Feature tracker item 1885951:

Added LogSize option to celestia.cfg. The value of LogSize controls the number of rows in Celestia's console log. Added comment and usage example to celestia.cfg.

celestia.cfg

@@ -326,6 +326,13 @@ StarTextures
 # IgnoreGLExtensions [ "GL_ARB_vertex_program" ]
 
 
+#------------------------------------------------------------------------
+# The number of rows in the debug log (displayable onscreen by pressing
+# the ~ (tilde). The default log size is 200.
+#------------------------------------------------------------------------
+# LogSize 1000
+
+
 #------------------------------------------------------------------------
 # The LabelledStars section defines which stars will have text labels
 # assigned to them, which are visible when this option is turned on.

src/celengine/console.cpp

@@ -10,6 +10,7 @@
 #include <cstdarg>
 #include <cstdio>
 #include <cassert>
+#include <algorithm>
 #include "celutil/utf8.h"
 #include "gl.h"
 #include "vecgl.h"
@@ -52,6 +53,32 @@ Console::~Console()
 }
 
 
+/*! Resize the console log to use the specified number of rows.
+ *  Old long entries are preserved in the resize. setRowCount()
+ *  returns true if it was able to successfully allocate a new
+ *  buffer, and false if there was a problem (out of memory.)
+ */
+bool Console::setRowCount(int _nRows)
+{
+    wchar_t* newText = new wchar_t[(nColumns + 1) * _nRows];
+    if (newText == NULL)
+        return false;
+
+    for (int i = 0; i < _nRows; i++)
+    {
+        newText[(nColumns + 1) * i] = '\0';
+    }
+
+    std::copy(newText, newText + (nColumns + 1) * min(_nRows, nRows), text);
+
+    delete[] text;
+    text = newText;
+    nRows = _nRows;
+
+    return true;
+}
+
+
 void Console::begin()
 {
     glMatrixMode(GL_PROJECTION);

src/celengine/console.h

@@ -47,6 +47,8 @@ class Console : public std::ostream
     Console(int _nRows, int _nColumns);
     ~Console();
 
+    bool setRowCount(int _nRows);
+
     void begin();
     void end();
     void render(int rowHeight);

src/celestia/celestiacore.cpp

@@ -3969,6 +3969,10 @@ bool CelestiaCore::initSimulation(const string* configFileName,
         return false;
     }
 
+    // Set the console log size; ignore any request to use less than 100 lines
+    if (config->consoleLogRows > 100)
+        console.setRowCount(config->consoleLogRows);
+
 #ifdef USE_SPICE
     if (!InitializeSpice())
     {

src/celestia/configfile.cpp

@@ -131,6 +131,8 @@ CelestiaConfig* ReadCelestiaConfig(string filename, CelestiaConfig *config)
     config->shadowTextureSize = getUint(configParams, "ShadowTextureSize", 256);
     config->eclipseTextureSize = getUint(configParams, "EclipseTextureSize", 128);
 
+    config->consoleLogRows = getUint(configParams, "LogSize", 200);
+
     Value* solarSystemsVal = configParams->getValue("SolarSystemCatalogs");
     if (solarSystemsVal != NULL)
     {

src/celestia/configfile.h

@@ -63,6 +63,8 @@ public:
     unsigned int aaSamples;
 
     bool hdr;
+
+    unsigned int consoleLogRows;
     
     Hash* params;