proc tracker_apply {id} {
# strip "." from the TK id to make a variable name suffix 
    set vid [string trimleft $id .]
# for each variable, make a local variable to hold its name...
    set var_graph_width [concat graph_width_$vid]
    global $var_graph_width
    set var_graph_height [concat graph_height_$vid]
    global $var_graph_height
    set var_saveflag [concat saveflag_$vid]
    global $var_saveflag
    set var_sym_send [concat sym_send_$vid]
    global $var_sym_send
    set var_sym_recv [concat sym_recv_$vid]
    global $var_sym_recv
 
    set cmd [concat $id resize \
        [eval concat $$var_graph_height] \
        [eval concat $$var_graph_width] \
        \;]
    pd $cmd

    set cmd [concat $id set_saveflag \
        [eval concat $$var_saveflag] \
        \;]
    pd $cmd

    set ss [string trim [set $var_sym_send]]
    if {$ss != {}} {pd [concat $id set_send $ss \;]}

    set rs [string trim [set $var_sym_recv]]
    if {$rs != {}} {pd [concat $id set_recv $rs \;]}
}
 
proc tracker_cancel {id} {
    set cmd [concat $id cancel \;]
    #puts stderr $cmd
    pd $cmd
}
 
proc tracker_ok {id} {
    tracker_apply $id
    tracker_cancel $id
}
 
proc pdtk_tracker_dialog {id width height saveflag digitw ss rs} {
    set vid [string trimleft $id .]
 
    set var_graph_width [concat graph_width_$vid]
    global $var_graph_width
    set var_graph_height [concat graph_height_$vid]
    global $var_graph_height
    set var_saveflag [concat saveflag_$vid]
    global $var_saveflag
    set var_sym_send [concat sym_send_$vid]
    global $var_sym_send
    set var_sym_recv [concat sym_recv_$vid]
    global $var_sym_recv

    set $var_graph_width $width
    set $var_graph_height $height
    set $var_saveflag $saveflag
    set $var_sym_recv $rs
    set $var_sym_send $ss
 
    toplevel $id
    wm title $id {tracker}
    wm protocol $id WM_DELETE_WINDOW [concat tracker_cancel $id]
 
    label $id.label -text {GRID PROPERTIES}
    pack $id.label -side top
 
    frame $id.buttonframe
    pack $id.buttonframe -side bottom -fill x -pady 2m
    button $id.buttonframe.cancel -text {Cancel}\
        -command "tracker_cancel $id"
    button $id.buttonframe.apply -text {Apply}\
        -command "tracker_apply $id"
    button $id.buttonframe.ok -text {OK}\
        -command "tracker_ok $id"
    pack $id.buttonframe.cancel -side left -expand 1
    pack $id.buttonframe.apply -side left -expand 1
    pack $id.buttonframe.ok -side left -expand 1
     
    frame $id.1rangef
    pack $id.1rangef -side top
    label $id.1rangef.lwidth -text "Width :"
    #entry $id.1rangef.width -textvar $var_graph_width -width 7
    spinbox $id.1rangef.width -textvariable $var_graph_width -width 7 -from 1 -to 99 -increment 1
    pack $id.1rangef.lwidth $id.1rangef.width -side left
 
    frame $id.2rangef
    pack $id.2rangef -side top
    label $id.2rangef.lheight -text "Height :"
    #entry $id.2rangef.height -textvar $var_graph_height -width 7
    spinbox $id.2rangef.height -textvariable $var_graph_height -width 7 -from 1 -to 99 -increment 1
    pack $id.2rangef.lheight $id.2rangef.height -side left

    frame $id.3rangef
    pack $id.3rangef -side top
    label $id.3rangef.lsaveflag -text ""
    checkbutton $id.3rangef.saveflag -variable $var_saveflag -text "save contents"
    pack $id.3rangef.lsaveflag $id.3rangef.saveflag -side left
 
    frame $id.4rangef
    pack $id.4rangef -side top
    label $id.4rangef.lwidth -text "Send symbol :"
    entry $id.4rangef.ss -textvar $var_sym_send -width 10
    pack $id.4rangef.lwidth $id.4rangef.ss -side left
 
    frame $id.5rangef
    pack $id.5rangef -side top
    label $id.5rangef.lwidth -text "Receive symbol :"
    entry $id.5rangef.rs -textvar $var_sym_recv -width 10
    pack $id.5rangef.lwidth $id.5rangef.rs -side left
 
    bind $id.1rangef.width <KeyPress-Return> [concat tracker_ok $id]
    bind $id.2rangef.height <KeyPress-Return> [concat tracker_ok $id]
    bind $id.4rangef.ss <KeyPress-Return> [concat tracker_ok $id]
    bind $id.5rangef.rs <KeyPress-Return> [concat tracker_ok $id]
    focus $id.1rangef.width
}