From 4dceada8f4380913cfded94a845abf59a6a4d3ee Mon Sep 17 00:00:00 2001
From: kintel <kintel@b57f626f-c46c-0410-a088-ec61d464b74c>
Date: Fri, 9 Jul 2010 09:35:19 +0000
Subject: sign() function suggested by Dan Zuras and implemented by Giles
 Bathgate

git-svn-id: http://svn.clifford.at/openscad/trunk@568 b57f626f-c46c-0410-a088-ec61d464b74c

diff --git a/src/func.cc b/src/func.cc
index 9f1b8e7..eb0afcd 100644
--- a/src/func.cc
+++ b/src/func.cc
@@ -117,6 +117,13 @@ Value builtin_abs(const Context *, const QVector<QString>&, const QVector<Value>
 	return Value();
 }
 
+Value builtin_sign(const Context *, const QVector<QString>&, const QVector<Value> &args)
+{
+	if (args.size() == 1 && args[0].type == Value::NUMBER)
+		return Value((args[0].num<0) ? -1.0 : ((args[0].num>0) ? 1.0 : 0.0));
+	return Value();
+}
+
 Value builtin_min(const Context *, const QVector<QString>&, const QVector<Value> &args)
 {
 	if (args.size() >= 1 && args[0].type == Value::NUMBER) {
@@ -292,6 +299,7 @@ Value builtin_lookup(const Context *, const QVector<QString>&, const QVector<Val
 void initialize_builtin_functions()
 {
 	builtin_functions["abs"] = new BuiltinFunction(&builtin_abs);
+	builtin_functions["sign"] = new BuiltinFunction(&builtin_sign);
 	builtin_functions["min"] = new BuiltinFunction(&builtin_min);
 	builtin_functions["max"] = new BuiltinFunction(&builtin_max);
 	builtin_functions["sin"] = new BuiltinFunction(&builtin_sin);
-- 
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