On Linux, it works correctly: the drawings left and right are drawn with dashed lines. On Windows, the dash-pattern is ignored when the width is 2 or more.
#!/bin/bash # the next line restarts using wish \
exec /usr/bin/wish "$0" "$@"
#: WinDash.tcl - HaJo Gurt - 2005-07-13
#: Bug-Demo: On Windows, dash-patterns only work with width 1
#########1#########2#########3#########4#########5#########6#########7#####
package require Tk
grid [canvas .c -width 300 -height 325]
# dash-patterns: {2 4} {2 8} {6 4} {6 4 2 4} {6 4 2 4 2 4}
.c create oval 25 25 125 125 -width 1 -dash {2 4} -fill grey60
.c create oval 175 25 275 125 -width 2 -dash .
.c create line 20 150 130 150 -fill grey30 -width 1 -dash {6 4 2 4 2 4}
.c create line 170 150 280 150 -width 2 -dash {6 4 2 4}
for {set y 170} {$y<=180} {incr y} {
.c create line 20 $y 280 $y -fill grey30 -width 1 -dash {2 4 6 4} ;# -dash .-
}
.c create rect 25 200 125 300 -fill grey70 -width 1 -dash {6 4}
.c create rect 175 200 275 300 -width 2 -dash -The tcl-help text says "all values in the dash list will be multiplied by the line width before display. This assures that "." will always be displayed as a dot and "-" always as a dash regardless of the line width."
But on Windows, it looks like the dash-pattern is ignored when the width is 2 or more.