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# hscale.pl
use subs qw /hscale_width/;
use vars qw/$TOP/;
sub hscale {
# Create a top-level window that displays a horizontal scale.
my($demo) = @_;
$TOP = $MW->WidgetDemo(
-name => $demo,
-text => 'An arrow and a horizontal scale are displayed below. If you click or drag mouse button 1 in the scale, you can change the size of the arrow.',
-title => 'Horizontal Scale Demonstration',
-iconname => 'hscale',
);
my $frame = $TOP->Frame(-borderwidth => 10)->pack(qw/-side top -fill x/);
my $canvas = $frame->Canvas(
qw/width 50 -height 50 -bd 0 -highlightthickness 0/);
$canvas->createPolygon(qw/0 0 1 1 2 2 -fill DeepSkyBlue3 -tags poly/);
$canvas->createLine (qw/0 0 1 1 2 2 0 0 -fill black -tags line/);
my $scale = $frame->Scale(qw/-orient horizontal -length 284 -from 0
-to 250 -tickinterval 50 -command/ => [\&hscale_width, $canvas]);
$scale->set(75);
$canvas->pack(qw/-side top -expand yes -anchor w -fill x/);
$scale->pack(qw/-side bottom -expand yes -anchor w/);
} # end hscale
sub hscale_width {
my($w, $width) = @_;
$width += 21;
my $x2 = $width - 30;
$x2 = 21 if $x2 < 21;
$w->coords('poly', 20, 15, 20, 35, $x2, 35, $x2, 45, $width, 25, $x2, 5,
$x2, 15, 20, 15);
$w->coords('line', 20, 15, 20, 35, $x2, 35, $x2, 45, $width, 25, $x2, 5,
$x2, 15, 20, 15);
} # end hscale_width
1;
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