Adding to description file

CLAUDE.md

@@ -3,6 +3,31 @@ days of digital electronics and we had to use a cathode ray tube with p7 phospho
 
 I plan to use c++ and opengl and shaders for access to a GPU. I am in ubuntu 25.10.
 
+I wish the c++ be arranged as follows:
+
+All code in the src subdirectory 
+
+The main program and the binary would be called radar-simulation.
+
+We need to use classes. For now, I can see one class for all things
+having to do with putting stuff on the screen. Includes initializing
+OpenGL and put up two windows on the screen. One is for the PPI display,
+locate on the right hand side of the screen with margins for the sides of
+the monitor. The A Scope is a smaller window on the center of the left
+side of the display.
+
+All inputs to either display will be performed in that class. Data fields
+for the methods of that class should be put into a header file in the
+headers directory.
+
+Another class would be used to communicate with the raspberry pies that
+will obtain data from the ais and ads-b software defined radios. 
+
+Another class would be used for simulating targets, like for example
+a sailboat regatta race.
+
+There may be more classes TBD
+
 The platform is a Geekom GEEKOM A8 Max, AMD Ryzen 9 8945HS 5.2GHz 32GB RAM
 
 Now here is the overall project and proposed architecture
@@ -19,5 +44,24 @@ how to impliment the bearing control. Just put the display up on the screen.
 The main ppi scope will take up the right hand side of the screen. You need to leave about
 a 1/2 inch margin around the sides of the circular scope. 
 
+Details for A scope (predescor to the PPI scope)
+
 The a scope will have pulse amplitude on the vertical axis and the range on the horizontal
-axis. There will be a graticule for the a scope. 
+axis. There will be a graticule for the a scope. This will show range markings. In the
+day, the operator would physically change the graticule overlay. What we can do is to 
+electronically change the overlay  and put a brief message saying operator changes
+the graticule. 
+
+The graticle was illuminated with #47 incandescent dial lights, we need to have that
+graticule lit with an equivalent color. Horizontal is range, verticle is strength
+of the return blip. The phosphor of the A scope is green, similar to P1, which was
+used on oscillosopes. 
+
+Please note that there will be two sets of shaders. Once for the actual trace and the
+other is used for the graticule. It will be used to change the graticle range and 
+briefly display the message "operator inserts new graticule manually". If possible for
+realism, have the old graticule move up and off the screen and then the new graticule move
+onto and down the screen until it is in place, simulating the operator changing the
+graticule. 
+
+PPI display will be done later.