Hello,

I'm trying to make a small template that concisely implements atan2, but
returns the values in degrees and handles the case where DX is zero.  So
far, I have:


	<xsl:template name="my_atan2">
		<xsl:param name="dx" />
		<xsl:param name="dy" />

		<xsl:variable name="rad" >
			<xsl:choose>
				<xsl:when test="dx != 0">
					<xsl:value-of select="exsl:atan2(dx,
dy)" />
				</xsl:when>

				<xsl:when test="(dx = 0) and (dy &gt; 0)">
				    <xsl:value-of select="$my_pi" />
				</xsl:when>

				<xsl:when test="(dx = 0) and (dy &lt; 0)">
				    <xsl:value-of select="$my_pi * 3" />
				</xsl:when>
			</xsl:choose>
		</xsl:variable>

		<xsl:choose>
			<xsl:when test="$rad &lt; 0">
				<xsl:value-of select="($rad * 180 div
$my_pi) + 360" />
			</xsl:when>

			<xsl:otherwise>
				<xsl:value-of select="($rad * 180 div
$my_pi)" />
			</xsl:otherwise>
		</xsl:choose>
	</xsl:template>


Is there a way to express this in only a few lines without all the
verbosity?