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-A small Horse Race game, originally developed by Richard Suchenwirth -in plain Tcl (see http://wiki.tcl.tk/3467). The game was rewritten -as a design study in NX by Gustaf Neumann in May 2011.
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package require Tk -package require nx::trait - - ############################################################################## - # Trait ListUtils - # - # Some list utilities, not part of a package we can require here. - ############################################################################## - - nx::Trait create ::nx::trait::listUtils { - - :protected method lpick {list} { - # return a random entry from a given list - lindex $list [expr {int(rand()*[llength $list])}] - } - :protected method lremove {listName what} { - # remove a list element referenced by the elements value - :upvar $listName list - set pos [lsearch $list $what] - set list [lreplace $list $pos $pos] - } - } - - ############################################################################## - # Class Horse - # - # This class defines the logic, how and where a single horse and - # jockey are drawn. The painting of the horse happens just at startup - # time, later the horses are moved via their tags. - ############################################################################## - - nx::Class create Horse { - :property name:required ;# name is the external name of the horse - :property tag:required ;# tag is an internal id - :property canvas:required ;# the canvas, on which the horse is drawn - :property n:integer,required ;# the position on the canvas - - :require trait nx::trait::callback - :require trait nx::trait::listUtils - - :method draw {x y} { - set hide [:lpick {black brown white gray brown3 brown4}] - set c1 [:lpick {red yellow blue purple pink green}] - set c2 [:lpick {red yellow blue purple pink green}] - ${:canvas} create oval 0 -1 18 4 -fill $hide -outline $hide -tag ${:tag} - ${:canvas} create line 1 12 3 0 5 12 -fill $hide -tag ${:tag} -width 2 - ${:canvas} create line 15 12 17 0 19 12 -fill $hide -tag ${:tag} -width 2 - ${:canvas} create line 16 0 20 -7 24 -5 -fill $hide -tag ${:tag} -width 3 - # Jockey: - ${:canvas} create line 9 4 11 1 7 -1 -fill $c1 -width 2 -tag ${:tag} - ${:canvas} create line 7 -2 10 -6 15 -3 -fill $c2 -width 2 -tag ${:tag} - ${:canvas} create oval 9 -7 12 -10 -fill orange -outline orange -tag ${:tag} - ${:canvas} move ${:tag} $x $y - } - - :method init {} { - set w [entry ${:canvas}.e${:n} -textvar [:bindvar name] -width 7 -bg green3] - ${:canvas} create window 5 [expr {${:n}*30+5}] -window $w -anchor nw - :draw 70 [expr {${:n}*30+14}] - } - } - - ############################################################################## - # Class HorseGame - # - # Defines the main canvas of the Game and contains the logic of - # starting, resetting etc. - ############################################################################## - - nx::Class create HorseGame { - :property {bg1 green4} ;# background color of the canvas - :property {bg2 green3} ;# background color of the result label - :property {width 750} ;# width of the canvas - :property {height 330} ;# height of the canvas - :property {horses} ;# a list of horse names participating in the game - - :require trait nx::trait::callback - :require trait nx::trait::listUtils - - :method init {} { - # - # create the canvas - # - set :canvas [canvas .c -bg ${:bg1} -width ${:width} -height ${:height}] - pack ${:canvas} - # - # create the Horses - # - set n 0 - foreach name ${:horses} { - set h [::Horse create horse$n -name $name -canvas ${:canvas} -n $n -tag horse$n] - lappend :tags horse$n - incr n - } - - # finish line - set w [expr {${:width} - 20}] - ${:canvas} create line $w 0 $w ${:height} -fill white -tag finish - - # start button - button ${:canvas}.button -text Start -pady 0 -width 0 \ - -command [:callback start ${:tags}] - ${:canvas} create window 5 [expr {$n*30}] -window ${:canvas}.button -anchor nw - - # label for the results - label ${:canvas}.winners -textvar [:bindvar winners] -bg ${:bg2} -width 80 - ${:canvas} create window 70 [expr {$n*30}] -window ${:canvas}.winners -anchor nw - } - - :public method start {running} { - # - # When the "Start" button is pressed, we turn this button into a - # "Reset" button and the horse race starts. We stop, when more - # than two horses pass the finish line. - # - ${:canvas}.button config -text Reset -command [:callback reset] - set :winners {} - set finish [expr {[lindex [${:canvas} bbox finish] 2]+10}] - while {[llength ${:winners}]<3} { - set this [:lpick $running] - ${:canvas} move $this [:lpick {0 1 2 3}] 0 - update - if {[lindex [${:canvas} bbox $this] 2] > $finish} { - lappend :winners [expr {[llength ${:winners}]+1}]:[$this cget -name] - :lremove running $this - } - } - } - - :public method reset {} { - # - # When the "Reset" button is pressed, we switch back to the start - # configuration, the horses come back to the start. - # - ${:canvas}.button config -text Start -command [:callback start ${:tags}] - foreach tag ${:tags} { - set x [lindex [${:canvas} bbox $tag] 0] - ${:canvas} move $tag [expr {70-$x}] 0 - } - } - } - - # - # everything is defined, create the game - # - bind . <space> {exec wish $argv0 &; exit} - HorseGame new -horses {Blaise NX Animal Ada Alan XOTcl Grace itcl John Linus}