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# these simple samples have been developped by C. Mertz mertz@cena.fr in perl
# tcl version by Jean-Paul Imbert imbert@cena.fr
if {![info exists zincDemo]} {
error "This script should be run from the zinc-widget demo."
}
set w .fillrule
catch {destroy $w}
toplevel $w
wm title $w "Zinc Fillrule Demonstration"
wm iconname $w "Fillrule"
set defaultfont "-adobe-helvetica-bold-r-normal-*-120-*-*-*-*-*-*"
frame $w.buttons
pack $w.buttons -side bottom -fill x -pady 2m
button $w.buttons.dismiss -text Dismiss -command "destroy $w"
button $w.buttons.code -text "See Code" -command "showCode $w"
pack $w.buttons.dismiss $w.buttons.code -side left -expand 1
####### This file has been largely inspired from figure 11-3
####### of "The OpenGL Programming Guide 3rd Edition The
####### Official Guide to Learning OpenGL Version 1.2" ISBN 0201604582
####### it illustrates the use of :
####### -fillrule attribute of curves
####### contour coords and clone method
zinc $w.zinc -width 550 -height 630 -font 10x20 -borderwidth 0 -backcolor white
pack $w.zinc
$w.zinc add text 1 -position {20 8} -text {This still static example reproduces figure 11-3
of "The OpenGL Programming Guide 3rd Edition" V 1.2}
set group [$w.zinc add group 1]
set g1 [$w.zinc add group $group]
set curve1 [$w.zinc add curve $g1 {}]
$w.zinc contour $curve1 add +1 { 0 0 0 120 120 120 120 0 0 0}
$w.zinc contour $curve1 add +1 { 20 20 20 100 100 100 100 20 20 20}
$w.zinc contour $curve1 add +1 { 40 40 40 80 80 80 80 40 40 40}
$w.zinc translate $g1 40 40
set g2 [$w.zinc add group $group]
set curve2 [$w.zinc add curve $g2 {}]
$w.zinc contour $curve2 add +1 { 0 0 0 120 120 120 120 0 0 0}
$w.zinc contour $curve2 add -1 { 20 20 20 100 100 100 100 20 20 20}
$w.zinc contour $curve2 add -1 { 40 40 40 80 80 80 80 40 40 40}
$w.zinc translate $g2 200 40
set g3 [$w.zinc add group $group]
set curve3 [$w.zinc add curve $g3 {}]
$w.zinc contour $curve3 add +1 { 20 0 20 120 100 120 100 0 20 0}
$w.zinc contour $curve3 add +1 { 40 20 60 120 80 20 40 20}
$w.zinc contour $curve3 add +1 { 0 60 0 80 120 80 120 60 0 60}
$w.zinc translate $g3 360 40
set g4 [$w.zinc add group $group]
set curve4 [$w.zinc add curve $g4 {}]
$w.zinc contour $curve4 add +1 { 0 0 0 140 140 140 140 60 60 60 60 80 80 80 80 40 40 40 40 100 100 100 100 20 20 20 20 120 120 120 120 0 0 0}
$w.zinc translate $g4 520 40
$w.zinc scale $group 0.6 0.6
$w.zinc translate $group 80 20
$w.zinc add text $group -position {-110 40} -text "contours\nand\nwinding\nnumbers"
$w.zinc add text $group -position {-110 170} -text "winding\nrules"
set dy 0
foreach fillrule {odd nonzero positive negative abs_geq_2} {
set dy [expr $dy + 160]
$w.zinc add text $group -position "-110 [expr 100+$dy]" -text $fillrule
foreach item "$curve1 $curve2 $curve3 $curve4" {
set clone [$w.zinc clone $item -fillrule $fillrule -filled 1]
$w.zinc translate $clone 0 $dy
}
}
# creating simple lines with arrows under each curves
foreach item "$curve1 $curve2 $curve3 $curve4" {
set contour_number [$w.zinc contour $item]
#puts "$item contour_number=$contour_number\n"
for {set n 0} {$n <=[expr $contour_number-1]} {incr n} {
set points [$w.zinc coords $item $n]
set nbpoints [llength $points]
for {set i 0} {$i <=[expr $nbpoints-2]} {incr i} {
set firstpoint [lindex $points $i]
set lastpoint [lindex $points [expr $i+1]]
set middlepoint "[expr [lindex $firstpoint 0]+([lindex $lastpoint 0]- [lindex $firstpoint 0])/1.5] [expr [lindex $firstpoint 1]+([lindex $lastpoint 1]-[lindex $firstpoint 1])/1.5]"
$w.zinc add curve [$w.zinc group $item] "$firstpoint $middlepoint" -lastend "7 10 4"
}
}
}
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