Viewing file:  vscale.pl (1.38 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
# vscale.pl
use subs qw/vscale_height/;
use vars qw/$TOP/;
sub vscale {
# Create a top-level window that displays a vertical scale.
my($demo) = @_;
$TOP = $MW->WidgetDemo(
-name => $demo,
-text => 'An arrow and a vertical scale are displayed below. If you click or drag mouse button 1 in the scale, you can change the size of the arrow.',
-title => 'Vertical Scale Demonstration',
-iconname => 'vscale',
);
my $frame = $TOP->Frame(-borderwidth => 10)->pack;
my $canvas = $frame->Canvas(
qw/-width 50 -height 50 -borderwidth 0 -highlightthickness 0/);
$canvas->createPolygon(qw/0 0 1 1 2 2 -fill SeaGreen3 -tags poly/);
$canvas->createLine(qw/0 0 1 1 2 2 0 0 -fill black -tags line/);
my $scale = $frame->Scale(qw/-orient vertical -length 284 -from 0
-to 250 -tickinterval 50 -command/ => [\&vscale_height, $canvas]);
$scale->set(75);
$scale->pack(qw/-side left -anchor ne/);
$canvas->pack(qw/-side left -anchor nw -fill y/)
} # end vscale
sub vscale_height {
my($w, $height) = @_;
$height += 21;
my $y2 = $height - 30;
$y2 = 21 if $y2 < 21;
$w->coords('poly', 15, 20, 35, 20, 35, $y2, 45, $y2, 25, $height, 5, $y2,
15, $y2, 15, 20);
$w->coords('line', 15, 20, 35, 20, 35, $y2, 45, $y2, 25, $height, 5, $y2,
15, $y2, 15, 20);
} # end vscale_height
1;
|