New command line options --help, --version

Also update version to 0.1 in preparation for first release.

README.rst

@@ -87,6 +87,7 @@ Various things which would be nice to do, in no particular order
   * Threaded rendering for better responsiveness
   * Autotune simplification quality based on total points
   * Approximate ambient occlusion (?)
+  * Fix GLSL deprecation warnings for builtin variables
 
 * GUI
 

config.h.in.cmake

@@ -1 +1,2 @@
+#define DISPLAZ_VERSION_STRING "0.1"
 #define DISPLAZ_SHADER_BASE_PATH "@DISPLAZ_SHADER_BASE_PATH@"

main.cpp

@@ -35,6 +35,7 @@
 #include <QtOpenGL/QGLFormat>
 
 #include "argparse.h"
+#include "config.h"
 
 
 QStringList g_initialFileNames;
@@ -51,13 +52,17 @@ int main(int argc, char *argv[])
     QApplication app(argc, argv);
 
     ArgParse::ArgParse ap;
+    bool printVersion = false;
+    bool printHelp = false;
     int maxPointCount = 200000000;
 
     ap.options(
         "displaz - view a LAS point cloud\n"
-        "Usage: displaz [opts] file1.las [file2.las ...]",
+        "Usage: displaz [opts] [file1.las ...]",
         "%*", storeFileName, "",
-        "-maxpoints %d", &maxPointCount, "Maximum number of points to load at a time",
+        "--maxpoints %d", &maxPointCount, "Maximum number of points to load at a time",
+        "--version",      &printVersion,  "Print version number",
+        "--help",         &printHelp,     "Print command line usage help",
         NULL
     );
 
@@ -68,6 +73,17 @@ int main(int argc, char *argv[])
         return EXIT_FAILURE;
     }
 
+    if (printVersion)
+    {
+        std::cout << "version " DISPLAZ_VERSION_STRING "\n";
+        return EXIT_SUCCESS;
+    }
+    if (printHelp)
+    {
+        ap.usage();
+        return EXIT_SUCCESS;
+    }
+
     // Turn on multisampled antialiasing - this makes rendered point clouds
     // look much nicer.
     QGLFormat f = QGLFormat::defaultFormat();

mainwindow.cpp

@@ -316,7 +316,10 @@ void PointViewerMainWindow::helpDialog()
 
 void PointViewerMainWindow::aboutDialog()
 {
-    QString message = tr("Displaz - a qt-based las viewer\nversion 0.0.1");
+    QString message = tr(
+        "<p><b>Displaz</b> - a LiDAR viewer for geographic data</p>"
+        "<p>version " DISPLAZ_VERSION_STRING "</p>"
+    );
     QMessageBox::information(this, tr("About displaz"), message);
 }