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- # 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;
-