1 files changed, 154 insertions, 0 deletions
diff --git a/src/uqm/trans.c b/src/uqm/trans.c
new file mode 100644
index 0000000..a6eb6d5
--- /dev/null
+++ b/src/uqm/trans.c
@@ -0,0 +1,154 @@
+//Copyright Paul Reiche, Fred Ford. 1992-2002
+
+/*
+ *  This program 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.
+ *
+ *  This program 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 this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include "units.h"
+#include "libs/compiler.h"
+
+
+SIZE sinetab[] =
+{
+	-FLT_ADJUST (1.000000),
+	-FLT_ADJUST (0.995185),
+	-FLT_ADJUST (0.980785),
+	-FLT_ADJUST (0.956940),
+	-FLT_ADJUST (0.923880),
+	-FLT_ADJUST (0.881921),
+	-FLT_ADJUST (0.831470),
+	-FLT_ADJUST (0.773010),
+	-FLT_ADJUST (0.707107),
+	-FLT_ADJUST (0.634393),
+	-FLT_ADJUST (0.555570),
+	-FLT_ADJUST (0.471397),
+	-FLT_ADJUST (0.382683),
+	-FLT_ADJUST (0.290285),
+	-FLT_ADJUST (0.195090),
+	-FLT_ADJUST (0.098017),
+	FLT_ADJUST (0.000000),
+	FLT_ADJUST (0.098017),
+	FLT_ADJUST (0.195090),
+	FLT_ADJUST (0.290285),
+	FLT_ADJUST (0.382683),
+	FLT_ADJUST (0.471397),
+	FLT_ADJUST (0.555570),
+	FLT_ADJUST (0.634393),
+	FLT_ADJUST (0.707107),
+	FLT_ADJUST (0.773010),
+	FLT_ADJUST (0.831470),
+	FLT_ADJUST (0.881921),
+	FLT_ADJUST (0.923880),
+	FLT_ADJUST (0.956940),
+	FLT_ADJUST (0.980785),
+	FLT_ADJUST (0.995185),
+	FLT_ADJUST (1.000000),
+	FLT_ADJUST (0.995185),
+	FLT_ADJUST (0.980785),
+	FLT_ADJUST (0.956940),
+	FLT_ADJUST (0.923880),
+	FLT_ADJUST (0.881921),
+	FLT_ADJUST (0.831470),
+	FLT_ADJUST (0.773010),
+	FLT_ADJUST (0.707107),
+	FLT_ADJUST (0.634393),
+	FLT_ADJUST (0.555570),
+	FLT_ADJUST (0.471397),
+	FLT_ADJUST (0.382683),
+	FLT_ADJUST (0.290285),
+	FLT_ADJUST (0.195090),
+	FLT_ADJUST (0.098017),
+	FLT_ADJUST (0.000000),
+	-FLT_ADJUST (0.098017),
+	-FLT_ADJUST (0.195090),
+	-FLT_ADJUST (0.290285),
+	-FLT_ADJUST (0.382683),
+	-FLT_ADJUST (0.471397),
+	-FLT_ADJUST (0.555570),
+	-FLT_ADJUST (0.634393),
+	-FLT_ADJUST (0.707107),
+	-FLT_ADJUST (0.773010),
+	-FLT_ADJUST (0.831470),
+	-FLT_ADJUST (0.881921),
+	-FLT_ADJUST (0.923880),
+	-FLT_ADJUST (0.956940),
+	-FLT_ADJUST (0.980785),
+	-FLT_ADJUST (0.995185),
+};
+
+COUNT
+ARCTAN (SIZE delta_x, SIZE delta_y)
+{
+	SIZE v1, v2;
+	static COUNT atantab[] =
+	{
+		0,
+		0,
+		1,
+		1,
+		1,
+		2,
+		2,
+		2,
+		2,
+		3,
+		3,
+		3,
+		4,
+		4,
+		4,
+		4,
+		5,
+		5,
+		5,
+		5,
+		6,
+		6,
+		6,
+		6,
+		7,
+		7,
+		7,
+		7,
+		7,
+		7,
+		8,
+		8,
+		8,
+	};
+
+	v1 = delta_x;
+	v2 = delta_y;
+	if (v1 == 0 && v2 == 0)
+		return (FULL_CIRCLE);
+
+	if (v1 < 0)
+		v1 = -v1;
+	if (v2 < 0)
+		v2 = -v2;
+	if (v1 > v2)
+		v1 = QUADRANT
+				- atantab[(((DWORD)v2 << (CIRCLE_SHIFT - 1)) + (v1 >> 1)) / v1];
+	else
+		v1 = atantab[(((DWORD)v1 << (CIRCLE_SHIFT - 1)) + (v2 >> 1)) / v2];
+
+	if (delta_x < 0)
+		v1 = FULL_CIRCLE - v1;
+	if (delta_y > 0)
+		v1 = HALF_CIRCLE - v1;
+
+	return (NORMALIZE_ANGLE (v1));
+}
+