Initial class construction

Git/mingw64/lib/tk8.6/demos/vscale.tcl

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+# vscale.tcl --
+#
+# This demonstration script shows an example with a vertical scale.
+
+if {![info exists widgetDemo]} {
+    error "This script should be run from the \"widget\" demo."
+}
+
+package require Tk
+
+set w .vscale
+catch {destroy $w}
+toplevel $w
+wm title $w "Vertical Scale Demonstration"
+wm iconname $w "vscale"
+positionWindow $w
+
+label $w.msg -font $font -wraplength 3.5i -justify left -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."
+pack $w.msg -side top -padx .5c
+
+## See Code / Dismiss buttons
+set btns [addSeeDismiss $w.buttons $w]
+pack $btns -side bottom -fill x
+
+frame $w.frame -borderwidth 10
+pack $w.frame
+
+scale $w.frame.scale -orient vertical -length 284 -from 0 -to 250 \
+	-command "setHeight $w.frame.canvas" -tickinterval 50
+canvas $w.frame.canvas -width 50 -height 50 -bd 0 -highlightthickness 0
+$w.frame.canvas create polygon 0 0 1 1 2 2 -fill SeaGreen3 -tags poly
+$w.frame.canvas create line 0 0 1 1 2 2 0 0 -fill black -tags line
+frame $w.frame.right -borderwidth 15
+pack $w.frame.scale -side left -anchor ne
+pack $w.frame.canvas -side left -anchor nw -fill y
+$w.frame.scale set 75
+
+proc setHeight {w height} {
+    incr height 21
+    set y2 [expr {$height - 30}]
+    if {$y2 < 21} {
+	set 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
+}