Introduction dans la base

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diff --git a/demos/iconTransform.tcl b/demos/iconTransform.tcl
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+# $Id$
+# this simple demo has been developped by C. Mertz <mertz@cena.fr>
+# Ported to Tcl by P.Lecoanet
+
+if {![info exists zincDemo]} {
+    error "This script should be run from the zinc-widget demo."
+}
+
+
+set w .iconTransform
+catch {destroy $w}
+toplevel $w
+wm title $w "Zinc icon scale/rotate Demonstration"
+wm iconname $w zincTransform
+
+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 zone
+#######################
+####################
+
+text $w.text -relief sunken -borderwidth 2 -height 5
+pack $w.text -expand yes -fill both
+
+$w.text insert end {This demo needs openGL for rescaling/rotating the icon
+   You can transform this earth gif image with your mouse:
+     Drag-Button 1 for zooming the earth,
+     Drag-Button 2 for rotating the earth,
+     Drag-Button 3 for moving the earth,
+     Shift-Drag-Button 1 for modifying the earth transparency.}
+
+
+###########################################
+# Zinc
+##########################################
+zinc $w.zinc -width 350 -height 250 -render 1 -font 10x20 \
+    -borderwidth 3 -relief sunken
+pack $w.zinc
+
+set topGroup [$w.zinc add group 1]
+
+image create photo earth -file [file join $tk_library demos images earth.gif]
+
+set earth [$w.zinc add icon $topGroup -image earth \
+	       -composescale 1 -composerotation 1]
+
+$w.zinc add text $topGroup -connecteditem $earth \
+	       -text {try to zoom/resize the earth!} -color white \
+	       -composescale 1 -composerotation 1
+
+#
+# Controls for the window transform.
+#
+bind $w.zinc <ButtonPress-1>  "press motion %x %y"
+bind $w.zinc <ButtonRelease-1>  release
+bind $w.zinc <ButtonPress-2>  "press zoom %x %y"
+bind $w.zinc <ButtonRelease-2>  release
+
+#
+# Controls for alpha and gradient
+#
+bind $w.zinc <Shift-ButtonPress-1> "press modifyAlpha %x %y"
+bind $w.zinc <Shift-ButtonRelease-1> release
+
+
+set curX 0
+set curY 0
+set curAngle 0
+
+proc press {action x y} {
+    global w curAngle curX curY
+
+    set curX $x
+    set curY $y
+    set curAngle [expr atan2($y, $x)]
+    bind $w.zinc <Motion> "$action %x %y"
+}
+
+proc motion {x y} {
+    global w topGroup curX 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 $y
+}
+
+proc zoom {x y} {
+    global w topGroup curX curY
+
+    if {$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 $y
+}
+
+proc mouseRotate {x y} {
+    global w curAngle topGroup
+
+    set lAngle [expr atan2($y, $x)]
+    $w.zinc rotate $topGroup [expr -($lAngle - $curAngle)]
+    set curAngle  $lAngle
+}
+
+proc release {} {
+    global w
+
+    bind $w.zinc <Motion> {}
+}
+
+proc modifyAlpha {x y} {
+    global w
+
+    set xRate [expr double($x) / [$w.zinc cget -width]]
+    set xRate [expr ($xRate < 0) ? 0 : ($xRate > 1) ? 1 : $xRate]
+    set alpha [expr $xRate * 100]
+
+    $w.zinc itemconfigure $group -alpha $alpha
+}