Beefy Boxes and Bandwidth Generously Provided by pair Networks
Problems? Is your data what you think it is?
 
PerlMonks  

Tk Rubberband Demo

by crazyinsomniac (Prior)
on Jun 22, 2002 at 10:45 UTC ( #176475=perlcraft: print w/ replies, xml ) Need Help??

   1: #!/usr/bin/perl -w
   2: # rubberband.pl
   3: # a little rubberbanding Tk demo (demonstrates rubberbanding with perl Tk)
   4: # copyright crazyinsomniac.perlmonk.org 2002, all rights reserved
   5: # released under the same terms as perl itself
   6: use strict;
   7: 
   8: use Tk 8;
   9: 
  10: my $MW = new MainWindow(
  11:         -background => 'darkblue',
  12:         -borderwidth => 1,
  13:         -relief => 'groove',
  14:         -width => 500,
  15:         -height => 500,
  16:     ,);
  17: 
  18: my $F = $MW->Frame(
  19:     -relief  => "groove",
  20:     -height => 300,
  21:     -width => 500,
  22: ,)->pack(
  23:     -anchor => 'n',
  24:     -side => 'top',
  25:     -expand => 'yes',
  26: ,);
  27: 
  28: use vars '$OBJECT'; BEGIN{$OBJECT="oval"};
  29: 
  30: Button($F, "oval", groove => sub { $OBJECT = "oval" } );
  31: Button($F, "line", groove => sub { $OBJECT = "line" } );
  32: Button($F, "arc", groove => sub { $OBJECT = "arc" } );
  33: Button($F, "rectangle", groove => sub { $OBJECT = "rectangle" } );
  34: 
  35: 
  36: $F->Label(
  37:     -text => " OBJECT:",
  38:     -relief => 'flat',
  39:     -font => "Arial",
  40: ,)->pack(
  41:     -side => 'left',
  42:     -expand => 1,
  43: ,);
  44: 
  45: $F->Label(
  46:     -textvariable => \$OBJECT,
  47:     -relief => 'flat',
  48:     -font => "Arial",
  49: ,)->pack(
  50:     -side => 'left',
  51:     -expand => 1,
  52: ,);
  53: 
  54: my $C = $MW->Canvas(
  55:         -width      => 500,
  56:         -height     => 500,
  57:         -background => "#AFFAAF",
  58:     ,)->pack;
  59: 
  60: ## S&M (left button down only)
  61: $MW->bind(
  62:     'Tk::Canvas',
  63:     '<ButtonPress-1>' => [\&BandOn, map{Ev($_)} qw{ x y s } ]
  64: );
  65: 
  66: $MW->bind(
  67:     'Tk::Canvas',
  68:     '<ButtonRelease-1>' => [\&BandOff, map{Ev($_)} qw{ x y s } ]
  69: );
  70: 
  71: 
  72: &MainLoop();
  73: 
  74: sub BandOn {
  75:     BEEP("BandOn",@_);
  76:     
  77:     my( $C, $X, $Y, $S ) = @_;
  78:     $C->{"\0__Xo"} = $X; # the origin, to remain constant
  79:     $C->{"\0__Yo"} = $Y;
  80:     $C->{"\0__RUBBER"} = "RUBBER".time;
  81:     $C->create($OBJECT, $X, $Y, $X+10, $Y+10, -tags => $C->{"\0__RUBBER"});
  82: 
  83:     $MW->bind(
  84:         'Tk::Canvas',
  85:         '<Motion>' => [\&BandIt, map { Ev($_) } qw{ x y s } ]
  86:     );
  87: }
  88: 
  89: 
  90: sub BandOff {
  91:     BEEP("BandOff",@_);
  92:     my( $C, $X, $Y, $S ) = @_;
  93:     
  94:     $MW->bind(
  95:         'Tk::Canvas',
  96:         '<Motion>' => undef, # essentially unbind
  97:     );   
  98: }
  99: 
 100: sub BandIt {
 101:     BEEP("BandIt",@_);
 102:     my( $C, $X, $Y, $S ) = @_;
 103: 
 104:     $C->delete($C->{"\0__RUBBER"}); # I wish I could transform the existing one
 105:     $C->create(
 106:         $OBJECT,
 107:         $C->{"\0__Xo"},
 108:         $C->{"\0__Yo"},
 109:         $X, $Y, -tags => $C->{"\0__RUBBER"},
 110:     );
 111: 
 112: }
 113: 
 114: 
 115: sub BEEP {
 116:    print shift(@_),"\n";
 117:    print shift(@_)->{"\0__RUBBER"},"\n";
 118:    print "$_)$_[$_]\n" for 0..$#_;
 119: }
 120: 
 121: 
 122: 
 123: 
 124: sub Button {
 125:     my ( $W , $text , $relief , $sub )=@_;
 126: 
 127:     $W = $W->Button(
 128:         -text => $text,
 129:         -relief => $relief,
 130:     ,)->pack(
 131:         -anchor => 'n',
 132:         -expand => 'no',
 133:         -side => 'left',
 134:     ,);
 135: 
 136:     $W->configure(-command => [ $sub, $W ] );
 137: 
 138:     return undef;
 139: }
 140: 

Comment on Tk Rubberband Demo
Download Code

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: perlcraft [id://176475]
Approved by Albannach
Front-paged by cjf
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others pondering the Monastery: (8)
As of 2014-07-23 05:11 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    My favorite superfluous repetitious redundant duplicative phrase is:









    Results (133 votes), past polls