1. WTK for APWTCL
(WebTk for APWTCL) 1

2. History Start was about March 2012 Looking for a GUI for APWTCL
Use of WTK (WebTk from Mark Roseman) 2

3. The Idea First try with WTK in APWTCL Has a client server model
Server is administrating data for widgets
Client is displaying widget contents on screen
Communication either using socket interface or direct calls
Events go back from client to server for actions on administrative side 3

4. How the Current Version Started
After implementation of itclinjavascript reimplementation based of Jim Tcl (APWTCL)
Use of WTK for that version
Implement APWTCL based on javascript version in Java for Android smart phones
Implement APWTCL based on Java version in Objective-C for iPhone (iOS)
Need of a modified version of WTK 4

5. The Message Interface
Use of new message format and contents between client and server
Message format:
M<length of message>:<message>
Examples:
M53:9:wtkclient11:createLabel4:obj113:Hello Chicago
M33:9:wtkclient7:newGrid4:obj05:grid0
M38:9:wtkclient4:grid5:grid09:insertRow1:0
M48:9:wtkclient4:grid5:grid03:row1:010:insertCell1:0 5

6. The Client Side Decode and interpret message
M53:9:wtkclient11:createLabel4:obj113:Hello Chicago
After decoding:
{wtkclient createLabel obj1 {Hello Chicago}}
Convert to Command:
WtkclientCreateLabel obj1 {Hello Chicago}
WtkclientCreateLabel is the part doing the work
This part is calling native GUI element functions
Using introspection to call the function having the string of the function name 6

7. Different Approach for GUI
Missing functionality for Tk like widgets
Experiments with OpenGL ES
Use of screen buffer implementation
Use of primitives like
Lines
Triangles
polygons
Performance ok because of use of OpenGL ES for games
Give it a try 7

8. Use of OpenGL ES
OpenGL ES has graphics context as UI element on iPhone
Use of vertices for lines and triangles
Build Tk button with 2 triangles and border lines
Use of touch screen event with use of x and y coordinates
Gives possibility to recognize button events
Change of border line colors for relief effects
Idea of use of themed Tk functionality for implementation
Outstanding test of freetype fonts 8

9. Status‏ Server side part in Tcl for simple widgets partially done
Client side decoding of messages and dispatching partially done
Implemenation of GUI elements mostly missing
Themed Tk implementation not yet started
Freetype font and ftgles usage at the beginning of tests
General strategy seems doable 9

10. Todos‏ Implementation of themed Tk functionality
Interface to and use of freetype fonts and ftgles
Test suite
Prepare alpha version
Take care of feedback to that version
Documentation
Demos 10

11. Demo URL's‏
Sorry (almost) none, only a poor one 11