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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."
}
namespace eval contoursDemo {
variable w .contours
catch {destroy $w}
toplevel $w
wm title $w "Zinc Curve contours Demonstration"
wm iconname $w Curve
grid [button $w.dismiss -text Dismiss -command "destroy $w"] -row 2 -column 0 -pady 10
grid [button $w.code -text "See Code" -command "showCode $w"] -row 2 -column 1 -pady 10
# The explanation displayed when running this demo
grid [text $w.text -relief sunken -borderwidth 2 -setgrid true -height 9] \
-row 0 -column 0 -columnspan 2 -sticky ew
$w.text insert end "All visibles items are made by combining 2 items using contours:
- the firebrick curve1 has been holed using a addhole with a circle,
- the lightblue curve2 has been mickey-moused by adding two circles,
- the yellow curve3 is the union with a disjoint circle,
- the grey curve4 is combined with 7 circles, with positive -fillrule.
The following operations are possible:
- Mouse Button 1 for dragging objects.
- Mouse Button 1 for dragging the black handle and
modifying the grey curve contour."
# Creating the zinc widget
grid [zinc $w.zinc -width 600 -height 500 -font 10x20 -borderwidth 3 \
-relief sunken] -row 1 -column 0 -columnspan 2 -sticky news
grid columnconfigure $w 0 -weight 1
grid columnconfigure $w 1 -weight 1
grid rowconfigure $w 1 -weight 2
variable top 1
# Creation of 2 items NOT visible, but used for creating visible
# curves[1-5] with more than one contours.
# The center of these 2 items is 200,100
variable curve0 [$w.zinc add curve $top {
{300 0} {400 100 c} {300 200} {200 300 c} {100 200} {0 100 c} {100 0}
} -closed 1 -visible 0 -filled 1]
variable cercle100 [$w.zinc add arc 1 {130 30 280 180} -visible 0]
# cloning curve0 as curve1 and moving it
variable curve1 [$w.zinc clone $curve0 -visible 1 -fillcolor firebrick1]
# adding a 'difference' contour to the curve1
$w.zinc contour $curve1 add 1 $cercle100
# cloning curve0 as curve2 and moving it
# creating a curve without contour to control contour clockwise/counterclockwise
variable curve2 [$w.zinc add curve $top {} -closed 1 -filled 1 \
-fillcolor lightblue2 -fillrule positive]
$w.zinc contour $curve2 add +1 $curve0
$w.zinc translate $curve2 100 90
# adding the left ear of mickey mouse!
$w.zinc contour $curve2 add +1 $cercle100
$w.zinc translate $curve2 -200 0
# adding the right ear of mickey mouse!
$w.zinc contour $curve2 add +1 $cercle100
# ... translate to make it more visible
$w.zinc translate $curve2 320 20
# cloning curve0 as curve3 and moving it
variable curve3 [$w.zinc clone $curve0 -visible 1 -fillcolor yellow3]
$w.zinc translate $curve3 0 290
# adding an nion' contour to the curve3
$w.zinc contour $curve3 add +1 $cercle100
# ... translate to make it more visible
$w.zinc translate $curve3 -130 0
# cloning curve0 as curve4 and moving it slightly
variable curve4 [$w.zinc clone $curve0 -visible 1 -fillcolor grey50 \
-tags grouped -fillrule positive]
# the tag "grouped" is used for both curve4 and
# a handle (see just below)
# It is used for translating both easily
variable index 2; ## index of the vertex associated to the handle
variable coord [$w.zinc coords $curve4 0 $index]
variable x [lindex $coord 0]
variable y [lindex $coord 1]
variable handle [$w.zinc add rectangle $top "[expr $x-5] [expr $y-5] [expr $x+5] [expr $y+5]" \
-fillcolor black -filled 1 -tags {grouped}]
# adding a 'difference' contour to the curve4
$w.zinc contour $curve4 add +1 $cercle100
$w.zinc translate grouped 110 0
$w.zinc contour $curve4 add +1 $cercle100
$w.zinc translate grouped -220 0
$w.zinc contour $curve4 add +1 $cercle100
$w.zinc translate grouped 10 80
$w.zinc contour $curve4 add -1 $cercle100
$w.zinc translate grouped 0 -10
$w.zinc contour $curve4 add +1 $cercle100
$w.zinc translate grouped 200 80
$w.zinc contour $curve4 add +1 $cercle100
$w.zinc translate grouped -350 0
$w.zinc contour $curve4 add +1 $cercle100
$w.zinc translate grouped 350 250
#$zinc->lower(grouped);
# Deleting no more usefull items: curve0 and cercle10:
$w.zinc remove $curve0 $cercle100
$w.zinc raise $curve1
# adding drag and drop callback to each visible curve!
foreach item "$curve1 $curve2 $curve3 $curve4" {
# Some bindings for dragging the items
$w.zinc bind $item <ButtonPress-1> "::contoursDemo::press $item motion %x %y"
$w.zinc bind $item <ButtonRelease-1> ::contoursDemo::release
}
# adding drag and drop on curve4 which also moves handle
$w.zinc bind $curve4 <ButtonPress-1> "::contoursDemo::press $curve4 motionWithHandle %x %y"
$w.zinc bind $curve4, <ButtonRelease-1> ::contoursDemo::release
# adding drag and drop on handle which also modify curve4
$w.zinc bind $handle <ButtonPress-1> "::contoursDemo::press $handle moveHandle %x %y"
$w.zinc bind $handle <ButtonRelease-1> ::contoursDemo::release
# callback for starting a drag
variable xOrig 0
variable yOrig 0
proc press {item action x y} {
variable w
variable xOrig
variable yOrig
set xOrig $x
set yOrig $y
bind $w.zinc <Motion> "::contoursDemo::$action $item %x %y"
}
# Callback for moving an item
proc motion {item x y} {
variable w
variable xOrig
variable yOrig
$w.zinc translate $item [expr $x - $xOrig] [expr $y - $yOrig]
set xOrig $x
set yOrig $y
}
# Callback for moving an item and its handle
proc motionWithHandle {item x y} {
variable w
variable xOrig
variable yOrig
set tag [lindex [$w.zinc itemcget $item -tags] 0]
$w.zinc translate $tag [expr $x-$xOrig] [expr $y-$yOrig]
set xOrig $x;
set yOrig $y;
}
# Callback for moving the handle and modifying curve4
# this code is far from being generic. Only for demonstrating how we can
# modify a contour with a unique handle!
proc moveHandle {handle x y} {
variable w
variable xOrig
variable yOrig
variable curve4
variable index
$w.zinc translate $handle [expr $x - $xOrig] [expr $y - $yOrig];
foreach {vertxX vertxY} [$w.zinc coords $curve4 0 $index] break
$w.zinc coords $curve4 0 $index "[expr $vertxX+($x-$xOrig)] [expr $vertxY+($y-$yOrig)]"
set xOrig $x
set yOrig $y
}
proc release {} {
variable w
bind $w.zinc <Motion> {}
}
}
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