| 1 | |
| 2 | |
| 3 | sub mkVScale { |
| 4 | |
| 5 | # Create a top-level window that displays a vertical scale. |
| 6 | |
| 7 | $mkVScale->destroy if Exists($mkVScale); |
| 8 | $mkVScale = $top->Toplevel(); |
| 9 | my $w = $mkVScale; |
| 10 | dpos $w; |
| 11 | $w->title('Vertical Scale Demonstration'); |
| 12 | $w->iconname('Scale'); |
| 13 | my $w_msg = $w->Label(-font => '-Adobe-times-medium-r-normal--*-180*-*-*-*-*-*-*', -wraplength => '4i', |
| 14 | -justify => 'left', -text => 'An arrow and a vertical scale are displayed below. If you click ' . |
| 15 | 'or drag mouse button 1 in the scale, you can change the height of the arrow. Click the "OK" ' . |
| 16 | 'button when you\'re finished.'); |
| 17 | my $w_frame = $w->Frame(-borderwidth => 10); |
| 18 | my $w_ok = $w->Button(-text => 'OK', -width => 8, -command => ['destroy', $w]); |
| 19 | $w_msg->pack(); |
| 20 | $w_frame->pack(); |
| 21 | $w_ok->pack(); |
| 22 | |
| 23 | my $w_frame_canvas = $w_frame->Canvas(qw(-width 50 -height 50 -bd 0 -highlightthickness 0)); |
| 24 | $w_frame_canvas->create(qw(polygon 0 0 1 1 2 2 -fill SeaGreen3 -tags poly)); |
| 25 | $w_frame_canvas->create(qw(line 0 0 1 1 2 2 0 0 -fill black -tags line)); |
| 26 | my $w_frame_scale = $w_frame->Scale(-orient => 'vertical', '-length' => 284, -from => 0, -to => 250, -tickinterval => 50, |
| 27 | -command => [\&setHeight, $w_frame_canvas]); |
| 28 | $w_frame_scale->pack(-side => 'left', -anchor => 'ne'); |
| 29 | $w_frame_canvas->pack(-side => 'left', -anchor => 'nw', -fill => 'y'); |
| 30 | $w_frame_scale->set(75); |
| 31 | |
| 32 | } # end mkVScale |
| 33 | |
| 34 | |
| 35 | sub setHeight { |
| 36 | |
| 37 | my($w, $height) = @_; |
| 38 | |
| 39 | $height += 21; |
| 40 | $y2 = $height - 30; |
| 41 | $y2 = 21 if $y2 < 21; |
| 42 | $w->coords('poly', 15, 20, 35, 20, 35, $y2, 45, $y2, 25, $height, 5, $y2, 15, $y2, 15, 20); |
| 43 | $w->coords('line', 15, 20, 35, 20, 35, $y2, 45, $y2, 25, $height, 5, $y2, 15, $y2, 15, 20); |
| 44 | |
| 45 | } # end setHeight |
| 46 | |
| 47 | |
| 48 | 1; |