1 files changed, 71 insertions, 0 deletions
diff --git a/src/lingot-complex.c b/src/lingot-complex.c
new file mode 100644
index 0000000..6bee5ef
--- /dev/null
+++ b/src/lingot-complex.c
@@ -0,0 +1,71 @@
+/*
+ * lingot, a musical instrument tuner.
+ *
+ * Copyright (C) 2004-2011  Ibán Cereijo Graña, Jairo Chapela Martínez.
+ *
+ * This file is part of lingot.
+ *
+ * lingot is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * lingot is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with lingot; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "lingot-complex.h"
+
+/**
+ * addition. All parameters are overlapables.
+ */
+void lingot_complex_add(LingotComplex* a, LingotComplex* b, LingotComplex* c) {
+	c->r = a->r + b->r;
+	c->i = a->i + b->i;
+}
+
+/**
+ * substraction. All parameters are overlapables.
+ */
+void lingot_complex_sub(LingotComplex* a, LingotComplex* b, LingotComplex* c) {
+	c->r = a->r - b->r;
+	c->i = a->i - b->i;
+}
+
+/**
+ * multiplication. All parameters are overlapables.
+ */
+void lingot_complex_mul(LingotComplex* a, LingotComplex* b, LingotComplex* c) {
+	if ((c != a) && (c != b)) {
+		c->r = a->r * b->r - a->i * b->i;
+		c->i = a->i * b->r + a->r * b->i;
+	} else {
+		LingotComplex r;
+		r.r = a->r * b->r - a->i * b->i;
+		r.i = a->i * b->r + a->r * b->i;
+		*c = r;
+	}
+}
+
+/**
+ * division. All parameters are overlapables.
+ */
+void lingot_complex_div(LingotComplex* a, LingotComplex* b, LingotComplex* c) {
+	FLT bm2 = b->r * b->r + b->i * b->i;
+
+	if ((c != a) && (c != b)) {
+		c->r = (a->r * b->r + a->i * b->i) / bm2;
+		c->i = (a->i * b->r - a->r * b->i) / bm2;
+	} else {
+		LingotComplex r;
+		r.r = (a->r * b->r + a->i * b->i) / bm2;
+		r.i = (a->i * b->r - a->r * b->i) / bm2;
+		*c = r;
+	}
+}