScrollBar(QScrollBar *scrollBar, double factor);
+
+    QImage image;
+    QLabel *imageLabel;
+    QScrollArea *scrollArea;
+    double scaleFactor = 1;
+    PylonRecorder *pylon;
+
+#if defined(QT_PRINTSUPPORT_LIB) && QT_CONFIG(printer)
+    QPrinter printer;
+#endif
+
+    QAction *saveAsAct;
+    QAction *printAct;
+    QAction *copyAct;
+    QAction *zoomInAct;
+    QAction *zoomOutAct;
+    QAction *normalSizeAct;
+    QAction *fitToWindowAct;
+    QAction *grab_still_action;
+    QAction *grab_continuous_action;
+    QAction *connect_camera_action;
+    QAction *disconnect_camera_action;
+};
+
+#endif
diff --git a/main.cpp b/main.cpp
new file mode 100644
index 0000000..7fd1c93
--- /dev/null
+++ b/main.cpp
@@ -0,0 +1,22 @@
+#include "imageviewer.h"
+#include <QApplication>
+#include <QCommandLineParser>
+#include <pylon/PylonIncludes.h>
+
+int main(int argc, char *argv[])
+{
+    QApplication app(argc, argv);
+    QGuiApplication::setApplicationDisplayName(ImageViewer::tr("Image Viewer"));
+    QCommandLineParser commandLineParser;
+    commandLineParser.addHelpOption();
+    commandLineParser.addPositionalArgument(ImageViewer::tr("[file]"), ImageViewer::tr("Image file to open."));
+    commandLineParser.process(QCoreApplication::arguments());
+    ImageViewer imageViewer;
+    if (!commandLineParser.positionalArguments().isEmpty()
+            && !imageViewer.loadFile(commandLineParser.positionalArguments().front())) {
+        return -1;
+    }
+    imageViewer.show();
+    int ret = app.exec();
+    return ret;
+}
diff --git a/pylonrecorder.cpp b/pylonrecorder.cpp
new file mode 100644
index 0000000..be2111e
--- /dev/null
+++ b/pylonrecorder.cpp
@@ -0,0 +1,71 @@
+#include "pylonrecorder.h"
+
+PylonRecorder::PylonRecorder():
+  valid(false) {
+  Pylon::PylonInitialize();
+  camera = new Pylon::CInstantCamera();
+}
+
+PylonRecorder::~PylonRecorder() {
+  Pylon::PylonTerminate();
+}
+
+void PylonRecorder::terminate() {
+  try {
+    //Pylon::PylonTerminate();
+  } catch (const Pylon::GenericException &e) {
+    std::cerr << e.GetDescription() << std::endl;
+  }
+}
+
+bool PylonRecorder::isOpen() {
+  return valid;
+}
+
+ImageSettings PylonRecorder::getImageSettings() {
+  ImageSettings settings;
+  if (valid) {
+    Pylon::CIntegerParameter width( camera->GetNodeMap(), "Width");
+    Pylon::CIntegerParameter height( camera->GetNodeMap(), "Height");
+    Pylon::CEnumParameter pixelFormat( camera->GetNodeMap(), "PixelFormat");
+    settings.width = width.GetValue();
+    settings.height = height.GetValue();
+  }
+  return settings;
+}
+
+Pylon::CGrabResultPtr PylonRecorder::grabFrame() {
+  Pylon::CPylonImage img;
+  Pylon::CGrabResultPtr ptrGrabResult;
+  if (valid) {
+    camera->StartGrabbing();
+    camera->RetrieveResult( 5000, ptrGrabResult, Pylon::TimeoutHandling_ThrowException);
+    camera->StopGrabbing();
+  }
+  return ptrGrabResult;
+}
+
+bool PylonRecorder::openCamera(std::string &message) {
+  try {
+    camera->Attach(Pylon::CTlFactory::GetInstance().CreateFirstDevice());
+    camera->Open();
+    valid = true;
+    message = "Successfully opened camera!";
+  } catch (const Pylon::GenericException &e) {
+    message = e.GetDescription();
+    std::cerr << "An exception occurred." << std::endl << e.GetDescription() << std::endl;
+    valid = false;
+  }
+  return valid;
+}
+
+void PylonRecorder::closeCamera() {
+  if (camera->IsOpen()) {
+      try {
+        camera->Close();
+        valid = false;
+      } catch (const Pylon::GenericException &e) {
+        std::cerr << "An exception occurred." << std::endl << e.GetDescription() << std::endl;
+      }
+    }
+}
diff --git a/pylonrecorder.h b/pylonrecorder.h
new file mode 100644
index 0000000..bb3d2d8
--- /dev/null
+++ b/pylonrecorder.h
@@ -0,0 +1,33 @@
+#ifndef PYLONRECORDER_H
+#define PYLONRECORDER_H
+
+#include <pylon/PylonIncludes.h>
+#include <pylon/BaslerUniversalInstantCamera.h>
+
+struct ImageSettings {
+  int64_t width = 0;
+  int64_t height = 0;
+};
+
+class PylonRecorder
+{
+public:
+    PylonRecorder();
+    ~PylonRecorder();
+
+    ImageSettings getImageSettings();
+    bool isOpen();
+    void terminate();
+    bool openCamera(std::string &message);
+    void closeCamera();
+    Pylon::CGrabResultPtr grabFrame();
+
+private:
+    Pylon::CInstantCamera *camera;
+    bool valid;
+
+
+
+};
+
+#endif // PYLONRECORDER_H
diff --git a/recorder.pro b/recorder.pro
new file mode 100644
index 0000000..c13e909
--- /dev/null
+++ b/recorder.pro
@@ -0,0 +1,21 @@
+QT += widgets
+requires(qtConfig(filedialog))
+qtHaveModule(printsupport): QT += gui printsupport
+
+HEADERS       = imageviewer.h \
+    pylonrecorder.h
+SOURCES       = imageviewer.cpp \
+                main.cpp \
+                pylonrecorder.cpp
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/widgets/widgets/imageviewer
+INSTALLS += target
+
+unix:!macx: LIBS += -L$$/opt/pylon5/lib64/ -Wl,-E -lpylonbase -lpylonutility -lGenApi_gcc_v3_1_Basler_pylon -lGCBase_gcc_v3_1_Basler_pylon
+
+INCLUDEPATH += $$/opt/pylon5/include
+DEPENDPATH += $$/opt/pylon5/include
+
+RESOURCES += \
+    resources.qrc
diff --git a/resources.qrc b/resources.qrc
new file mode 100644
index 0000000..12ca9e0
--- /dev/null
+++ b/resources.qrc
@@ -0,0 +1,6 @@
+<RCC>
+    <qresource prefix="/">
+        <file>images/disconnect.png</file>
+        <file>images/connect.png</file>
+    </qresource>
+</RCC>