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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 .curve_bezier
catch {destroy $w}
toplevel $w
wm title $w "Zinc Curve Bezier Demonstration"
wm iconname $w Curve
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
text $w.text -relief sunken -borderwidth 2 -setgrid true -height 3
pack $w.text -expand yes -fill both
$w.text insert 0.0 {
6 examples of curves containing control points are displayed
with the list of control points written just below.
You can move the handles to modify the bezier curves
}
zinc $w.zinc -width 700 -height 650 -font 9x15 -borderwidth 0 -backcolor white
pack $w.zinc
set group [$w.zinc add group 1]
$w.zinc add text $group -position {50 20} -anchor w -text "Examples of curve items using cubic bezier control points" -color grey20
## Please note: much of the following items below could be computed
$w.zinc add curve $group {100 200 100 100} -tags {line1 l1-2} -linecolor \#888888 -filled 0 -linewidth 2
$w.zinc add curve $group {400 100 400 200} -tags {line1 l3-4} -linecolor \#888888 -filled 0 -linewidth 2
$w.zinc add curve $group {{100 200} {100 100 c} {400 100 c} {400 200}} -tags {bezier1} -closed 0 -linecolor red -linewidth 5
$w.zinc add arc $group {90 190 110 210} -tags {handle1 p1} -filled 1 -fillcolor \#BBBBBB
$w.zinc add arc $group {90 90 110 110} -tags {handle1 p2} -filled 1 -linewidth 0 -fillcolor grey80 -filled 1
$w.zinc add arc $group {390 90 410 110} -tags {handle1 p3} -filled 1 -linewidth 0 -fillcolor grey80 -filled 1
$w.zinc add arc $group {390 190 410 210} -tags {handle1 p4} -filled 1 -fillcolor \#BBBBBB
$w.zinc add curve $group {600 200 675 100} -tags {line2 l1-2} -linecolor \#888888 -linewidth 2
$w.zinc add curve $group {975 100 900 200} -tags {line2 l3-4} -linecolor \#888888 -linewidth 2
$w.zinc add curve $group {{600 200} {675 100 c} {975 100 c} {900 200}} -tags {bezier2} -closed 0 -linecolor red -linewidth 5
$w.zinc add arc $group {590 190 610 210} -tags {handle2 p1} -filled 1 -linecolor grey80 -linewidth 2
$w.zinc add arc $group {665 90 685 110} -tags {handle2 p2} -filled 1 -linewidth 0 -fillcolor grey80
$w.zinc add arc $group {965 90 985 110} -tags {handle2 p3} -filled 1 -linewidth 0 -fillcolor grey80
$w.zinc add arc $group {890 190 910 210} -tags {handle2 p4} -filled 1 -linecolor grey80 -linewidth 2
$w.zinc add curve $group {100 500 25 400} -tags {line3 l1-2} -linecolor \#888888 -linewidth 2
$w.zinc add curve $group {475 400 400 500} -tags {line3 l3-4} -linecolor \#888888 -linewidth 2
$w.zinc add curve $group {{100 500} {25 400 c} {475 400 c} {400 500}} -tags {bezier3} -closed 0 -linecolor red -linewidth 5
$w.zinc add arc $group {90 490 110 510} -tags {handle3 p1} -filled 1 -linecolor grey80 -linewidth 2
$w.zinc add arc $group {15 390 35 410} -tags {handle3 p2} -filled 1 -linewidth 0 -fillcolor grey80
$w.zinc add arc $group {465 390 485 410} -tags {handle3 p3} -filled 1 -linewidth 0 -fillcolor grey80
$w.zinc add arc $group {390 490 410 510} -tags {handle3 p4} -filled 1 -linecolor grey80 -linewidth 2
#$w.zinc add "text" $group -position {570 570} -anchor w -tags {"bezier4"} -color "grey20"
$w.zinc add curve $group {600 500 600 350} -tags {line4 l1-2} -linecolor \#888888 -linewidth 2
$w.zinc add curve $group {900 650 900 500} -tags {line4 l3-4} -linecolor \#888888 -linewidth 2
$w.zinc add curve $group {{600 500} {600 350 c} {900 650 c} {900 500}} -tags {bezier4} -closed 0 -linecolor red -linewidth 5
$w.zinc add arc $group {590 490 610 510} -tags {handle4 p1} -filled 1 -linecolor grey80 -linewidth 2
$w.zinc add arc $group {590 340 610 360} -tags {handle4 p2} -filled 1 -linewidth 0 -fillcolor grey80
$w.zinc add arc $group {890 640 910 660} -tags {handle4 p3} -filled 1 -linewidth 0 -fillcolor grey80
$w.zinc add arc $group {890 490 910 510} -tags {handle4 p4} -filled 1 -linecolor grey80 -linewidth 2
$w.zinc add curve $group {100 800 175 700} -tags {line5 l1-2} -linecolor \#888888 -filled 0 -linewidth 2
$w.zinc add curve $group {325 700 400 800} -tags {line5 l3-4} -linecolor \#888888 -filled 0 -linewidth 2
$w.zinc add curve $group {{100 800} {175 700 c} {325 700 c} {400 800}} -tags {bezier5} -closed 0 -linecolor red -linewidth 5
$w.zinc add arc $group {90 790 110 810} -tags {handle5 p1} -filled 1 -linecolor grey80 -linewidth 2
$w.zinc add arc $group {165 690 185 710} -tags {handle5 p2} -filled 1 -linewidth 0 -fillcolor grey80 -filled 1
$w.zinc add arc $group {315 690 335 710} -tags {handle5 p3} -filled 1 -linewidth 0 -fillcolor grey80 -filled 1
$w.zinc add arc $group {390 790 410 810} -tags {handle5 p4} -filled 1 -linecolor grey80 -linewidth 2
$w.zinc add curve $group {600 800 625 700} -tags {line6 l1-2} -linecolor \#888888 -linewidth 2
$w.zinc add curve $group {725 700 750 800} -tags {line6 l3-4} -linecolor \#888888 -linewidth 2
$w.zinc add curve $group {750 800 775 900} -tags {line6 l4-5} -linecolor \#888888 -linewidth 2
$w.zinc add curve $group {875 900 900 800} -tags {line6 l6-7} -linecolor \#888888 -linewidth 2
$w.zinc add curve $group {{600 800} {625 700 c} {725 700 c} {750 800} {775 900 c} {875 900 c} {900 800}} -tags {bezier6} -filled 0 -closed 0 -linecolor red -linewidth 5
$w.zinc add arc $group {590 790 610 810} -tags {handle6 p1} -filled 1 -linecolor grey80 -linewidth 2
$w.zinc add arc $group {615 690 635 710} -tags {handle6 p2} -filled 1 -linewidth 0 -fillcolor grey80
$w.zinc add arc $group {715 690 735 710} -tags {handle6 p3} -filled 1 -linewidth 0 -fillcolor grey80
$w.zinc add arc $group {740 790 760 810} -tags {handle6 p4} -filled 1 -linecolor blue -fillcolor blue -linewidth 2
$w.zinc add arc $group {766 891 784 909} -tags {handle6 p5} -filled 1 -linecolor grey80 -linewidth 4
$w.zinc add arc $group {865 890 885 910} -tags {handle6 p6} -filled 1 -linewidth 0 -fillcolor grey80
$w.zinc add arc $group {890 790 910 810} -tags {handle6 p7} -filled 1 -linecolor grey80 -linewidth 2
$w.zinc add text $group -position {25 980} -anchor w -tags coords -color grey20
$w.zinc scale $group 0.6 0.6
## Set the text of the text item with a tag "tag"
## to a human-readable form of the coords of the
## corresponding curve with the same tag "tag"
proc setText {tag} {
global w
set textItem [$w.zinc find withtype text coords]
set curveItem [$w.zinc find withtype curve $tag]
set coords [$w.zinc coords $curveItem]
set count 0
$w.zinc itemconfigure $textItem -text $coords
}
foreach bezierCount {1 2 3 4 5 6} {
set setText "bezier$bezierCount"
set curveItem [$w.zinc find withtype curve "bezier$bezierCount"]
set coords [$w.zinc coords $curveItem]
#puts "$bezierCount : $curveItem : $coords"
$w.zinc bind "handle$bezierCount" <1> {itemStartDrag %x %y}
$w.zinc bind "handle$bezierCount" <B1-Motion> {itemDrag %x %y}
#$w.zinc bind "handle$bezierCount" "<ButtonPress-1>" {\&press \&motion}
#$w.zinc bind "handle$bezierCount" "<ButtonRelease-1>" {\&release}
}
##### bindings for moving the handles
set item ""
set bezierNum ""
set ptNum ""
set x_orig ""
set y_orig ""
proc itemStartDrag {x y} {
global w
global x_orig y_orig
global bezierNum ptNum
global item
set x_orig $x
set y_orig $y
set item [$w.zinc find withtag current]
foreach val [$w.zinc gettags $item] {
regexp {([a-z]+)(\d)} $val "" name num
if {$name=="handle"} {set bezierNum $num}
if {$name=="p"} {set ptNum $num}
}
#puts "bezierNum=$bezierNum ptNum=$ptNum"
}
# Callback for moving an item
proc itemDrag {x y} {
global x_orig y_orig
global w
global item
$w.zinc transform $item "[expr $x-$x_orig] [expr $y-$y_orig]"
moveHandle [expr $x-$x_orig] [expr $y-$y_orig]
set x_orig $x;
set y_orig $y;
}
proc moveHandle {dx dy} {
global w
global bezierNum
global ptNum
global item
set pt1 [lindex [$w.zinc coords $item] 0]
set pt2 [lindex [$w.zinc coords $item] 1]
## modifying the handle coords
$w.zinc coords $item "[expr [lindex $pt1 0]+$dx] [expr [lindex $pt1 1]+$dy] [expr [lindex $pt2 0]+$dx] [expr [lindex $pt2 1]+$dy]"
set prevPtNum [expr $ptNum-1]
# there should only be one such item!
set lineA [$w.zinc find withtag "line$bezierNum && l$prevPtNum-$ptNum"]
if {$lineA!=""} {
set x [lindex [$w.zinc coords $lineA 0 1] 0]
set y [lindex [$w.zinc coords $lineA 0 1] 1]
$w.zinc coords $lineA 0 1 "[expr $x+$dx] [expr $y+$dy]"
}
set nextPtNum [expr $ptNum+1]
# there should only be one such item:
set lineB [$w.zinc find withtag "line$bezierNum && l$ptNum-$nextPtNum"]
if {$lineB!=""} {
set x [lindex [$w.zinc coords $lineB 0 0] 0]
set y [lindex [$w.zinc coords $lineB 0 0] 1]
$w.zinc coords $lineB 0 0 "[expr $x+$dx] [expr $y+$dy]"
}
set tab [$w.zinc coords "bezier$bezierNum" 0 [expr $ptNum-1]]
set x [lindex $tab 0]
set y [lindex $tab 1]
set control [lindex $tab 2]
$w.zinc coords "bezier$bezierNum" 0 [expr $ptNum-1] "[expr $x+$dx] [expr $y+$dy] $control"
setText "bezier$bezierNum"
}
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