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<?xml version="1.0" encoding="UTF-8"?>
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<xsl:transform version="2.0"
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xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
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xmlns:math="http://www.w3.org/2005/xpath-functions/math"
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xmlns:xs="http://www.w3.org/2001/XMLSchema">
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<xsl:output method="xml" indent="yes" />
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<!-- Déclaration des variables initiales -->
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<xsl:variable name="initial-x" select="0"
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as="xs:double" />
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<xsl:variable name="initial-y" select="0"
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as="xs:double" />
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<xsl:variable name="initial-angle" select="0"
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as="xs:double" />
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<!-- Séquences pour stocker les états -->
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<xsl:variable name="x-values" select="()"
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as="xs:double*" />
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<xsl:variable name="y-values" select="()"
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as="xs:double*" />
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<xsl:variable name="angle-values"
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as="xs:double*" select="()" />
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<xsl:template match="/tortue">
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<xsl:processing-instruction name="xml-model">href="traceur.xsd"</xsl:processing-instruction>
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<traceur>
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<!-- Appel du template pour traiter les commandes
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avec les valeurs initiales des paramètres -->
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<xsl:call-template name="process-commands">
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<xsl:with-param name="commands"
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select="*" />
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<xsl:with-param name="x"
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select="$initial-x" />
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<xsl:with-param name="y"
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select="$initial-y" />
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<xsl:with-param name="angle"
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select="$initial-angle" />
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<xsl:with-param name="x-values"
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select="$x-values" />
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<xsl:with-param name="y-values"
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select="$y-values" />
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<xsl:with-param name="angle-values"
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select="$angle-values" />
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</xsl:call-template>
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</traceur>
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</xsl:template>
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<!-- Template récursif pour traiter les commandes individuelles -->
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<xsl:template
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name="process-commands">
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<xsl:param
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name="commands" />
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<xsl:param
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name="x" />
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<xsl:param
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name="y" />
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<xsl:param
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name="angle" />
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<xsl:param
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name="x-values" />
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<xsl:param
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name="y-values" />
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<xsl:param
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name="angle-values" />
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<!-- Si il reste des commandes à traiter -->
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<xsl:if test="$commands">
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<!-- Sélection de la première commande à traiter -->
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<xsl:variable name="current-command"
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select="$commands[1]" />
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<xsl:choose>
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<!-- Si la commande est une ligne -->
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<xsl:when test="local-name($current-command) = 'line'">
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<!-- Calcul de la distance à parcourir
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et conversion de l'angle en radians -->
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<xsl:variable name="distance"
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select="number($current-command)" />
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<xsl:variable name="radians"
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select="$angle * math:pi() div 180" />
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<xsl:variable name="new-x"
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select="$x + $distance * math:cos($radians)" />
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<xsl:variable name="new-y"
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select="$y + $distance * math:sin($radians)" />
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<!-- Création de l'élément LINETO
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avec les nouvelles coordonnées calculées -->
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<LINETO
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x="{format-number($new-x, '#.######')}"
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y="{format-number($new-y, '#.######')}" />
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<!-- Appel récursif du template avec la mise à jour
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des coordonnées et des commandes restantes -->
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<xsl:call-template
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name="process-commands">
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<xsl:with-param
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name="commands" select="$commands[position() > 1]" />
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<xsl:with-param
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name="x" select="$new-x" />
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<xsl:with-param
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name="y" select="$new-y" />
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<xsl:with-param
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name="angle" select="$angle" />
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<xsl:with-param
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name="x-values" select="$x-values" />
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<xsl:with-param
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name="y-values" select="$y-values" />
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<xsl:with-param
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name="angle-values" select="$angle-values" />
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</xsl:call-template>
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</xsl:when>
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<!-- Si la commande est un turn -->
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<xsl:when test="local-name($current-command) = 'turn'">
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<!-- Calcul du nouvel angle avec modulo 360 pour rester
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dans un cercle complet -->
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<xsl:variable name="new-angle"
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select="($angle + number($current-command)) mod 360" />
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<!-- Appel récursif du template sans changer de
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position mais en mettant à jour l'angle -->
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<xsl:call-template
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name="process-commands">
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<xsl:with-param name="commands"
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select="$commands[position() > 1]" />
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<xsl:with-param name="x"
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select="$x" />
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<xsl:with-param name="y"
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select="$y" />
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<xsl:with-param name="angle"
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select="$new-angle" />
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<xsl:with-param name="x-values"
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select="$x-values" />
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<xsl:with-param name="y-values"
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select="$y-values" />
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<xsl:with-param name="angle-values"
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select="$angle-values" />
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</xsl:call-template>
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</xsl:when>
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<!-- Si la commande est un MOVE -->
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<xsl:when test="local-name($current-command) = 'move'">
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<!-- Calcul de la distance à parcourir et conversion
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de l'angle en radians -->
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<xsl:variable name="distance"
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select="number($current-command)" />
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<xsl:variable name="radians"
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select="$angle * math:pi() div 180" />
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<xsl:variable name="new-x"
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select="$x + $distance * math:cos($radians)" />
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<xsl:variable name="new-y"
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select="$y + $distance * math:sin($radians)" />
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<!-- Création de l'élément MOVETO avec
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les nouvelles coordonnées calculées -->
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<MOVETO
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x="{format-number($new-x, '#.######')}"
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y="{format-number($new-y, '#.######')}" />
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2024-05-06 18:24:07 +02:00
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<!-- Appel récursif du template avec la mise à jour
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des coordonnées et des commandes restantes -->
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<xsl:call-template
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name="process-commands">
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<xsl:with-param name="commands"
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select="$commands[position() > 1]" />
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<xsl:with-param name="x"
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select="$new-x" />
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<xsl:with-param name="y"
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select="$new-y" />
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<xsl:with-param name="angle"
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select="$angle" />
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<xsl:with-param name="x-values"
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select="$x-values" />
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<xsl:with-param name="y-values"
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select="$y-values" />
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<xsl:with-param name="angle-values"
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select="$angle-values" />
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</xsl:call-template>
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</xsl:when>
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<!-- Si la commande est un store -->
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<xsl:when test="local-name($current-command) = 'store'">
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<xsl:variable name="new-x-values"
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select="($x-values, $x)" />
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<xsl:variable name="new-y-values"
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select="($y-values, $y)" />
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<xsl:variable name="new-angle-values"
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select="($angle-values, $angle)" />
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<!-- Appel récursif -->
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<xsl:call-template name="process-commands">
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<xsl:with-param name="commands"
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select="$commands[position() > 1]" />
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<xsl:with-param name="x"
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select="$x" />
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<xsl:with-param name="y"
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select="$y" />
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<xsl:with-param name="angle"
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select="$angle" />
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<xsl:with-param name="x-values"
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select="$new-x-values" />
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<xsl:with-param name="y-values"
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select="$new-y-values" />
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<xsl:with-param name="angle-values"
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select="$new-angle-values" />
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</xsl:call-template>
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</xsl:when>
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<!-- Si la commande est un restore -->
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<xsl:when test="local-name($current-command) = 'restore' and count($x-values) > 0">
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<xsl:variable name="last-x"
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select="$x-values[last()]" />
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<xsl:variable name="last-y"
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select="$y-values[last()]" />
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<xsl:variable name="last-angle"
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select="$angle-values[last()]" />
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<!-- Création de l'élément MOVETO -->
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<MOVETO
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x="{format-number($last-x, '#.######')}"
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y="{format-number($last-y, '#.######')}" />
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2024-05-06 14:25:30 +02:00
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2024-05-06 14:35:12 +02:00
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<!-- Appel récursif -->
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<xsl:call-template
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name="process-commands">
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<xsl:with-param name="commands"
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select="$commands[position() > 1]" />
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<xsl:with-param name="x"
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select="$last-x" />
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<xsl:with-param name="y"
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select="$last-y" />
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<xsl:with-param name="angle"
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select="$last-angle" />
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<xsl:with-param name="x-values"
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select="subsequence($x-values, 1, count($x-values) - 1)" />
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<xsl:with-param name="y-values"
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select="subsequence($y-values, 1, count($y-values) - 1)" />
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<xsl:with-param name="angle-values"
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select="subsequence($angle-values, 1, count($angle-values) - 1)" />
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</xsl:call-template>
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</xsl:when>
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</xsl:choose>
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</xsl:if>
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</xsl:template>
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</xsl:transform>
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