Import of Empire 4.2.12

src/lib/common/tfact.c

@@ -0,0 +1,89 @@
+/*
+ *  Empire - A multi-player, client/server Internet based war game.
+ *  Copyright (C) 1986-2000, Dave Pare, Jeff Bailey, Thomas Ruschak,
+ *                           Ken Stevens, Steve McClure
+ *
+ *  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
+ *
+ *  ---
+ *
+ *  See the "LEGAL", "LICENSE", "CREDITS" and "README" files for all the
+ *  related information and legal notices. It is expected that any future
+ *  projects/authors will amend these files as needed.
+ *
+ *  ---
+ *
+ *  tfact.c: return tech fact given multiplier
+ * 
+ *  Known contributors to this file:
+ *     Yannick Trembley
+ */
+
+#include "misc.h"
+#include "nat.h"
+#include "file.h"
+
+extern float fire_range_factor;
+
+double
+tfact(natid cn, double mult)
+{
+	double	tlev;
+	struct	natstr *np;
+
+	np = getnatp(cn);
+	tlev = np->nat_level[NAT_TLEV];
+	tlev = (50.0 + tlev) / (200.0 + tlev);
+	return mult * tlev;
+}
+
+double
+tfactfire(natid cn, double mult)
+{
+	double	tlev;
+	struct	natstr *np;
+
+	np = getnatp(cn);
+	tlev = np->nat_level[NAT_TLEV];
+	tlev = (50.0 + tlev) / (200.0 + tlev);
+	return mult * tlev * fire_range_factor;
+}
+
+double
+techfact(int level, double mult)
+{
+	return mult * ((50.0 + level) / (200.0 + level));
+}
+
+/*
+ * added so that firing range can be different to other ranges
+ */ 
+double
+techfactfire(int level, double mult)
+{
+	return mult * ((50.0 + level) / (200.0 + level)) * fire_range_factor;
+}
+
+/*
+ * figure out relative difference between two tech levels
+ */
+double
+reltech(int level1, int level2, double mult)
+{
+	int	diff;
+
+	diff = level1 - level2;
+	return (1.0 + ((diff + 50.0) / (level1 + 50.0))) * mult;
+}