Semester Project (part 4)

Window management

• Will use X Window System through local server for display
• Will use xterm window for input
• Library robowindow.o contains code for window management

Window functions

• Open new window
• Display current status
• Window events (redraw)

Library functions

• Display *init_window(argc, argv, wscale) : opens and initializes the display window, with (float) wscale scaling factor and returns a pointer to the X display in use.
• process_event() : handles X events related to the display window.
• update_player(id, name) : adds a new player id to name mapping for the display labeling function.
• update_window(nobj, status) : redraws the display window according to the new status (received from the Robowar server).

init_window

• Accepts arguments from command line for X display initialization
  • Client should remove any client-specific parameters
  • Pass remainder to init_window
  • E.g., -display
• Returns pointer to Display type:

  #include <X11/Xlib.h>
  
  Display *dpy;
  
  dpy = init_window(argc, argv, wscale);
  

process_event

• Processes window events
• Called if XPending is true

  while (XPending(dpy))
      process_event();
  

• XPending is in X library

update_player

• Process change (add or delete) to current list of players
• update_player manages list of players; your client just passes in changes
• Bit 31 0f ID == 1 => player left game

update_window

• Accepts status message as input
• Extracts locations of objects and draws icons

Linking window library to your client

• Must link robowindow.o, math and X libraries
• Use:

  gcc ${CFLAGS} -o player player.o \
      /home/brian/cse342/bin/robowindow-solaris10-x86.o -lX11 -lm -L/usr/openwin/lib
  

  (Other versions of robowindow.o are available for different platforms.)