DONE:

- Removed usage of gdk_gl_font_use_pango_font() which is no longer in
  GtkGLExt Git.  Radiant now compiles on Linux From Scratch using current
  versions of software.
- As a side effect to the above, font inconsistency issues (like really
  large intermittent font in GL views) are gone.  Font looks better too.
- Changing algorithm for labeling grid view to be more robust.  Uses new
  functions gtk_glwidget_font_ascent() and gtk_glwidget_font_descent(),	and
  uses locally defined "cushion" variables.
- In xywindow.cpp, changing stepx and stepy based on 40 pixels, not 32.
  When coordinate numbers are very large the labels get too cluttered.
- Added	calls to gtk_gl_init() and gdk_gl_init() in main().  This is
  recommended according	to the GtkGLExt	reference manual.
- Tested all changes on	Ubuntu 10.10 and Debian	5.0 (Lenny).
TODO:
- In glDrawPixels(), instead of using a 32 bit pixel with
  GL_UNSIGNED_INT_8_8_8_8, see if we can use an 8 bit variant where each
  byte defines opacity and the GL current color is used.  In other words, try
  to use the FT_Bitmap directly without conversion.
- Examine every other use of gtk_glwidget_print_string() and
  gtk_glwidget_print_char() to make sure the positions are determined
  accurately.
NOT TODO:
- Decided not to use glBitmap() with display lists because it would
  disallow pretty antialiased fonts.


git-svn-id: svn://svn.icculus.org/gtkradiant/GtkRadiant/trunk@335 8a3a26a2-13c4-0310-b231-cf6edde360e5

radiant/xywindow.cpp

@@ -2232,9 +2232,9 @@ void XYWnd::XY_DrawGrid()
   while ((step * m_fScale) < 4.0f) // make sure major grid spacing is at least 4 pixels on the screen
     step *= 8;
   //Sys_Printf("step after: %i\n", step);
-  while ((stepx * m_fScale) < 32.0f) // text step x must be at least 32
+  while ((stepx * m_fScale) < 40.0f) // text step x must be at least 40 pixels
     stepx *= 2;
-  while ((stepy * m_fScale) < 32.0f) // text step y must be at least 32
+  while ((stepy * m_fScale) < 40.0f) // text step y must be at least 40 pixels
     stepy *= 2;
 
   qglDisable(GL_TEXTURE_2D);
@@ -2334,19 +2334,41 @@ void XYWnd::XY_DrawGrid()
   if ( g_qeglobals.d_savedinfo.show_coordinates)
   {
     qglColor3fv(g_qeglobals.d_savedinfo.colors[COLOR_GRIDTEXT]);
-		float offx = m_vOrigin[nDim2] + h - 6 / m_fScale, offy = m_vOrigin[nDim1] - w + 1 / m_fScale;
-		for (x=xb-((int)xb)%stepx; x<=xe ; x+=stepx)
-		{
-			qglRasterPos2f (x, offx);
-			sprintf (text, "%i",(int)x);
-			gtk_glwidget_print_string(text);
-		}
-		for (y=yb-((int)yb)%stepy; y<=ye ; y+=stepy)
-		{
-			qglRasterPos2f (offy, y);
-			sprintf (text, "%i",(int)y);
-			gtk_glwidget_print_string(text);
-		}
+
+    // Pixels between top of label for vertical grid line and top of grid view window.
+    // Note: There is currently a bug where the top few pixels of the grid view are hidden
+    // under the border.  So you should add about 5 to the desired value here.  However,
+    // the font ascent reaches higher than all digits, so you can subtract a few from the final
+    // number.
+    const int pixelsTopCushion = 4;
+
+    // Pixels between left of label and
+    //   - left of grid view window (for horizontal grid line label) or
+    //   - drawn vertical grid line (for vertical grid line label).
+    const int pixelsLeftCushion = 2; // IMPORTANT!  Must be at least 1 otherwise labels might not be drawn
+                                     // because the origin of the text might be off screen due to rounding.
+
+    // Pixels between baseline of horizontal grid line label and drawn horizontal grid line.
+    const int pixelsButtomCushion = 2;
+
+    float yPosLabelsTop = m_vOrigin[nDim2] + h - (gtk_glwidget_font_ascent() + pixelsTopCushion) / m_fScale;
+    float xPosLabelsLeft = m_vOrigin[nDim1] - w + pixelsLeftCushion / m_fScale;
+    float leftCushion = pixelsLeftCushion / m_fScale;
+    float bottomOffset = (pixelsButtomCushion - gtk_glwidget_font_descent()) / m_fScale;
+
+    // This renders the numbers along varying X on top of the grid view (labels vertical grid lines).
+    for (x = xb - ((int) xb) % stepx; x <= xe; x += stepx) {
+      qglRasterPos2f(x + leftCushion, yPosLabelsTop);
+      sprintf(text, "%i", (int) x);
+      gtk_glwidget_print_string(text);
+    }
+
+    // This renders the numbers along varying Y on the left of the grid view (labels horizontal grid lines).
+    for (y = yb - ((int) yb) % stepy; y <= ye; y += stepy) {
+      qglRasterPos2f(xPosLabelsLeft, y + bottomOffset);
+      sprintf(text, "%i", (int) y);
+      gtk_glwidget_print_string(text);
+    }
 
     if (Active())
       qglColor3fv(g_qeglobals.d_savedinfo.colors[COLOR_VIEWNAME]);