add image viewer dialog for write_dump image output, help can open link to manual

tools/lammps-gui/imageviewer.h

@@ -0,0 +1,64 @@
+/* -*- c++ -*- ----------------------------------------------------------
+   LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
+   https://www.lammps.org/, Sandia National Laboratories
+   LAMMPS development team: developers@lammps.org
+
+   Copyright (2003) Sandia Corporation.  Under the terms of Contract
+   DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
+   certain rights in this software.  This software is distributed under
+   the GNU General Public License.
+
+   See the README file in the top-level LAMMPS directory.
+------------------------------------------------------------------------- */
+
+#ifndef IMAGEVIEWER_H
+#define IMAGEVIEWER_H
+
+#include <QDialog>
+#include <QImage>
+
+class QAction;
+class QMenuBar;
+class QDialogButtonBox;
+class QLabel;
+class QScrollArea;
+class QScrollBar;
+class QStatusBar;
+
+class ImageViewer : public QDialog {
+    Q_OBJECT
+
+public:
+    explicit ImageViewer(const QString &fileName, QWidget *parent = nullptr);
+
+private slots:
+    void saveAs();
+    void copy();
+    void zoomIn();
+    void zoomOut();
+    void normalSize();
+    void fitToWindow();
+
+private:
+    void createActions();
+    void updateActions();
+    void saveFile(const QString &fileName);
+    void scaleImage(double factor);
+    void adjustScrollBar(QScrollBar *scrollBar, double factor);
+
+private:
+    QImage image;
+    QMenuBar *menuBar;
+    QLabel *imageLabel;
+    QScrollArea *scrollArea;
+    QDialogButtonBox *buttonBox;
+    double scaleFactor = 1.0;
+
+    QAction *saveAsAct;
+    QAction *copyAct;
+    QAction *zoomInAct;
+    QAction *zoomOutAct;
+    QAction *normalSizeAct;
+    QAction *fitToWindowAct;
+};
+#endif