Added note about GUI architecture to doc/hacking.txt + doc/img/gui_flow/.

[hooke.git] / doc / img / gui_flow / math.sqrt.template.xsl

diff --git a/doc/img/gui_flow/math.sqrt.template.xsl b/doc/img/gui_flow/math.sqrt.template.xsl
new file mode 100644 (file)
index 0000000..00196eb
--- /dev/null
+++ b/doc/img/gui_flow/math.sqrt.template.xsl
@@ -0,0 +1,37 @@
+<?xml version="1.0"?>\r
+<!-- http://www.exslt.org/math/functions/sqrt/math.sqrt.template.xsl -->\r
+<xsl:stylesheet version="1.0"\r
+                xmlns:xsl="http://www.w3.org/1999/XSL/Transform"\r
+                xmlns:math="http://exslt.org/math"\r
+                extension-element-prefixes="math">\r
+\r
+<xsl:template name="sqrt">\r
+  <!-- The number you want to find the square root of -->\r
+  <xsl:param name="number" select="0" />  \r
+  <!-- The current 'try'.  This is used internally. -->\r
+  <xsl:param name="try" select="1" />\r
+  <!-- The current iteration, checked against maxiter to limit loop count -->  \r
+  <xsl:param name="iter" select="1" />\r
+  <!-- Set this up to ensure against infinite loops -->\r
+  <xsl:param name="maxiter" select="10" />\r
+\r
+  <!-- This template was written by Nate Austin using Sir Isaac Newton's\r
+       method of finding roots -->\r
+\r
+  <xsl:choose>\r
+    <xsl:when test="$try * $try = $number or $iter > $maxiter">\r
+      <xsl:value-of select="$try"/>\r
+    </xsl:when>\r
+    <xsl:otherwise>\r
+      <xsl:call-template name="sqrt">\r
+        <xsl:with-param name="number" select="$number"/>\r
+        <xsl:with-param name="try" \r
+                        select="$try - (($try * $try - $number) div (2 * $try))"/>\r
+        <xsl:with-param name="iter" select="$iter + 1"/>\r
+        <xsl:with-param name="maxiter" select="$maxiter"/>\r
+      </xsl:call-template>\r
+    </xsl:otherwise>\r
+  </xsl:choose>\r
+</xsl:template>\r
+\r
+</xsl:stylesheet>\r