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# $Id: photoAlpha.tcl 1826 2006-10-18 11:58:23Z lecoanet $
# this simple demo has been developped by P.Lecoanet <lecoanet@cena.fr>
if {![info exists zincDemo]} {
error "This script should be run from the zinc-widget demo."
}
namespace eval photoAlpha {
package require Img
variable girl [image create photo -file [file join $::zinc_demos images photoAlpha.png]]
variable texture [image create photo -file [file join $::zinc_demos images stripped_texture.gif]]
variable w .photoAlpha
catch {destroy $w}
toplevel $w
wm title $w "Zinc photo transparency Demonstration"
wm iconname $w photoAlpha
variable defaultfont [font create -family Helvetica -size 16 -weight normal]
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
###########################################
# Text zone
#######################
####################
grid [text $w.text -relief sunken -borderwidth 2 -height 7] \
-row 0 -column 0 -columnspan 2 -sticky ew
$w.text insert end {This demo needs openGL for displaying the photo
with transparent pixels and for rescaling/rotating.
You can transform this png photo with your mouse:
Drag-Button 1 for moving the photo,
Drag-Button 2 for zooming the photo,
Drag-Button 3 for rotating the photo,
Shift-Drag-Button 1 for modifying the global photo transparency.}
###########################################
# Zinc
##########################################
zinc $w.zinc -width 350 -height 250 -render 1 -font $defaultfont \
-borderwidth 3 -relief sunken -tile $texture
grid $w.zinc -row 1 -column 0 -columnspan 2 -sticky news
grid columnconfigure $w 0 -weight 1
grid columnconfigure $w 1 -weight 1
grid rowconfigure $w 1 -weight 2
variable topGroup [$w.zinc add group 1]
variable girlItem [$w.zinc add icon $topGroup -image $girl \
-composescale 1 -composerotation 1]
#
# Controls for the window transform.
#
bind $w.zinc <ButtonPress-1> "::photoAlpha::press motion %x %y"
bind $w.zinc <ButtonRelease-1> ::photoAlpha::release
bind $w.zinc <ButtonPress-2> "::photoAlpha::press zoom %x %y"
bind $w.zinc <ButtonRelease-2> ::photoAlpha::release
bind $w.zinc <ButtonPress-3> "::photoAlpha::press mouseRotate %x %y"
bind $w.zinc <ButtonRelease-3> ::photoAlpha::release
#
# Controls for alpha and gradient
#
bind $w.zinc <Shift-ButtonPress-1> "::photoAlpha::press modifyAlpha %x %y"
bind $w.zinc <Shift-ButtonRelease-1> ::photoAlpha::release
variable curX 0
variable curY 0
variable curAngle 0
proc press {action x y} {
variable w
variable curAngle
variable curX
variable curY
set curX $x
set curY $y
set curAngle [expr atan2($y, $x)]
bind $w.zinc <Motion> "::photoAlpha::$action %x %y"
}
proc motion {x y} {
variable w
variable topGroup
variable curX
variable curY
foreach {x1 y1 x2 y2} [$w.zinc transform $topGroup \
[list $x $y $curX $curY]] break
$w.zinc translate $topGroup [expr $x1 - $x2] [expr $y1 - $y2]
set curX $x
set curY $y
}
proc zoom {x y} {
variable w
variable topGroup
variable curX
variable curY
if {$x > $curX} {
set maxX $x
} else {
set maxX $curX
}
if {$y > $curY} {
set maxY $y
} else {
set maxY $curY
}
if {($maxX == 0) || ($maxY == 0)} {
return;
}
set sx [expr 1.0 + (double($x - $curX) / $maxX)]
set sy [expr 1.0 + (double($y - $curY) / $maxY)]
$w.zinc scale $topGroup $sx $sx
set curX $x
set curY $y
}
proc mouseRotate {x y} {
variable w
variable curAngle
variable topGroup
set lAngle [expr atan2($y, $x)]
$w.zinc rotate $topGroup [expr $lAngle - $curAngle]
set curAngle $lAngle
}
proc release {} {
variable w
bind $w.zinc <Motion> {}
}
proc modifyAlpha {x y} {
variable w
variable topGroup
set xRate [expr double($x) / [$w.zinc cget -width]]
set xRate [expr ($xRate < 0) ? 0 : ($xRate > 1) ? 1 : $xRate]
set alpha [expr int($xRate * 100)]
$w.zinc itemconfigure $topGroup -alpha $alpha
}
}
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