[Gzz-commits] libvob/doc/pegboard/vobscene_recursion--tjl peg...

[Tuomas J. Lukka]

CVSROOT:        /cvsroot/libvob
Module name:    libvob
Branch:         
Changes by:     Tuomas J. Lukka <address@hidden>        03/08/06 12:27:43

Modified files:
        doc/pegboard/vobscene_recursion--tjl: peg.rst 

Log message:
        Thinking about recursion still

CVSWeb URLs:
http://savannah.gnu.org/cgi-bin/viewcvs/libvob/libvob/doc/pegboard/vobscene_recursion--tjl/peg.rst.diff?tr1=1.6&tr2=1.7&r1=text&r2=text

Patches:
Index: libvob/doc/pegboard/vobscene_recursion--tjl/peg.rst
diff -u libvob/doc/pegboard/vobscene_recursion--tjl/peg.rst:1.6 
libvob/doc/pegboard/vobscene_recursion--tjl/peg.rst:1.7
--- libvob/doc/pegboard/vobscene_recursion--tjl/peg.rst:1.6     Tue Aug  5 
08:04:33 2003
+++ libvob/doc/pegboard/vobscene_recursion--tjl/peg.rst Wed Aug  6 12:27:43 2003
@@ -3,8 +3,8 @@
 =============================================================
 
 :Author:   Tuomas J. Lukka
-:Last-Modified: $Date: 2003/08/05 12:04:33 $
-:Revision: $Revision: 1.6 $
+:Last-Modified: $Date: 2003/08/06 16:27:43 $
+:Revision: $Revision: 1.7 $
 :Status:   Current
 
 Performance problems in PP show that we should soon make a big
@@ -40,12 +40,12 @@
     life a bit more difficult internally (can't just copy a list) but
     should be well worth it e.g. for FenPDF.
 
-- How do we map between coordinate systems?
+- How do we map between coordinate systems of the parent and child vobscenes?
 
     RESOLVED: By explicitly creating a coordinate system in the parent
     corresponding to a coordinate system in the child by a special method.
 
-- Modifications to child vobscenes?
+- Are modifications to child vobscenes allowed?
 
     RESOLVED: Using a vobscene after a child that was placed into it
     has been altered in any way **except** coordinate system parameter
@@ -71,6 +71,9 @@
     the initial coordinate systems will be numbered -- an extra parameter
     to createVobScene (reserveCS).
 
+    It is recommended that a class with constants is created to
+    number the initial coordinate systems, for ease of access.
+
 - Should the child vobscene define the number of coordsys 
   in the beginning to replace with coordsys from the parent?
 
@@ -113,7 +116,8 @@
 - Is a normal VobScene usable as a child vobscene? Or do we need special
   operations?
 
-    RESOLVED: No. Too much overhead and difficulties. The correct way
+    RESOLVED: No, it should not be usable. Too much overhead and difficulties. 
+    The correct way
     is to create a VobScene by the 
     ``GraphicsAPI.RenderingSurface.createChildVobScene(int reserveCS)``
     call.  
@@ -164,5 +168,17 @@
 
 The unit box of CS 1 is set to screen size, while the unit box
 of CS 0 is (1,1).
+
+OpenGL implementation
+---------------------
+
+In OpenGL, the recursion is implemented by a special coordinate system type
+and a special Vob. 
+
+The special coordinate system type causes the Coorder to call a method
+to get the child coorder through an interface given to it, giving itself
+as the parent parameter.
+
+