X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~yarrgweb/git?p=ypp-sc-tools.web-live.git;a=blobdiff_plain;f=yarrg%2Frsvalue.c;h=b469378303de295f3c12d17b20cc9b65f44ac772;hp=22b3d2988f89c857196509f83b14678df629073d;hb=ef3dad0114d29a0c300eea4a8e1cf6d8e6e68453;hpb=b0df3bd887cce71fdbd60332b89db0a076b1ee4e

diff --git a/yarrg/rsvalue.c b/yarrg/rsvalue.c
index 22b3d29..b469378 100644
--- a/yarrg/rsvalue.c
+++ b/yarrg/rsvalue.c
@@ -1,4 +1,29 @@
-/**/
+/*
+ * Route searcher - route evaluation
+ */
+/*
+ *  This is part of the YARRG website, a tool for assisting
+ *  players of Yohoho Puzzle Pirates.
+ * 
+ *  Copyright (C) 2009 Ian Jackson <ijackson@chiark.greenend.org.uk>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as
+ *  published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
+ *  
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *  
+ *  Yohoho and Puzzle Pirates are probably trademarks of Three Rings and
+ *  are used without permission.  This program is not endorsed or
+ *  sponsored by Three Rings.
+ */
 
 #include <glpk.h>
 
@@ -62,18 +87,22 @@ static void add_constraint(int row, double coefficient) {
   constraint_coeffs[nconstraint_rows]= coefficient;
 }
 
-static void avail_c(const Trade *t, IslandTradeEnd **trades,
-		    int price, const char *srcdst,
-		    int islandid, sqlite3_stmt *ss_ite) {
-  /* find row number of trade availability constraint */
+static IslandTradeEnd *get_ite(const Trade *t, IslandTradeEnd **trades,
+			       int price) {
   IslandTradeEnd *search;
-
+  
   for (search= *trades; search; search=search->next)
     if (search->commodid==t->commodid && search->price==price)
-      goto found;
+      return search;
   abort();
-  
- found:;
+}
+
+static void avail_c(const Trade *t, IslandTradeEnd *ite,
+		    int price, const char *srcdst,
+		    int islandid, sqlite3_stmt *ss_ite) {
+  /* find row number of trade availability constraint */
+  IslandTradeEnd *search= ite;
+
   if (search->generation != generation) {
     search->rownum= lpx_add_rows(lp, 1);
     lpx_set_row_bnds(lp, search->rownum, LPX_UP, 0, search->qty);
@@ -255,10 +284,22 @@ double value_route(int nislands, const int *islands, int exclude_arbitrage) {
 	  debugf("  TRADE i%d#%d..i%d#%d c%d %d-%d  ",
 		 si,s, di,d, t->commodid, t->src_price, t->dst_price);
 
+	  IslandTradeEnd
+	    *src_ite= get_ite(t, &itradeends[si].src, t->src_price),
+	    *dst_ite= get_ite(t, &itradeends[di].dst, t->dst_price);
+
+	  int qty= src_ite->qty < dst_ite->qty ? src_ite->qty : dst_ite->qty;
+	  int maxprofit= qty * (t->dst_price - t->src_price);
+	  debugf("maxprofit=%d ",maxprofit);
+	  if (maxprofit < min_trade_maxprofit) {
+	    debugf("trivial\n");
+	    continue;
+	  }
+
 	  nconstraint_rows=0;
 
-	  avail_c(t, &itradeends[si].src, t->src_price, "src", si,ss_ite_sell);
-	  avail_c(t, &itradeends[di].dst, t->dst_price, "dst", di,ss_ite_buy);
+	  avail_c(t, src_ite, t->src_price, "src", si,ss_ite_sell);
+	  avail_c(t, dst_ite, t->dst_price, "dst", di,ss_ite_buy);
 
 	  int leg;
 	  for (leg=s; leg<d; leg++) {